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材料导报  2022, Vol. 36 Issue (7): 21020008-7    https://doi.org/10.11896/cldb.21020008
  金属与金属基复合材料 |
升温速率对AA2060铝锂合金中间形变热处理微观组织的影响
李朝阳1,2, 黄光杰1, 曹玲飞1,3, 曹宇1, 林林2
1 重庆大学材料与科学工程学院,重庆 400044
2 西南铝业(集团)有限责任公司,重庆 401326
3 重庆大学电子显微镜中心,重庆 400044
Effect of Heating Rate on Microstructural Evolution During Thermo-Mechanical Treatment Processing in AA2060 Alloy
LI Chaoyang1,2, HUANG Guangjie1, CAO Lingfei1,3, CAO Yu1, LIN Lin2
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2 Southwest Aluminum (Group) Co., Ltd., Chongqing 401326, China
3 Electron Microscopy Center, Chongqing University, Chongqing 400044, China
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摘要 对双级均匀化后随炉冷AA2060铝锂合金铸块进行5道次轧制变形,轧制温度在400 ℃,得到了预变形量50%的样品。再对预变形量50%的样品采用 Gleeble-3800 热模拟试验机进行温度为 450 ℃、应变速率为0.01 s-1的热模拟,并分别以5 ℃/s、10 ℃/s、20 ℃/s的升温速率将其加热到变形温度。结合透射电子显微镜(TEM)、电子背散射衍射(EBSD) 和背散射电子像(BSE)表征不同升温速率下析出相演变规律及再结晶微观组织结构。研究结果表明:升温速率降低将导致升温过程中θ′(Al2Cu)相的析出量和尺寸增大,而流变应力及加工硬化率相应降低。热变形过程中连续再结晶(CDRX)、不连续再结晶(DDRX)、亚动态再结晶(MDRX)均有发生,其中CDRX和MDRX是该工艺路线过程中的主要再结晶机制。另外,随着升温速率的增加,CDRX和MDRX的比例降低。
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李朝阳
黄光杰
曹玲飞
曹宇
林林
关键词:  AA2060铝锂合金  中间形变热处理  升温速率  再结晶  组织演变    
Abstract: The samples of AA2060 alloy were two-stage homogenized, then cooled in the furnace, and subsequently deformed through the five pass rol-ling at 400 ℃, with 50% pre-rolled samples obtained finally. The 50% pre-rolled samples were tested by Gleeble-3800 thermal simulation machine at 450 ℃ at strain rate of 0.01 s-1, and the hot compression of samples were carried out with heating rate of 5 ℃/s, 10 ℃/s and 20 ℃/s, respectively. The microstructure evolution of precipitates and recrystallization under different heating rates were characterized by transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and backscattered electron image (BSE). According to the results, the precipitation quantity and size of the θ′(Al2Cu) phase increase with the heating rate decreasing, while the strain stress and strain har-dening rate decrease. Continuous recrystallization (CDRX), discontinuous recrystallization (DDRX), and sub-dynamic recrystallization (MDRX) occur du-ring hot deformation, in which CDRX and MDRX are the mainly recrystallization mechanisms during the ITMP process. Moreover, with the increase of heating rate, the proportion of CDRX and MDRX decreases.
Key words:  AA2060 alloy    intermediate thermo-mechanical treatment process(ITMP)    heating rate    recrystallization    microstructure evolution
发布日期:  2022-04-07
ZTFLH:  TG335.5  
基金资助: 国家自然科学基金资助项目 (51421001);中央高校经费资助项目(2020CDJDCL001)
通讯作者:  gjhuang@cqu.edu.cn   
作者简介:  李朝阳,自2015年9月起在重庆大学材料科学与工程学院攻读博士学位。申请国家发明专利4项,发表SCI论文3篇,主要从事高性能铝锂合金的变形工艺设计与开发。
黄光杰,重庆大学材料科学与工程学院,教授,博士研究生导师,先后于1992年、2002年在重庆大学获得硕士和博士学位。于2003—2004年在加拿大McGill作访问学者,研究领域为金属塑性变形、再结晶与织构控制、镁合金板材加工技术、铝合金新材料与新工艺、先进轻合金成形技术,并已发表125篇SCI论文,主持国家和省部级项目12项,横向科研项目15项。
引用本文:    
李朝阳, 黄光杰, 曹玲飞, 曹宇, 林林. 升温速率对AA2060铝锂合金中间形变热处理微观组织的影响[J]. 材料导报, 2022, 36(7): 21020008-7.
LI Chaoyang, HUANG Guangjie, CAO Lingfei, CAO Yu, LIN Lin. Effect of Heating Rate on Microstructural Evolution During Thermo-Mechanical Treatment Processing in AA2060 Alloy. Materials Reports, 2022, 36(7): 21020008-7.
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http://www.mater-rep.com/CN/10.11896/cldb.21020008  或          http://www.mater-rep.com/CN/Y2022/V36/I7/21020008
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