应用化学2026，Vol.43Issue(9)：1444-1458,15.DOI:10.19894/j.issn.1000-0518.260131
钐添加对挤压态Mg-9Gd-0.5Zr合金动态再结晶的抑制及时效析出的促进作用
Suppressing Dynamic Recrystallization and Promoting Aging Precipitation of Sm Additions in an Extruded Mg-9Gd-0.5Zr Alloy
摘要
Abstract
The effects of samarium(Sm)additions(mass fraction,0%,1%,and 2%)on the microstructures and mechanical properties of as-extruded Mg-9Gd-0.5Zr alloys were systematically investigated using methods including scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),and tensile testing.The results show that all three alloys exhibit a bimodal microstructure.Sm addition weakened the texture intensity of the<01-10>orientation in non-recrystallized regions,effectively suppressed dynamic recrystallization(DRX),and caused the volume fraction of DRXed regions to gradually decrease with increasing Sm content.Specifically,the volume fraction in the Mg-9Gd-2Sm-0.5Zr alloy decreased by 22.91%compared to the Sm-free alloy.Dynamic precipitates in DRXed regions,identified as the Mg5 RE phase by TEM characterization,were promoted in formation and growth by Sm addition.This altered the nucleation sites of precipitates in peak-aged non-recrystallized regions,increasing their number density and aspect ratio.Mechanically,Sm addition enhanced the yield strength of as-extruded samples.The Mg-9Gd-1Sm-0.5Zr alloy exhibited the best performance,with a tensile yield strength(TYS)of 446 MPa and a tensile elongation to fracture(TEL)of 6.98%.The study confirmed that the yield strength of the Mg-9Gd-0.5Zr and Mg-9Gd-1Sm-0.5Zr alloys primarily originated from the combined strengthening effects of precipitation strengthening and grain refinement strengthening.关键词
镁合金/稀土合金化/显微组织/动态再结晶/强化机制Key words
Magnesium alloys/Rare earth alloying/Microstructures/Dynamic recrystallization/Strengthening mechanisms分类
化学化工引用本文复制引用
古浩,杨强,赵东月,邱鑫,张景怀..钐添加对挤压态Mg-9Gd-0.5Zr合金动态再结晶的抑制及时效析出的促进作用[J].应用化学,2026,43(9):1444-1458,15.基金项目
吉林省科技发展计划项目(No.20260201104GX)、国家自然科学基金项目(No.U23A20128)和中国科学院青年促进会(No.2023234)资助 Supported by the Scientific and Technological Developing Scheme of Jilin Province(No.2026021104GX),the National Natural Science Foundation of China under grants(No.U23A20128)and the Chinese Academy of Sciences Youth Innovation Promotion Association(No.2023234) （No.20260201104GX）
