The Effect of Particles on Microstructure and Mechanical Behaviour of Mg-10Gd-3Y-0.4Zr Alloy Processed by ECAP

Abstract:

An Mg-10Gd-3Y-0.4Zr alloy (GW103K) was processed by equal-channel angular pressing (ECAP) for 1-6 passes at 663 K; and the evolution of microstructure during ECAP was studied by OM and XRD. After ECAP, the grain size was reduced from 65 μm (initial state) to 4.2 μm (6 passes), the β equilibrium phase precipitated gradually and the area fraction of β phase increased from 0.8% to 13.4%. The distribution of fine grain zones and second phase particles were coincident, which was consistent with PSN. During the ECAP process, the yield strength increased up to a peak and then decreased, and the elongation increased firstly, then decreased later and increased again. The optimal mechanical properties were obtained after 3 passes, which was attributed to the combined effect grain refinement and second phase particle strengthening.

• Periodical: Materials Science Forum (Volume 765)
• Pages: 444-448
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.444
• Online since: July 2013
• Authors: Yin Peng Zhou, De Jiang Li, Xiao Qin Zeng, Wen Jiang Ding
• Keywords: ECAP, Grain Refinement, Mg-Gd-Y-Zr Alloy, PSN, Second Phase

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