摘要
通过组织观察和分析,结合室温和高温拉伸试验,研究了加入质量分数为1%～4%Gd对镁合金AZ81显微组织和力学性能的影响。研究结果表明:加入适量的稀土元素Gd,可使AZ81合金的晶粒得到细化,减少β(Mg17Al12)相的数量,同时生成高熔点的粒状化合物Al2Gd相,从而改善合金的显微组织。随着Gd含量的增加,在室温(25℃)和高温(150℃)下,AZ81合金的抗拉强度和伸长率均先升高后降低,且在Gd质量分数为3%时取得最大值,抗拉强度分别为260 MPa和212 MPa。
Through microstructure analysis and tensile tests at room and high temperature,the microstructure and mechanical properties of magnesium alloy AZ81 with 1%～4%(mass fraction)Gd addition were studied.The results show that proper content of rare earth element Gd addition can refine the grain size,and decreases the amount of β(Mg17Al12) phase.Meanwhile,the granular Al2Gd phases with high melting point are formed,and the microstructure of AZ81 alloy is improved.With the increase of Gd addition,the tensile strength and elongation of AZ81 alloy at room temperature(25 ℃) and high temperature(150 ℃) increase at first and then decrease.The maximum values of the tensile strength with 3%Gd are 280 MPa at 25 ℃ and 212 MPa at 150 ℃,respectively.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2012年第5期15-18,5,共4页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(51171059)
河南省杰出人才计划基金项目(084200510018)
河南省基础与前沿技术研究计划基金项目(102300410018)
河南省高校科技创新团队支持计划基金项目(2012IRTSTHN008)
关键词
镁合金AZ81
GD
显微组织
力学性能
Magnesium alloy AZ81
Gd
Microstructure
Mechanical properties
