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Microstructure evolution and processing map of Al–Cu–Li–Mg–Ag alloy.

Authors :
Yang, Qingbo
Lei, Lin
Fan, Xiangze
Jia, Zhihong
Zhang, Zhiqing
Li, Weiguo
Liu, Qing
Source :
Materials Chemistry & Physics. Nov2020, Vol. 254, pN.PAG-N.PAG. 1p.
Publication Year :
2020

Abstract

Microstructural evolution of AA2195 aluminum alloy was recorded under different conditions (400–500 °C/0.01–10 s−1) during isothermal compression via metallurgical microscopy, electron backscattered diffraction and transmission electron microscopy/scanning transmission electron microscopy. By means of the dynamic material modeling, the processing map (PM) at the strain of 0.7 was also constructed using flow stress data. It was shown that the unstable criterion was adiabatic shear band (ASB) and flow localization (FL). ASB was easily formed at high strain rates (>1 s−1) due to non-uniform deformation heating. FL was attributed to local coarseness of T 1 precipitates near grain boundaries or inhomogeneous distribution of T 1 precipitates in the matrix. The stability domain showed that the absence of T 1 precipitates contributed to the formation of fine homogeneously distributed continuous dynamic recrystallization (CDRX). In the light of PM and microscopic observation, the optimal processing conditions suitable for AA2195 aluminum alloy were proposed as 475–500 °C/0.01–0.1 s−1 with an exception of 490–500 °C/0.01 s−1. Image 1 • Processing map for AA2195 aluminum alloy is established. • At high strain rates, non-uniform deformation heating induces adiabatic shear band. • Under moderate deformation conditions, the instable criterion is flow localization. • Flow localization is attribute to localized T 1 precipitates. • At the high temperature, the absence of T 1 precipitates makes contribution to CDRX. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02540584
Volume :
254
Database :
Academic Search Index
Journal :
Materials Chemistry & Physics
Publication Type :
Academic Journal
Accession number :
145517718
Full Text :
https://doi.org/10.1016/j.matchemphys.2020.123256