低溶质总量高强镁合金复杂铸件本体性能优化  

Performance Optimization of Magnesium Alloy Complex Castings with Low Solute Content and High Strength

作　　者：陈舸[1,2] 肖旅 董喜旺[1,2] Chen Ge;Xiao Lü;Dong Xiwang(Shanghai Aerospace Precision Machinery Institute;Shanghai Metal Materials Near-Net-Shape Engineering Research Center)

机构地区：[1]上海航天精密机械研究所,上海201600 [2]上海金属材料近净成形工程技术研究中心

出　　处：《特种铸造及有色合金》2020年第8期813-819,共7页Special Casting & Nonferrous Alloys

摘　　要：基于溶质总量控制开展Mg-RE系合金成分设计,筛选出抑制镁合金离异共晶相比例的元素,研究合金成分对铸造镁合金非平衡凝固组织、凝固区间、流动性、抗裂能力的影响,且基于筛选成分组织优化了热处理工艺。结果表明,在砂型慢冷条件下采用Mg-5.8Gd-3.0Y-0.4Zr制备的大型复杂结构件本体力学性能优异,抗拉强度≥300 MPa,屈服强度≥220 MPa,伸长率≥3%,可满足大型复杂结构件大载荷、大过载的使用工况。A composition design of Mg rare earth alloys based on the total solute control was carried out.By screening the elements to inhibit the eutectic phase content in magnesium alloys,the effects of alloy composition on the non-equilibrium solidification structure,solidification interval,fluidity and crack resistance of the cast magnesium alloy were investigated,and the heat treatment process was optimized.The results reveal that the large and complex structural parts prepared with Mg-5.8 Gd-3.0 Y-0.4 Zr under the slow cooling conditions of sand mold present excellent mechanical properties,where mechanical properties reach more than 300 MPa in tensile strength,more than 220 MPa in yield strength,and more than 3%in elongation,meeting the requirements for comprehensive strength and toughness of large and complex structures with heavy loads and overloads.

关 键 词：砂型铸造 离异共晶 铸造成形性 稀土镁合金 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG132.33[金属学及工艺—金属材料]