低溶质总量高强镁合金复杂铸件本体性能优化

陈舸; 肖旅; 董喜旺

doi:10.15980/j.tzzz.2020.08.001

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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
2020年40卷第8期页码：813-819
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.08.001

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[1]陈舸,肖旅,董喜旺.低溶质总量高强镁合金复杂铸件本体性能优化[J].特种铸造及有色合金,2020,40(08):813-819.

Chen Ge, Xiao Lü, Dong Xiwang. Performance Optimization of Magnesium Alloy Complex Castings with Low Solute Content and High Strength[J]. Special Casting & Nonferrous Alloys, 2020,40(8):813-819.
[1]陈舸,肖旅,董喜旺.低溶质总量高强镁合金复杂铸件本体性能优化[J].特种铸造及有色合金,2020,40(08):813-819. DOI： 10.15980/j.tzzz.2020.08.001.

Chen Ge, Xiao Lü, Dong Xiwang. Performance Optimization of Magnesium Alloy Complex Castings with Low Solute Content and High Strength[J]. Special Casting & Nonferrous Alloys, 2020,40(8):813-819. DOI： 10.15980/j.tzzz.2020.08.001.

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。

Abstract

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.