文献类型：期刊文献

英文题名：Effect of Aging Treatments on the Nanoprecipitation Mechanism and Dynamic Impact Behavior of Mg-7.5Gd-3Y-0.5Zr Alloy

作者：Wang, Xuezhao[1]; Zhang, Ping[1]; Jiang, Xiaomin[1]; Wang, Youqiang[2]

机构：[1] School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang, 524088, China; [2] School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao, 266520, China

年份：2026

卷号：21

期号：2

外文期刊名：Nano

收录：EI(收录号：20251118044904)

语种：英文

外文关键词：Brinell Hardness - Brittle fracture - Ductile fracture - Fracture mechanics - Gadolinium alloys - High resolution transmission electron microscopy - Impact strength - Magnesium alloys - Microhardness - Tensile strength - Tensile testing - Zinc alloys

外文摘要：This study aims to enhance the dynamic impact mechanical properties of Mg-7.5Gd-3Y-0.5Zr alloy by investigating the effects of aging treatments on its microstructure and dynamic impact behavior. Using various techniques, including metallographic observation, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), microhardness testing and split-Hopkinson pressure bar tests, the microstructural and macroscopic static-dynamic properties of the alloy under different aging conditions were thoroughly examined. The findings indicate the following: The aging treatments identified based on hardness curves and TEM analysis include under-aging (β′′), peak-aging (β′) and over-aging (β), with specific conditions of 225°C for 3h, 225°C for 12h and 350°C for 12h, respectively. The alloy exhibits a maximum impact strength of 560 MPa～under under-aging conditions. Under peak aging, the maximum impact strength increases to 596 MPa. The optimal impact strength under over-aging conditions is 558 MPa～. The deformation mechanisms of the alloy under under-aging conditions are characterized by a combination of tensile and compressive twinning. In contrast, peak-aging and over-aging conditions primarily involve tensile twinning, with compressive twinning playing a secondary role. The fracture mechanisms of the alloy under various aging states are mainly a mix of ductile and brittle fractures. However, in the under-aged sample, the volume fraction of the dimples is significantly more than that of cleavage planes, which ductile-brittle mixed fracture dominated by ductile fracture; for the peak-aging alloy, the number of cleavage planes increases, showing ductile-brittle mixed fracture dominated by brittle fracture. ? 2026 World Scientific Publishing Company.