摘要
采用光学显微镜、扫描电镜、X射线衍射仪(XRD)、透射电镜、纳米压痕测试仪和电子万能试验机等研究了B_(4)C对Mg_(94)Zn_(2.5)Y_(2.5)Mn_(1)合金组织和性能的影响。结果表明:铸态Mg_(94)Zn_(2.5)Y_(2.5)Mn_(1)合金主要由α-Mg、鱼骨状W相和块状18R LPSO相组成;适量B_(4)C的加入可以有效地细化合金的晶粒,促进LPSO相的形成,抑制W相的产生;当加入0.5 at%B_(4)C时,合金的显微组织和力学性能为最优,平均晶胞尺寸为20.7μm,LPSO相的体积分数为22.5%,抗拉强度为256 MPa,伸长率为8.6%。
Effect of B_(4)C on microstructure and mechanical properties of Mg_(94)Zn_(2.5)Y_(2.5)Mn_(1) alloy were investigated by means of optical microscope,scanning electron microscopy,X-ray diffraction(XRD),transmission electron microscopy,nano indentation tester and electronic universal testing machine.The results show that the microstructure of the as-cast Mg_(94)Zn_(2.5)Y_(2.5)Mn_(1) alloy is mainly composed of α-Mg,fish bone-like W phase and block 18R LPSO phase.The addition of an appropriate amount of B_(4)C can effectively refine the grains of the alloy,promote the formation of LPSO phase and inhibit the formation of W phase.When the addition content of B_(4)C is 0.5 at%,the microstructure and mechanical properties of the alloy are the best,the average cell size is 20.7μm,the volume fraction of LPSO phase is 22.3%,the tensile strength is 256 MPa,and the elongation is 8.6%.
作者
郝建强
张金山
许春香
王红霞
HAO Jian-qiang;ZHANG Jin-shan;XU Chun-xiang;WANG Hong-xia(Department of Mechanical Engineering,Jinzhong University,Jinzhong 030619,China;School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2021年第8期32-39,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51574175和51474153)
山西省高等学校科技创新项目(2020L0581)
晋中学院“1331”重点创新团队项目(jzxycxtd2019008)。
关键词
镁合金
长周期堆垛有序结构
微观组织
力学性能
magnesium alloy
long period stacking ordered structure
microstructure
mechanical property
