Transactions of Materials and Heat Treatment

Title：Microstructure evolution and mechanical properties on Mg-Li alloy in multiaxial compression

Authors： Zhu Songqi1 2 Zhang Jinlong1 Shen Hui1 Zhang Qiming1 Xu Qiang1 Yang Hongzhao1 Guo Qin1

Unit： 1. School of Materials Engineering Xi′an Aeronautical University 2. AVIC Xi′an Aircraft Industry (Group) Company Ltd.

KeyWords： Mg-Li alloy multiaxial compression severe plastic deformation microstructure mechanical properties

ClassificationCode：TG302

year,vol(issue):pagenumber：2022,47(9):250-255

Abstract：

The microstructure of multiaxial compression for Mg-Li alloy at room temperature was characterized by OM, SEM and XRD, and the evolution of microstructure and the change of mechanical properties during multiaxial compression deformation process were analyzed. The results show that Mg-Li alloy is composed of five phases of α-Mg, β-Li, fibrous Mg17Al12, granular MgLiAl2 and spherical AlLi. During compression, β-Li phase first produces slip and forms dislocation plugging, and the grain boundary is broken through and gradually disappears, the increasing of cumulative strain triggers the activation of α-Mg phase slip surface, and α-Mg phase and β-Li phase are continuously fused at the phase interface, even integrated. Mg17Al12 phase is divided into short fibers or small particles, and MgLiAl2 phase gradually loses its straight arrangement and is finally evenly distributed in β-Li phase. The hardness increases with the increasing of deformation degree, which is significant in the initial and later stages, and gentle in the middle stage. When the cumulative strain reaches 15.8, the hardness increases by 19.8%. The elongation of Mg-Li alloy can also be greatly improved while the deformation is strengthened. When the cumulative strain is 6.22, the tensile strength of the alloy is increased by 35%, and the elongation is increased by 82%.

Funds：

陕西省自然科学基础研究计划资助项目（2019JM-247）；西安航空学院校级科研基金项目（2019KY1229）；大学生创新创业训练计划项目（S202011736005）

朱嵩琦（1988-），男，学士 E-mail：742791330@qq.com 通信作者：张金龙（1976-），男，博士，教授 E-mail：zjl24931@163.com

Reference：

[1]Wu R Z, Yan Y D, Wang G X, et al. Recent progress in magnesium-lithium alloys[J]. International Materials Reviews, 2015, 60(2): 65-100.

[2]Jia Q, Wang Y, Wu R Z, et al. High specific strength Mg-Li-Zn-Er alloy processed by multi deformation processes[J]. Materials Characterization, 2020, 160: 110135.

[3]Li X Q, Ren L, Le Q C, et al. The hot deformation behavior, microstructure evolution and texture types of as-cast Mg-Li alloy[J]. Journal of Alloys and Compounds, 2020, 831: 154868.

[4]Zhang T, Tokunaga T, Ohno M, et al. Low Temperature superplasticity of a dual-phase Mg-Li-Zn alloy processed by a multi-mode deformation process[J]. Materials Science and Engineering A, 2018, 737: 61-68.

[5]Guo F, Jiang L Y, Ma Y L, et al. Strengthening a dual-phase Mg-Li alloy by strain-induced phase transformation at room temperature[J]. Scripta Materialia, 2020, 179: 16-19.

[6]Karami M, Mahmudi R. Work hardening behavior of the extruded and equal-channel angularly pressed Mg-Li-Zn alloys under tensile and shear deformation modes[J]. Materials Science and Engineering A, 2014, 607:512-520.

[7]Wu L B, Cui C L, Wu R Z, et al. Effects of Ce-rich RE additions and heat treatment on the microstructure and tensile properties of Mg-Li-Al-Zn-based alloy[J]. Materials Science and Engineering A, 2011, 528(4): 2174-2179.

[8]Cao F R, Xia F, Hou H L, et al. Effects of high-density pulse current on mechanical properties and microstructure in a rolled Mg-9.3Li-1.79Al-1.61Zn alloy[J]. Materials Science and Engineering A, 2015, 637: 89-97.

[9]Xu T C，Peng X D，Qin J，et al. Dynamic recrystallization behavior of Mg-Li-Al-Nd duplex alloy during hot compression[J]. Journal of Alloys and Compounds，2015，639：79-88.

[10]Xu D K，Li C Q，Wang B J，et al. Effect of icosahedral phase on the crystallographic texture and mechanical anisotropy of duplex structured Mg-Li alloys[J]. Materials and Design，2015，88：88-97.

[11]Cao F R, Zhou B J, Ding X, et al. Mechanical properties and microstructural evolution in a superlight Mg-7.28Li-2.19Al-0.091Y alloy fabricated by rolling[J]. Journal of Alloys and Compounds, 2018, 745: 436-445.

[12]Zhao J, Zhang J, Liu W C, et al. Effect of Y content on microstructure and mechanical properties of as-cast Mg-8Li-3Al-2Zn alloy with duplex structure[J]. Materials Science and Engineering, 2016, 650: 240-247.

[13]Peng X, Wu G H, Xiao L, et al. Effects of Ce-rich RE on microstructure and mechanical properties of as-cast Mg-8Li-3Al-2Zn-0.5Nd alloy with duplex structure[J]. Progress in Natural Science, 2019, 29(1): 103-109.

[14]高占奎, 王先飞, 刘文才, 等. 镁锂合金时效行为研究现状及展望[J]. 特种铸造及有色合金, 2018, 38(11): 1198-1203.

Gao Z K, Wang X F, Liu W C, et al. Research status and progress in aging behavior of Mg-Li alloy[J]. Special Casting and Nonferrous Alloys, 2018, 38(11): 1198-1203.

[15]Sun L G, Wu G, Wang Q, et al. Nanostructural metallic materials: Structures and mechanical properties[J]. Materials Today, 2020, 38: 114-135.

[16]Wang B, Juan L I, Sun J, et al. Shear localization and its related microstructural evolution in the ultrafine grained titanium processed by multi-axial compression[J]. Materials Science and Engineering A, 2014, 612(612): 227-235.

[17]Rezaee-Bazzaz A, Ahmadian S. Modeling of mechanical behavior of ultra fine grained aluminum produced by multiple compressions in a channel die[J]. Materials and Design, 2012, 34: 230-234.

[18]杨续跃, 孙争艳, 张雷. 室温多向多道次压缩变形制备亚微米和纳米级镁合金[J]. 金属学报, 2010, 46(5): 607-612.

Yang X Y, Sun Z Y, Zhang L. Preparation of submicro and nanosized magnesium alloys by multiply compressed deformation[J]. Acta Metallurgica Sinica, 2010, 46(5): 607-612.

[19]Liu G, Xie W, Hadadzadeh A, et al. Hot deformation behavior and processing map of a superlight dual-phase Mg-Li alloy[J]. Journal of Alloys and Compounds, 2018, 766(1): 460-469.

[20]Cao F R, Xue G Q, Xu G M. Superplasticity of a dual-phase-dominated Mg-Li-Al-Zn-Sr alloy processed by multidirectional forging and rolling[J]. Materials Science and Engineering A, 2017, 704:360-374.

[21]张金龙, 路恩皓, 朱均, 等. Mg-9.5Li-2.56Al-2.58Zn合金组织及室温变形行为[J]. 稀有金属材料与工程, 2021, 50(4): 1359-1364.

Zhang J L, Lu E H, Zhu J, et al. Microstructure and room temperature deformation behavior of Mg-9.5Li-2.56Al-2.58Zn alloy[J]. Rare Metal Materials and Engineering, 2021, 50(4): 1359-1364.

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