通过调整双峰晶粒结构实现低合金镁-锂-铒挤压合金的高强度-延展性协同效应

Materials Pub Date : 2024-07-15 DOI:10.3390/ma17143506
Ruyue Tang, Jing Zhang, Zhenwei Gong, Bingcheng Li, Quan Dong
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摘要

本研究开发了低合金镁-锂-铒合金,并通过改变痕量铒的含量和挤压温度获得了双峰晶粒结构。合金显示出良好的强度-电导率协同作用,即拉伸屈服强度(TYS)为 270 兆帕,伸长率(EL)为 19.1%。微结构表征显示,大量亚微米级 Mg24Er5 颗粒的形成有利于在变形晶粒内部形成高密度的低角度晶界 (LAGB),并抑制了动态再结晶 (DRX)。由此产生的具有较强基底纹理和大量 LAGB 的粗大未 DRX 化晶粒与细小 DRX 化晶粒共同促成了高强度-电导率协同作用。
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Achieving High Strength–Ductility Synergy in Low-Alloyed Mg–Li–Er Extrusion Alloys via Tailoring Bimodal-Grained Structure
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.
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