Effects of titanium addition on structural, mechanical, tribological, and corrosion properties of Al-25Zn-3Cu and Al-25Zn-3Cu-3Si alloys  

添加钛对Al-25Zn-3Cu和Al-25Zn-3Cu-3Si合金的结构、力学、摩擦学和腐蚀性能的影响（英文）

作　　者：Ali Pa?a HEK?MO?LU Merve ?ALI? 

机构地区：[1]Mechanical Engineering Department, Engineering Faculty, Recep Tayyip Erdo?an University

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第2期303-317,共15页中国有色金属学报（英文版）

摘　　要：To investigate the effect of grain refinement on the material properties of recently developed Al-25 Zn-3 Cu based alloys,Al-25 Zn-3 Cu,Al-25 Zn-3 Cu-0.01 Ti,Al-25 Zn-3 Cu-3 Si and Al-25 Zn-3 Cu-3 Si-0.01 Ti alloys were produced by permanent mold casting method.Microstructures of the alloys were examined by SEM.Hardness and mechanical properties of the alloys were determined by Brinell method and tensile tests,respectively.Tribological characteristics of the alloys were investigated by a ball-on-disc type test machine.Corrosion properties of the alloys were examined by an electrochemical corrosion experimental setup.It was observed that microstructure of the ternary A1-25 Zn-3 Cu alloy consisted ofα,α+ηandθ(Al2Cu)phases.It was also observed that the addition of 3 wt.%Si to A1-25Zn-3Cu alloy resulted in the formation of silicon particles in its microstructure.The addition of 0.01 wt.%Ti to the Al-25Zn-3Cu and Al-25 Zn-3 Cu-3 Si alloys caused a decrement in grain size by approximately 20%and 39%and an increment in hardness from HRB 130 to 137 and from HRB 141 to 156,respectively.Yield strengths of these alloys increased from 278 to 297 MPa and from 320 to 336 MPa while their tensile strengths increased from 317 to 340 MPa and from 334 to 352 MPa.Wear resistance of the alloys increased,but corrosion resistance decreased with titanium addition.为了研究晶粒细化对新开发的Al-25Zn-3Cu基合金性能的影响,采用金属型铸造法制备Al-25Zn-3Cu、Al-25Zn-3Cu-0.01Ti、Al-25Zn-3Cu-3Si和Al-25Zn-3Cu-3Si-0.01Ti合金。用扫描电镜(SEM)观察合金的显微组织,分别用布氏硬度法和拉伸试验测定合金的硬度和力学性能,用球盘式摩擦试验机研究合金的摩擦学特性,用电化学腐蚀实验装置研究合金的腐蚀性能。结果显示,A1-25Zn-3Cu三元合金的显微组织含有α、α+η和θ(Al2Cu)相。添加3%Si(质量分数)的A1-25Zn-3Cu合金显微组织中形成硅颗粒。添加0.01%Ti(质量分数)的Al-25Zn-3Cu和Al-25Zn-3Cu-3Si合金的晶粒尺寸分别减小约20%和39%,硬度分别从HRB130和HRB141增加到HRB 137和HRB 156,合金的屈服强度分别从278 MPa和320 MPa增加到297 MPa和336 MPa,抗拉强度分别从317 MPa和334 MPa增加到340 MPa和352 MPa。随着钛含量的增加,合金的磨性提高,但耐腐蚀性降低。

关 键 词：Al-Zn-Cu alloy as-cast microstructure characterization CORROSION fracture friction and wear characteristics mechanical properties 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]