Authors: L Yang XL Wang AD Stoica J Almer D Shi WH Wang
Publish Date: 2008/01/11
Volume: 39, Issue: 8, Pages: 1947-1952
Abstract
The devitrification of Mg65Cu25Tb10 bulk metallic glass BMG has been studied by timeresolved small angle Xray scattering SAXS and wide angle Xray scattering WAXS simultaneously By analyzing the interference peaks on SAXS patterns and the Bragg peaks on WAXS patterns it is found that devitrification initiates by activation of quenchedin shortrange orders Crystallization proceeds in three stages During stage I icosahedral clusters are formed that transforms to a quasicrystalline 1/1 approximant during stage II accompanied by the formation of cubic TbMg3 In stage III the 1/1 approximant transforms to a 2/1 approximant The orthorhombic CuMg2 phase is formed at a higher temperature when the quasicrystalline phase starts to decompose Pair distribution functions were evaluated to demonstrate these structural evolutions in real spaceThis article is based on a presentation given in the symposium entitled “Bulk Metallic Glasses IV” which occurred February 25–March 1 2007 during the TMS Annual Meeting in Orlando Florida under the auspices of the TMS/ASM Mechanical Behavior of Materials CommitteeThis research was supported by the Division of Materials Sciences and Engineering Office of Basic Energy Sciences United States Department of Energy under Contract No DEAC0500OR22725 with UT–Battelle LLC Use of the Advanced Photon Source was supported by the United States Department of Energy Office of Science Office of Basic Energy Sciences under Contract No DEAC0206CH11357
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