晶界特征对AA2099铝锂合金疲劳加载分层断裂影响探究

doi:10.11896/cldb.21030256

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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.

Key words： Al-Li alloys crystallographic texture grain boundary features delamination

Published: Online: 2022-05-24

CLC number:

TG146

Fund:National Natural Science Foundation of China (51871038) and Technology Innovation and Application Key Projects of Chongqing (cstc2019jscx-mbdxX0025).

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	QIU Weiyi
	ZHU Xianghui
	HUANG Weijiu
	YANG Xusheng
	WANG Xin

Cite this article:

QIU Weiyi,ZHU Xianghui,HUANG Weijiu, et al. Research on the Effects of Grain Boundary Features on Delaminations of AA2099 Al-Li Alloy Under Fatigue Loading[J]. Materials Reports, 2022, 36(10): 21030256-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21030256 OR http://www.mater-rep.com/EN/Y2022/V36/I10/21030256

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