Achieving High Strength–Ductility Synergy in Low-Alloyed Mg–Li–Er Extrusion Alloys via Tailoring Bimodal-Grained Structure

Author:

Tang Ruyue1,Zhang Jing12,Gong Zhenwei1,Li Bingcheng1,Dong Quan1

Affiliation:

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China

Abstract

Low-alloyed Mg–Li–Er alloys were developed in this study and a bimodal-grained structure was obtained by varying the trace Er content and extrusion temperature. The alloys displayed a good strength–ductility synergy, i.e., a tensile yield strength (TYS) of 270 MPa and an elongation (EL) of 19.1%. Microstructural characterization revealed that the formation of numerous submicron Mg24Er5 particles favored a high density of low-angle grain boundaries (LAGBs) inside the deformed grains and inhibited dynamic recrystallization (DRX). The resultant coarse unDRXed grains with a strong basal texture and considerable LAGBs, together with the fine DRXed grains, contributed to the high strength–ductility synergy.

Funder

Chongqing Talents

Publisher

MDPI AG

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