Effects of Heat Treatment and Thermal Cycling on Martensitic Transformation Behavior of Ni59Al11Mn30 High Temperature Shape Memory Alloy
来源期刊：材料热处理学报2004年第5期
论文作者：HE Zhi-rong
关键词：NiAlMn; shape memory alloy; martensitic transformation; heat treatment; thermal cycling;
摘 要：A reversible martensitic transformation (MT) takes place during cooling and heating in the solution quenched and the solution quenched plus aged Ni59Al11Mn30 alloy The MT temperature increases with increasing solution temperature. The excellent MT characteristics can be obtained from a process of 1000℃ solution quenched plus 400℃aged. Follow this process, the MT start temperature (Ms) and the reverse MT finish temperature (Af) are 469℃ and 548℃,respectively. The martensitic stabilization effect in the solution quenched and aged Ni59Al11Mn30 alloy is observed as an increase in the Af temperature of the first reverse MT during thermal cycles. This stabilization effect vanishes from the second thermal cycle. Thermal cycling can enhance the stability of the reversible MT. The microstructure of the quenched Ni59Al11Mn30 alloy consists of martensite (M) and gamma phase. The volume fraction of gamma phase is about 40%. The substructure of M and gamma phase is twins and dislocations, respectively. The hardness of M is higher than that of gamma phase. After aging treatment the basic phases of alloy do not change, but the hardness of the phases increases.
ZHOU Jing-en1，HE Zhi-rong2
(1.Xi'an Jiaotong University, Xi'an 710049, China;
2.Shaanxi University of Technology, Hanzhong 723003, China)
摘要:A reversible martensitic transformation (MT) takes place during cooling and heating in the solution quenched and the solution quenched plus aged Ni59Al11Mn30 alloy The MT temperature increases with increasing solution temperature. The excellent MT characteristics can be obtained from a process of 1000℃ solution quenched plus 400℃aged. Follow this process, the MT start temperature (Ms) and the reverse MT finish temperature (Af) are 469℃ and 548℃,respectively. The martensitic stabilization effect in the solution quenched and aged Ni59Al11Mn30 alloy is observed as an increase in the Af temperature of the first reverse MT during thermal cycles. This stabilization effect vanishes from the second thermal cycle. Thermal cycling can enhance the stability of the reversible MT. The microstructure of the quenched Ni59Al11Mn30 alloy consists of martensite (M) and gamma phase. The volume fraction of gamma phase is about 40%. The substructure of M and gamma phase is twins and dislocations, respectively. The hardness of M is higher than that of gamma phase. After aging treatment the basic phases of alloy do not change, but the hardness of the phases increases.
关键词:NiAlMn; shape memory alloy; martensitic transformation; heat treatment; thermal cycling;
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