Multistage devitrification behavior of Mg{sub 65}Cu{sub 25}Tb{sub 10} bulk metalic glass.
The devitrification of Mg{sub 65}Cu{sub 25}Tb{sub 10} bulk metallic glass (BMG) has been studied by time-resolved small angle X-ray scattering (SAXS) and wide angle X-ray 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 quenched-in short-range orders. Crystallization proceeds in three stages. During stage I, icosahedral clusters are formed that transforms to a quasi-crystalline 1/1 approximant during stage II, accompanied by the formation of cubic TbMg{sub 3}. In stage III, the 1/1 approximant transforms to a 2/1 approximant. The orthorhombic CuMg{sub 2} phase is formed at a higher temperature when the quasi-crystalline phase starts to decompose. Pair distribution functions were evaluated to demonstrate these structural evolutions in real space.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 951261
- Report Number(s):
- ANL/XSD/JA-63919; MMTAEB; TRN: US200911%%405
- Journal Information:
- Metall. Mater. Trans. A, Vol. 39, Issue 8 ; Aug. 2008; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- ENGLISH
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