Y元素对汽车发动机用高强铝合金组织与性能的影响  

Effects of Y Element on Microstructure and Properties of High-strength Al Alloy for Engine

作　　者：彭二宝[1,2] 陈昌铎[2] PENG Erbao;CHEN Changduo(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430000,China;School of Mechanical Engineering,Henan Polytechnic Institute,Nanyang 473000,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430000 [2]河南工业职业技术学院机械工程学院,河南南阳473000

出　　处：《热加工工艺》2021年第20期65-67,共3页Hot Working Technology

基　　金：河南省科技厅科技攻关项目(142102310526);河南省科技厅科技攻关项目(142102310226)。

摘　　要：制备了不同Y含量的AlSi_(6)Cu_(3)Mg合金。通过显微组织观察、拉伸性能测试等方法,研究了Y含量对Al Si_(6)Cu_(3)Mg合金组织与力学性能的影响。研究表明:在室温条件下,未添加Y的铸态Al Si_(6)Cu_(3)Mg合金抗拉强度略高于添加Y元素的。适量添加Y可使AlSi_(6)Cu_(3)Mg合金组织得到细化,Y含量为0.2wt%时,细化效果最好,此时铸态AlSi_(6)Cu_(3)Mg合金的强度达到最大值。在250℃下,添加Y的AlSi_(6)Cu_(3)Mg合金抗拉强度均高于未添加Y元素的。随着Y含量的增加,AlSi_(6)Cu_(3)Mg合金的抗拉强度先增加后降低,Y含量0.2wt%时合金的抗拉强度达到最大值277 MPa,比未添加Y元素的合金提高了近10%,此时伸长率达6.8%。AlSi_(6)Cu_(3)Mg alloy with different Y content were prepared.The effects of Y content on the microstructure and mechanical properties of AlSi_(6)Cu_(3)Mg alloy were studied by OM and tensile testing.The results show that the tensile strength of as-cast AlSi_(6)Cu_(3)Mg alloy without Y element is slightly higher than that of the alloy with Y element at room temperature.The microstructure of AlSi_(6)Cu_(3)Mg alloy can be refined by adding a certain amount of Y.When the content of rare earth Y reaches 0.2 wt%,the refinement effect is best.At this time,the tensile strength of as-cast AlSi_(6)Cu_(3)Mg alloy reaches the maximum.The tensile strength of AlSi_(6)Cu_(3)Mg alloy with Y is higher than that without Y element at 250℃.With the increase of Y content,the tensile strength of AlSi_(6)Cu_(3)Mg alloy first increases and then decrease.When the content of Y is0.2 wt%,the tensile strength of the alloy reaches the maximum value of 277 MPa,which is nearly 10%higher than that of the alloy without Y element,and the elongation rate reaches 6.8%.

关 键 词：Y元素 AlSi_(6)Cu_(3)Mg合金 力学性能 抗拉强度 

分 类 号：TG146.21[一般工业技术—材料科学与工程]