挤压铸造准晶增强AZ91D镁基复合材料组织与性能（英文）  

Microstructure and Mechanical Properties of Squeeze Casting Quasicrystal Reinforced AZ91D Magnesium Matrix Composites

作　　者：杨玲[1] 侯华[1] 赵宇宏[1] 杨晓敏[1] 

机构地区：[1]中北大学,山西太原030051

出　　处：《稀有金属材料与工程》2016年第8期1978-1982,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51204147,51274175);the International Cooperation Program from the Ministry of Science and Technology of China(2011DFA50520,2014DFA50320);the Foundation for Graduate Students of Shanxi Province(20123088)

摘　　要：为了改善AZ91D镁合金的性能,采用挤压铸造法制备了Mg-Zn-Y准晶中间合金增强AZ91D镁基复合材料,研究了准晶中间合金含量对复合材料组织和性能的影响。结果表明挤压铸造工艺可以有效细化晶粒,复合材料的显微组织主要由α-Mg基体、晶界上分布的β-Mg_(17)Al_(12)相以及Mg_3Zn_6Y准晶颗粒组成,准晶颗粒和α-Mg基体之间形成稳定结合。当准晶中间合金含量为5%时,抗拉强度和断后伸长率达到最大值,分别为194.3 MPa和9.2%。复合材料的强化机制为细晶强化和准晶颗粒强化。To improve the mechanical properties of AZ91D alloy,a squeeze casting process was employed to fabricate AZ91D magnesium matrix composites reinforced with stable icosahedral quasicrystal particles which were introduced as Mg-Zn-Y quasicrystal master alloy.The effects of quasicrystal master alloy content on the microstructure and mechanical properties of the composites were investigated.The results show that the squeeze casting process is an effective method to refine grain size.The composites comprise α-Mg matrix,β-Mg_（17）Al_（12） phases that disperse on grain boundaries and Mg_3Zn_6Y quasicrystal particles.A stable interface between the quasicrystal particles and the Mg matrix is observed.The composite exhibits the maximum ultimate tensile strength of 194.3 MPa and the maximum elongation of 9.2%,when the mass fraction of quasicrystal master alloy is 5%.The reinforcement mechanism is concluded as fine-grain strengthening and quasicrystal particle strengthening.

关 键 词：镁基复合材料 挤压铸造 准晶 显微组织 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]