摘要
本文运用OM、XRD、SEM与电子万能拉伸试验机初步研究了热挤压镁合金Mg-9Al-1Zn-0.5RE-x Cu(x=0,1,3,4)的显微组织和力学性能。镁合金Mg-9Al-1Zn-0.5RE中Cu元素的加入细化了其基体组织,β-Mg_(17)Al_(12)相由网状变为不连续、弥散分布的小块状和颗粒状。随着Cu元素质量分数的增加,β-Mg_(17)Al_(12)相含量减少,合金中先后出现第二相A_(l2)Cu和AlCuMg.与不加Cu元素时相比,Mg-9Al-1Zn-0.5RE-xCu(x=1,3,4)合金的室温抗拉强度、屈服强度明显升高,而伸长率显著降低;Cu含量的多少,对合金的室温抗拉强度和屈服强度影响不大,而随着Cu含量的增加,合金的塑性逐渐有所改善。在本次实验中,当Cu质量分数为4%时,合金的抗拉强度最高,为287.33 MPa,伸长率为15.2%,综合力学性能最好。
The microstructure and mechanical properties of hot extruded magnesium alloy Mg-9Al -1Zn -0.5RE-x Cu （x = 0 , 1 , 3 ,4 ） were primarily studied by means of OM, X RD, SEM and electronic universal tensile testing machine.The addition of Cu in magnesium alloy Mg-9Al-1Zn-0.5RE refined its matrix structure , and the phase of β-Mg（17）Al（12） changed from network to discontinuous and dispersed blocky and granular structure.With the increase of mass fraction of Cu , the content of β-Mg（17）Al（12） phase decreases , and the second phase AeCu and AlCuMg ap p ea r successively in the alloy.Compared with the alloy without Cu , the tensile strength at room temperature of Mg-9Al-1Zn-0.5RE-xCu（x=1 , 3, 4 ） alloy increased obviously.Its yield strength increased and its elongation decreased significantly.The content of Cu had little effect on the tensile strength and yield strength of the alloy at room temperature.With the increase of Cu content , the plasticity of the alloy gradually was improved.Finally , when the content of Cu was 4% , the tensile strength of the alloy was the highes t, which was 287.33 MPa , and the elongation was 15.2%.The comprehensive mechanical properties were the best.
作者
刘江江
曾涛
何新泽
龚胡念
房大庆
LIU Jiang-jiang;ZENG Tao;HE Xin-ze;GONG Hu-nian;FANG Da-qing(Taiyuan University o f Science and Technology, Taiyuan Shanxi 030024, Chin)
出处
《铸造设备与工艺》
2018年第2期44-47,共4页
Foundry Equipment & Technology
基金
山西省高等学校大学生创新创业训练项目(2017293)
山西省回国留学项目(2017082)
太原科技大学大学生创新创业训练项目(XJ2016083)
材料科学与工程特色专业建设/省教育厅/2011/2
