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Effect of long-period stacking ordered structure on very high cycle fatigue properties of Mg-Gd-Y-Zn-Zr alloys

Journal of Magnesium and Alloys 2023年第8期11卷 2811-2822页

作者： Xiangyu WANG Chao HE Xue Li Lang LI Yongjie LIU Qingyuan WANG Key Laboratory of Deep Earth Science and Engineering Ministry of EducationCollege of Architecture and EnvironmentSichuan UniversityChengdu 610065China Failure Mechanics&Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

Magnesium alloys with a long-period stacking ordered(LPSO)structure usually possess excellent static strength,but their fatigue behaviors are poorly *** work presents the effect of the LPSO structure on the crack behaviors of Mg alloys in a very high cycle fatigue(VHCF)*** LPSO lamellas lead to a facet-like cracking process along the basal planes at the crack initiation site and strongly prohibit the early crack propagation by deflecting the growth *** stress intensity factor at the periphery of the faceted area is much higher than the conventional LPSO-free Mg alloys,contributing higher fatigue crack propagation threshold of LPSO-containing Mg *** observation at the facets reveals a layer of ultrafine grains at the fracture surface due to the cyclic contact of the crack surface,which supports the numerous cyclic pressing model describing the VHCF crack initiation behavior.

关键词： Fatigue crack initiation long-period stacking ordered structure Mg alloys Ultrafine grains Very high cycle fatigue

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维普期刊数据库

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Guinier-Preston Zone,Quasicrystal and long-period stacking ordered structure in Mg-based Alloys,A Review

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Acta Metallurgica Sinica(English Letters) 2013年第3期26卷 217-231页

作者： Yongbo XU Daokui XU Xiaohong SHAO En-hou HAN State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang National Laboratory for Materials Science

Both the solid solution and precipitation are mainly strengthening mechanism for the magnesium-based alloys. A great number of alloying elements can be dissolved into the Mg matrix to form the solutes and ***, the type of precipitates varies with different alloying elements and heat treatments, which makes it quite difficult to understand the formation mechanism of the precipitates in Mg-based alloys in depth. Thus, it is very hard to give a systematical regularity in precipitation process for the Mg-based alloys. This review is mainly focused on the formation and microstructural evolution of the precipitates, as a hot topic for the past few years, including Guinier-Preston Zones, quasicrystals and long-period stacking ordered phases formed in a number of Mg-TM-RE alloy systems, where TM = Al, Zn, Zr and RE = Y,Gd, Hd, Ce and La.

关键词： Guinier-Preston zone Quasicrystal long-period stacking ordered structure Mg-based alloy

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维普期刊数据库

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Effect of long-period stacking ordered phase on microstructure,mechanical property and corrosion resistance of Mg alloys: A review

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Progress in Natural Science:Materials International 2016年第2期26卷 117-128页

作者： Daokui Xu En-hou Han Yongbo Xu Environmental Corrosion Center Institute of Metal Research Chinese Academy of Sciences Shenyang National Laboratory for Materials Science

Magnesium alloys containing long period stacking ordered(LPSO) phase have been received a great deal of attention in the last decade owing to their excellent comprehensive properties of mechanical strength and corrosion resistance. In this paper, some fundamental aspects of LPSO containing Mg alloys have been reviewed, including:(1) microstructural characterization, formation conditions and the associated phase transformation of LPSO phases in Mg alloys;(2) deformation mechanism of LPSO phases and their in fl uence on the deformation mechanism of the Mg matrix;(3) effect of LPSO structure on the mechanical performance such as tensile strength, creep resistance, fracture toughness and fatigue strength;(4) corrosion behavior of LPSO containing Mg alloys and their possible applications as the ***, some remaining unsolved issues of the LPSO containing Mg alloys and the future target about how to further improve their service properties have been also described.

关键词： Mg alloys long-period stacking ordered structure Microstructural characterization Mechanical properties Corrosion resistance

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The long-period stacking ordered structures in Mg-Zn-RE Alloys:A review

The long-period stacking ordered structures in Mg-Zn-RE Allo...

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2011中国材料研讨会

作者：马爱斌河海大学

The recent development of high-strength Mg alloys has focused on the role of the strengthening phase with a novel long-period stacking ordered （LPSO） *** review details the factors influencing the types of stacking sequences such as RE additions,preparation methods and heat treatment *** formation behavior,strengthening and toughening mechanisms of the LPSO phase are *** the end,the development trends and current problems are also put forward.

关键词： long-period stacking ordered structure stacking sequence formation strengthening mechanism

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