Strength-ductility synergy in Mg-Gd-Y-Zr alloys via texture engineering in bi-directional forging  

作　　者：Jingli Li Quanfeng Han Xiuzhu Han Xin Yi 

机构地区：[1]Institute for Advanced Materials,North China Electric Power University,Beijing 102206,China [2]Department of Mechanics and Engineering Science,College of Engineering,Peking University,Beijing 100871,China [3]Beijing Institute of Spacecraft System Engineering,Beijing 100094,China

出　　处：《Journal of Magnesium and Alloys》2024年第11期4709-4721,共13页镁合金学报(英文)

基　　金：National Natural Science Foundation of China (11988102 and 52301146);Chinese Postdoctoral Science Foundation (8206300226);National Science and Technology Infrastructure Platform Development Plan-Young Backbone Talents Training Project (52001325);Fundamental Research Funds for the Central Universities (JB2023118)。

摘　　要：In this work,we successfully fabricate an ultra-high strength Mg-11Gd-3Y-0.5Zr alloy with ultimate tensile strength of 523 MPa and enhanced ductility via cost-effective bi-directional forging (BDF) and subsequent annealing heat treatments.To elucidate the role of BDF and gain a fundamental understanding of the remarkable simultaneous increase of strength and ductility,systematic microstructure characterization and analysis are performed.It is revealed that the double-peak basal texture,with basal poles located at the center of two mutually perpendicular forging directions,serves as an essential factor for the strength-ductility synergy of the Mg-11Gd-3Y-0.5Zr alloy processed with BDF.Roles of the double-peak basal texture in overcoming the strength-ductility trade-off include promoting non-basal slip,increasing ductility,and enlarging the Hall-Petch effect along the sample elongation direction while reducing the extent of anisotropy in critical resolved shear stresses of different slip systems.This study demonstrates that texture engineering is a powerful strategy to control magnesium alloy performance and BDF is a promising processing technique for enhancing mechanical properties of magnesium alloys.

关 键 词：Bi-directional forging(BDF) Magnesium alloys High strength TEXTURE Anisotropy 

分 类 号：TG319[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]