High strength-ductility and rapid degradation rate of as-cast Mg-Cu-Al alloys for application in fracturing balls  

作　　者：Wei Tan Tianshu Li Suzhi Li Daqing Fang Xiangdong Ding Jun Sun 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China [2]Fontana Corrosion Center,The Ohio State University,Columbus,OH,43210,USA

出　　处：《Journal of Materials Science & Technology》2021年第35期22-31,共10页材料科学技术（英文版）

基　　金：NSFC(51320105014,51621063);the 111 project(BP 2018008)for financial support。

摘　　要：Specially designed Mg-Cu-Al alloys were prepared for the application in fracturing balls.In comparison to Mg-2.5 Cu alloy,Mg-2.5 Cu-6.0 Al alloy exhibits an improved compressive strength of 378 MPa and compressive strain of 27%,combined with a high degradation rate of 383 mm/y.Two kinds of second-phases are found in Mg-Cu-Al alloys,i.e.MgAlCu andβ-Mg_(17)Al_(12)+Al_(2)Cu phases.They form a discontinuous network and act as cathodes for micro-galvanic corrosion,leading to a high degradation rate.Moreover,the addition of Al could improve the strength and ductility simultaneously in Mg-Cu alloys.The enhancement of strength primarily arises from the solid-solution strengthening and second-phase hardening.A high density of basal,non-basal dislocations and stacking faults were activated upon mechanical deformation.This accounts for the good ductility in Mg-Cu-Al alloys.

关 键 词：Mg-Cu-Al alloy Microstructure Micro-galvanic corrosion Mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TE934.2[金属学及工艺—金属材料]