Al-Ti-C中间合金对ZM-5镁合金显微组织及力学性能的影响  

Effects of Al-Ti-C Master Alloy on Microstructure and Mechanical Properties of ZM-5 Magnesium Alloy

作　　者：殷黎丽[1] 刘闯[2] 王涛[2] 翟虎[2] 张亚龙[2] 马志毅[2] 李玉胜[2] 

机构地区：[1]包头职业技术学院,内蒙古包头014030 [2]沈阳铸造研究所,辽宁沈阳110022

出　　处：《铸造》2010年第6期618-621,共4页Foundry

摘　　要：采用光学显微镜、X射线衍射仪、扫描电子显微镜等研究了Al-8Ti-2C中间合金对ZM-5合金显微组织及力学性能的影响,以及保温时间对合金力学性能的影响。结果表明:Al-8Ti-2C中间合金的主要相组成为Al4C3、TiC和α-Al,对ZM-5合金具有明显的细化效果。添加0.3%的Al-8Ti-2C中间合金时,细化效果最佳,α-Mg晶粒明显细化,平均晶粒尺寸由原来的124μm降低到约89μm;合金的综合力学性能最佳,其中抗拉强度和屈服强度分别比未变质的ZM-5合金提高了8.8%和24.2%,但伸长率提高幅度不大。此外,随着保温时间延长,ZM-5合金的力学性能先提高后降低。The optical microscope, X-ray diffractometer and scanning electron microscope were employed to study the effect of Al-8Ti-2C on microstructures and mechanical properties of ZM-5 magnesium alloy, and effect of holding time on mechanical properties of the alloy. The results show that AI-8Ti-2C master alloy consists of Al4C3, TiC and α-Al phases, and has a significant effect on the grain refinement of ZM-5 alloy. The optimum refinement can be obtained with 0.3% AI-8Ti-2C addition, and the average grain size of α-Mg reduces from 124 μm to 89 μm. The mechanical properties of ZM-5 alloy also reach optimum, the increment of tensile strength is 8.8%, and that of yield strength is 24.2%, but that of elongation is not obvious. In addition, the mechanical properties of ZM-5 alloy decrease after the first raise with the extension of holding time.

关 键 词：ZM-5合金 晶粒细化 显微组织 力学性能 保温时间 

分 类 号：TG146.21[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]