固溶态<strong>Mg-10Gd-6Y-1.5Zn-0.5Zr</strong>合金热加工图构建及微观组织演变

doi:10.11900/0412.1961.2023.00225

金属学报

2025, Vol. 61

Issue (4): 632-642 DOI: 10.11900/0412.1961.2023.00225

研究论文

本期目录 | 过刊浏览

固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金热加工图构建及微观组织演变

包成利¹, 李豪¹, 胡励¹(

), 周涛¹, 唐明², 何曲波³, 刘相果⁴

1 重庆理工大学材料科学与工程学院重庆 400054
2 哈尔滨工程大学机电工程学院哈尔滨 150001
3 重庆材料研究院有限公司重庆 400707
4 重庆中镭科技有限公司重庆 400800

Construction of Hot Processing Map of Solutionized Mg-10Gd-6Y-1.5Zn-0.5Zr Alloy and Microstructure Evolution

BAO Chengli¹, LI Hao¹, HU Li¹(

), ZHOU Tao¹, TANG Ming², HE Qubo³, LIU Xiangguo⁴

1 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2 College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
3 Chongqing Material Research Institute Co. Ltd., Chongqing 400707, China
4 Chongqing Zhonglei Tech. Co. Ltd., Chongqing 400800, China

引用本文:

包成利, 李豪, 胡励, 周涛, 唐明, 何曲波, 刘相果. 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金热加工图构建及微观组织演变[J]. 金属学报, 2025, 61(4): 632-642.
Chengli BAO, Hao LI, Li HU, Tao ZHOU, Ming TANG, Qubo HE, Xiangguo LIU. Construction of Hot Processing Map of Solutionized Mg-10Gd-6Y-1.5Zn-0.5Zr Alloy and Microstructure Evolution[J]. Acta Metall Sin, 2025, 61(4): 632-642.

全文: PDF(3986 KB) HTML

摘要:

含长周期堆垛有序结构的Mg-RE-Zn合金的热变形行为及微观组织特征高度复杂。为拓展该类合金的工程应用，本研究在变形温度为350~500 ℃、应变速率为0.001~1 s^-1条件下对固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金进行热压缩实验，以研究该合金的热变形行为，构建其热加工图并确定热加工窗口；结合微观组织表征，研究该合金热变形过程中动态再结晶和长周期堆垛有序结构(LPSO)相扭折变形的相互作用。结果表明：该合金的流变应力随温度的升高和应变速率的降低而降低。在较高应变速率下，流变应力对温度的敏感性更高。在较低的温度下变形时，流变应力对应变速率的敏感性更高。基于Murty理论构建热加工图，发现在应变为0.7时存在2个最佳加工区域，位于变形温度400~450 ℃、应变速率0.001~0.027 s^-1和变形温度450~487 ℃、应变速率0.12~1 s^-1范围内。通过对所构建热加工图不同区域对应样品的微观组织表征(即再结晶晶粒的体积分数分析)，验证了热加工图的准确性。通过统计不同温度下流变曲线的软化应力(峰值应力-稳态应力)、再结晶晶粒体积分数和层状LPSO相扭折角，发现层状LPSO相的扭折变形程度随变形温度的升高而降低，再结晶晶粒体积分数随变形温度升高而升高，且层状LPSO相的扭折变形对动态再结晶具有抑制作用，流变曲线的软化应力受动态再结晶和层状LPSO相扭折变形的共同影响。

关键词 ： Mg-RE-Zn合金, 热变形行为, 热加工图, 动态再结晶, LPSO相扭折变形

Abstract：

Mg-rare earth (RE)-Zn alloys with long period stacking ordered (LPSO) phases have received extensive attention in the past few years because of their excellent mechanical properties compared with conventional wrought Mg alloys. However, the corresponding hot deformation behaviors and microstructure characteristics of Mg-RE-Zn alloys are rather complex. An in-depth investigation into this would broaden their engineering applications. In this work, hot compression experiments of solutionized Mg-10Gd-6Y-1.5Zn-0.5Zr alloys at 350-500 ^oC and a strain rate of 0.001-1 s^-1 have been conducted to investigate the hot deformation behavior, construct the hot processing map, and determine the hot working window. Afterward, the interaction between dynamic recrystallization (DRX) and kink deformation of LPSO phase during hot deformation has been studied through microstructure characterization. Results show that the flow stress decreases with the increase of temperature and the decrease of strain rate. When deformed at a relatively high strain rate, the sensitivity of flow stress to temperature is evident. When deformed at a relatively low temperature, the sensitivity of flow stress to strain rate is prominent. The corresponding hot processing map was constructed based on Murty criterion. Under a strain of 0.7, two optimal processing areas are found at 400-450 ^oC (0.001-0.027 s^-1) and 450-487 ^oC (0.12-1 s^-1). The accuracy of the constructed hot processing map has been verified by using microstructure characterization (via volume fraction analysis of recrystallized grains) of deformed samples, which correspond to different regions in the constructed hot processing map. By analyzing the softening stress of the flow curve at different temperatures (peak stress minus state stress), DRX volume fraction and kinking angle of the lamellar LPSO phase, the degree of kink deformation of the lamellar LPSO phase decreases with the increase of deformation temperature. In addition, the DRX volume fraction increases with the increase of deformation temperature. Moreover, the kink deformation of the lamellar LPSO phase has an inhibitory effect on DRX and the softening stress of the flow curve could be jointly affected by DRX and the kink deformation of the lamellar LPSO phase.

Key words： Mg-RE-Zn alloy hot deformation behavior hot processing map dynamic recrystallization kink deformation of LPSO phase

收稿日期: 2023-05-18

ZTFLH:

TG146.22

基金资助:中国博士后科学基金项目(2021M703592);重庆市博士后研究(一等)项目(2021XM1022);重庆市教育委员会科学技术研究项目(KJQN202101141);重庆市研究生创新项目(CYS22640);重庆理工大学本科生科研立项项目(KLA21024)

通讯作者: 胡励，huli@cqut.edu.cn，主要从事镁合金板材特种塑性加工及变形行为研究

Corresponding author: HU Li, associate professor, Tel: 17358428920, E-mail: huli@cqut.edu.cn

作者简介: 包成利，女，1997年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00225 或 https://www.ams.org.cn/CN/Y2025/V61/I4/632

图1 等温热压缩流程示意图

图2 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金的FESEM像和EDS元素面分布图

表1 图2a中固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金的EDS结果

图3 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金的OM像和晶粒尺寸分布图

图4 不同变形温度下固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金的真应力-真应变曲线

图5 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金峰值应力敏感性分析

图6 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金不同应变下的三维功率耗散系数图

图7 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金在不同应变条件下的热加工图

图8 不同变形条件下(图7d中A~E) Mg-10Gd-6Y-1.5Zn-0.5Zr合金变形样品的EBSD像和再结晶体积分数

图9 固定应变速率(0.01 s-1)不同温度下Mg-10Gd-6Y-1.5Zn-0.5Zr合金变形样品的OM像

图10 图9变形样品中层状LPSO相扭折角度和再结晶晶粒分数统计

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