In-situ surface study of the mechanism of high temperature deformation in an Al-Cu-Li alloy

•The high temperature deformation mechanism was studied by surface grids created by FIB.•Inhomogeneous grain structure is the main factor affecting the elongation.•Intragranular dislocation slip is the dominant mechanism. The 2195 Al-Cu-Li alloy is able to obtain an elongation of 203% by high temper...

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Bibliographic Details
Published in:Materials letters 2023-04, Vol.336, p.133889, Article 133889
Main Authors: Li, Jun, Ye, Lingying, Liu, Xiaodong, Dong, Yu
Format: Article
Language:English
Subjects:
Grain boundaries
High temperature deformation
Metals and alloys
Microstructure
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Summary:•The high temperature deformation mechanism was studied by surface grids created by FIB.•Inhomogeneous grain structure is the main factor affecting the elongation.•Intragranular dislocation slip is the dominant mechanism. The 2195 Al-Cu-Li alloy is able to obtain an elongation of 203% by high temperature stretching. The microstructure evolution and deformation mechanism of non-recrystallized Al-Cu-Li alloy after high temperature stretching were studied. The results show that the inhomogeneous grain structure is the main factor affecting the elongation. High resolution surface studies with focus ion beam show that intragranular dislocation slip provides up to 57% of the total strain and grain boundary sliding plays an accommodating role.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2023.133889