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由于低温储存,In-Bi-Sn合金中的相变和机械性能

Jiye Zhou¹, Xin Fu Tan¹, Stuart D McDonald¹

¹Nihon Superior Centre for the Manufacture of Electronic Materials (NS CMEM), School of Mechanical and Mining Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia.

Materials (Basel, Switzerland)

|August 10, 2024

概括

-双-锡 (In-Bi-Sn) 合剂在冷暴露后显示出强度提高,但延展性降低. 微结构分析揭示了在低温应用中影响这些机械性质变化的相位变化.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
低温工程低温工程是什么?

背景情况:

低温合金的印-双-锡 (In-Bi-Sn) 对冷和太空探索至关重要.
了解长时间低温暴露下的合金行为对于可靠的性能至关重要.
之前的研究还没有完全详细说明这些合金在-20°C下长时间的微观结构演变和机械性质变化.

研究的目的:

在 -20 °C下10个月后研究两种In-Bi-Sn合剂组合的机械性能和微观结构变化.
为了将观察到的微观结构变化与最终抗拉强度和延伸到故障的变化相关联.
阐明不同相 (BiIn2 ((Sn),γ-InSn4 ((Bi) 和β-In3Sn ((Bi)) 在合金对冷条件的反应中的作用.

主要方法:

两个In-Bi-Sn合金的制备和表征:In15wt%Bi35wt%Sn和In30wt%Bi20wt%Sn.
将样品暴露在低温环境 (-20°C) 中10个月.
机械测试,包括最终抗拉强度和延伸到故障测量.
使用扫描电子显微镜 (SEM) 和电子反射散射衍射 (EBSD) 的微结构分析.

主要成果:

在冷暴露后,在In-Bi-Sn合金组合物中观察到最终抗拉强度的显著增加.
特别是对于In30wt%Bi20wt%Sn合金,记录了延长到故障的显著减少.
SEM和EBSD分析显示了构成相 (BiIn2(Sn),γ-InSn4 ((Bi) 和β-In3Sn ((Bi)) 的比例和组成的变化.

结论:

长时间暴露于-20°C会提高In-Bi-Sn的抗拉强度,但可能会损害柔性,特别是在含量较高的合金中.
观察到的机械性质变化与合金内部的微观结构变化和相变化直接相关.
这些发现对于优化In-Bi-Sn合剂配方,以满足高要求的冷和太空应用,至关重要.

关键词:

在低温环境下.机械属性机械属性机械属性阶段转换的相位转换.三元合金三元合金

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