Fe含量对再生铝硅合金组织和性能的影响  

Effects of Fe Content on Microstructure and Properties of Secondary Al-Si Alloys

作　　者：于明轩 范超[2] 张骏 王太子 魏巍 唐清春[2] YUMingxuan;FANChao;ZHANGJun;WANGTaizi;WEIWei;TANGQingchun(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;School of Innovation and Entrepreneurship,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545006 [2]广西科技大学创新创业学院,广西柳州545006

出　　处：《热加工工艺》2024年第14期108-113,117,共7页Hot Working Technology

基　　金：国家自然科学基金资助项目(51864006,52165054);广西自然科学基金资助项目(2018GXNSFAA281273,2020GXNSFAA159142)。

摘　　要：利用金相显微镜、X射线衍射仪、万能拉伸试验机等研究了Fe含量对再生铝硅合金组织和性能的影响,并对该合金中富铁相形态进行了定量分析。结果表明:当Fe含量从0.796%增加到1.301%时,合金组织中二次枝晶臂间距先减小再增大再减小;富铁相形貌的演变过程为紧密汉字状→汉字状+鱼骨状→汉字状+鱼骨状+针状→针状+汉字状→针状;合金中的富铁相面积分数逐渐上涨,富铁相长度不断增长,尤其当Fe含量从1.022%上升到1.301%,针状β-Fe相长度显著增长,平均长度最长可达119.5μm;β-Fe相的出现导致合金力学性能的显著下降,当Fe含量增至1.301%时,合金抗拉强度和伸长率相比0.796%Fe时分别下降26.26%和52.58%。The effects of Fe content on the microstructure and properties of secondar Al-Si alloys were investigated by optical microscope,XRD and universal tensile testing machine,and quantitative analysis of the iron-rich phase morphology in the alloy.The results show that with the Fe content increasing from 0.796% to 1.301%,the secondary dendrite arm spacing in the alloy decreases,then increases and then decreases again.The morphology evolution sequence of iron-rich phase is as follows:compact Chinese script,Chinese script&fishbone-like,Chinese script&fishbone-like&needle-like,needle-like&Chinese script,needle-like;the area fraction of Fe-rich phase gradually increases and the length of Fe-rich phase grows,especially when the Fe content is in the range of 1.022%-1.301%,the length of needle-like β-Fe phase increases significantly,with the longest average length up to 119.5μm;the appearance of β-Fe phase leads to a sharp decrease in the mechanical properties of the alloy.When Fe content increases to 1.301%,the tensile strength and elongation of the alloy decrease by 26.26% and 52.58%,respectively,compared with that of 0.796%Fe.

关 键 词：Fe含量 再生铝硅合金 富铁相 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]