形变时效对FeMnSiCrNi合金形状回复率和相变温度的影响  

Influence of ageing after deformation on shape recovery ration and transformation temperature in FeMnSiCrNi alloy

作　　者：杨世洲[1,2] 李宁[1] 文玉华[1] 彭华备[1] 刘文博[1] 

机构地区：[1]四川大学制造科学与工程学院,成都610065 [2]西华大学材料科学与工程学院,成都610039

出　　处：《材料科学与工艺》2012年第5期66-70,共5页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50871072;11076019)

摘　　要：为了进一步提高Fe-14Mn-6Si-8Cr-5Ni合金的形状记忆效应,对固溶态合金采用了形变时效的方法处理,并利用光学显微分析、X射线衍射分析和透射电子显微分析的测试手段分析了时效温度和时效时间对合金形状回复率和相变温度的影响.结果表明,固溶态合金经10%拉伸和600℃时效10 min时,形状回复率提高幅度最大,由固溶态的48%提高到84.7%,并且合金γ→ε马氏体转变的起始温度Ms由固溶态的34℃降低到13.2℃.合金的形状回复率得到提高的主要原因是合金中热诱发ε马氏体已经消失,组织为奥氏体和大量定向α'马氏体,这样的组织特征有利于应力诱发γ→ε马氏体相变以及它们的逆相变.To further enhance shape memory effect （SME） for Fe- 14Mn- 6Si- 8Cr- 5Ni alloys, the alloy under solid solution condition was aged after deformation, and the influence of ageing temperature and ageing time on shape recovery ration and transformation temperature in an alloy were investigated by means of optical microscopy, XRD and TEM. The results revealed that the shape recovery ration for an alloy aged at 600 ℃ for 10 rain after 10% tensile deformation greatly rose from 48% to the maximum value of 84.7% under solid solution condition and the r→ε martensite transformation starting temperature M, dropped from 34 ℃ to 13.2 ℃. The principal reasons that make the remarkable improvement in shape recovery ration are that thermal induced martensite in an alloy through above treatments disappears and the constituent phases are austenite and much directional α＇nartensite. This structure is just advantageous to stressinduced r→ε martensite transformation and reverse transformation.

关 键 词：FE-MN-SI-CR-NI合金 形变时效 形状回复率 相变温度 时效温度 

分 类 号：TG139.6[一般工业技术—材料科学与工程]