稀土Y对AZ61镁合金微观组织和力学性能的影响.pdfVIP

学兔兔 2009年第3期 铸 造 设 备 与 工 艺 2009年 6月 FOUNDRY EQUIPMENT AND TECHNOLOGY Jun．2009 No3 · 试验研究· 稀土Y对AZ61镁合金微观组织和力学性能的影响 王荣贵 ，张代东 ，康 云z，宫长伟 (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) 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争l生能的影响。实验结果表明：加入稀 土钇可使AZ61合金铸态组织中的B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A12Y3；固溶处理后，p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．O％时合金可得到较佳的力学性能。 关键词：AZ61镁合金；稀土Y：显微组织；力学性能 中图分类号：TG146．2 文献标识码：A 文章编号：1674—6694(2009)03—0033—03 Effect of Y on Mjcrostructures and Mmechanical Properties of AZ61 Magnesium WANG Rong-guil,ZHANG Dai-donf,KANG Yun~,GONG Chang-wei (1．Shanxi Metallurgy Institute，Taiyuan Shanxi 030001，China；2．School ofM~edals Science and Engineering，T~dyuan UniversityofScience and Technology，Taiyuan Shanxi 030024，China) Abstract：The effects of different content of yttrium on the microstmcture and high temperature and loom temperature mechanical properties of of AZ61 magnesium alloy were investigated．The results show that after adding mre each Y，B phases of AZ61 as—cast alloy decreases and the grains are refined remarkably．Most of Y reacts with aluminum to produce A12Y3 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 ofY is 1．0 wt％． Key words：AZ61