稀土复合微合金化对A356.2铝合金组织与性能的影响  

Effect of Rare Earth Compound Microalloying on Microstructure and Mechanical Properties of A356.2 Aluminum Alloy

作　　者：叶珍 苗赛男 郑长清 朱大智 YE Zhen;MIAO Sai-nan;ZHENG Chang-qing;ZHU Da-zhi(Baoding Lizhong Wheel Mantufacturing Co.,Ltd.,Hebei High Strength and Toughness Lightweight Wheel Technology Innovation Center,Baoding 071000,Hebei,China)

机构地区：[1]保定市立中车轮制造有限公司河北省高强韧轻量化车轮技术创新中心,河北保定071000

出　　处：《铸造》2021年第3期356-360,共5页Foundry

摘　　要：通过光学显微镜、扫描电镜和拉伸试验机等分析手段研究了多元稀土元素复合添加对A356.2铝合金微观组织及力学性能的影响,并与添加Al-Ti-B和Al-Sr的A356.2微观组织及力学性能进行了对比。结果表明,在多种元素复合添加后,A356.2铝合金的细化和变质效果均较添加Al-Sr、Al-Ti-B时要好,含Fe相也从针状转变成细小的颗粒状。且多元稀土元素复合添加后,合金的伸长率为6.26%,较添加前的4.40%提升了42.38%。The microstructure and mechanical properties of A356.2 aluminum alloy treated by multiple rare earth compound were studied by means of optical microscope,scanning electron microscope and tensile testing machine,and compared with those of A356.2 aluminum alloy treated by Al-Ti-B and Al-Sr master alloys.The results show that after the addition of multiple rare earth compound,the refinement and modification effects of A356.2 aluminum alloy were better than those with treated by Al-Ti-B and Al-Sr master alloys,and the morphology of the Fe-containing phase also changed from needle-like to fine particles.In addition,the elongation of the alloy treated with multiple rare earth compound is 6.26%,with 42.38%higher than 4.40%obtained by the conventional alloy refined and modified by Al-Ti-B and Al-Sr.

关 键 词：A356.2铝合金 稀土元素 微观组织 伸长率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]