<strong>Mg-4.4Li-2.5Zn-0.46Al-0.74Y</strong>合金高温变形流动应力、组织演变与本构分析

doi:10.11900/0412.1961.2020.00306

金属学报

2021, Vol. 57

Issue (7): 860-870 DOI: 10.11900/0412.1961.2020.00306

研究论文

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Mg-4.4Li-2.5Zn-0.46Al-0.74Y合金高温变形流动应力、组织演变与本构分析

曹富荣¹^,²^,³(

), 丁鑫¹^,⁴, 项超¹, 尚会会¹

^1.东北大学材料科学与工程学院沈阳 110819
^2.东北大学轻质结构材料辽宁省重点实验室沈阳 110819
^3.东北大学轧制与连轧自动化国家重点实验室沈阳 110819
^4.四川航天长征装备制造有限公司成都 610000

Flow Stress, Microstructural Evolution, and Constitutive Analysis During High-Temperature Deformation in Mg-4.4Li-2.5Zn-0.46Al-0.74Y Alloy

CAO Furong¹^,²^,³(

), DING Xin¹^,⁴, XIANG Chao¹, SHANG Huihui¹

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Key Laboratory of Lightweight Structural Materials Liaoning Province, Northeastern University, Shenyang 110819, China
^3.State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
^4.Sichuan Aerospace Changzheng Equipment Manufacturing Co. , Ltd. , Chengdu 610000, China

引用本文:

曹富荣, 丁鑫, 项超, 尚会会. Mg-4.4Li-2.5Zn-0.46Al-0.74Y合金高温变形流动应力、组织演变与本构分析[J]. 金属学报, 2021, 57(7): 860-870.
Furong CAO, Xin DING, Chao XIANG, Huihui SHANG. Flow Stress, Microstructural Evolution, and Constitutive Analysis During High-Temperature Deformation in Mg-4.4Li-2.5Zn-0.46Al-0.74Y Alloy[J]. Acta Metall Sin, 2021, 57(7): 860-870.

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摘要:

采用多向锻造与轧制(MDFR)制备了Mg-4.4Li-2.5Zn-0.46Al-0.74Y合金，利用拉伸机、OM和XRD等研究了热拉伸流动应力、组织演变、本构模型与变形机理。结果表明，合金多向锻造晶粒细化机理为机械式剪切破碎与动态再结晶细化。合金在523~573 K时，热变形组织主要发生动态回复与动态再结晶；≥ 573 K时，热变形组织主要发生晶粒长大；在623 K发生由晶粒长大引起的应变硬化。合金退火组织由α(Mg)、β(Li)、Al₂Y、Al₁₂Mg₁₇、LiAl和Mg₂Y相组成。本构分析表明，合金应力指数为4.4，变形激活能为120.40 kJ/mol；623 K、1.67 × 10^-4 s^-1条件下，对应240%延伸率的位错密度和数量与原子扩散计算表明，合金在该条件下的变形机理为晶格扩散控制的位错蠕变。晶粒长大模型确定该条件下的晶粒长大指数q = 2，比例因子α' = 0.2。

关键词 ： Mg-Li合金, 热拉伸, 显微组织, 力学性能, 本构分析, 变形机理

Abstract：

Mg-Li alloys have potential applications in the aerospace, military, electronics, and automobile fields due to their superlight density, extremely high specific stiffness, high specific strength, damping, and electromagnetic shielding properties. Due to the limited slip systems of Mg and hcp-structured α(Mg) at room temperature, magnesium and α(Mg)-based alloys are difficult to deform; thus, it is significant to investigate the high-temperature deformation behavior to address this issue. Thus, in this study, an ultralight α(Mg)-based Mg-4.4Li-2.5Zn-0.46Al-0.74Y alloy was fabricated via multi-directional forging and rolling, and its flow stress, microstructural evolution, constitutive modeling, and deformation mechanism at elevated temperatures were investigated by tensile tests, OM, and XRD. The results indicate that the grain refinement mechanism of this alloy processed by multi-directional forging (MDF) exhibits mechanical shearing fragmentation and dynamic recrystallization (DRX). Additionally, the flow stress results demonstrate that strain-hardening occurred at 623 K due to grain coarsening, and microstructural evolution reveals that dynamic recovery and DRX occurred at tensile temperatures of 523-573 K; however, grain coarsening primarily appeared at 573 K (or more). XRD analysis demonstrates that this alloy comprised α(Mg), β(Li), Al₂Y, Al₁₂Mg₁₇, LiAl, and Mg₂Y phases, and hyperbolic sine constitutive analysis reveals that the stress exponent was 4.4 and the activation energy for deformation was 120.40 kJ/mol. The calculated results for dislocation density, number of dislocations in a grain, and atomic diffusion at 623 K and 1.67 × 10^-4 s^-1 corresponding to elongation-to-failure of 240% indicate that dislocation creep controlled by lattice diffusion governed the deformation mechanism under this condition. Predictions by grain growth models indicate that the calculated grain sizes were in good agreement with the practical grain sizes at 623 K and 1.67 × 10^-4 s^-1 when the grain growth factor was equal to 2 and proportional factor was 0.2.

Key words： Mg-Li alloy hot tension microstructure mechanical property constitutive analysis deformation mechanism

收稿日期: 2020-08-14

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(51334006)

作者简介: 曹富荣，男，1964年生，研究员，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00306 或 https://www.ams.org.cn/CN/Y2021/V57/I7/860

图1 相同应变速率不同温度下Mg-4.4Li-2.5Zn-0.46Al-0.74Y (LZAY4301)合金的真应力-真应变曲线

图2 LZAY4301合金高温变形前的显微组织

图3 LZAY4301合金退火态的XRD谱

图4 523~623 K不同应变速率下LZAY4301合金标距部位的OM像

表1 523~623 K不同应变速率下LZAY4301合金的晶粒尺寸与延伸率

图5 高温拉伸条件下LZAY4301合金的lnε˙-lnσ、lnε˙-σ、lnε˙-ln[sinh(ασ)]和ln[sinh(ασ)]-1 / T关系曲线

图6 lnZ-ln[sinh(ασ)]关系曲线以及计算应力与测量应力的比较

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