Effect of Sn substitution and heat treatment on microstructure and microhardness of Co_(38)Ni_(34)Al_(28-x)Sn_x magnetic shape memory alloys  

添加Sn及热处理对Co_(38)Ni_(34)Al_(28-x)Sn_(x)磁性形状记忆合金显微组织和显微硬度的影响(英文)

作　　者：苏佳佳[1,2] 谢致薇[1] 杨元政[1] 

机构地区：[1]广东工业大学材料和能源学院,广州510006 [2]广东工程职业技术学院,广州510095

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第9期2158-2163,共6页中国有色金属学报（英文版）

基　　金：Projects (50771037, 50371020) supported by the National Natural Science Foundation of China;Project (2011B090400485) supported by the Combination Project for Guangdong Province and the Ministry of Education, China

摘　　要：Sn was used to replace Al in Co38Ni34Al28 alloy. The microstructure and microhardness of Co38Ni34Al28-xSnx （x=0, 1, 2, 3） magnetic shape memory alloys were investigated at different heat treatment temperatures （1373 K, 1473 K, and 1573 K） for 2 h. The results show that more Sn substitution reduces the content of γ-phase and a partial phase of martensite can be obtained in Co38Ni34Al28-xSnx （x=1, 2, 3） alloys after treatment at 1573 K for 2 h. The maximum martensite phase appears when 2% Al is substituted by Sn. The reverse martensitic transformation temperature of Co38Ni34Al28-xSnx alloys increases at x=1 and 2, then decreases as x=3. As the content of Sn and the temperature increase, the microhardness will increase.在Co38Ni34Al28合金体系中添加 Sn,研究Sn含量及不同的热处理温度(1373 K,1473 K,1573 K)下,保温2h对Co38Ni34Al28-xSnx(x=1,2,3)合金显微组织和硬度的影响。结果表明,添加适量的Sn使合金中γ相组织减少;在1573K保温2h后,在室温下获得部分马氏体组织;当Sn 替代 2%Al 时,其显微组织中马氏体组织的比例较高。随着Sn含量的增多和热处理温度的升高,合金的硬度也随着增大。另外,合金马氏体的逆相变温度在Sn含量为1%和2%时升高,在Sn含量为3%时反而降低。

关 键 词：magnetic shape memory alloy Sn substitution Co-Ni-Al alloy MICROSTRUCTURE martensitic transformation 

分 类 号：TG139.6[一般工业技术—材料科学与工程]