Research on the Effects of Grain Boundary Features on Delaminations of AA2099 Al-Li Alloy Under Fatigue Loading
QIU Weiyi1,2, ZHU Xianghui1,3 , HUANG Weijiu1,2,3,*, YANG Xusheng2 , WANG Xin1,2
1 Faculty of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China 2 Institute of New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China 3 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract: The delamination behavior of AA2099 Al-Li alloy under fatigue loading was studied from the perspectives of crystallographic texture and grain boundary features by means of electron backscattered diffraction (EBSD) and back scattered electron (BSE) imaging. The results showed that the delamination of AA2099 Al-Li alloy mostly occured along the high angle grain boundaries. The grains near delamination were mostly in Brass orientation and the delamination fractures were approximately paralleled to the {110} plane of the grains. The tortuosity of grain boundary remarkably affects the delamination behavior. Compared with T81 specimen and T83 specimen, the grain boundaries of solution treatment (ST) specimen were more tortuous. The delamination fractures could hardly be found in ST specimen due to the tortuous grain boundaries. With the increased pre-stretch strain, the morphology of grain boundary precipitates in T83 specimen were quite different from that in T81 specimen. During the cyclic load, the interface decohesion of the coarse grain boundary precipitates in T83 specimen intensified the delamination. Thus, the extents of delamination could be ordered as following: T83 specimen > T81 specimen > ST specimen.
作者简介: 仇伟夷,重庆理工大学2018级材料学硕士研究生,于2019年12月至2021年3月在重庆文理学院新材料技术研究中心联合培养学习,主要从事新型铝锂合金失效分析领域研究。 黄伟九,重庆文理学院教授、博士生导师,国家万人计划科技创新领军人才,新世纪百千万人才工程国家级人选。1998年10月毕业于中南大学,获工学博士学位。主要从事材料表面改性及新型铝锂合金组织性能的研究。在Journal of Materials Science and Technology, Materials Science and Engineering: A, Journal of Alloys and Compounds,《中国有色金属学报》《材料导报》等期刊发表论文280余篇(其中SCI收录86篇,EI收录128篇)。
引用本文:
仇伟夷, 祝祥辉, 黄伟九, 杨绪盛, 汪鑫. 晶界特征对AA2099铝锂合金疲劳加载分层断裂影响探究[J]. 材料导报, 2022, 36(10): 21030256-5.
QIU Weiyi, ZHU Xianghui , HUANG Weijiu, YANG Xusheng , WANG Xin. Research on the Effects of Grain Boundary Features on Delaminations of AA2099 Al-Li Alloy Under Fatigue Loading. Materials Reports, 2022, 36(10): 21030256-5.
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2022, Vol. 36 
