Crystal structure and thermal stability of martensite in Cu-25Al-3Mn alloy
来源期刊：中国有色金属学报(英文版)2002年第4期
论文作者：李周 汪明朴 曹玲飞 徐根应 苏玉长
文章页码：712 - 715
Key words：shape memory alloy; Cu-Al-Mn alloy; thermal stability; thermal cycling
Abstract: The martensite structure in Cu-25Al-3Mn alloy and its thermal cycling a nd aging behavior are studied. It is convinced that the M2H martensite can be obtained by water-quenched, and the atoms distribution on the basal plane of the martensite is: (corner)—Al; (center of the plane)—Cu; (middle o f b-side)—22/25Cu+3/25Mn. The lattice parameters are determined to be a=0.4459nm, b=0.5279nm, c=0.4241nm, β=88.64°. The triangle and other complicated configurations consisting of the variant group in the martensite are discovered. It is showed that the tested alloy has a high thermal stability when aging at average temperature in the parent phase, and the thermoelastic martensite amount is up to 90% after aging for 96h at 400℃. The thermal cycling has a little influence on the transformation temperature (Ms). When the number of thermal cycles is up to 1000, the increasing of Ms is only 8℃.
