Solidification of Ni-Re Peritectic Alloys.

IF 2.2 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2019-01-01

W J Boettinger, D E Newbury, N W M Ritchie, M E Williams, U R Kattner, E A Lass, K-W Moon, M B Katz, J H Perepezko

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Abstract

Differential thermal analysis (DTA) and microstructural and microprobe measurements of DTA and as-cast Ni-Re alloys with compositions between 0.20 and 0.44 mass fraction Re provide information to resolve differences in previously published Ni-Re phase diagrams. This investigation determines that the peritectic invariant between liquid, Re-rich hexagonal close packed and Ni-rich face center cubic phases, L + HCP → FCC, occurs at 1561.1 °C ± 3.4 °C (1σ) with compositions of liquid, FCC and HCP phases of 0.283 ± 0.036, 0.436 ± 0.026, and 0.828 ± 0.037 mass fraction Re, respectively. Analysis of the microsegregation in FCC alloys yields a partition coefficient for solidification, k = 1.54 ± 0.09 (mass frac./mass frac.). A small deviation from Scheil behavior due to dendrite tip kinetics is documented in as-cast samples. No evidence of an intermetallic phase is observed.

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Ni-Re包晶合金的凝固。

差热分析(DTA)以及DTA和铸态Ni-Re合金的显微组织和显微探针测量为解决先前发表的Ni-Re相图的差异提供了信息。结果表明，在1561.1℃±3.4℃(1σ)温度下，液相、FCC和HCP相的Re质量分数分别为0.283±0.036、0.436±0.026和0.828±0.037时，液相、富Re六方密堆积相和富ni面心立方相L + HCP→FCC之间的包晶不变性发生。通过分析FCC合金中的微偏析，得到了凝固分配系数k = 1.54±0.09(质量断裂)。/大规模压裂。)。在铸态样品中，由于枝晶尖端动力学导致的舍伊尔行为的小偏差被记录下来。没有观察到金属间相的证据。

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来源期刊

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 工程技术-材料科学：综合

CiteScore

5.30

自引率

7.10%

发文量

322

审稿时长

6 months

期刊介绍： Metallurgical and Materials Transactions A focuses on the latest research in all aspects of physical metallurgy and materials science. It explores relationships among processing, structure, and properties of materials; publishes critically reviewed, original research of archival significance. The journal address the main topics of alloy phases; transformations; transport phenomena; mechanical behavior; physical chemistry; environment; welding & joining; surface treatment; electronic, magnetic & optical material; solidification; materials processing; composite materials; biomaterials; and light metals. MMTA publishes Technical Publications, Communications, Symposia, and more. Published with ASM International, The Materials Information Society and The Minerals, Metals & Materials Society (TMS)