Dual-phase synergistically enhancing mechanical properties and thermal conductivity of hot-extruded Mg-8Gd-1Er-8Zn-1Mn alloy  

作　　者：Xudong Li Wenbo Du Feng Lou Ning Ding Xian Du Shubo Li 

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Magnesium and Alloys》2025年第3期1176-1186,共11页镁合金学报(英文)

基　　金：supported by the Nation Key Research and Development Program of China(No.2021YFB3701100).

摘　　要：The contradiction between mechanical properties and thermal conductivity of magnesium alloys is a roadblock for their widespread applications.In this study,we developed a hot-extruded Mg-8Gd-1Er-8Zn-1Mn alloy with high-strength and high-thermal-conductivity via dual-phase,W-phase andα-Mn,synergistically strengthening.The alloy extruded at 300°C exhibited the yield strength and elongation of 372 MPa and 12%,respectively,it simultaneously demonstrated a high thermal conductivity of 134.3W/(m·K).After extrusion,the original coarse W-phase in the alloy was broken into near-spheroidal particles,which reduced the probability of electron scattering.In addition,a large number of solute atoms dynamically precipitated in the form of nanoscale rod-like W-phase andα-Mn,makingα-Mg matrix revert to a nearly periodic arrangement state.The high yield strength of the alloy is predominantly determined by grain boundary strengthening as well as W-phase andα-Mn dual-phase strengthening.Notably,the strategy of dual-phase strengthening provides a valuable approach for developing structure-function integrated Mg alloys.

关 键 词：Mg-RE-Zn alloy W-phase α-Mn Thermal conductivity Strength 

分 类 号：TG146.22[一般工业技术—材料科学与工程]