Thermal Deformation Behavior and Microstructure Properties Evolution of LAZ931 MG-Li Alloy

LYU Yunxiang; LU Zhen; WU Lianmei; LI Fei; YI Manman; GAO Shiqing; XIA Xiangsheng

doi:10.3969/j.issn.1674-6457.2025.07.015

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 138-144. DOI: 10.3969/j.issn.1674-6457.2025.07.015

Light Alloy Forming

Thermal Deformation Behavior and Microstructure Properties Evolution of LAZ931 MG-Li Alloy

LYU Yunxiang¹, LU Zhen^1,*, WU Lianmei², LI Fei², YI Manman², GAO Shiqing³, XIA Xiangsheng³

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Abstract

The work aims to investigate the thermal deformation behavior of LAZ931 MG-Li alloy, the impact of thermal deformation on its microstructure, and the influence of thermal deformation parameters on its mechanical properties. A hot compression deformation test was conducted on LAZ931 MG-Li alloy within a temperature range of 150-300 ℃ and strain rates of 10^-3 to 1 s^-1, yielding its hot compression curve. Its constitutive model and hot working diagram were established. The effect of hot deformation on the microstructure was examined. As-cast MG-li alloy was prepared by isothermal forging. The influence of deformation parameters on mechanical properties was explored. The microstructure of LAZ931 MLi-Laz931 alloy was significantly refined through dynamic recrystallization during the hot deformation process, and the grain size of the two phases gradually increased with the rise of deformation temperature and the decrease of the strain rate. Isothermal forging could significantly improve the mechanical properties of the alloy. As the deformation temperature increased and the strain rate decreased, the alloy's tensile strength and elongation exhibited a gradual decline. After forging at 250 ℃ and 10^-2 s^-1, the yield strength, tensile strength, and elongation reached 175 MPa, 195 MPa, and 21.8%, respectively. These values represent increases of 28%, 18%, and 82% compared with the original material. In conclusion, LAZ931 MG-Li alloy exhibits excellent hot working performance.

Key words

magnesium-lithium alloy / heat deformation / organizational evolution / dynamic recrystallization / mechanical property

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LYU Yunxiang, LU Zhen, WU Lianmei, LI Fei, YI Manman, GAO Shiqing, XIA Xiangsheng. Thermal Deformation Behavior and Microstructure Properties Evolution of LAZ931 MG-Li Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 138-144 https://doi.org/10.3969/j.issn.1674-6457.2025.07.015

References

[1] 王军武, 刘旭贺, 王飞超, 等. 航空航天用高性能超轻镁锂合金[J]. 军民两用技术与产品, 2013(6): 21-24.
WANG J W, LIU X H, WANG F C, et al.High- Performance Ultra-Light Mg-Li Alloy for Aerospace[J]. Dual Use Technologies & Products, 2013(6): 21-24.
[2] 冯凯, 李丹明, 何成旦, 等. 航天用超轻镁锂合金研究进展[J]. 特种铸造及有色合金, 2017, 37(2): 140-144.
FENG K, LI D M, HE C D, et al.Progress in Superlight Mg-Li Alloys for Aerospace Industry[J]. Special Casting & Nonferrous Alloys, 2017, 37(2): 140-144.
[3] WU R, YAN Y, WANG G, et al.Recent Progress in Magnesium-Lithium Alloys[J]. International Materials Reviews, 2015, 60(2): 65-100.
[4] WESTENGEN H.Magnesium Alloys for Structural Applications; Recent Advances[J]. Le Journal de Physique IV, 3(C7): C7-491-C7-501.
[5] WANG D, LIU S J, WU R Z, et al.Synergistically Improved Damping, Elastic Modulus and Mechanical Properties of Rolled Mg-8Li-4Y-2Er-2Zn-0.6Zr Alloy with Twins and Long-Period Stacking Ordered Phase[J]. Journal of Alloys and Compounds, 2021, 881: 160663.
[6] LI X Q, LE Q C, HU C L, et al.Hot Tensile Deformation Behaviour and Microstructure Evolution of Al₃La Phase Reinforced Mg-5Li-3Al-2Zn Alloy Formed In-Situ by La₂O₃ Particle[J]. Materials Characterization, 2022, 185: 111772.
[7] 彭翔, 刘文才, 吴国华. 镁锂合金的合金化及其应用[J]. 中国有色金属学报, 2021, 31(11): 3024-3043.
PENG X, LIU W C, WU G H.Alloying and Application of Mg-Li Alloys: A Review[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(11): 3024-3043.
[8] 孔姝婷, 曹富荣. 多向锻造道次对Mg-5.21Li-3.00 (Al-Si)-2.16Sn-1.90Y-0.93Er合金组织性能的影响[J]. 有色金属材料与工程, 2023, 44(4): 11-18.
KONG S T, CAO F R.Effect of Multidirectional Forging Pass on Microstructure and Properties of Mg- 5.21Li-3.00(Al-Si)-2.16Sn-1.90Y-0.93Er Alloy[J]. Nonferrous Metal Materials and Engineering, 2023, 44(4): 11-18.
[9] CHEN Z Y, TONG R, DONG Z C.Plastic Flow Characteristics of an Extruded Mg-Li-Zn-RE Alloy[J]. Rare Metal Materials and Engineering, 2013, 42(9): 1779-1784.
[10] 刘俊伟, 戴木海, 鲁世强, 等. LZ61镁锂合金热变形行为及微观组织研究[J]. 特种铸造及有色合金, 2019, 39(1): 1-5.
LIU J W, DAI M H, LU S Q, et al.Hot Deformation Behavior and Microstructure of LZ61 Alloy[J]. Special Casting & Nonferrous Alloys, 2019, 39(1): 1-5.
[11] 张梦娜. Mg-Li-Al-Y合金的强韧化机理及热变形行为研究[D]. 西宁: 青海大学, 2020.
ZHANG M N.Study on Strengthening and Toughening Mechanism and Thermal Deformation Behavior of Mg-Li-Al-Y Alloy[D]. Xining: Qinghai University, 2020.
[12] 李奕. 镁锂合金热变形行为及搅拌摩擦加工对其组织与性能影响研究[D]. 济南: 山东大学, 2022.
LI Y.Study on Hot Deformation Behavior of Mg-Li Alloy and the Effect of Friction Stir Processing on Its Microstructure and Properties[D]. Jinan: Shandong University, 2022.
[13] ZHOU Y C, CHEN Z Y, JI J H, et al.Dynamic Nano Precipitation Behavior of As-Cast Mg-4Li-4Zn-Y Alloy during High Temperature Deformation[J]. Materials Science and Engineering: A, 2017, 707: 110-117.
[14] ZHOU Y C, CHEN Z Y, JI J, et al.Optimization of Hot Deformation Parameters and Constitutive Analysis for As-Cast Mg-5Li-3Zn-0.3Y Alloy Using Processing Maps[J]. Journal of Materials Engineering and Performance, 2018, 27(9): 4606-4615.
[15] 苏泉. 镁锂合金电热处理及筒形件挤压成形工艺研究[D]. 哈尔滨: 哈尔滨工业大学, 2021.
SU Q.Study on Electrothermal Treatment of Mg-Li Alloy and Extrusion Forming Process of Cylindrical Parts[D]. Harbin: Harbin Institute of Technology, 2021.
[16] ZHOU Y C, CHEN Z Y, JI J H, et al.Effects of Second Phases on Deformation Behavior and Dynamic Recrystallization of As-Cast Mg-4.3Li-4.1Zn-1.4Y Alloy during Hot Compression[J]. Journal of Alloys and Compounds, 2019, 770: 540-548.
[17] SHALBAFI M, ROUMINA R, MAHMUDI R.Hot Deformation of the Extruded Mg-10Li-1Zn Alloy: Constitutive Analysis and Processing Maps[J]. Journal of Alloys and Compounds, 2017, 696: 1269-1277.
[18] LI C Q, XU D K, YU S, et al.Effect of Icosahedral Phase on Crystallographic Texture and Mechanical Anisotropy of Mg-4%Li Based Alloys[J]. Journal of Materials Science & Technology, 2017, 33(5): 475-480.
[19] WEI G B, PENG X D, HADADZADEH A, et al.Constitutive Modeling of Mg-9Li-3Al-2Sr-2Y at Elevated Temperatures[J]. Mechanics of Materials, 2015, 89: 241-253.
[20] SELLARS C M.Computer Modelling of Hot-Working Processes[J]. Materials Science and Technology, 1985, 1(4): 325-332.
[21] SELLARS C M, MCTEGART W J.On the Mechanism of Hot Deformation[J]. Acta Metallurgica, 1966, 14(9): 1136-1138.
[22] 王海宇, 帅美荣, 唐佳伟, 等. 铸态AZ31镁合金热变形行为研究[J]. 太原科技大学学报, 2020, 41(5): 373-377.
WANG H Y, SHUAI M R, TANG J W, et al.Study on Thermal Deformation Behavior of As-Cast AZ31 Magnesium Alloy[J]. Journal of Taiyuan University of Science and Technology, 2020, 41(5): 373-377.
[23] ZENER C, HOLLOMON J H.Effect of Strain Rate Upon Plastic Flow of Steel[J]. Journal of Applied Physics, 1944, 15(1): 22-32.
[24] LI J Q, LIU J, CUI Z S.Characterization of Hot Deformation Behavior of Extruded ZK60 Magnesium Alloy Using 3D Processing Maps[J]. Materials & Design (1980-2015), 2014, 56: 889-897.
[25] ROBSON J D, HENRY D T, DAVIS B.Particle Effects on Recrystallization in Magnesium-Manganese Alloys: Particle-Stimulated Nucleation[J]. Acta Materialia, 2009, 57(9): 2739-2747.