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"brief_description": "Glass ceramic, heat treated at 750° C for 3 hours",
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"brief_description": "Cu 80, Sn 20 (wt%) bronze, exhibiting dendritic solidification",
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"brief_description": "Nickel low carbon steel, quenched and tempered",
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"brief_description": "As-cast wrought-grade aluminium alloy (Al-Mg-Fe-Si containing < 1wt.% of each solute). Addition of TiB2 particles facilitates the formation of a fine, equiaxed grain structure (grain refinement).",
"long_description": "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 (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation; hence the grain structure is imaged.",
"contributor": "T Quested",
"organisation": "Department of Materials Science and Metallurgy, University of Cambridge",
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"brief_description": "Low alloy medium carbon steel, containing Ni, Cr, Mo, annealed",
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