Multi-stage Devitrification Behavior of Mg₆₅Cu₂₅Tb₁₀ Bulk Metallic Glass

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Metallurgical and Materials Transactions A

OSTI ID:951077

Yang, Ling ^[1]; Wang, Xun-Li ^[1]; Stoica, Alexandru Dan ^[1]; Almer, Jon ^[2]; Shi, D. ^[3]; Wang, W. H. ^[4]

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1. ORNL
2. Argonne National Laboratory (ANL)
3. University of Cincinnati
4. Chinese Academy of Sciences

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: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: Work for Others (WFO)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 951077
• Journal Information: Metallurgical and Materials Transactions A, Vol. 10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
METALLIC GLASSES
MAGNESIUM ALLOYS
COPPER ALLOYS
TERBIUM ALLOYS
DECOMPOSITION
CRYSTALLIZATION
DISTRIBUTION FUNCTIONS
PHASE STUDIES