快速冷却Ti-Nb-Ta三元合金的异常凝固行为

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-06-04 DOI:10.1016/j.jmrt.2025.06.031

Theo Mossop , David J. Browne , Mert Celikin

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引用次数: 0

摘要

通过金属增材制造（AM）加工β-钛合金是一个迅速扩大的领域，因此了解它们在快速冷却下的凝固行为是至关重要的。研究了Ti-Nb-Ta合金在不同冷却速率（c. 2000-20,000 K/s）下的吸力凝固。Ti-20Nb-10Ta （wt.%）合金在快速凝固时，溶质优先保留在枝晶中，存在反向分配效应。在相对较慢冷却的样品中，微偏析遵循Scheil凝固理论。随着冷却速率的增加，柱状结构被等轴结构所取代。这些效应在Ti-25Nb和Ti-35Ta二元合金中没有观察到。

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Anomalous solidification behaviour in rapidly cooled Ti–Nb–Ta ternary alloys

Processing β-titanium alloys via metal additive manufacturing (AM) is a rapidly expanding area, hence understanding their solidification behaviour under rapid cooling is critical. The solidification of Ti–Nb–Ta alloys was investigated under various cooling rates (c. 2000-20,000 K/s) using suction casting. An inverted partitioning effect was determined for Ti–20Nb–10Ta (wt.%) alloy, where solute is preferentially retained in the dendrites under very rapid solidification. In relatively slower-cooled samples, the microsegregation followed Scheil solidification theory. Moreover, columnar morphology was replaced with equiaxed structures with increasing cooling rate. These effects were not observed in the thermodynamically similar binary alloys, Ti–25Nb and Ti–35Ta.

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.