Ni50Mn37Sn13(Co/Fe)9合金的显微组织结构  

The Microstructure of Ni_(50)Mn_(37)Sn_(13)(Co/Fe)_9 Alloys

作　　者：刘瑞蕊[1] 周啸[1] 周海涛[1] 刘克明[2] 彭谦之[1] 彭勇[1] 钟芳华[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]江西省科学院,江西省铜钨新材料重点实验室,南昌330029

出　　处：《材料导报》2014年第2期9-13,共5页Materials Reports

基　　金：国家自然科学基金(50961006);江西省自然科学基金(20114BAB206016)

摘　　要：采用电弧熔炼-真空甩带-长时间高温退火工艺制备了Ni50Mn37Sn13、Ni50Mn37Sn13Co9和Ni50Mn37Sn13-Fe9三种不同状态下的Heusler合金。利用光学显微镜、X射线衍射仪、差示扫描量热仪及电子探针对所得铸锭、薄带及高温退火薄带试样进行显微组织结构分析。结果表明3种合金的铸锭试样均为枝晶结构,由马氏体、奥氏体及杂质相组成;薄带试样仅为单一奥氏体相;退火后的薄带试样又恢复到类似于铸锭试样的组织结构。另外,Co/Fe元素的加入增加了合金凝固时的成分过冷度,且没有改变合金的组织结构,只是分别占据了合金中的Mn/Ni原子位点。Ni50 Mn37 Sn13,Ni50 Mn37 Sn13 Co9 and Ni50 Mn37 Sn13 Fe9 Heusler alloys were prepared by arc meltingmelt spun-annealing with high temperature.The microstructure of ingots,ribbons and annealed ribbons were tested by optical microscope （OM）,X-ray diffractometer （XRD）,differential scanning calorimeter （DSC） and electron probe microanalyzer （EPMA）.The results show that the microstructure of the three ingots is dendritic crystal composited by martensite,austenite and some impurity phase; the ribbons consist of single austenite phase; the annealed ribbons have the similar structure with ingots.Besides,the composition super-cooling increases by addition of Co/Fe,and the structure of these three alloys has no change which suggests that Co/Fe just occupy the Mn/Ni sites respectively.

关 键 词：HEUSLER合金 铸锭 薄带 显微组织结构 

分 类 号：TG113.12[金属学及工艺—物理冶金]