铸造2025，Vol.74Issue(10)：1366-1372,7.
热处理对Al7Si0.3Mg0.3Sc合金微观组织及力学性能的影响
Effect of Heat Treatment on the Microstructure and Mechanical Properties of Al7Si0.3Mg0.3Sc Alloy
摘要
Abstract
In this paper,the microstructure of Al7Si0.3Mg0.3Sc alloy before and after heat treatment was characterized using a differential thermal analyzer(DSC),scanning electron microscope(SEM)and transmission electron microscopy(TEM),and its mechanical properties were tested.The results show that after solution treatment,the α-Al+Si eutectic microstructure region in the experimental alloy narrows.And with the increase of solution temperature,the eutectic Si showed a trend of transformation from lamellar to granular.A large number of fine dispersed Al3Sc particles and lamellar Mg2Si were precipitated in the T6 state alloy,which inhibited the dislocation movement and thus strengthened the mechanical properties of the alloy.Among them,the position relationship between Al3Sc and α-Al with L12 structure was(100)Al3Sc//(200)α-Al,in addition,the smaller size of Mg2Si mainly precipitates and grew along the direction of<111>,while the larger size of Mg2Si mainly precipitates and grows in the direction of<200>.The optimal heat treatment system of experimental alloy was:530 ℃ solution treatment for 6 h+160 ℃ aging treatment for 10 h,under this condition the hardness,tensile strength and elongation were significantly improved compared with the as cast alloy.关键词
Al-Si-Mg合金/稀土Sc/热处理/微观组织/力学性能Key words
Al-Si-Mg alloy/rare earth Sc/heat treatment/microstructure/mechanical properties分类
金属材料引用本文复制引用
刘向前,崔晓明,王振旺,石博,赵学平,孙东旭,白朴存..热处理对Al7Si0.3Mg0.3Sc合金微观组织及力学性能的影响[J].铸造,2025,74(10):1366-1372,7.基金项目
内蒙古自治区直属高校基本科研业务费项目(项目号ZTY2023048,JY20240011,JY20220171)内蒙古自治区重点研发和成果转化计划项目:(2023YFHH0045) （项目号ZTY2023048,JY20240011,JY20220171）
内蒙古自然科学基金:(2023LHMS05015) （2023LHMS05015）
内蒙古科技计划项目(201802029) （201802029）
内蒙古自治区科技重大专项(zdzx2018031). （zdzx2018031）
