Zr含量对Er变质Al7Si0.3Mg合金组织及力学性能的影响  

Effect of Zr Content on Microstructure and Mechanical Properties of Er Modified Al7Si0.3Mg Alloy

作　　者：李玉章 孙彦华 吉全鑫 冯炜光 李雨耕 包稚群 LI Yuzhang;SUN Yanhua;JI Quanxin;FENG Weiguang;LI Yugeng;BAO Zhiqun(Kunming Metallurgy Research Institute,Kunming 650031,China;State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals,Kunming 650031,China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明冶金研究院有限公司,昆明650031 [2]有色金属强化冶金新技术国家重点实验室,昆明650031 [3]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《有色金属工程》2024年第3期27-33,81,共8页Nonferrous Metals Engineering

基　　金：云南省重大科技专项计划资助项目(202102AB080015,202102AB080004,202202AB080006)。

摘　　要：在含0.3%Er的Al7Si0.3Mg合金中添加Zr,通过光学显微镜(OM)及扫描电子显微镜(SEM)对试样的显微组织进行表征,用高分辨X射线衍射仪(XRD)进行物相组成分析,并测试其力学性能,研究不同含量的Zr对合金微观组织形貌以及力学性能的影响。结果表明,添加Zr元素后,Zr与Er形成了第二相颗粒Al3Er和Al3Zr,这些第二相粒子在铝液凝固过程中起到双重形核和细化作用,显著细化α-Al和共晶Si的分枝,提高了合金的力学性能。但若Zr添加过多,则会和Er在合金内部形成过多的金属间化合物,削弱变质效果,引起抗拉强度和延伸率下降。Zr含量为0.2%时效果最好,其抗拉强度达到182 MPa,伸长率为6.4%,较未添加Zr元素的合金抗拉强度和伸长率分别提高了16.7%和33.3%。Add Zr to Al7Si0.3Mg alloy containing 0.3%Er,characterize the microstructure of the sample using Optical Microscopy(OM)and Scanning Electron Microscopy(SEM),analyze the phase composition using high-resolution X-Ray Diffraction(XRD),and test its mechanical properties.Study the effect of different contents of Zr on the microstructure morphology and mechanical properties of the alloy.The results showed that after adding Zr element,Zr and Er formed second phase particles Al 3Er and Al 3Zr,which played a dual nucleation and refinement role in the solidification process of aluminum liquid,significantly refiningα-Al.The branching of Al and eutectic Si improves the mechanical properties of the alloy.But if Zr is added too much,it will form too many intermetallic compounds with Er inside the alloy,weaken the modification effect,and cause a decrease in tensile strength and elongation.The best effect is achieved when the Zr content is 0.2%,with a tensile strength of 182 MPa and an elongation of 6.4%,which is 16.7%and 33.3%higher than the alloy without the addition of Zr element in terms of tensile strength and elongation,respectively.

关 键 词：变质 第二相 合金组织 晶粒细化 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]