γ相对磁形状记忆合金Co-Ni-Ga马氏体相变和形状记忆效应的影响  

Influence of γ Phase on the Martensitic Transformation and Shape Memory Effect of Co-Ni-Ga Ferromagnetic Shape Memory Alloy

作　　者：霍颜秋[1] 龙秀慧[2] 谢华[1] 李建国[1] 

机构地区：[1]上海交通大学,上海200240 [2]滨州学院,山东滨州256600

出　　处：《稀有金属材料与工程》2010年第7期1279-1283,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目50671068

摘　　要：利用扫描电镜、X射线衍射仪、差示扫描量热分析仪和材料试验机等手段,研究不同热处理条件下γ相对Co44Ni26Ga30合金马氏体相变温度、力学性能和形状记忆效应的影响。结果表明:随热处理保温时间的延长,γ相析出增多,使得马氏体相变温度降低;γ相的引入显著改善合金的韧性,但损害了合金的形状记忆回复性能;通过适当的热机械训练可以大幅提高合金的形状记忆回复能力,最大形状回复率可达93%。By means of SEM,XRD,DSC and a materials testing machine,the effects of γ phase on the martensitic transformation temperature Ms,mechanical properties and shape memory effect of Co44Ni26Ga30 alloy with different heat-treatments were investigated. Results show that the volume fraction of γ phase increased with prolonging the holding time during the heat treatment,giving rise to the decrease of Ms. The introduction of γ phase improved the ductility of the alloy greatly while deteriorated the shape memory recovery ratio. Upon appropriate thermo-mechanical training,the shape recovery ratio can be enhanced significantly to 93%.

关 键 词：Γ相 Co-Ni-Ga合金 马氏体相变 形状记忆效应 

分 类 号：TG139.6[一般工业技术—材料科学与工程]