摘要
研究了Ce、Sr和La对AZ91镁合金显微组织和力学性能的影响。结果表明,复合添加Ce、Sr、La可显著细化镁合金铸态组织,使呈网状分布的β-Mg17Al12相断裂成块状或粒状,均匀分布在基体中,并在合金组织中生成杆状或者针状的Al4Ce和Al4La相。复合添加0.5%Ce-0.3%La-0.2%Sr的镁合金显微组织最佳,并且抗拉强度达到了270 MPa,伸长率达到了7.75%。
The effect of Ce, Sr and La on the microstructures and mechanical properties of the alloy AZ91 was investigated. The results show that Ce, Sr and La can refine the as-cast microstructure of AZ91 alloy remarkably. The morphology of/3-Mg17Al12 phase transforms from a net shape to a bulk and granular shape, andβ-Mg17Al12 phase distributes in the matrix of the alloy AZ9i uniformly. In addition, some bacillifoim or acicular Al4Ce and Al4La phases appear in the alloy AZ91. The microstructure is optimal when adding 0.5wt.% Ce, 0.2wt.% Sr and 0.3wt.% La simultaneously, and the tensile strength and elongation of the alloy AZ91 achieve 270 MPa and 7.75% respectively.
出处
《铸造技术》
CAS
北大核心
2015年第2期276-278,共3页
Foundry Technology
