Strain localization and damage development in 2060 alloy during bending

The microstructure evolution and damage development of the third-generation Al-Li alloy 2060 （T8） were studied using in situ bending tests. Specimens were loaded with a series of punches of different radii, and the microstructure evolution was studied by scanning electron microscopy, electron backsc...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2015-12, Vol.22 (12), p.1313-1321
Main Authors: Jin, Xiao, Fu, Bao-qin, Zhang, Cheng-lu, Liu, Wei
Format: Article
Language:English
Subjects:
Alloy development
Aluminum base alloys
Aluminum-lithium alloys
Bending
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Corrosion and Coatings
Crack initiation
Crack propagation
Damage
Damage localization
Digital imaging
Ductile fracture
Edge dislocations
Electron backscatter diffraction
Electron imaging
Evolution
Fracture mechanics
Free surfaces
Glass
Heat treating
Localization
Materials Science
Metallic Materials
Microstructure
Natural Materials
Precipitates
Shear bands
Strain
Strain distribution
Strain localization
Surfaces and Interfaces
Thin Films
Tribology
应变局部化
弯曲过程
微观组织演变
微观结构演化
扫描电子显微镜
损伤发展
电子背散射衍射
铝锂合金
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Summary:The microstructure evolution and damage development of the third-generation Al-Li alloy 2060 （T8） were studied using in situ bending tests. Specimens were loaded with a series of punches of different radii, and the microstructure evolution was studied by scanning electron microscopy, electron backscatter diffraction, and digital image correlation （DIC） methods. The evolution of the microscopic fracture strain distribution and microstructure in 2060 alloy during bending was characterized, where the dispersion distribution of precipitates was recorded by backscattered electron imaging and later inputted into a DIC system for strain calculations. The experimental results showed that strain localization in the free surface of bent specimens induced damage to the microstructure. The region of crack initiation lies on the free surface with maximum strain, and the shear crack propagates along the macro-shear band in the early stages of bending. Crack propagation in the later stages was interpreted on the basis of the conventional mechanism of ductile fracture.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-015-1199-3