稀土Y对AZ61镁合金微观组织和力学性能的影响  

Effect of Y on Microstructures and Mmechanical Properties of AZ61 Magnesium

作　　者：王荣贵 张代东[2] 康云[2] 宫长伟[2] 

机构地区：[1]山西省冶金研究所,山西太原030001 [2]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《铸造设备研究》2009年第3期33-35,共3页Research Studies On Foundry Equipment

基　　金：山西省科技攻关计划项目(051125-4)

摘　　要：研究了稀土钇含量对AZ61镁合金显微组织和室温及高温力学性能的影响。实验结果表明:加入稀土钇可使AZ61合金铸态组织中的β相数量减少、铸态晶粒细化;大部分钇与铝结合生成高熔点、高热稳定性的稀土相Al2Y3;固溶处理后,β相完全溶解而稀土相则以块状或杆状存在于晶界周围;适量的稀土钇可以提高AZ61合金的室温及高温强度、硬度和延伸率;而过量的稀土钇则会导致AZ61合金的性能下降;稀土钇的含量为1.0%时合金可得到较佳的力学性能。The effects of different content of yttrium on the microstructure and high temperature and room temperature mechanical properties of of AZ61 magnesium alloy were investigated. The results show that after adding rare earth Y, 13 phases of AZ61 as-cast alloy decreases and the grains are refined remarkably. Most of Y reacts with aluminum to produce Al2Y3 compounds with high melting point and high thermal stability. With defined amount of Y addition, the strength and the hardness and the elongation of AZ61 magnesium alloy are improved at room-temperature and high-temperature, whereas the excess amount of Y addition will lead to decrease the performance. In this experiment, the mechanical tests indicate that AZ61 magnesium alloy has the best properties when the content of Y is 1.0 wt %.

关 键 词：AZ61镁合金 稀土Y 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]