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