| 定向凝固NiAl-Cr(Mo,Hf)合金的显微组织及力学性能研究 |
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| 引用本文： | 崔传勇,陈玉喜,郭建亭,李斗星,叶恒强. 定向凝固NiAl-Cr(Mo,Hf)合金的显微组织及力学性能研究[J]. 材料工程, 2001, 1(1): 3-6 |
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| 作者姓名： | 崔传勇 陈玉喜 郭建亭 李斗星 叶恒强 |
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| 作者单位： | 中国科学院金属研究所，沈阳110015 |
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| 基金项目： | 国家自然科学基金资助项目 !(5 9895 15 2 )，国家 863! (715 -0 0 5 -0 0 3 0 )资助项目 |
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| 摘 要： | 运用Bridgman技术制备了定向凝固NiAL-28Cr－5.5Mo-0.5Hf合金，利用扫措电镜和透射电镜 合金的显微组织，制备态合金是由NiAl、Cr(Mo）和不边疆的网状Heusler(Ni2AlHf0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。
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| 关 键 词： | 镍铝合金 微合金化 显微组织 铬 钼 |
| 文章编号： | 1001-4381(2001)01-0003-04 |
| 修稿时间： | 2000-03-20 |
The Microstructure and Mechanical Property of a Directionally Solidified NiAl-Cr(Mo,Hf) Composite |
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| CUI Chuan yong,CHEN Yu xi,GUO Jian ting,LI Dou xing,YE Heng qiang. The Microstructure and Mechanical Property of a Directionally Solidified NiAl-Cr(Mo,Hf) Composite[J]. Journal of Materials Engineering, 2001, 1(1): 3-6 |
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| Authors: | CUI Chuan yong CHEN Yu xi GUO Jian ting LI Dou xing YE Heng qiang |
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| Abstract: | 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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| Keywords: | NiAl Cr(Mo) Hf Heusler phase G phase mechanical property |
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