Searching for lamella : 29 results found | RSS Feed for this search

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ? phase. Below about 930░C, Widmanstńtten ? phase precipitates. At the eutectoid temperature (565░C) the remaining ? decomposes to a lamellar eutectoid of ? and ?. Rapid cooling from the high temperature ? phase can form martensite instead of Widmanstńtten ?. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | ńtten | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ? phase. Below about 930░C, Widmanstńtten ? phase precipitates. At the eutectoid temperature (565░C) the remaining ? decomposes to a lamellar eutectoid of ? and ?. Rapid cooling from the high temperature ? phase can form martensite instead of Widmanstńtten ?. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | ńtten | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ? phase. Below about 930░C, Widmanstńtten ? phase precipitates. At the eutectoid temperature (565░C) the remaining ? decomposes to a lamellar eutectoid of ? and ?. Rapid cooling from the high temperature ? phase can form martensite instead of Widmanstńtten ?. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | ńtten | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ? phase. Below about 930░C, Widmanstńtten ? phase precipitates. At the eutectoid temperature (565░C) the remaining ? decomposes to a lamellar eutectoid of ? and ?. Rapid cooling from the high temperature ? phase can form martensite instead of Widmanstńtten ?. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | ńtten | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ? phase. Below about 930░C, Widmanstńtten ? phase precipitates. At the eutectoid temperature (565░C) the remaining ? decomposes to a lamellar eutectoid of ? and ?. Rapid cooling from the high temperature ? phase can form martensite instead of Widmanstńtten ?. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | ńtten | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Al 75, Cu 25 (wt%), hypoeutectic alloy

Description

The micrograph shows primary Al dendrite arms (white). The dendrite trunk has been intersected at an angle by the plane of polishing to give the observed morphology. Between the dendrites is the Al - CuAl2 eutectic. Initially dendrites would have formed from the liquid, the regions between the dendrite arms known as the mushy zone transforming to a eutectic solid (L to Al + CuAl2). These two phases form cooperatively as neighbouring lamellae with the lateral diffusion of material across the growing interface. The relative amounts of the two phases (Al and CuAl2 ) within the eutectic are determined by applying the Lever Rule at the eutectic temperature.

Subjects

alloy | aluminium | copper | dendrite | hypoeutectic | lamella | metal | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

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Al 75, Cu 25 (wt%), hypoeutectic alloy

Description

This is a secondary electron micrograph of the hypereuctectic alloy showing the Al dendrites and the Al-CuAl2 eutectic in greater detail. It is clear that the lamellar eutectic has been significantly distorted by the presence of the primary Al dendrites. Around the dendrites there is a layer of CuAl2.

Subjects

alloy | bismuth | cadmium | eutectic | lamella | metal | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

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Al 67, Cu 33 (wt%), eutectic alloy

Description

This alloy is of the eutectic composition and has solidified with a lamellae eutectic structure. The Al and ╬Ş phases form co-operatively. The eutectic lamellae grows in the principal direction of heat flow; the lamellae structure is stabilised by the high temperature gradient. In the lower part of the micrograph the lamellae structure breaks down.

Subjects

alloy | aluminium | copper | eutectic | lamella | metal | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al 67, Cu 33 (wt%), eutectic alloy

Description

This SEM image shows the lamellar eutectic very clearly. The interlamellar spacing is about one micron. There are several imperfections in the lamellar structure, which have arisen from irregularities and disturbances during growth.

Subjects

alloy | aluminium | copper | eutectic | lamella | metal | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Bi 60, Cd 40 (wt%), eutectic alloy

Description

This sample has the eutectic composition so all the liquid solidifies at the eutectic temperature to form a lamellar eutectic structure. The two phases grow co-operatively from the melt.

Subjects

alloy | bismuth | cadmium | eutectic | lamella | metal | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Bi 60, Cd 40 (wt%), eutectic alloy

Description

This sample has the eutectic composition so all the liquid solidifies at the eutectic temperature to form a lamellar eutectic structure. The two phases grow co-operatively from the melt.

Subjects

alloy | bismuth | cadmium | eutectic | lamella | metal | test | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Fe, C 0.8 (wt%), eutectoid transformation - pearlite (coarse)

Description

This steel is of the eutectoid composition. Once the temperature is lowered below the eutectoid temperature the steel becomes simultaneously supersaturated with both ferrite and cementite. A eutectoid transformation results (╬│ to ╬▒ + Fe3C). The resultant microstructure, known as pearlite, comprises lamellae of cementite (dark) embedded in ferrite (white). The platelets are parallel to each other and do not follow a specific crystallographic direction.Each pearlite colony is made up of a number of subgrains. Thus each pearlite colony consists of two interpenetrating single crystals having an orientation relationship with respect to each other and with respect to the austenite grain they grow from, but not with respect to the austenite grain they have grown into. Changes in the apparent in

Subjects

alloy | austenite | carbon | cementite | eutectoid reaction | ferrite | iron | lamella | metal | pearlite | steel | supercooling | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Fe, C 0.8 (wt%), eutectoid transformation - pearlite (coarse)

Description

This steel is of the eutectoid composition. Once the temperature is lowered below the eutectoid temperature the steel becomes simultaneously supersaturated with both ferrite and cementite. A eutectoid transformation results (╬│ to ╬▒ + Fe3C). The resultant microstructure, known as pearlite, comprises lamellae of cementite (dark) embedded in ferrite (white). The platelets are parallel to each other and do not follow a specific crystallographic direction.Each pearlite colony is made up of a number of subgrains. Thus each pearlite colony consists of two interpenetrating single crystals having an orientation relationship with respect to each other and with respect to the austenite grain they grow from, but not with respect to the austenite grain they have grown into. Changes in the apparent in

Subjects

alloy | austenite | carbon | cementite | eutectoid reaction | ferrite | iron | lamella | metal | pearlite | steel | supercooling | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Fe, C 0.8 (wt%), eutectoid transformation - pearlite (coarse)

Description

This steel is of the eutectoid composition. Once the temperature is lowered below the eutectoid temperature the steel becomes simultaneously supersaturated with both ferrite and cementite. A eutectoid transformation results (╬│ to ╬▒ + Fe3C). The resultant microstructure, known as pearlite, comprises lamellae of cementite (dark) embedded in ferrite (white). The platelets are parallel to each other and do not follow a specific crystallographic direction. Each pearlite colony is made up of a number of subgrains. Thus each pearlite colony consists of two interpenetrating single crystals having an orientation relationship with respect to each other and with respect to the austenite grain they grow from, but not with respect to the austenite grain they have grown into. Changes in the apparent i

Subjects

alloy | austenite | carbon | cementite | eutectoid reaction | ferrite | iron | lamella | metal | pearlite | steel | supercooling | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ╬▓ phase. Below about 930┬░C, Widmanst├Ątten ╬▒ phase precipitates. At the eutectoid temperature (565┬░C) the remaining ╬▓ decomposes to a lamellar eutectoid of ╬▒ and ╬▓. Rapid cooling from the high temperature ╬▓ phase can form martensite instead of Widmanst├Ątten ╬▒. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400┬░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | widmanst├â┬Ątten | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ╬▓ phase. Below about 930┬░C, Widmanst├Ątten ╬▒ phase precipitates. At the eutectoid temperature (565┬░C) the remaining ╬▓ decomposes to a lamellar eutectoid of ╬▒ and ╬▓. Rapid cooling from the high temperature ╬▓ phase can form martensite instead of Widmanst├Ątten ╬▒. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400┬░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | widmanst├â┬Ątten | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ╬▓ phase. Below about 930┬░C, Widmanst├Ątten ╬▒ phase precipitates. At the eutectoid temperature (565┬░C) the remaining ╬▓ decomposes to a lamellar eutectoid of ╬▒ and ╬▓. Rapid cooling from the high temperature ╬▓ phase can form martensite instead of Widmanst├Ątten ╬▒. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400┬░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | widmanst├â┬Ątten | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ╬▓ phase. Below about 930┬░C, Widmanst├Ątten ╬▒ phase precipitates. At the eutectoid temperature (565┬░C) the remaining ╬▓ decomposes to a lamellar eutectoid of ╬▒ and ╬▓. Rapid cooling from the high temperature ╬▓ phase can form martensite instead of Widmanst├Ątten ╬▒. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400┬░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | widmanst├â┬Ątten | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Al-90 wt% Cu (bronze)

Description

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the ╬▓ phase. Below about 930┬░C, Widmanst├Ątten ╬▒ phase precipitates. At the eutectoid temperature (565┬░C) the remaining ╬▓ decomposes to a lamellar eutectoid of ╬▒ and ╬▓. Rapid cooling from the high temperature ╬▓ phase can form martensite instead of Widmanst├Ątten ╬▒. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400┬░C). Typical applications include bearings, gears and corrosion resistant vessels.

Subjects

alloy | aluminium | bronze | copper | corrosion resistance | lamella | martensite | metal | widmanst├â┬Ątten | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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Particle technology : hindered systems and thickening

Description

This open educational resource was released through the Higher Education Academy Engineering Subject Centre Open Engineering Resources Pilot project. The project was funded by HEFCE and the JISC/HE Academy UKOER programme.

Subjects

ukoer | engscoer | cc-by | engcetl | loughborough university | higher education | learning | loughboroughunioer | engineering | richard holdich | particles | particle technology | bsc | beng | meng | msc | thickeners | thickener design | flux | buoyancy | viscosity | krieger equation | richardson and zaki | zone settling | kynch | coe and clevenger | lamella settler | sedimentation | Engineering | H000

License

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Al 75, Cu 25 (wt%), hypoeutectic alloy

Description

The micrograph shows primary Al dendrite arms (white). The dendrite trunk has been intersected at an angle by the plane of polishing to give the observed morphology. Between the dendrites is the Al - CuAl2 eutectic. Initially dendrites would have formed from the liquid, the regions between the dendrite arms known as the mushy zone transforming to a eutectic solid (L to Al + CuAl2). These two phases form cooperatively as neighbouring lamellae with the lateral diffusion of material across the growing interface. The relative amounts of the two phases (Al and CuAl2 ) within the eutectic are determined by applying the Lever Rule at the eutectic temperature.

Subjects

alloy | aluminium | copper | dendrite | hypoeutectic | lamella | metal | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Al 75, Cu 25 (wt%), hypoeutectic alloy

Description

This is a secondary electron micrograph of the hypereuctectic alloy showing the Al dendrites and the Al-CuAl2 eutectic in greater detail. It is clear that the lamellar eutectic has been significantly distorted by the presence of the primary Al dendrites. Around the dendrites there is a layer of CuAl2.

Subjects

alloy | bismuth | cadmium | eutectic | lamella | metal | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Al 67, Cu 33 (wt%), eutectic alloy

Description

This alloy is of the eutectic composition and has solidified with a lamellae eutectic structure. The Al and ? phases form co-operatively. The eutectic lamellae grows in the principal direction of heat flow; the lamellae structure is stabilised by the high temperature gradient. In the lower part of the micrograph the lamellae structure breaks down.

Subjects

alloy | aluminium | copper | eutectic | lamella | metal | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Al 67, Cu 33 (wt%), eutectic alloy

Description

This SEM image shows the lamellar eutectic very clearly. The interlamellar spacing is about one micron. There are several imperfections in the lamellar structure, which have arisen from irregularities and disturbances during growth.

Subjects

alloy | aluminium | copper | eutectic | lamella | metal | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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Bi 60, Cd 40 (wt%), eutectic alloy

Description

This sample has the eutectic composition so all the liquid solidifies at the eutectic temperature to form a lamellar eutectic structure. The two phases grow co-operatively from the melt.

Subjects

alloy | bismuth | cadmium | eutectic | lamella | metal | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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