Al-7Si-0.3Mg-0.3Y合金热处理工艺及性能研究  

Heat Treatment Process and Properties of Al-7Si-0.3Mg-0.3Y Alloy

作　　者：周晓轩 白朴存[1] 侯小虎[1] 花雨豪 刘飞[1,2] ZHOU Xiaoxuan;BAI Pucun;HOU Xiaohu;HUA Yuhao;LIU Fei(College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051;Binzhou Bohai Piston Co.,Ltd.,Binzhou 256602)

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]滨州渤海活塞有限公司,滨州256602

出　　处：《特种铸造及有色合金》2025年第1期52-58,共7页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(62264013);内蒙古自治区科技重大专项资助项目(zdzx2018031);内蒙古自治区自然科学基金资助项目(2023LHMS01013,2022FX06);内蒙古自治区直属高校基本科研业务费资助项目(JY20220144,JY20220184)。

摘　　要：为了提高铸造Al-7Si-0.3Mg-0.3Y合金的力学性能,对其进行热处理,然后通过扫描电镜、维氏硬度仪等设备研究最佳热处理工艺,并分析铸态、T5态、T6态合金的力学性能。结果表明,最佳固溶工艺为530℃×6 h,此时共晶Si尺寸最小且形貌较为圆润,固溶时间超过6 h时,共晶Si开始粗化;与铸态相比,T5态合金的抗拉强度提高了26.7%,伸长率提高了28.5%;最佳时效工艺为160℃×11.5 h,此时合金硬度达到峰值,与铸态合金相比抗拉强度提高了31.1%,伸长率提高了49.7%。因此,合金最佳热处理工艺为530℃×6 h+160℃×11.5 h。Heat treatment was carried out to improve the mechanical properties of cast Al-7Si-0.3Mg-0.3Y alloy.The optimal heat treatment process was explored by scanning electron microscope,Vickers hardness tester and other equip⁃ments,and the mechanical properties of alloys in as-cast,T5 and T6 states were analyzed.The results indicate that the optimal solid solution process is 530℃×6 h,where the size of eutectic Si reaches the minimun value with rela⁃tively round morphology.When the solid solution time exceeds 6 h,the eutectic Si is coarsened.The tensile strength and elongation of the alloy are increased by 26.7%and 28.5%,respectively,compared with that of ones in as-cast state.The optimum aging process is 160℃×11.5 h,where hardness of the alloy reaches the peak value,and the ten⁃sile strength and elongation are increased by 31.1%and 49.7%,respectively.Therefore,the heat treatment process of the alloy is 530℃×6 h solid solution+160℃×11.5 h aging.

关 键 词：AL-SI合金 固溶 时效 Y元素 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]