热处理对砂铸Mg-Gd-Y合金组织和力学性能的影响  

Influence of Heat-treatment on Microstructure and Mechanical Properties of As-Cast Mg-Gd-Y by Sand Mold

作　　者：王其龙[1,2] 吴国华[1,2] 侯正全[3] 陈斌[3] 郑韫[1,2] 丁文江[1,2] 

机构地区：[1]上海交通大学轻合金精密成形国家工程研究中心,上海200030 [2]上海交通大学金属基复合材料国家重点试验室,上海200030 [3]上海航天精密机械研究所,上海201600

出　　处：《铸造》2009年第3期282-286,289,共6页Foundry

基　　金：国家973资助项目(2007CB613701);国家十一五科技支撑计划资助项目(2006BAE04B07-2);上海市优秀学科带头人计划(08XD14020)

摘　　要：研究了砂型差压铸造Mg-10Gd-3Y-Zr合金的固溶时效行为、微观组织和室温力学性能。结果表明,T4处理后的合金在225℃、250℃下的峰值时效时间分别为12h和10h,相对于金属型铸造条件下的峰值时效时间分别提前4h和6h。XRD衍射分析表明,T6处理后的合金主要由α-Mg和方块状γ相组成。研究还表明,同一时效条件下,随固溶时间延长,合金强度得到提高。与铸态情形相比,最佳热处理条件下合金的抗拉强度、屈服强度分别提高78.2%和52.1%。The solution-aging behavior, microstructure and mechanical properties of Mg-10Gd-3Y-Zr alloy under counter-pressture cast in sand mold were investigated. The results show that the peak-aged time of cast-T4 at 225 ℃, 250℃ are 12 h and 10 h, respectively. Compared with permanent mould, the peak.aged time is put ahead for 4 h and 6 h, respectively. The X-ray diffraction reveals that the cast-T6 alloy is consisted of a-Mg and diamond-shaped ）, phases. The results also show that under the same aging condition, prolonging the solution time can improve the strength. Compared with as-cast status, the UTS （Ultimate Tensile Strength） and TYS （Tensile Yield Strength） of the alloy with optimized heat treatment are increased by 78.2% and 52.1%, respectively.

关 键 词：MG-GD-Y合金 固溶时效 T6处理 

分 类 号：TG113[金属学及工艺—物理冶金]