Microstructures and Mechanical Properties of Mg-13Gd-1Zn Alloy

doi:10.11901/1005.3093.2019.364

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 225-230 DOI: 10.11901/1005.3093.2019.364

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Microstructures and Mechanical Properties of Mg-13Gd-1Zn Alloy

ZHEN Rui^1,²(

),WU Zhen¹,XU Hengyuan¹,TAN Shuyong^1,²

1. School of Material Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China

Cite this article:

ZHEN Rui,WU Zhen,XU Hengyuan,TAN Shuyong. Microstructures and Mechanical Properties of Mg-13Gd-1Zn Alloy. Chinese Journal of Materials Research, 2020, 34(3): 225-230.

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Abstract

A ternary alloy with composition of Mg-13Gd-1Zn (%, mass fraction) was prepared by conventional smelting and casting technique. The microstructure and mechanical properties of the as-cast, as-annealed, as-extruded and as-aged (T5) alloy were investigated. The results show that the microstructure of the as-cast alloy consists of α-Mg matrix, (Mg, Zn)₃Gd eutectic and a 14H long period staking ordered (14H-LPSO) phase. The significant increase of 14H-LPSO phase after annealing and ageing (T5) treatment in the alloy microstructure indicates that the precipitation of the 14H-LPSO phase occurs in a wide temperature range (200~510^oC). The β' and β₁precipitates have also been observed in the alloy after ageing (T5) treatment. Under the combined action of precipitation strengthening and LPSO strengthening, the tensile strength, yield strength and elongation of the alloy are 397 MPa, 197 MPa and 2.56%, respectively. The creep properties of the Mg-13Gd-1Zn alloy are higher than those of the WE54 alloy in the two experimental conditions of 200^oC/80 MPa and 200^oC/120 MPa.

Key words: metallic materials magnesium alloy hot extrusion ageing treatment long period stacking ordered structures (LPSO) creep

Received: 22 July 2019

ZTFLH:

TG146.22

Fund: Innovation and Entrepreneurship Training Program for College Students in Jiangsu Province(201911276034Y);the Research Foundation of Nanjing Institute of Technology(ZKJ201604);Outstanding Scientific and Technological Innovation Team in Colleges and Universities of Jiangsu Province

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	Rui ZHEN
	Zhen WU
	Hengyuan XU
	Shuyong TAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.364 OR https://www.cjmr.org/EN/Y2020/V34/I3/225

Fig.1 X-ray diffraction patterns of the as-cast (a) and as-annealed (b) alloy

Fig.2 OM images of the alloy and corresponding SAED(EB//[11

2 ?

0]_α) pattern of the lamella phase in the alloy (a) as-cast, (b) as-annealed

Fig.3 OM (a) and SEM (b) images of the as-extruded alloy

Fig.4 SEM (a) and TEM (b) images of the alloy after T5 treatment

Table 1 Tensile properties of the Mg-13Gd-1Zn alloy at room temperature

Fig.5 TEM image and corresponding SAED(EB//[11

2 ?

0]_α) pattern of 14H-LPSO structure in ageing (T5) alloy after tensile test

Fig.6 Creep curves of the alloys at 200℃/80 MPa (a) and 200℃/120 MPa (b) for 100 h

Table 2 Creep properties of alloys studied at 200℃/80 MPa and 200℃/120 MPa

Fig.7 SEM micrograph of Mg-13Gd-1Zn alloy after creep at 200℃/80 MPa for 100 h

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