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首页> 外文会议>International Workshop on Advanced Metallic Materials and Processing Techniques for Aeronautical Applications; 20051118-20; Nanjing(CN) >Microstructure and mechanical properties of rapidly solidified NiAl-based eutectic alloy
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Microstructure and mechanical properties of rapidly solidified NiAl-based eutectic alloy

机译：快速凝固的NiAl基共晶合金的组织和力学性能

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摘要

The microstructure and compression behavior at room temperature of a rapidly solidified NiAl-Cr(Mo)-Hf eutectic alloy fabricated by water-cooled copper mold method were studied by a combination of SEM, EDS and compressive tests. The rapid solidification results in a shift in the coupled zone for the NiAl-Cr(Mo)-Hf eutectic alloy towards the side of Cr(Mo) phase. So the volume fraction of primary NiAl dendrite is increased which is detrimental to the mechanical behavior. On the other hand, the refined microstructure and fine dispersion Heusler phase by Ni_2 AlHf are beneficial to the improvement of mechanical properties. As a result, the strength increases by 40% and the compressive ductility increases by two times at room temperature, when compared with those of the as-cast state.
机译：结合SEM，EDS和压缩试验，研究了水冷铜铸法制备的NiAl-Cr（Mo）-Hf快速凝固NiAl-Cr（Mo）-Hf共晶合金的组织和室温压缩性能。快速凝固导致NiAl-Cr（Mo）-Hf共晶合金的耦合区向Cr（Mo）相侧偏移。因此，原始NiAl枝晶的体积分数增加，这不利于机械性能。另一方面，Ni_2AlHf细化的微结构和细分散的赫斯勒相有利于提高机械性能。结果，与铸态的那些相比，在室温下强度增加了40％并且压缩延展性增加了两倍。

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