Microstructure and Mechanical Properties of Layered Heterostructured Mg-3Gd Alloy

doi:10.11900/0412.1961.2022.00343

Acta Metall Sin

2022, Vol. 58

Issue (11): 1489-1496 DOI: 10.11900/0412.1961.2022.00343

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Microstructure and Mechanical Properties of Layered Heterostructured Mg-3Gd Alloy

LUO Xuan¹^,², HAN Fang¹^,², HUANG Tianlin¹^,², WU Guilin³, HUANG Xiaoxu¹^,²(

)

^1.International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
^2.Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, China
^3.Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

LUO Xuan, HAN Fang, HUANG Tianlin, WU Guilin, HUANG Xiaoxu. Microstructure and Mechanical Properties of Layered Heterostructured Mg-3Gd Alloy. Acta Metall Sin, 2022, 58(11): 1489-1496.

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Abstract

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.

Key words: layered heterostructure mechanical behavior deformation mechanism Mg alloy

Received: 18 July 2022

ZTFLH:

TB31

Fund: National Key Research and Development Program of China(2021YFB3702101);National Na-tural Science Foundation of China(52071038)

About author: HUANG Xiaoxu, professor, Tel: (023)65127230, E-mail: xiaoxuhuang@cqu.edu.cn

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	Xuan LUO
	Fang HAN
	Tianlin HUANG
	Guilin WU
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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00343 OR https://www.ams.org.cn/EN/Y2022/V58/I11/1489

Fig.1 TEM images (a, c) and sketches (b, d) showing a lamellar structure (a, b) and a twin block structure based on the experimental data reported in Ref.[27] (c, d) of the ARB-deformed Mg-3Gd alloy (RD—rolling direction, ND—normal direction, ARB—accumulative roll-bonding, LBs—lamellar boundaries, LAB—low-angle boundary, TB—twin boundary, SF—stacking fault. Inset in Fig.1d shows the corresponding electron diffraction pattern of a deformation twin (T1) and matrix)

Fig.2 SEM image (a), EBSD image (b), and TEM images (c, d) taken from the Mg-3Gd sample partially recrystallized at 290^oC showing a layered heterostructure composed of alternating recovered and recrystallized layers of varying thicknesses

Fig.3 Tensile engineering stress-strain curves (a), tensile true stress-strain curves (b), work hardening rate-true strain curves (c), and work hardening rate-true stress curves (d) of the Mg-3Gd alloy with ARB-deformed structure, layered heterostructures (indicated by Hetero), and homogeneous recrystallized grain structures (indicated by Homo) (d—average grain size)

Fig.4 Uniform elongation versus yield strength of Mg-3Gd alloy with different microstructures and average grain sizes

Fig.5 Uniform elongation versus yield strength of AZ31 alloy plotted based on the experimental data reported in Ref.[24]

Fig.6 Dislocation structure analyses of the layered heterostructured Mg-3Gd sample after tensile deformation
(a) bright field TEM image (Red line in Fig.6a shows the interface of recovered area and recrystallized area)
(b) two-beam dark field TEM image with g = [0002] near the [

01 1 ¯ 0

] zone axis

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