Achieving room temperature superplasticity in the Zn-0.5Cu alloy processed via equal channel angular pressing
The Zn-0.5Cu alloy was investigated in as-cast, homogenized state and after carrying out equal channel angular pressing four times at room temperature via route BC. Microstructure analysis using light microscopy and SEM/EBSD was performed, as well as tensile tests, misorientation angle distribution...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 723; pp. 126 - 133 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
18.04.2018
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | The Zn-0.5Cu alloy was investigated in as-cast, homogenized state and after carrying out equal channel angular pressing four times at room temperature via route BC. Microstructure analysis using light microscopy and SEM/EBSD was performed, as well as tensile tests, misorientation angle distribution and texture analysis. The initial microstructure with the average grain size of 560 µm was refined to a grain size of approx. 1 µm. The obtained microstructure consists of uniaxial grains separated mostly by high angle grain boundaries. Mechanical characterization was performed at strain rates from 2 × 10−6 s−1 to 1 s−1 at room temperature. Ultrafine-grained zinc-copper alloy exhibited 510% elongation with the strain rate sensitivity equal 0.31, which was the first observation of room temperature superplasticity in Zn-Cu alloys. Based on the microstructure, misorientation angle and texture analysis, the main operating deformation mechanisms were distinguished for samples deformed at strain rates from 2 × 10−5 s−1 to 10−1 s−1. |
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ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2018.03.052 |