Microstructure,phase transformation and mechanical properties of NiMnGa particles/Cu composites fabricated by SPS  

SPS制备NiMnGa/Cu复合材料的显微组织、相变和力学性能

作　　者：Ping GAO Zhao-xin LIU Bing TIAN Yun-xiang TONG Feng CHEN Li LI 高萍;刘朝信;田兵;佟运祥;陈枫;李莉(哈尔滨工程大学材料科学与化学工程学院材料加工及智能制造研究所,哈尔滨150001;青岛双瑞海洋环境工程股份有限公司,青岛266101)

机构地区：[1]Institute of Materials Processing and Intelligent Manufacturing,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China [2]Sunrui Marine Environment Engineering Co.,Ltd.,Qingdao 266101,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第10期3291-3300,共10页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51201044);High-level Scientific Research Guidance Project of Harbin Engineering University,China(No.3072022TS1006);Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province,China(No.LBH-Q16046);Key Laboratory of Superlight Materials&Surface Technology(Harbin Engineering University),Ministry of Education,China.

摘　　要：Microstructure,phase transformation and mechanical properties of NiMnGa particles/Cu composites prepared by spark plasma sintering method were investigated by SEM,EDS,XRD,susceptibility measurements and mechanical tests.The NiMnGa particles were found to react with Cu matrix and the composites exhibited a similar crystal structure to the Cu matrix.The martensitic transformation and Curie transition of the composites were weakened due to the composition change of NiMnGa particles caused by reactions.With increasing NiMnGa particles content,the martensitic transformation and Curie transition of the composites were enhanced to some extent.However,the martensitic transformation temperature and Curie transition temperature were decreased by~50 K as compared to those of the original NiMnGa particles.The compressive strength of the composites increased with the increase of NiMnGa particles content,whereas the compressive strain was decreased gradually.采用SEM、EDS、XRD、交流磁化率测试和力学测试研究放电等离子体烧结法制备NiMnGa颗粒/Cu复合材料的显微组织、相变和力学性能。研究发现,NiMnGa颗粒与Cu基体发生反应,复合材料具有与Cu基体相似的晶体结构。由于反应导致NiMnGa颗粒发生成分变化,因此,复合材料的马氏体相变和居里转变被弱化。随着NiMnGa颗粒含量增加,复合材料的马氏体相变和居里相变在一定程度上得到增强。与原始NiMnGa颗粒相比,复合材料的马氏体相变温度和居里转变温度降低约50 K。随着NiMnGa颗粒含量增加,复合材料的压缩强度得到提高,但压缩应变逐渐降低。

关 键 词：NiMnGa alloys Cu composites spark plasma sintering MICROSTRUCTURE phase transformation mechanical properties 

分 类 号：TB331[一般工业技术—材料科学与工程]