准晶Ⅰ-相增强Mg-Zn-Y-Zr合金组织与力学性能研究  

Microstructures and Mechanical Properties of Quasicrystal Reinforced Mg-Zn-Y-Zr Alloys

作　　者：卜志强[1] 鲁若鹏 马军 田晋忠 侯华[1] 赵宇宏[1] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]中北大学信息与通信工程学院,山西太原030051

出　　处：《铸造技术》2018年第2期271-275,共5页Foundry Technology

基　　金：国家自然科学基金(No.51774254,51774253,51701187,U1610123,51674226,51574207,51574206);山西省科技重大专项(MC2016-06)

摘　　要：采用普通凝固制备了准晶Ⅰ-相增强的Mg-Zn-Y-Zr合金。保持Zn/Y(at%)不变,通过Zn、Y含量变化研究准晶Ⅰ-相对合金铸态组织和力学性能的影响。结果表明,铸态合金由枝晶状α-Mg和枝晶间分布的Ⅰ-相以及层片状的α-Mg/I-phase共晶组织组成。随着Zn、Y含量的增加,合金中的准晶Ⅰ-相以及层片状α-Mg/I-phase共晶组织逐渐增多,但合金的晶粒尺寸明显减小;铸态合金的硬度和抗拉强度随Zn、Y含量的增加而增加,拉强度达到216 MPa,伸长率随Zn、Y含量的增加呈现出先上升后下降的趋势,拉伸断口为准解理断裂。Quasicrystal phase （I-phase） reinforced Mg-Zn-Y-Zr alloys were prepared by conventional solidification. The influence of Zn and Y content on the structure and mechanical properties of the as-cast alloy was studied with keeping Zn/Y （at%） ratio. The results show that the cast alloy is composed of the I-phase, laminar α-Mg/I-phase eutectic and α-Mg dendritic matrix. With the increase of Zn and Y content, the amorphous I-phase of the alloy and the lameUar α-Mg/I-phase eutectic gradually increase, but the grain size of the alloy decrease significantly. The hardness and tensile strength of as-cast alloys increase with the increase of the content of zinc and Y, the tensile strength is 216 MPa, the elongation with the increase of the content of zinc, Y show a downward trend after rising first, tensile fracture is cleavage fracture.

关 键 词：Mg-Zn-Y-Zr I-相:力学性能 

分 类 号：TG113[金属学及工艺—物理冶金] TG166.4[金属学及工艺—金属学]