LPSO相增强镁稀土合金耐热性能研究进展

doi:10.11896/cldb.18090201

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Abstract As the lightest structural metallic materials, magnesium alloys have exhibited great application potential and bright development prospect in aerospace, military, and new energy automobile industries due to the low density, rich resources, high specific strength and stiffness, high damping capacity, good thermal conductivity and electrical conductivity, easy recovery, and so on. However, the low absolute strength of magnesium alloys, especially low strength at high temperatures and poor heat resistance, greatly restrict their further applications as some key components. Therefore, the development of novel high-strength, high-toughness, and heat-resistant magnesium alloys has become one of the serious issues at present.
When Gd or Y rare earth elements and Zn element are simultaneously added into magnesium alloys, a novel long period stacking ordered (LPSO) phase could be formed. Owing to the existence of LPSO phase, the mechanical properties of magnesium alloys are remarkably promoted with ultimate tensile strength exceeding 500 MPa, and the heat resistances are also improved, with higher tensile strength at elevated temperatures and better creep resistance than conventional WE54 commercial magnesium alloys. Recently, researchers have conducted extensive researches on the heat resistance of LPSO strengthened Mg-RE alloys, and have gained some important results. These researches mainly focus on two aspects. One is to study the thermostability of LPSO structures, i.e. the transformation and evolution mechanisms of various LPSO structures at high temperatures. The other one is to investigate the high temperature mechanical properties (tensile, compression and creep resistance) of Mg-RE-Zn alloys and develop the new generation high strength and heat-resistant magnesium alloys.
With the aid of advanced high-resolution electron microscopes, the atomic structures and formation mechanism of 18R and 14H LPSO phases have been systematically investigated. According to the alloy compositions and processed states, 14H LPSO phase could be formed at high temperatures in two ways, precipitated from α-Mg matrix directly or transformed from 18R phase. By high-temperature tensile/compression tests and microstructure characterizations, the interactions between LPSO phases, dislocations, twins and grain boundaries are expounded, as well as the strengthening mechanism of LPSO phase. The creep researches in recent years further confirm the great potential of LPSO phases on enhancing the creep resistance of Mg-RE-Zn alloys. The morphologies and strengthening effects of various LPSO phases, and their interactions with variety of precipitates, impact the creep resistance of magnesium alloys significantly. Nevertheless, the creep controlling mechanisms of these alloys and the role of LPSO phase during creep remain unclear by now.
In this article, the transformation mechanism of LPSO phase and microstructure evolutions of magnesium alloys at high temperature are reviewed. The influence of structure, morphology and distribution of LPSO phases on high temperature mechanical properties of magnesium alloys is discussed. Finally, the problems and development prospects of LPSO-strengthening heat resistant magnesium alloys are prospected.

Key words： long period stacking ordered structure thermal stability high temperature strength creep resistance

Published: 15 August 2019

CLC number:

TG146.2+2

About author:: Ce Wang received his bachelor’s degree in engineering from Hohai University in 2017. Aibin Ma, professor, College of Mechanics and Mate-rials, Hohai University. He earned his doctor’s degree of engineering from Japan Aichi Institute of Technology in 1997.

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	WANG Ce
	MA Aibin
	LIU Huan
	HUANG He
	SUN Jiapeng
	YANG Zhenquan
	JIANG Jinghua

Cite this article:

WANG Ce,MA Aibin,LIU Huan, et al. Research Progress on Heat Resistance of Magnesium-Rare Earth Alloys Reinforcedby Long Period Stacking Ordered Phase[J]. Materials Reports, 2019, 33(19): 3298-3305.

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http://www.mater-rep.com/EN/10.11896/cldb.18090201 OR http://www.mater-rep.com/EN/Y2019/V33/I19/3298

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