摘要
采用挤压铸造技术制备了不超过0.5%的Fe含量(质量分数,下同)的Al-5Mg-2Si-Mn合金,研究了不同Fe含量下的合金微观组织和力学性能。结果表明,在75 MPa压力下,Fe元素的加入首先生成Al_(15)(Fe,Mn)_(3)Si_(2),且Al1(5Fe,Mn)_(3)Si_(2)存在于最后凝固阶段的共晶区域。合金中Mg_(2)Si的平均层片间距随着Fe含量的增加而增加,主要原因是添加Fe后Mg_(2)Si的生长速度减缓。Mg_(2)Si层片间距显著影响合金的力学性能,合金的强度和伸长率随Mg_(2)Si层片间距的减小而增大。当Mg_(2)Si层片间距为0.9μm时,合金的抗拉强度、屈服强度和伸长率分别为276 MPa、177 MPa和9.6%。
Microstructures and mechanical properties of Al-5Mg-2Si-Mn alloys with Fe contents less than 0.5%(in mass fraction)fabricated by squeeze casting were analyzed by SEM,EDS and tensile testing.The results indicate that Fe addition leads to the initial formation of Al_(15)(Fe,Mn)_(3)Si_(2) under 75 MPa,which emerges in the eutectic region at final solidification stage.The interlamellar space of Mg_(2)Si in the alloys is increased with the increase of Fe content,which is mainly attributed to the retarding growth rate of Mg_(2)Si after Fe addition.The mechanical properties of the alloy are sig⁃nificantly affected by interlamellar space,and the strength and elongation of alloy are increased with the interlamellar space reduction of Mg_(2)Si.With Mg_(2)Si interlamellar space of 0.9μm,the tensile strength,yield strength and elongation of the alloy reach 276 MPa,177 MPa and 9.6%,respectively.
作者
李永圣
汤传尧
杨冬阳
陈静思
王智
刘乐华
张卫文
LI Yongsheng;TANG Chuanyao;YANG Dongyang;CHEN Jingsi;WANG Zhi;LIU Lehua;ZHANG Weiwen(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640)
出处
《特种铸造及有色合金》
北大核心
2025年第12期1898-1904,共7页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52074131)
广东省自然科学基金资助项目(2024A1515012542)。
