长周期堆垛有序结构增强Mg-Zn-Y-(ZrB_(2))合金组织和性能的研究  

Research on the Microstructure and Properties of Mg-Zn-Y-(ZrB_(2))Alloy Enhanced by Long Period Stacking Ordered Structure

作　　者：郝建强 王碧心 赵侃 张金山[2] HAO Jian-qiang;WANG Bi-xin;ZHAO Kan;ZHANG Jin-shan(Department of Materials Science and Engineering,Jinzhong University,Jinzhong 030619,Shanxi,China;School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]晋中学院材料科学与工程系,山西晋中030619 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《铸造》2024年第12期1686-1693,共8页Foundry

基　　金：山西省基础研究计划项目(20210302124424);国家自然科学基金项目(51574175和51474153)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、XRD衍射仪、电子万能试验机、HVS-1000A型硬度计和正挤压实验机研究了长周期堆垛有序结构增强Mg-Zn-Y-(ZrB_(2))的微观组织和力学性能。结果表明:铸态Mg-Zn-Y-(ZrB_(2))合金组织由α-Mg基体、条块状LPSO相和网状W相组成,适量ZrB_(2)的加入可以细化晶粒,促进LPSO相的形成和抑制W相的析出;当ZrB_(2)含量为0.3wt.%时,合金达到最细的组织和最佳的力学性能;晶粒由42.6μm细化到22.8μm,合金的屈服强度由131 MPa增加到180 MPa,合金的抗拉强度由172 MPa增加到225 MPa,伸长率由6.9%增加到17.5%;随后对优化得到的合金进行固溶处理和不同挤压温度(350℃、400℃、450℃)下的试验,发现350℃挤压后合金表现出良好综合力学性能,屈服强度305 MPa,抗拉强度达到358 MPa,伸长率21%。The microstructure and properties of Mg-Zn-Y-(ZrB_(2))enhanced by long period stacking were studied by means of optical microscope,scanning electron microscope,XRD diffractometer,electronic universal testing machine and direct extrusion experiment in this work.The results show that the as-cast Mg94Zn2.5Y2.5 alloy is composed ofα-Mg matrix phase,block LPSO phase and network W phase.The addition of ZrB_(2)can refine the grain,promote the formation of LPSO phase and inhibit the precipitation of W phase.When the addition content of ZrB_(2)is 0.3wt.%,the alloy achieves the finest microstructure and the best mechanical properties.The grain size of alloy was refined from 42.6μm to 22.8μm,the yield strength increased from 131 MPa to 180 MPa,the tensile strength increased from 172 MPa to 225 MPa,and the elongation increased from 6.9%to 17.5%.After solid solution treatment and extrusion at different temperatures(350℃,400℃,450℃),it was found that the alloy exhibited the best mechanical properties after extrusion at 350℃,the yield strength was 305 MPa,the tensile strength was 358 MPa,and the elongation was 21%.

关 键 词：镁合金 长周期堆垛有序结构 正挤压 ZrB_(2) 

分 类 号：TG146.2[一般工业技术—材料科学与工程]