Microstructure and Mechanical Properties of Layered Heterostructured Mg-3Gd Alloy
Received date: 2022-07-18
Revised date: 2022-08-19
Online published: 2022-08-31
Supported by
National Key Research and Development Program of China(2021YFB3702101);National Na-tural Science Foundation of China(52071038)
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.
Xuan LUO , Fang HAN , Tianlin HUANG , Guilin WU , Xiaoxu HUANG . Microstructure and Mechanical Properties of Layered Heterostructured Mg-3Gd Alloy[J]. Acta Metall Sin, 2022 , 58(11) : 1489 -1496 . DOI: 10.11900/0412.1961.2022.00343
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