Ni含量对Mg-Er-Ni合金组织的影响  

Effects of Ni Additions on the Microstructure of Mg-Er-Ni Alloys

作　　者：邵琦 尹健[1] 刘飞[1] Shao Qi;Yin Jian;Liu Fei(School of Aeronautical Manufacturing Engineering, Nanchang Hangkong Universit)

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2018年第6期684-687,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51661023)

摘　　要：采用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)和能谱分析(EDS)等手段,研究了Ni含量对Mg_(98-x)Er_2Ni_x(摩尔分数,下同,x=0,0.25,0.5,1)合金组织的影响。结果表明,铸态Mg_(98)Er_2合金组织为初生树枝状α-Mg相,晶内出现成分偏析,Mg_(97.75)Er_2Ni_(0.25)、Mg_(97.5)Er_2Ni_(0.5)和Mg_(97)Er_2Ni_1三种合金的组成相主要是α-Mg相和LPSO相,第二相的面积分数分别为12%、19%、34%。在540℃固溶处理时,含Ni的Mg_(98-x)Er_2Ni_x合金组织结构未发生明显改变,仍为α-Mg相和LPSO相,且第二相未发生明显溶解,面积分数相比铸态合金有所增加。Mg_(97.75)Er_2Ni_(0.25)、Mg_(97.5)Er_2Ni_(0.5)和Mg_(97)Er_2Ni_1三种合金固溶处理20h后的LPSO相面积分数分别为16%、34%、42%。The effects of Ni content on the microstructure of Mg98-xEr2Nix（x=0,0.25,0.5,1,mole fraction）alloy were investigated by means of OM（optical microscope）,XRD（X-ray diffraction）,SEM（scanning electron microscope）and EDS（energy dispersed spectrometer）.The results show that the ascast Mg（98）Er2alloy is composed of primary dendriteα-Mg phase with segregation of components.The composition phases of the three alloys of Mg97.5Er2Ni0.25,Mg97.5Er2Ni（0.5 ）and Mg97Er2Ni1,are mainly composed ofα-Mg phase and LPSO phase.The area fraction of the second phase reach 12%,19%and34%,respectively.During solid solution treatment at 540℃,the structure change of Mg98-xEr2Nixalloy can be ignored,and the second phase is not dissolved obviously.Compared with that of the as-cast alloys,the area fraction of the three alloys of Mg97.75Er2Ni0.25,Mg97.5Er2Ni0.5and Mg97Er2Ni1,after solution treatment,reach 16%,34%and 42%,respectively.

关 键 词：Mg-Er-Ni合金 LPSO相 固溶处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]