铸造2025，Vol.74Issue(12)：1581-1589,9.
Mg-10Gd-0.3Nd-0.3Zn-0.5Zr高强镁合金大尺寸砂型铸件组织及力学性能
Microstructure and Mechanical Properties of High Strength Mg-10Gd-0.3Nd-0.3Zn-0.5Zr Alloy and Large-Sized Casting by Sand Mold
摘要
Abstract
With the continuous development of heavy-lift,high-load and lightweight requirements for aircraft case castings,there is an urgent need to explore high-performance cast magnesium alloys suitable for sand casting.In this project,the microstructure and mechanical properties of large-sized Mg-10Gd-0.3Nd-0.3Zn-0.5Zr alloy castings manufactured by using of sand molds were studied.The as-cast microstructures consist of fine primary equiaxed α-Mg phases and a small amount of Mg3(RE,Zn)phases.After solution treatment at 510℃,Mg3(RE,Zn)phases dissolve into the α-Mg matrix,the grain size increase,and LPSO phase form.The aging hardening curves within 175-250℃ were tested,and the optimal aging process was determined to be 225℃/16 h.The peak aging microstructure consists of fine β' and β1 phases uniformly distributed in the matrix,and the ultimate tensile strength,yield strength,and elongation can reach up to 328.9 MPa,213.0 MPa and 6.8％,respectively,which fully meet the service requirements of large-sized aircraft case castings with heavy-lift,high-load and lightweight.关键词
Mg-10Gd-0.3Nd-0.3Zn-0.5Zr合金/组织/热处理工艺/力学性能Key words
Mg-10Gd-0.5Nd-0.2Zn-0.5Zr alloy/microstructure/heat treatment/mechanical properties分类
矿业与冶金引用本文复制引用
王晓明,张根苗,康洪岩,蔡增辉,王志超,黄永江,宁志良..Mg-10Gd-0.3Nd-0.3Zn-0.5Zr高强镁合金大尺寸砂型铸件组织及力学性能[J].铸造,2025,74(12):1581-1589,9.基金项目
国防基础科研计划资助(JCKY2023213C003). （JCKY2023213C003）
