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Wrought-grade aluminium alloy

Description

The micrograph shows Al-Mg-Fe-Si containing < 1wt.% of each solute; refined with TiB2 particles. Deformation of grain structure is due to cutting of sample with scissors. This micrograph illustrates the effect of deformation on a previously equiaxed structure. Strain causes the elongation of grains and the subsequent anodising produces 'mottled' grain colours; the oxide layer is not of constant orientation or thickness across a grain.The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation and oxide thickness; hence the grain structure is imaged.

Subjects

alloy | aluminium | anodising | deformation | equiaxed | iron | magnesium | metal | silicon | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

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As-cast wrought-grade aluminium alloy

Description

The micrograph shows Al-Mg-Fe-Si containing < 1wt.% of each solute. No addition of grain refinement particles (e.g. TiB2). This micrograph illustrates one of the possible growth morphologies that a solidifying metal can adopt (c.f. micrograph 712). The dendritic structure is the result of instabilities in the solid-liquid interface during growth due to the rejection of solute into the liquid phase. Dendritic grains are more prevalent in alloys of high solute content and larger grain sizes.The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation and oxide thickness; hence the grain structure is imaged.

Subjects

alloy | aluminium | anodising | dendrite | equiaxed | iron | magnesium | metal | silicon | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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As-cast wrought-grade aluminium alloy

Description

The micrograph shows Al-Mg-Fe-Si containing < 1wt.% of each solute. Addition of TiB2 particles facilitates the formation of a fine, equiaxed grain structure (grain refinement). This micrograph illustrates one of the possible growth morphologies that a solidifying metal can adopt (c.f. micrograph 711). The grains in this structure exhibit no dendritic branching, i.e. the solid-liquid interfaces of the growing grains are smooth. When a solid grain is growing from the liquid phase, it will initially exhibit a smooth interface; such an interface can become unstable as the grain becomes larger due to rejection of solute into the liquid phase. Hence, smooth grain boundaries are associated with fine grain structures and low solute contents. The Barker's etch and applied electrical field produce

Subjects

alloy | aluminium | anodising | dendrite | equiaxed | iron | magnesium | metal | silicon | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

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

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TALAT Lecture 1202: Metallography of Aluminium Alloys

Description

This lecture aims at providing a survey of the metallographic techniques available for the examination of aluminium and its alloys. The information must be sufficient to be sure that the students and the users are able to choose the most suitable technique to solve their problems in the examination of samples. The lecture should contain a direct understanding of the main problems in the metallography of the different classes of aluminium materials.

Subjects

aluminium | aluminum | european aluminium association | EAA | Training in Aluminium Application Technologies | training | metallurgy | technology | lecture | metallography | sample preparation | grinding | polishing | etching | anodising | electropolishing | dimpling | ion milling | polarised light | electron channelling | interference contrast | high resolution electron microscopy | SEM | TEM | HREM | HVEM | optical microscopy | high voltage electron microscopy | commercial purity | wrought alloys | foundry alloys | corematerials | ukoer

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TALAT Lecture 1252: Corrosion and Corrosion Protection

Description

This lecture outlines the metallurgical principles of corrosion and corrosion protection of aluminium alloys. Basic knowledge of physics and chemistry and some familiarity with TALAT lectures 1201 through 1205 is assumed.

Subjects

aluminium | aluminum | european aluminium association | EAA | Training in Aluminium Application Technologies | training | metallurgy | technology | lecture | corrosion | crevice corrosion | poultice corrosion | fretting corrosion | stress corrosion | galvanic corrosion | pitting corrosion | intergranular corrosion | exfoliation | kinetic reactivity | electrochemical circuit | electrolytic corrosion | corrosion protection | anodising | chemical conversion coatings | corematerials | ukoer

License

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TALAT Lecture 5105: Surface Treatment of Aluminium

Description

This lecture helps to understand the general principles, methods, properties and applications of plating on aluminium. Some knowledge in general electrochemistry is assumed.

Subjects

aluminium | aluminum | european aluminium association | eaa | talat | training in aluminium application technologies | training | metallurgy | technology | lecture | surface treatment | non-galvanic methods | mechanical finishes | organic finishes | chemical methods | pickling | etching | chemical polishing | chemical conversion coating | electroless plating | autocatalytic plating | ion-exchange plating | electrolytic methods | electropolishing | electroplating | platable metals | anodising | 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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TALAT Lecture 5105: Surface Treatment of Aluminium

Description

This lecture helps to understand the general principles, methods, properties and applications of plating on aluminium. Some knowledge in general electrochemistry is assumed.

Subjects

aluminium | aluminum | european aluminium association | EAA | Training in Aluminium Application Technologies | training | metallurgy | technology | lecture | surface treatment | non-galvanic methods | mechanical finishes | organic finishes | chemical methods | pickling | etching | chemical polishing | chemical conversion coating | electroless plating | autocatalytic plating | ion-exchange plating | electrolytic methods | electropolishing | electroplating | platable metals | anodising | corematerials | ukoer

License

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

Site sourced from

http://core.materials.ac.uk/rss/talat.xml

Attribution

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TALAT Lecture 1202: Metallography of Aluminium Alloys

Description

This lecture aims at providing a survey of the metallographic techniques available for the examination of aluminium and its alloys. The information must be sufficient to be sure that the students and the users are able to choose the most suitable technique to solve their problems in the examination of samples. The lecture should contain a direct understanding of the main problems in the metallography of the different classes of aluminium materials.

Subjects

aluminium | aluminum | european aluminium association | eaa | talat | training in aluminium application technologies | training | metallurgy | technology | lecture | metallography | sample preparation | grinding | polishing | etching | anodising | electropolishing | dimpling | ion milling | polarised light | electron channelling | interference contrast | high resolution electron microscopy | sem | tem | hrem | hvem | optical microscopy | high voltage electron microscopy | commercial purity | wrought alloys | foundry alloys | 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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Wrought-grade aluminium alloy

Description

1wt.% of each solute; refined with TiB2 particles. Deformation of grain structure is due to cutting of sample with scissors. This micrograph illustrates the effect of deformation on a previously equiaxed structure. Strain causes the elongation of grains and the subsequent anodising produces 'mottled' grain colours; the oxide layer is not of constant orientation or thickness across a grain.The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation and oxide thickness; hence the grain structure is imaged.

Subjects

alloy | aluminium | anodising | deformation | equiaxed | iron | magnesium | metal | silicon | 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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As-cast wrought-grade aluminium alloy

Description

1wt.% of each solute. No addition of grain refinement particles (e.g. TiB2). This micrograph illustrates one of the possible growth morphologies that a solidifying metal can adopt (c.f. micrograph 712). The dendritic structure is the result of instabilities in the solid-liquid interface during growth due to the rejection of solute into the liquid phase. Dendritic grains are more prevalent in alloys of high solute content and larger grain sizes.The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation and oxide thickness; hence the grain structure is imaged.

Subjects

alloy | aluminium | anodising | dendrite | equiaxed | iron | magnesium | metal | silicon | 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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http://dspace.jorum.ac.uk/oai/request?verb=ListRecords&metadataPrefix=oai_dc

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As-cast wrought-grade aluminium alloy

Description

1wt.% of each solute. Addition of TiB2 particles facilitates the formation of a fine, equiaxed grain structure (grain refinement). This micrograph illustrates one of the possible growth morphologies that a solidifying metal can adopt (c.f. micrograph 711). The grains in this structure exhibit no dendritic branching, i.e. the solid-liquid interfaces of the growing grains are smooth. When a solid grain is growing from the liquid phase, it will initially exhibit a smooth interface; such an interface can become unstable as the grain becomes larger due to rejection of solute into the liquid phase. Hence, smooth grain boundaries are associated with fine grain structures and low solute contents. The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium

Subjects

alloy | aluminium | anodising | dendrite | equiaxed | iron | magnesium | metal | silicon | 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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TALAT Lecture 1252: Corrosion and Corrosion Protection

Description

This lecture outlines the metallurgical principles of corrosion and corrosion protection of aluminium alloys. Basic knowledge of physics and chemistry and some familiarity with TALAT lectures 1201 through 1205 is assumed.

Subjects

aluminium | aluminum | european aluminium association | eaa | talat | training in aluminium application technologies | training | metallurgy | technology | lecture | corrosion | crevice corrosion | poultice corrosion | fretting corrosion | stress corrosion | galvanic corrosion | pitting corrosion | intergranular corrosion | exfoliation | kinetic reactivity | electrochemical circuit | electrolytic corrosion | corrosion protection | anodising | chemical conversion coatings | 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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