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
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（35）
• 页码范围: 22-31
• 页数: 10页
• 语种: 英文

摘要

Specially designed Mg-Cu-Al alloys were prepared for the application in fracturing balls.In comparison to Mg-2.5Cu alloy,Mg-2.5Cu-6.0Al alloy exhibits an improved compressive strength of 378 MPa and com-pressive strain of 27g,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-Mg17Al12+Al2Cu phases.They form a discontinuous net-work 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 enhance-ment 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 defor-mation.This accounts for the good ductility in Mg-Cu-Al alloys.