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金属学报  2022, Vol. 58 Issue (1): 114-128    DOI: 10.11900/0412.1961.2021.00222
  研究论文 本期目录 | 过刊浏览 |
“工艺-组织-性能”模拟研究Mg-Gd-Y合金混晶组织
李少杰1, 金剑锋1,2(), 宋宇豪1, 王明涛1, 唐帅2, 宗亚平1, 秦高梧1()
1. 东北大学 材料科学与工程学院 沈阳 110819
2. 东北大学 轧制技术及连轧自动化国家重点实验室 沈阳 110819
Multimodal Microstructure of Mg-Gd-Y Alloy Through an Integrated Simulation of “Process-Structure-Property”
LI Shaojie1, JIN Jianfeng1,2(), SONG Yuhao1, WANG Mingtao1, TANG Shuai2, ZONG Yaping1, QIN Gaowu1()
1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
引用本文:

李少杰, 金剑锋, 宋宇豪, 王明涛, 唐帅, 宗亚平, 秦高梧. “工艺-组织-性能”模拟研究Mg-Gd-Y合金混晶组织[J]. 金属学报, 2022, 58(1): 114-128.
Shaojie LI, Jianfeng JIN, Yuhao SONG, Mingtao WANG, Shuai TANG, Yaping ZONG, Gaowu QIN. Multimodal Microstructure of Mg-Gd-Y Alloy Through an Integrated Simulation of “Process-Structure-Property”[J]. Acta Metall Sin, 2022, 58(1): 114-128.

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摘要: 

以Mg-8Gd-3Y-0.5Zr (GW83K)镁合金为研究对象，探索通过调控混晶显微组织来提高其力学性能的途径。将具有混晶组织的合金抽象为一种不同尺寸的晶粒嵌入到晶界中的颗粒复合体模型，在该模型中基体相为晶界，不同的颗粒相是不同尺寸的晶粒；然后基于Taylor关系的非局部塑性理论修正不同粒子嵌入到基体后对基体性能的影响，建立具有混晶组织特征的有限元平面应变细观力学模型。采用该模型模拟了含有混晶组织的GW83K镁合金在拉伸条件下的应力-应变行为，模拟结果对比实验数据验证了模型的有效性。在此基础上，通过真实时空相场模拟出的不同退火工艺下的混晶组织作为力学模型的几何输入参数，建立“工艺参数-混晶组织-力学性能”之间的关系。模拟结果对比发现，具有混晶组织的GW83K镁合金强度随平均晶粒尺寸的变化符合Hall-Petch关系，粗晶含量和分布显著影响着合金的塑性，当合金在623 K下退火90 min后对应的混晶组织可在保持高强度的同时有效提升塑性，为混晶组织的设计提供了参考。
关键词 ： 镁合金,  混晶组织,  力学性能,  显微组织设计,  有限元法    
Abstract：

Rare earth Mg alloys containing Gd elements can be used in aerospace, automotive, and other industrial fields owing to their high strength and creep resistance at room and high temperatures. However, the poor ductility of Mg alloys limits their application. Recently, it was discovered that the ductility of Mg alloy can be improved without compromising on its strength if sufficient amount of coarse grains is distributed in fine grains. In this study, taking the Mg-8Gd-3Y-0.5Zr (GW83K) alloy as an example, an approach for optimizing multimodal microstructures was investigated, which aimed to improve the mechanical properties of alloys. An alloy with a multimodal grain structure can be used as a particulate compound model, in which the grain boundary is considered the matrix, and different-sized grains are treated as different-types of particles embedded into the grain boundary matrix. A 2D finite element micromechanics model combined with Taylor-based nonlocal plasticity theory, which considers the size effect of the particles, was established to simulate the mechanical response of the multimodal structure Mg alloy in a tensile test. The model was verified through the experimental data of the stress-strain curve. Moreover, the effects of process parameters on the mechanical properties of the GW83K alloy were further evaluated by combining the grain structure under different annealing processes, simulated from a real space-time phase-field model as the geometric input of the finite element model. Finally, the relationships between the annealing parameters, multimodal structure, and mechanical properties of the GW83K alloy were described. The results show that the yield and tensile strengthes of the multimodal GW83K alloy presented a Hall-Petch relationship with the average grain size. The content and distribution of coarse grains greatly affected the plasticity of the GW83K alloy. By annealing the GW83K alloy at 623 K for 90 min, better plasticity could be achieved without sacrificing strength, which is helpful in promoting multimodal microstructural design.
Key words： magnesium alloy    multimodal grain    mechanical property    microstructural design    finite element method
收稿日期: 2021-05-21     
ZTFLH:  TG113.25  
基金资助:国家重点研发计划项目(2016YFB0701204);高等学校学科创新引智计划项目(B20029);中央高校基本科研业务费专项资金项目(N2007011)
作者简介: 李少杰，男，1995年生，博士生
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李少杰
金剑锋
宋宇豪
王明涛
唐帅
宗亚平
秦高梧

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00222      或      https://www.ams.org.cn/CN/Y2022/V58/I1/114

图1  GW83K镁合金在623、673和723 K时的自由能成分点和拟合曲线
T A A 1 A 2 B 1 B 2 ˆL c 1 ϕ 2nd f 2nd d 2nd
K kJ·mol-1 kJ·mol-1 kJ·mol-1 kJ·mol-1 kJ·mol-1 mol·s-1·J-1 % μm
623 -49.2 297.3 -775.2 371 51.2 0.45 0.46 Lath 0.67 1-2
673 -52.6 308 -869.6 365.7 51.2 1.22 0.46 Lath 1.35 1-2
723 -55.9 322.4 -901.1 373.7 51.2 2.72 0.46 Sphere 1.35 1-2
表1  晶粒生长相场模型中的参数
图2  不同退火工艺下相场模拟与实验[67]得到的平均晶粒尺寸
图3  真实混晶组织有限元模型构建示意图
图4  具有不同晶粒尺寸的单晶粒相GW83K镁合金的实验拉伸应力-应变曲线及其本构输入曲线
图5  GW83K镁合金有限元模型的模拟结果
Model Annealing temperature Annealing time
No. K min
1 623 60
2 623 75
3 623 90
4 673 60
5 673 75
6 673 90
7 723 60
8 723 75
9 723 90
表2  GW83K镁合金相场模型中不同退火温度与退火时间的取值
图6  不同退火工艺的GW83K镁合金显微组织与晶粒尺寸分布
图7  不同退火温度、退火时间下的GW83K镁合金再结晶晶粒组织图及有限元几何模型(对应为模型Nos.1~9)
图8  GW83K镁合金的9个有限元模型中晶界占比、平均晶粒尺寸和晶粒尺寸分布
图9  不同退火工艺的GW83K镁合金有限元模型模拟结果
图10  经过723 K退火90 min后，有/无第二相粒子的GW83K镁合金有限元模拟结果
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