Comparison of Cu−Al−Ni−Mn−Zr shape memory alloy prepared by selective laser melting and conventional powder metallurgy  

选区激光熔化和传统粉末冶金法制备Cu−Al−Ni−Mn−Zr形状记忆合金的对比

作　　者：Dennis GERA Jonadabe SANTOS Cláudio SKIMINAMI Piter GARGARELLA Dennis GERA;Jonadabe SANTOS;Cláudio SKIMINAMI;Piter GARGARELLA(Postgraduate Program in Materials Science and Engineering,Federal University of São Carlos,São Carlos,Brazil;Materials Engineering Department,Federal University of São Carlos,R.Washington Luís,km 235-SP 310,São Carlos,Brazil)

机构地区：[1]Postgraduate Program in Materials Science and Engineering,Federal University of São Carlos,São Carlos,Brazil [2]Materials Engineering Department,Federal University of São Carlos,R.Washington Luís,km 235-SP 310,São Carlos,Brazil

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第12期3322-3332,共11页中国有色金属学报（英文版）

摘　　要：This work aimed to investigate and critically analyze the differences in microstructural features and thermal stability of Cu−11.3Al−3.2Ni−3.0Mn−0.5Zr shape memory alloy processed by selective laser melting(SLM)and conventional powder metallurgy.PM specimens were produced by sintering 106−180μm pre-alloyed powders under an argon atmosphere at 1060°C without secondary operations.SLM specimens were consolidated through melting 32−106μm pre-alloyed powders on a Cu−10Sn substrate.Mechanical properties were measured through Vickers hardness testing.Differential scanning calorimetry was conducted to assess the martensitic transformation temperatures.X-ray diffraction patterns were collected to identify the metallurgical phases.Optical and scanning electron microscopy was used to analyze the microstructural features.b′1 martensite was found,irrespective of the processing route,although coarser martensitic variants were present in PM-specimens.In conventional powder metallurgy samples,intergranular eutectoid constituents and stabilized austenite also formed at room temperature.PM-specimens showed similar average hardness values to the SLM-specimens,albeit with high standard deviation linked to the porosity.The specimens processed by SLM showed reversible martensitic transformation(T0=171°C).PM-processed specimens did not show shape memory effects.研究和分析选区激光熔化(SLM)与传统粉末冶金(PM)法制备Cu−11.3Al−3.2Ni−3.0Mn−0.5Zr形状记忆合金的显微组织特征和热稳定性差异。PM样品是将106~180μm预合金粉末在氩气气氛、1060℃下烧结制备的,无辅助加工,SLM样品是在Cu−10Sn基板上熔化32~106μm的预合金粉末制备的。通过维氏硬度试验评价材料的力学性能,采用差示扫描量热法测定马氏体相变温度,采用X射线衍射谱鉴定相成分,利用光学显微镜和扫描电子显微镜分析显微组织特征。结果表明,两种方法制备的合金中均发现β′1马氏体相,而在PM样品中存在粗大的马氏体变体。传统的粉末冶金样品在室温下会形成晶间共析成分和稳定的奥氏体。PM样品具有与SLM样品相似的平均硬度值,而与孔隙率相关的标准偏差较高。SLM样品具有可逆的马氏体相变(T0=171℃),而PM样品没有形状记忆效应。

关 键 词：shape memory alloys powder metallurgy additive manufacturing selective laser melting Cu-based alloys 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG139.6[一般工业技术—材料科学与工程] TF125[金属学及工艺—合金]