Zn、RE对AlMgSiCu合金组织及其性能的影响  

Effects of Zn and RE on Microstructure and Properties of AlMgSiCu Alloy

作　　者：王静鸽[1] 王智民[1] 鲁进波 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710000

出　　处：《热加工工艺》2015年第12期104-107,共4页Hot Working Technology

摘　　要：通过研究Zn和RE在AlMgSiCu合金中所起的作用,发现Zn含量增加会减少合金中的Al含量以及Al-Cu化合物的形成趋势,增加合金中的Cu Zn2富铜相,可使得合金的抗拉强度和硬度增加;对RE的研究证实了RE对高锌铝合金的细化作用,但是过量的RE在高锌铝合金中会形成针状RE化合物,这对合金的力学性能产生副作用。试验中当Zn和RE含量分别为7.5%、0.2%时,组织中没有出现明显的针状RE相,合金综合性能最好,抗拉强度343.14MPa、硬度112.3 HB,对于1#合金分别提高了10.2%、2.7%,只是伸长率下降了17.5%。By analyzing the action of rare earth and zinc in A1MgSiCu alloy, it is found that the increasing of zinc can lead the content of A1 in the alloy to decrease, to reduce the tendency to form A1-Cu compound, and increase the copper-rich phase of CuZn2, so that the tensile strength and hardness of the alloy improve. It is confirmed that the refinement of RE in high zinc aluminum alloy exist, but the acicular RE compounds appear in the alloy if adding excessive RE in high zinc aluminum alloy, it is bad for the alloy. When adding 0.2% Re and 7.5% Zn to the alloy, there are no obvious needle RE phase in the alloy, which is best for the comprehensive performance of alloy, the tensile strength of 343.14 MPa and hardness of 112.3 HB, the first alloy increased by 10.2% and 2.7% compared with 1# alloy, only the elongation decreases by 17.5%.

关 键 词：ZN RE 高锌铝合金 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]