Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 481, Issue 1-2, Pages 296-300Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.03.166
Keywords
Mg-Gd-Y-Zr alloy; Extrusion; Superplastic mechanism; Second phases
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Funding
- National Security Basic Research Program, China [5133001E]
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Superplastic mechanism and microstructure of Mg-Gd-Y-Zr alloy extruded rod with an initial grain size of 10 mu m were investigated. For the purposes, tensile tests at various temperatures and strain rates were conducted. The tests revealed that the material showed a maximum elongation of 410% at 450 degrees C and 2 x 10(-4) s(-1). The high ductility was attributed to grain boundary sliding accommodated by dislocation motion assisted by lattice diffusion. It is suggested from microstructural analysis results that second phases, cuboidal Mg3Gd and irregular-shaped beta, exhibited significant effect of pinning grain boundaries, and that the irregular-shaped P was deformable and the strain was partly transferred from the matrix to beta phases. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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