Investigation of the Twinning Mode in a Compressed Mg-10Gd-2Y-0.5Zr Alloy Assisted by Rietveld Refinement

Abstract:

This paper investigated the twinning mode in a homogenized Mg-10Gd-2Y-0.5Zr ingot compressed at 300 oC and 1 s-1 using transmission electron microscopy observation and schematic method. Details about the primary twinning mode was studied based on the minimum sear criterion by comparing the values of the four major twinning modes in the magnesium alloys. The results show that the twins are formed first by {10-11} primary twinning being step characteristics, and then the secondary twins are formed later around the step by {10-12}secondary twinning. The results also show that the XRD Rietveld refinement method is an effective means to obtain the lattice parameter and to calculate the twinning shear that has important effect on the primary twinning mode in a h.c.p alloy.

• Periodical: Advanced Materials Research (Volume 460)
• Pages: 57-61
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.460.57
• Online since: February 2012
• Authors: Qing Yu Hou, Jing Tao Wang, Zhen Yi Huang
• Keywords: Mg-Gd-Y Alloy, Minimum Shear Criterion, Rietveld Refinement, Twinning Mode

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