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Facetted aluminium dendrites

Description

In this system, pro-eutectic aluminium dendrites form with facetted morphologies. Such morphologies are uncommon but are a consequence of the diluteness of the aluminium in the melt. The rest of the melt has solidified as a fine Al-Sn eutectic.

Subjects

alloy | aluminium | dendrite | eutectic | facet | facetted dendrite | metal | tin | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

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Facetted aluminium dendrites

Description

In this system, pro-eutectic aluminium dendrites form with facetted morphologies. Such morphologies are uncommon but are a consequence of the diluteness of the aluminium in the melt. The rest of the melt has solidified as a fine Al-Sn eutectic.

Subjects

alloy | aluminium | dendrite | eutectic | facet | facetted dendrite | metal | tin | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Cu 65, Zn 35 (wt%) B4 brass, chill cast

Description

An good example of dendritic solidification, which occurs when the solidification front becomes unstable with respect to small perturbations. This results in the growth of the perturbations, producing dendrites (from the Greek for tree). Interdendritic β phase and purple-grey ZnO inclusions.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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 95, Cu 5 (wt%), microsegregation - cored dendrites

Description

This sample shows kappa-Al dendrites surrounded by a fine eutectic in which the two phases, kappa and ? (Al

Subjects

alloy | aluminium | copper | coring | dendrite | metal | microsegregation | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Al 95, Cu 5 (wt%), microsegregation - cored dendrites

Description

This sample shows kappa-Al dendrites surrounded by a fine eutectic in which the two phases, kappa and ? (Al

Subjects

alloy | aluminium | copper | coring | dendrite | metal | microsegregation | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Cu 50, Zn 50 (wt%) brass, as cast

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 50, Zn 50 (wt%) brass, as cast

Description

The centre of a cast brass sample showing the equiaxed zone where nucleation has occurred ahead of the solidification front.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 50, Zn 50 (wt%) brass, as cast

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 50, Zn 50 (wt%) brass, as cast

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Atomic Structure and Microstructure of Materials: Solidification of Alloys

Description

This set of animations covers different aspects of solidification, it includes interactive phase diagrams. From TLP: Solidification of Alloys

Subjects

solidification | solute | partitioning | steady state | undercooling | dendrites | schiel | phase diagram | DoITPoMS | University of Cambridge | animation | corematerials | ukoer

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Cu 80, Zn 20 (wt%) brass, exhibiting dendritic solidification

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 80, Zn 20 (wt%) brass, exhibiting dendritic solidification

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 80, Zn 20 (wt%) brass, exhibiting dendritic solidification

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 80, Zn 20 (wt%) brass, exhibiting dendritic solidification

Description

As cast copper rich brass showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | brass | copper | dendrite | metal | zinc | 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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Cu 80, Sn 20 (wt%) bronze, as cast

Description

As cast copper rich bronze showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | bronze | copper | dendrite | metal | zinc | 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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Hypoeutectic white cast iron

Description

With a carbon equivalent less than the eutectic composition a hypoeutectic white cast iron is formed. Primary austenite dendrites (dark) are first to form from the liquid. At the eutectic the remaining liquid transforms to a mixture of austenite and cementite (light) with further transformation of the austenite to ferrite and pearlite.

Subjects

alloy | austenite | cast iron | cementite | dendrite | ferrite | hypoeutectic | iron | metal | pearlite | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Cu 80, Sn 20 (wt%) bronze, as cast

Description

As cast copper rich bronze showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | bronze | copper | dendrite | metal | zinc | 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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Hypoeutectic white cast iron

Description

With a carbon equivalent less than the eutectic composition a hypoeutectic white cast iron is formed. Primary austenite dendrites (dark) are first to form from the liquid. At the eutectic the remaining liquid transforms to a mixture of austenite and cementite (light) with further transformation of the austenite to ferrite and pearlite.

Subjects

alloy | austenite | cast iron | cementite | dendrite | ferrite | hypoeutectic | iron | metal | pearlite | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Cu 80, Sn 20 (wt%) bronze, as cast

Description

As cast copper rich bronze showing copper dendrites in a matrix of α (copper) and β phases.

Subjects

alloy | bronze | copper | dendrite | metal | zinc | 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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Cu 80, Sn 20 (wt%) bronze, exhibiting dendritic solidification

Description

An good example of dendritic solidification, which occurs when the solidification front becomes unstable with respect to small perturbations. This results in the growth of the perturbations, producing dendrites (from the Greek for tree) of the primary phase. Subsequently the secondary phase forms between in the enriched melt between the dendrites.

Subjects

alloy | bronze | copper | dendrite | metal | tin | 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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Cu 80, Sn 20 (wt%) bronze, exhibiting dendritic solidification

Description

An good example of dendritic solidification, which occurs when the solidification front becomes unstable with respect to small perturbations. This results in the growth of the perturbations, producing dendrites (from the Greek for tree) of the primary phase. Subsequently the secondary phase forms between in the enriched melt between the dendrites.

Subjects

alloy | bronze | copper | dendrite | metal | tin | 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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Silal

Description

This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite with interdendritic flake graphite. A few white areas of Si carbide are also present.

Subjects

alloy | dendrite | ferrite | graphite | iron | metal | silal | silicon | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Cu 80, Sn 20 (wt%) bronze, exhibiting dendritic solidification

Description

An good example of dendritic solidification, which occurs when the solidification front becomes unstable with respect to small perturbations. This results in the growth of the perturbations, producing dendrites (from the Greek for tree) of the primary phase. Subsequently the secondary phase forms between in the enriched melt between the dendrites.

Subjects

alloy | bronze | copper | dendrite | metal | tin | 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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Silal

Description

This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite with interdendritic flake graphite. A few white areas of Si carbide are also present.

Subjects

alloy | dendrite | ferrite | graphite | iron | metal | silal | silicon | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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Ni-hard iron

Description

This is a Ni-hard iron, one of the first cast irons to be developed. These white irons contain Ni to ensure that the austenite transforms to martensite following heating and chromium to increase the hardness of the eutectic carbide.Ni-hard irons are normally stress relieved at 200-300 C for approximately four hours to relieve the martensitic transformation stresses and to promote the transformation of retained austenite. The structure consists of proeutectic austenite dendrites containing martensitic needles with interdendritic austenite-martensite/carbide eutectic.

Subjects

alloy | cast iron | dendrite | iron | metal | nickel | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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