稀土元素La对Al-0.5Mg-0.24Si合金组织和性能的影响  

Effects of Rare Earth Element La on the Microstructure and Properties of Al-Mg-Si Alloy

作　　者：赵燕 张宇博[1,2] 李廷举 王玮[1] 李绍威 许晨玲 Zhao Yan;Zhang Yubo;Li Tingju;Wang Wei;Li Shaowei;Xu Chenling(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology;Ningbo Institute of Dalian University of Technology;Dalian Huicheng Aluminum Co..Ltd.)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁省凝固控制与数字化制备技术重点实验室 [2]大连理工大学宁波研究院 [3]大连汇程铝业有限公司

出　　处：《特种铸造及有色合金》2021年第10期1219-1223,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51971048);大连理工大学重点实验室科研专题资助项目(DUT20LAB141);兴辽英才计划团队资助项目(XLYC1808005)。

摘　　要：以Al-0.5Mg-0.24Si合金为研究对象,探讨了稀土元素La对合金微观组织、导电性能、力学性能及耐腐蚀性的影响。结果表明,La能与Si形成LaSi2稀土相,并且促进富Fe相从β-Al5FeSi向α-Al8Fe2Si转变。经过热轧和热处理后,适量La的加入可提高Al-0.5Mg-0.24Si合金的电导率和力学性能。当La的加入量为0.1%时,合金电导率最高,为31.80 MS/m;当La的加入量为0.3%,合金抗拉强度为175 MPa,伸长率为22%。但La的加入会降低铝合金的耐腐蚀性能。Taking Al-0.5 Mg-0.24 Si alloy as object, the effects of rare earth element La on the microstructure, electrical conductivity, mechanical properties and corrosion resistance of Al-0.5 Mg-0.24 Si alloy were investigated. The results indicate that the combination of La with Si can generate rare earth phase LaSi_(2), which promotes the transformation from the β-Al_(5)FeSi phase to α-Al_(8)Fe_(2)Si phase. After hot rolling and heat treatment, the appropriate addition of La can enhance the electrical conductivity and tensile properties of Al-0.5 Mg-0.24 Si alloy. With the addition of 0.1% La, the electrical conductivity reaches the maximum value of 31.80 MS/m. With the addition of 0.3% La, the tensile strength and the elongation reach 175 MPa and 22%, respectively, whereas the addition of La can reduce the corrosion resistance of Al alloy.

关 键 词：稀土元素LA AL-MG-SI合金 电导率 力学性能 耐腐蚀性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.45[金属学及工艺—金属材料]