Damage prediction of 7025 aluminum alloy during equal-channel angular pressing

Equal-channel angular pressing （ECAP） is a prominent technique that imposes severe plastic deformation into materials to en- hance their mechanical properties. In this research, experimental and numerical approaches were utilized to investigate the mechanical prop- erties, strain behavior, and damag...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2014-10, Vol.21 (10), p.990-998
Main Authors: Ebrahimi, M., Attarilar, Sh, Gode, C., Djavanroodi, F.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Ceramics
Channels
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coefficient of friction
Composites
Corrosion and Coatings
Cracks
Damage
Deformation
Deformation analysis
ECAP
Equal channel angular pressing
Finite element method
Friction
Glass
Grain refinement
Materials Science
Mathematical analysis
Mechanical properties
Metallic Materials
Natural Materials
Plastic deformation
Strain
Surface cracks
Surfaces and Interfaces
Thin Films
Tribology
Ultimate tensile strength
应变行为
挤压
极限抗拉强度
转角
通道
铝合金
震害预测
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Summary:Equal-channel angular pressing （ECAP） is a prominent technique that imposes severe plastic deformation into materials to en- hance their mechanical properties. In this research, experimental and numerical approaches were utilized to investigate the mechanical prop- erties, strain behavior, and damage prediction of ECAPed 7025 aluminum alloy in various conditions, such as die channel angle, outer comer angle, and friction coefficient. Experimental results indicate that, after the first pass, the yield strength, ultimate tensile strength, and hardness magnitude are improved by approximately 95%, 28%, and 48.5%, respectively, compared with the annealed state, mainly due to grain re- finement during the deformation. Finite element analysis shows that the influence of die channel angle is more important than that of outer comer angle or friction coefficient on both the strain behavior and the damage prediction. Also, surface cracks are the main cause of damage during the ECAP process for every die channel angle except for 90°; however, the cracks initiated from the neighborhood of the central re- gions are the possible cause of damage in the ECAPed sample with the die channel angle of 90°.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-014-1000-z