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Variation of the uniaxial tensile behavior of ultrafine-grained pure aluminum after cyclic pre-deformation.
- Source :
- International Journal of Minerals, Metallurgy & Materials; Jun2018, Vol. 25 Issue 6, p663-671, 9p
- Publication Year :
- 2018
-
Abstract
- To explore the influence of cyclic pre-deformation on the mechanical behavior of ultrafine-grained (UFG) materials with a high stacking fault energy (SFE), UFG Al processed by equal-channel angular pressing (ECAP) was selected as a target material and its tensile behavior at different pre-cyclic levels D (D = N<subscript>i</subscript> / N<subscript>f</subscript>, where N<subscript>i</subscript> and N<subscript>f</subscript> are the applied cycles and fatigue life at a constant stress amplitude of 50 MPa, respectively) along with the corresponding microstructures and deformation features were systematically studied. The cyclic pre-deformation treatment on the ECAPed UFG Al led to a decrease in flow stress, and a stress quasi-plateau stage was observed after yielding for all of the different-state UFG Al samples. The yield strength σ<subscript>YS</subscript>, ultimate tensile strength σ<subscript>UTS</subscript>, and uniform strain ɛ exhibited a strong dependence on D when D ≤ 20%; however, when D was in the range from 20% to 50%, no obvious change in mechanical properties was observed. The micro-mechanism for the effect of cyclic pre-deformation on the tensile properties of the ECAPed UFG Al was revealed and compared with that of ECAPed UFG Cu through the observations of deformation features and microstructures. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16744799
- Volume :
- 25
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- International Journal of Minerals, Metallurgy & Materials
- Publication Type :
- Academic Journal
- Accession number :
- 129855661
- Full Text :
- https://doi.org/10.1007/s12613-018-1613-8