高性能Al-Si-Cu-Mg铸造合金成分和热处理工艺设计  

Design of the Composition and Heat Treatment Process of High-Performance Al-Si-Cu-Mg Cast Alloy

作　　者：熊俊杰 冯志军 李宇飞 李泽华 李笑 常博文 王光东 杨继伟 XIONG Jun-jie;FENG Zhi-jun;LI Yu-fei;LI Ze-hua;LI Xiao;CHANG Bo-wen;WANGGuang-dong;YANG Ji-wei(National Key Laboratory of Advanced Casting Technologies,Shenyang 110022,Liaoning,China;Shenyang Foundry Research Institute Co.,Ltd.,CAM,Shenyang 110022,Liaoning,China;Dalian Huarui Heavy Industry Casting Co.,Ltd.,Dalian 116000,Liaoning,China;Shenyang Research Casting Technology Co.,Ltd.,Shenyang 110141,Liaoning,China;School of Materials Science&Engineering,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]高端装备铸造技术全国重点实验室,辽宁沈阳110022 [2]中国机械总院集团沈阳铸造研究所有限公司,辽宁沈阳110022 [3]大连华锐重工铸业有限公司,辽宁大连116300 [4]沈阳铸研科技有限公司,辽宁沈阳110141 [5]东北大学材料科学与工程学院,辽宁沈阳110819

出　　处：《铸造》2023年第6期680-687,共8页Foundry

基　　金：辽宁省科技计划项目国家风电传动及控制工程技术研究中心联合开放基金(2021-KF-15-03)。

摘　　要：为开发新型高性能铸造合金,采用材料热力学计算合金设计方法建立了Cu、Mg元素含量与θ-Al2Cu、Q相含量和形成温度的变化关系图、Al-9Si-2Cu-xMg合金平衡相图及析出强化相含量随温度和时间的变化曲线,结合DSC热分析实验设计了合金成分和热处理工艺。结果表明:利用材料热力学计算合金设计方法指导设计Al-Si-Cu-Mg合金成分和热处理工艺具有准确性和高效性,提高了新合金研发效率并降低了研发成本;设计的合金成分满足关系式:9.5≤Cu+20.4Mg≤10.7,且1.5%≤Cu≤2.5%,0.35%≤Mg≤0.45%,合金热处理工艺为500℃×3 h+530℃×9 h淬火+155℃×12 h;热处理后Al-9Si-2Cu-0.4Mg合金室温力学性能平均值为Rm=401 MPa、Rp0.2=302 MPa,A=5.3%,力学性能参数达到高性能铸造铝合金的性能水平。In the interests of pursuing the development of new high-performance cast alloys,the relationship between Cu,Mg element content andθ-Al2Cu,Q phase content and formation temperature,the equilibrium phase diagram of Al-9Si-2Cu-xMg alloy and the variation curves of precipitated strengthening phase content with temperature and time were established by thermodynamic calculation of materials.Combined with DSC thermal analysis experiment,the alloy composition and heat treatment process of the Al-Si-Cu-Mg alloy were designed.The results showed that it was accurate and efficient to design the composition and heat treatment process of the Al-Si-Cu-Mg alloy by thermodynamic calculation of the materials,which improved the efficiency and reduced the cost of developing new alloys.The composition satisfied the relationship:9.5≤Cu+20.4Mg≤10.7,and 1.5%≤Cu≤2.5%,and 0.35%≤Mg≤0.45%.The heat treatment process was 500℃×3 h+530℃×9 hWQ+155℃×12 h.Average ultimate tensile strength at room temperature was 401 MPa,yield strength was 302 MPa,and the elongation was 5.3%,which reached-the performance level of high performance cast aluminum alloy.

关 键 词：AL-SI-CU-MG合金 相图计算 热处理工艺 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]