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"contributor": "Dr R F Cochrane",
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"contributor": "Dr Amar K De",
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"brief_description": "Cu 80, Sn 20 (wt%) bronze, exhibiting dendritic solidification",
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"brief_description": "IN718 nickel-based superalloy held for 3 hours at 850°C",
"long_description": "IN718 is a nickel-based superalloy composed of approximately 53 wt% Ni, 19 wt% Fe, 18 wt% Cr, 5 wt% Nb, and small amounts of Ti, Mo, Co, and Al. The alloy has a number of distinct phases present in its microstructure. These are namely the matrix, g, and the precipitates, g', g'', and d. The primary strengthening phase is g'' [1], the composition of which is Ni3Nb. It has a body-centred tetragonal structure, and forms semi-coherently as disc-shaped platelets within the g matrix, having three variants lying on the {100} planes. It is stable for over 10,000 hours at 600°C; however, above this temperature it decomposes to form g', Ni3Al (between 650°C and 850°C), and d, the same composition as g'' (between 750°C and 1000°C). It has been commented that, at large volume fractions and when it forms continuously along grain boundaries, d is detrimental to both strength and toughness [2]. The d phase that forms is more stable than the g'' phase, and has an orthorhombic structure. During cooling, d phase precipitates begin to form along the {111} planes in the matrix, nucleating at grain boundaries at approximately 1010°C. The g' precipitates, of L12 structure, are seen within the g matrix when it has been depleted of niobium due to the formation of g'' and d. The Time-Temperature-Transformation (TTT) diagram for IN718 shows that d precipitates at higher temperatures than the g'', and that over long periods of time both d and g' are more stable than g''. The micrograph shows the microstructure after being held for 3 hours at 850°C, the volume fraction of d is greater than when held for shorter periods of time.References: [1] J. W. Brooks and P. J. Bridges. Metallurgical Stability of Inconel Alloy 718. Superalloys '88, pages 33 - 42, 1988. [2] B. Gleeson. High-Temperature Corrosion of Metallic Alloys and Coatings: Volume II. In M. Schütze, editor, Corrosion and Environmental Degradation, volume 19 of Materials Science and Technology, chapter 5, pages 173 - 228. Wiley, 2000.",
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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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"contributor": "M Charles and A Cockburn",
"organisation": "Department of Materials Science and Metallurgy, University of Cambridge",
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20,
21,
24
],
"category": [
1
],
"element": [
6,
7
],
"brief_description": "Hypoeutectoid steel, normalised at 1100°C",
"long_description": "A hypoeutectoid alloy (carbon composition less than eutectoid). The first phase formed upon cooling from the austenite phase field is proeutectoid ferrite. Due to the lower solubility of carbon in ferrite, carbon is partitioned into the remaining austenite. At the eutectoid point the remaining carbon enriched austenite transforms to pearlite (a mixture of ferrite and cementite) which is the darker region of the micrograph. The proportion of pearlite is dependent upon the overall composition. The ferrite (light areas) is a good example of an allotriomorphic ferrite. This means that its shape does not reflect its internal crystalline symmetry as it nucleates on the austenite grain boundaries and hence follows the shape of the boundaries, the remaining austenite within the ferrite then transforms to pearlite, and is surrounded by the ferrite. The large size of the areas of pearlite arises due to the high normalisation temperature which causes the austenite grains to grow large.",
"contributor": "Dr R F Cochrane",
"organisation": "Department of Materials, University of Leeds",
"last_updated": "2025-09-23T07:48:24.600929Z",
"link_doitpoms": "https://www.doitpoms.ac.uk/miclib/full_record.php?id=233",
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"vox_size": 1.3745704467353952,
"rating": 9,
"barbox": [
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244,
449
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547,
525
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],
"barcol": [
255,
99
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"phases": [
188,
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"downloads": 15
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{
"id": 20,
"name": "Microstructure 068",
"short_name": "microstructure068",
"data_type": 1,
"technique": 1,
"keyword": [
1,
7,
19,
45
],
"category": [
1
],
"element": [
6,
7,
14
],
"brief_description": "Grey cast iron core with white cast iron periphery",
"long_description": "This sample shows a combination of white and grey cast irons. The core consists of a grey cast iron with a periphery of white cast iron.",
"contributor": "Prof T W Clyne",
"organisation": "Department of Materials Science and Metallurgy, University of Cambridge",
"last_updated": "2025-09-22T13:55:10.308445Z",
"link_doitpoms": "https://www.doitpoms.ac.uk/miclib/full_record.php?id=68",
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"data_2D": "https://microstructure-library.s3.eu-west-2.amazonaws.com/microstructure068/microstructure068_inpainted.png",
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"long_movie": "https://microstructure-library.s3.eu-west-2.amazonaws.com/microstructure068/microstructure068_long.mp4",
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"params": "https://microstructure-library.s3.eu-west-2.amazonaws.com/microstructure068/microstructure068_params.data",
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"rating": 6,
"barbox": [
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30
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236
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}
