大型高强耐热镁合金构件的热处理工艺研究

Research on Heat Treatment Process of Large High Strength and Heat Resistant Magnesium Alloy Components

经过拉伸试验和微观组织观察,对合金成分为Mg-13Gd-4Y-2Zn-0.5Zr的大型高强耐热镁合金构件进行了性能与组织分析。结果显示,热处理工艺对改善其性能和微观组织有着显著的影响,在多种热处理工艺中确定了最佳的工艺参数组合:430℃×8h+225℃×16h。在此工艺条件下,合金内部发生了动态再结晶,晶粒明显细化,极大提高了其抗拉强度。随着时效增加,灰色LPSO相的数量逐渐增加,进一步增强了合金的力学性能;合金轴向抗拉强度为332MPa,延伸率为11.5%;环向抗拉强度为375MPa,延伸率为12.3,这些结果充分展示了镁合金在高温环境下的卓越力学性能和良好的耐热性。

Through tensile testing and microstructure observation,the performance and microstructure analysis of large highstrength and heat-resistant magnesium alloy components with Mg-13Gd-4Y-2Zn-0.5Zr alloy composition were carried out.The results showed that the heat treatment process had a significant impact on improving its performance and microstructure.The optimal process parameter combination was determined among various heat treatment processes:430℃×8h+225℃×16h.Under these process conditions,dynamic recrystallization occurred inside the alloy,resulting in significant grain refinement and greatly improving its tensile strength.As the aging increases,the number of gray LPSO phases gradually increases,further enhancing the mechanical properties of the alloy;The axial tensile strength of the alloy is 332MPa,and the elongation is 11.5%;The circumferential tensile strength is 375MPa and the elongation is 12.3,which fully demonstrates the excellent mechanical properties and good heat resistance of magnesium alloy in high-temperature environments.