首页|Zr对铸态Mg-6Bi合金微观组织和力学性能的影响

Zr对铸态Mg-6Bi合金微观组织和力学性能的影响

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  • 国家科技期刊平台
  • NETL
  • NSTL
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为探清Zr元素对Mg-6Bi合金微观组织与力学性能的影响规律，制备了铸态Mg-6Bi-xZr(x=0，0。5，1。0wt。％)合金，采用SEM、EDS、XRD和电子力学试验机等仪器设备对其微观组织和力学性能进行表征和测试。试验结果表明，铸态Mg-6Bi合金微观组织中树枝晶平均尺寸约为(302±46)μm，且晶界处存在大量尺寸在1～90。12 μm之间的Mg3Bi2相。采用0。5％～1。0％Zr元素合金化不但可以显著细化Mg-6Bi合金晶粒组织，还对合金中的Mg3Bi2相有显著地变质效果。其中，Mg-6Bi-1Zr合金平均晶粒尺寸为(128±65)μm，Mg3Bi2相尺寸在1～28。33μm之间，较Mg-6Bi合金均有显著细化。归因于晶界强化和第二相强化效果的增强，以及Mg3Bi2相对基体割裂作用显著削弱，铸态Mg-6Bi合金的强度和塑性均随着Zr元素含量的增加而显著提升。
Effects of Zr on the Microstructure and Mechanical Properties of As-Cast Mg-6Bi Alloy
In order to reveal the influence of Zr alloying on the microstructure and mechanical properties of Mg-6Bi alloy,as-cast Mg-6Bi-xZr(x=0,0.5,1.0 wt.％)alloys were prepared,and their microstructure and mechanical properties were characterized and tested by SEM,EDS,XRD and electronic mechanical performance testing machine.The experimental results showed that the average grain size of the as-cast Mg-6Bi alloy microstructure was about(302±46)μm,and there were a large number of Mg3Bi2 phase with a size between(l-90.12)pm at the grain boundary.The 0.5％-1.0％Zr element alloying can not only significantly refine the grain structure of Mg-6Bi alloy,but also has a significant refinement effect on the Mg3Bi2 phase in the alloy.Among them,the average grain size of Mg-6Bi-lZr alloy was(128±65)pm,and the phase size of the Mg3Bi2 was between(1-28.33)pm.Both the strength and the ductility of as-cast Mg-6Bi alloy significantly increased with the increase of Zr element content,due to the enhancement of grain boundary strengthening and second phase strengthening effects,as well as the significant weakened cleavage effect original from coarse Mg3Bi2 particles.

magnesium alloyZr elementmicrostructuremechanical properties

孟帅举、肖浩然、刘浩、王孟璐、张凤霞、张婧婧、刘海峰

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兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州 730050

兰州理工大学温州泵阀工程研究院,浙江温州 325000

中信戴卡股份有限公司,河北秦皇岛 066011

镁合金 Zr元素 显微组织 力学性能

甘肃省科技重大专项国家自然科学基金甘肃省高等学校创新项目中国博士后科学基金甘肃省青年科技基金计划温州市级科技计划项目兰州理工大学红柳优秀青年基金人才支持计划

22ZD6GA008522650482022A-0252022M71365621JR7RA261G2023018062205

2024

铸造
沈阳铸造研究所 中国机械工程学会铸造分会

铸造

CSTPCD
影响因子：0.499
ISSN：1001-4977
年,卷(期)：2024.73(8)