Effect of Heat Treatment on Microstructure and Microhardness of Directionally Solidified NiAl-Cr(Mo)-Hf Intermetallic Alloy
来源期刊：材料热处理学报2004年第5期
论文作者：GUO Jian-ting XU Chun-mei XIE Xi-shan
关键词：NiAl; heat treatment; microstructure; microhardness;
摘 要：The effect of heat treatment on microstructure and microhardness of directionally solidified(DS)NiAl-Cr(Mo)-Hf alloy is investigated. The results indicate that there is little change in the morphology of NiAl and Cr(Mo) phases after heat treatment. However, the semicontinuous Heusler phase which is originally located at grain boundaries is partially reduced and fine Heusler particles re-precipitate within NiAl matrix. Furthermore, NiAl precipitates coarsen in Cr(Mo) phase and dislocations appear in Cr(Mo) phase. Microhardness of as-grown (DS)NiAl-28Cr-5Mo-1Hf alloy is much higher than that of (DS)NiAl-28Cr-6Mo and basically has no change after heat treatment.
GUO Jian-ting1，XU Chun-mei2，XIE Xi-shan2
(1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;
2.University of Science and Technology Beijing,Beijing,China)
摘要:The effect of heat treatment on microstructure and microhardness of directionally solidified(DS)NiAl-Cr(Mo)-Hf alloy is investigated. The results indicate that there is little change in the morphology of NiAl and Cr(Mo) phases after heat treatment. However, the semicontinuous Heusler phase which is originally located at grain boundaries is partially reduced and fine Heusler particles re-precipitate within NiAl matrix. Furthermore, NiAl precipitates coarsen in Cr(Mo) phase and dislocations appear in Cr(Mo) phase. Microhardness of as-grown (DS)NiAl-28Cr-5Mo-1Hf alloy is much higher than that of (DS)NiAl-28Cr-6Mo and basically has no change after heat treatment.
关键词:NiAl; heat treatment; microstructure; microhardness;
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