Improved mechanical properties of highly alloyed Mg-10Gd-5Y-5Er-<i>x</i>Zn alloys via tailoring LPSO phase structure

Improved mechanical properties of highly alloyed Mg-10Gd-5Y-5Er-xZn alloys via tailoring LPSO phase structure

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Zhiying Zheng^a^,^b, Zhihua Dong^a^,^b^,^*, Cuihong Wang^a^,^b, Yulun Luo^a^,^b, Shengwen Bai^a^,^b, Ang Zhang^a^,^b, Jiangfeng Song^a^,^b, Bin Jiang^a^,^b

Transactions of Materials Research | 2025, 1(1) : 100007

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Transactions of Materials Research | 2025, 1(1): 100007

• METALLIC MATERIALS •

Improved mechanical properties of highly alloyed Mg-10Gd-5Y-5Er-xZn alloys via tailoring LPSO phase structure

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Zhiying Zheng^a^,^b, Zhihua Dong^a^,^b^,^*, Cuihong Wang^a^,^b, Yulun Luo^a^,^b, Shengwen Bai^a^,^b, Ang Zhang^a^,^b, Jiangfeng Song^a^,^b, Bin Jiang^a^,^b

Affiliations

^aNational Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

^bNational Key Laboratory of Advanced Casting Technologies, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Published: 2025-04-03 doi: 10.1016/j.tramat.2025.100007

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Abstract

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The highly alloyed Mg-10Gd-5Y-5Er alloy exhibits high strength, however, the brittle Mg₂₄RE₅ phase accelerates the initiation and development of micro-cracks and significantly deteriorate the plastic deformation ability. Therefore, it is necessary to regulate the type of precipitates to improve the comprehensive mechanical properties of the alloy. In this work, the influence of Zn content on mechanical properties and microstructure evolution of highly alloyed Mg-10Gd-5Y-5Er-xZn alloys (x = 0, 1, 2, 3, and 5 wt%) was investigated. It was found that the tensile strength increases with increasing Zn content, without deterioration of elongation. The maximum tensile yield strength and ultimate tensile strength are achieved to be 298 MPa and 406 MPa, respectively, within the studied concentration range. Thermodynamic calculations and microstructural characterization results indicate that with the increase of Zn content the precipitate transform from Mg₂₄RE₅ phase to long-period-stacking-ordered (LPSO) phase and lamellar structure. This transition will change the solute atom concentration in the matrix and affect the dynamic recrystallization behavior, thereby changing the contributions of solid solution strengthening and grain refinement strengthening to the yield strength of alloy. In particular, the blocky LPSO phase can significantly contribute to the increased strength at relatively high Zn contents (x > 2 wt%) by a mechanism similar to short-fiber strengthening. Moreover, the strategy of improving the mechanical properties by increasing the volume fraction of blocky LPSO phase can be applied to many Mg alloy systems containing LPSO phase.

Key words

Magnesium alloys / Highly alloyed Mg-RE-Zn alloy / Mechanical properties / LPSO phase / Microstructure evolution

Cite this Article

Zhiying Zheng, Zhihua Dong, Cuihong Wang, Yulun Luo, Shengwen Bai, Ang Zhang, Jiangfeng Song, Bin Jiang. Improved mechanical properties of highly alloyed Mg-10Gd-5Y-5Er-xZn alloys via tailoring LPSO phase structure[J]. Transactions of Materials Research, 2025 , 1 (1) : 100007 - . DOI: 10.1016/j.tramat.2025.100007

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Funding

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National Natural Science Foundation of China(52371094; 52101126)
National Key Research and Development Program of China(2022YFB3709300)
Fundamental Research Funds for the Central Universities(2024CDJYXTD-002)

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Year 2025 volume 1 Issue 1

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Article Info

doi: 10.1016/j.tramat.2025.100007

Receive Date：2025-03-21
Online Date：2026-06-10
Published：2025-04-03

Article Data

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History

Received：2025-03-21
Revised：2025-04-02
Accepted：2025-04-02

Funding

National Natural Science Foundation of China(52371094; 52101126)

National Key Research and Development Program of China(2022YFB3709300)

Fundamental Research Funds for the Central Universities(2024CDJYXTD-002)

Affiliations

^aNational Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

^bNational Key Laboratory of Advanced Casting Technologies, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Corresponding:

^* National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China. E-mail address: dzhihua@cqu.edu.cn (Z. Dong).

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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