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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties Determined in Compressive Tests of Quasi-Rapidly Solidified NiAl-Cr(Mo)-Hf Eutectic Alloy After Hot Isostatic Pressure and High Temperature Treatments
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Microstructure and Mechanical Properties Determined in Compressive Tests of Quasi-Rapidly Solidified NiAl-Cr(Mo)-Hf Eutectic Alloy After Hot Isostatic Pressure and High Temperature Treatments

机译：等静压NiAl-Cr（Mo）-Hf共晶合金在热等静压和高温处理后的压缩试验中确定的组织和力学性能

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摘要

The effect of high cooling rate of approximately 10~2 K/s and subsequent hot isostatic pressure (HIP) and high temperature (HT) treatment on the microstructure and mechanical properties of NiAl-based inter-metallic alloys was investigated. The results reveal that rapid solidification refines the microstructure of the NiAl-Cr(Mo)-0.5Hf eutectic alloy and transforms the Ni_2AlHf Heusler phase, which is present in the equilibrium state to a metastable Hf(Ni, Al, Cr) solid solution phase. Simultaneously, the shape and distribution of the Hf(Ni, Al, Cr) solid solution phase were considerably improved. After the HIP treatment, the Hf(Ni, Al, Cr) solid solution phase has changed from continuous distribution along eutectic cell boundaries into semicontinuous distribution, and the primary NiAl(Cr, Mo) phase has coarsened. The HT treatment reduces the volume fraction of the primary NiAl(Cr, Mo) phase and optimizes the distribution of the Hf(Ni, Al, Cr) solid solution phase. Rapid solidification and the resulting fine-grained microstructure will significantly improve the mechanical properties of the alloy in compression tests. However, additional HIP and HT treatments enhance the high-temperature strength properties obviously.
机译：研究了大约10〜2 K / s的高冷却速率以及随后的热等静压（HIP）和高温（HT）处理对NiAl基金属间合金的组织和力学性能的影响。结果表明，快速凝固细化了NiAl-Cr（Mo）-0.5Hf共晶合金的微观结构，并将处于平衡状态的Ni_2AlHf Heusler相转变为亚稳态Hf（Ni，Al，Cr）固溶体相。 。同时，Hf（Ni，Al，Cr）固溶相的形状和分布得到了显着改善。 HIP处理后，Hf（Ni，Al，Cr）固溶相已从沿共晶晶胞边界的连续分布变为半连续分布，并且初始NiAl（Cr，Mo）相已经粗化。 HT处理可减少初级NiAl（Cr，Mo）相的体积分数，并优化Hf（Ni，Al，Cr）固溶体相的分布。快速凝固和由此产生的细晶粒组织将在压缩试验中显着改善合金的机械性能。但是，额外的HIP和HT处理明显提高了高温强度性能。

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