摘要
采用光学金相显微镜(OM)、X射线衍射(XRD)、拉伸试验机和扫描电子显微镜(SEM)等,研究了大应变轧制ZK60镁合金在不同热处理条件下的微观组织和力学性能。结果表明:在不同热处理下,T5态的第二相分布比T6态密集和细小,T5态晶粒尺寸小于T6态晶粒尺寸。随着时效的进行,晶粒大小基本不变,第二相呈增加趋势,并在晶界处粗化。由硬度和室温拉伸试验表明,晶粒细小和第二相析出物细密有利于提高材料的力学性能,因此,T5态的力学性能普遍高于T6态的,170℃时效的力学性能普遍高于190℃时效的,但是随着第二相的增加和粗化,伸长率呈减少的趋势。对比可知,T5态170℃/12 h热处理可获得最佳结合的强度和伸长率。
The microstructure and mechanical properties of ZK60 magnesium alloy rolled by large strain under different heat treatment condition were studied by optical metallography(OM),X-ray diffraction(XRD),tensile testing machine and scanning electron microscope(SEM).The results show that under different heat treatment,the second phase distribution of T5 states isdenser and finer than that of T6 state and T5 state grain size is smaller than that of T6 state grain size,along with the aging,grain size is basicalloy the same,the second phase increased,and at the grain boundary coarsening,the hardness and tensile test at room temperature shows that fine grain fine and second phase separation material is beneficial to increase mechanical properties of the material,so the mechanical properties of T5 state general higher than T6 state,the mechanical properties of 170℃ageing is generally higher than 190℃ageing,but with the increase and coarsening of the second phase,elongation hase decreasing trend.T5170℃/12 h is considered to be the best heat treatment for obtaining a good combination of strength and elongation.
作者
冯旭辉
孙有平
何江美
万斯雨
FENG Xuhui;SUN Youping;HE Jiangmei;WAN Siyu(School of Mechanical Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处
《热加工工艺》
北大核心
2021年第22期149-152,158,共5页
Hot Working Technology
基金
广西自然科学基金项目(2016GXNSFDA380008)
柳州市科学研究与技术开发计划项目(2017BD20301)。
关键词
镁合金
热处理
第二相
力学性能
伸长率
magnesium alloy
heat treatment
second phase
mechanical properties
elongation
