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"brief_description": "As-cast wrought-grade aluminium alloy (Al-Mg-Fe-Si containing < 1wt.% of each solute). No addition of grain refinement particles (e.g. TiB2).",
"long_description": "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.",
"contributor": "T Quested",
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"contributor": "Prof T W Clyne",
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"contributor": "Prof T W Clyne",
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"brief_description": "TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 40s for austenite stabilization",
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"contributor": "Dr Amar K De",
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"brief_description": "Al 75, Cu 25 (wt%), hypoeutectic alloy",
"long_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.",
"contributor": "Prof T W Clyne",
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"brief_description": "Al 75, Cu 25 (wt%), hypoeutectic alloy",
"long_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.",
"contributor": "Prof T W Clyne",
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"brief_description": "Fe, C 0.1 (wt%), hypoeutectoid alloy",
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"contributor": "Prof T W Clyne",
"organisation": "Department of Materials Science and Metallurgy, University of Cambridge",
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"brief_description": "Cu 98, Be 2 (wt%), quenched and aged - annealing twins",
"long_description": "This sample was solution treated, quenched and aged. Recrystallisation occurs during ageing creating annealing twins.",
"contributor": "Prof T W Clyne",
"organisation": "Department of Materials Science and Metallurgy, University of Cambridge",
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"brief_description": "Normalised low carbon manganese steel, taken transverse to directionality",
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"contributor": "Dr R F Cochrane",
"organisation": "Department of Materials, University of Leeds",
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