电磁场与TiB2纳米粒子作用下CuAlMn形状记忆合金晶粒细化技术研究  

Solidification in Electromagnetic Field of TiB-Doped Shape-Memory CuAlMn-Alloy:A Methodological Study

作　　者：金文中[1] 柳翊 李羽晨 李廷举[2] 殷国茂[2] Jin Wenzhong;Liu Yi;Li Yuchen;Li Tingju;Yin Guomao(Luoyang Key Laboratory of Advanced Materials Forming Technology,Luoyang Institute of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]洛阳理工学院洛阳市先进材料成型技术重点实验室,洛阳471023 [2]大连理工大学材料科学与工程学院,大连116024

出　　处：《真空科学与技术学报》2020年第7期658-661,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(50474055);河南省高等学校重点科研项目(18A430019);洛阳理工学院预研项目(2017YZY08)。

摘　　要：使用扫描电子显微镜和光学显微镜研究了电磁场与TiB2纳米粒子作用下CuAlMn形状记忆合金的晶粒细化机理。结果表明:TiB2纳米粒子与CuAlMn形状记忆合金基体的最小二维错配度是5.28%,因此,TiB2纳米粒子可以作为CuAlMn形状记忆合金的有效异质形核核心显著细化其晶粒组织。电磁场能够有效抑制TiB2纳米粒子的团聚,提高TiB2纳米粒子的晶粒细化效果并能减少球形孔洞缺陷。添加1%TiB2纳米粒子的同时施加120 A的旋转电磁场,可以将CuAlMn形状记忆合金真空熔铸铸锭的晶粒组织从1.62细化至0.41 mm。Liquid CuAlMn shape-memory alloy,doped with TiB2-nanoparticles,was solidified in rotating electromagnetic(EM)field for grain refinement.The influence of the TiB2-addition and rotating EM field on the grain-size was investigated with scanning electron microscopy.The results show that TiB2-nanoparticles and EM field had a major impact.Specifically,the uniformly distributed TiB2-nanoparticles acted as the heterogeneous nucleation seeds,because the minimum 2 D disregistry was calculated to be 5.28%;the dual-effect of TiB2-particles,nucleation-seed and pinning of grain-boundary,explained the grain-size reduction in low overcooling-degree of solidification.Besides,the rotating EM field effectively suppressed the agglomeration of TiB2-nanoparticles and prevented formation of spherical stomata defects.The addition of TiB2-1.0%(wt)and EM field(generated by coil-current of 120 A)decreased the average grain-size to 0.41 mm,much smaller than that solidified without EM field and without TiB2-nanoparticles.

关 键 词：电磁场 TiB2纳米粒子 CuAlMn形状记忆合金 晶粒细化 

分 类 号：TG132.3+2[一般工业技术—材料科学与工程]