镁基准晶对AZ31镁合金显微组织和力学性能的影响.pdfVIP

学兔兔 Jun．2009 铸 造 V01．58 NO．6 FOUNDRY ·555· 镁基准晶对AZ31镁合金显微组织和力学性能的影响 杜二玲-，王荣贵z，张金山 ，许春香’，王红霞 ，周翠兰 (1．太原理工大学材料科学与工程学院，山西太原030024；2．山西省冶金研究所，山西太原030001) 摘要：在常规铸造条件下，向AZ3l合金熔体中加入适量 Mg-Zn—Y—Mn准晶中间合金获得准晶增强的AZ31合金材料。 通过XRD、SEM、EDS以及拉伸试验等研究了Mg．Zn．Y．Mn准晶中间合金加入量对AZ31合金组织与性能的影响。结果 表明：Mg．Zn．Y．Mn准晶中间合金的加入使基体组织得到细化，合金的力学性能得到提高。当加／L5％的中间合金时， 其宏观硬度为60．63HB．而拉伸强度达到峰值为179．16MPa，比原合金提高了32％。 关键词：准晶强化；AZ31镁合金；显微组织；拉伸性能 中图分类号：TG146．22 文献标识码：A 文章编号：100l一4977(2009)06—0555—04 Effect 0f Mg．Based Quasicrystals Addition on Microstructure and MechanicaI．Properties of Az3 1 Magnesium Alloy DU Er-ling’，WANG Rong—gui ，ZHANG Jin·shan’，XU Chun-xiang’， WANG Hong-xia’，ZHOU Cui-lan (1．College of Material Science＆Engineering，Taiyuan University of Technology，Taiyuan 030024， Shanxi，China；2．Shanxi Province Research Institute of Metallurgy，Taiyuan 030001，Shanxi，China) Abstract：Under normaI casting conditions，the AZ31 matrix alloy strengthened by quasicrystal was fabricated by adding Mg．Zn．Y．Mn quasicrystaI master alloy into the molten AZ31 alloy．The effects of Mg-Zn．Y．Mn master alloy on microstructure and mechanical properties of AZ31 matrix alloy were investigated by using of XRD，SEM，EDS and tensile test etc．The results show that the microstructures of matrix alloy were refined and its mechanical properties were improved a Iot with the introducing of Mg—Zn．、 Mn master alloy into AZ31 alloy．When the addition of Mg-Zn-Y-Mn master alloy was 5％．the macro．hardness of the alloy increased to 60．63 HB and its tensile strength could reach the highest values of 1 79．1 6 MPa．which was lmproved 32％than the Az31 magnesium alloy． Key wo