Nd、Ca复合添加对铸态Mg-Gd-Zr合金组织及力学性能的影响
Effect of Addition of Nd and Ca on Microstructure and Mechanical Properties of As-cast Mg-Gd-Zr Alloy
宋蕾 1刘彪彪 2李越 2王建 1张全福 1任乃栋 1武维康 1王红霞2
作者信息
- 1. 孝义市东义镁业有限公司,山西孝义 032308
- 2. 太原理工大学材料科学与工程学院,太原 030024
- 折叠
摘要
采用金属型铸造法制备了 Mg-6Gd-0.5Zr 合金(GK60)、Mg-4Gd-2Nd-0.5Zr(GNK420)合金和 Mg-4Gd-1Nd-1Ca-0.5Zr(GNXK4110)合金,研究了 Mg-6Gd-0.5Zr合金中Nd替代Gd元素,Nd、Ca复合添加替代Gd元素对合金组织和力学性能的影响.结果表明:元素总量一定时,随着合金元素种类的增多,合金晶粒尺寸显著减小,平均晶粒尺寸从GK60合金的114.59 μm减小到GNK420合金的102.69μm和GNXK4110合金的79.51μm;第二相由Mg5Gd相和Mg3Gd相演变到Mg5(Gd,Nd)相,再到Mg7(Gd,Nd,Ca)相,第二相数量显著增多.由于晶粒细化及第二相的强化作用使得三种合金的屈服强度和抗拉强度逐渐提高,而伸长率先降后升,GNXK4110合金力学性能最好,屈服强度和抗拉强度分别达到98.36 MPa和162.5 MPa,伸长率达到 7.97％.
Abstract
Mg-6Gd-0.5Zr alloy(GK60),Mg-4Gd-2Nd-0.5Zr alloy(GNK420)and Mg-4Gd-1Nd-1Ca-0.5Zr alloy(GNXK4110)were prepared by the metal mould casting method.The effects of Nd replacing Gd element and simultaneous substitution of Nd and Ca elements for Gd elements in Mg-6Gd-0.5Zr alloy on the microstructure and mechanical properties of the alloy were investigated.The results reveal that the grain size of the alloy decreased significantly with the variety of alloy elements when the total amount of elements is constant.The average grain size decreased from 114.59 μm in GK60 alloy to 102.69 μm in GNK420 alloy and 79.51 μm in GNXK4110.The second phase evolved from Mg5Gd and Mg3Gd to Mg5(Gd,Nd)and then to Mg7(Gd,Nd,Ca).Meanwhile,the number of the second phase increased significantly.The yield strength(YS)and ultimate tensile strength(UTS)of the three alloys increase gradually due to grain refinement and second phase strengthening,while the elongation(EL)first decreases and then increases.The GNXK4110 alloy obtained the best mechanical properties,the YS and UTS reached 98.36 MPa and 162.5 MPa,respectively,and the EL reached 7.97％.
关键词
镁合金/复合添加/晶粒尺寸/第二相/力学性能Key words
magnesium alloy/composite addition/grain size/second phase/mechanical property引用本文复制引用
基金项目
山西省科技成果转化引导专项(202204021301009)
山西省科技成果转化引导专项(202104021301022)
山西省自然科学基金(20210302123135)
山西省自然科学基金(20210302123163)
中央引导地方科技发展资金项目(YDZJSX20231B003)
出版年
2024
NETL
NSTL
维普
万方数据