定向凝固NiAl-Cr(Mo,Hf)合金的显微组织及力学性能研究

材料工程, 2001, 1(1): 3-6. doi: 10.3969/j.issn.1001-4381.2001.01.001

定向凝固NiAl-Cr(Mo,Hf)合金的显微组织及力学性能研究

崔传勇 ^1, , 陈玉喜 ^2, , 郭建亭 ^3, , 李斗星 ^4, , 叶恒强 ^5,

1.中国科学院金属研究所，沈阳110015

2.中国科学院金属研究所，沈阳110015

3.中国科学院金属研究所，沈阳110015

4.中国科学院金属研究所，沈阳110015

5.中国科学院金属研究所，沈阳110015

基金项目: 国家自然科学基金(59895152) 国家高技术研究发展计划(863计划)(715-005-0030)

关键词： NiAl-Cr(Mo)-Hf , Heusler(Ni2AlHf)相 , G(Ni16Hf6Si7)相 , 力学性能

The Microstructure and Mechanical Property of a Directionally Solidified NiAl-Cr(Mo,Hf) Composite

运用Bridgman技术制备了定向凝固NiAl-28Cr-5.5Mo-0.5Hf合金，利用扫描电镜和透射电镜分析了合金的显微组织，制备态合金是由NiAl、Cr(Mo)和不连续的网状Heusler（Ni2AlHf）相组成，细小弥散的方型G相与Ni2AlHf相相伴分布在NiAl和Cr(Mo)相界附近，分析和推测了G相和Ni2AlHf相聚集生长的原因。HIP处理后，NiAl和Cr(Mo)相界上的网状Heusler相减少，G相消失。还研究了合金室温至高温下的压缩性能和高温拉伸行为，分析了合金性能提高的原因。

In-situ composite based on the NiAl-Cr(Mo) eutectic system hasbeen successfully produced by Standard Bridgman method and its microstructure was studied using SEM and TEM. The composite was composed of NiAl matrix, Cr(Mo) lamellar and discontinuous Ni2AlHf phase. Fine G-precipitate was cubic in shape and co-existed with Heusler phase at NiAl/Cr(Mo) interface. The solidification process of the composite was also discussed. After HIP(1300℃/100MPa/2h) treatment, the Heusler phase at the NiAl and Cr(Mo) interface was reduced greatly and fine G-precipitate disappeared. The compress property from room temperature to elevated temperature and the tensile property at elevated temperature were also investigated. The mechanism responsible for the improved strength was also analyzed.

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