摘要
以Mg-3Gd(质量分数,%)合金为研究对象,采用累积叠轧和退火工艺制备了由层厚不均匀的回复组织层和再结晶组织层交替组成的层状异构样品。拉伸实验结果表明,这种层状异构样品可以在同等拉伸塑性的条件下获得比均匀再结晶结构更高的强度,并表现出成形加工所需的连续流变行为。回复层和再结晶层之间的协调变形激发了锥面<c+a>滑移在界面附近的开动,增强了位错增殖和累积,提高了加工硬化率和塑性。
As the lightest structural metallic materials,Mg alloys have immense development potential in the automotive,aerospace,medical,and electronic industries.However,the low strength and the poor ductility of Mg alloys limit their engineering applications.Recent investigations have shown that heterostructured Mg alloys exhibit significantly improved strength and ductility.This work applies accumulative roll-bonding and subsequent annealing to a Mg-3Gd alloy to produce layered heterostructures composed of alternating recovered and recrystallized layers of varying thicknesses.These heterostructures exhibit higher strength than homogeneous grain structures at a similar tensile ductility.They also show a continuous flow behavior desired for metal forming.A high density of the<c+a>dislocations is activated at the interfaces between the layers to accommodate the deformation incompatibility,which contributes to dislocation multiplications and accumulations and enhances work hardening rate and ductility.
作者
罗旋
韩芳
黄天林
吴桂林
黄晓旭
LUO Xuan;HAN Fang;HUANG Tianlin;WU Guilin;HUANG Xiaoxu(International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing 400044,China;Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第11期1489-1496,共8页
Acta Metallurgica Sinica
基金
国家重点研发计划项目No.2021YFB3702101
国家自然科学基金项目No.52071038。
关键词
层状异构
力学行为
变形机制
镁合金
layered heterostructure
mechanical behavior
deformation mechanism
Mg alloy
