TY - JOUR
T1 - Modification of atomic mobility in a Ti-based bulk metallic glass by plastic deformation or thermal annealing
AU - Qiao, J. C.
AU - Pelletier, J. M.
AU - Kou, H. C.
AU - Zhou, X.
PY - 2012/9
Y1 - 2012/9
N2 - Evolution of atomic mobility in a Ti 40Zr 25Ni 8Cu 9Be 18 bulk metallic glass was studied by dynamic mechanical analysis (DMA) in different states: as-cast, after structural relaxation, after crystallization and after deformation (cold-rolled). Characteristics of Ti 40Zr 25Ni 8Cu 9Be 18 bulk metallic glass are similar to that observed in other based bulk metallic glasses in the amorphous state: at low temperature, the material is mainly elastic and the mechanical response is independent of driving frequency, while on the other hand, the visco-elastic component becomes very large in the glass transition region. Structural relaxation and crystallization induce a decrease in the visco-elastic component, suggesting that atomic mobility is reduced. In contrast, atomic mobility is increased by a plastic deformation (i.e. cold-rolling). The higher is the cold-rolling ratio, the higher is the visco-elastic component. The experimental results were analyzed in the framework of quasi-point defects theory, which is based on the existence of defects in amorphous materials (polymer, bulk metallic glasses and other non-crystalline solids).
AB - Evolution of atomic mobility in a Ti 40Zr 25Ni 8Cu 9Be 18 bulk metallic glass was studied by dynamic mechanical analysis (DMA) in different states: as-cast, after structural relaxation, after crystallization and after deformation (cold-rolled). Characteristics of Ti 40Zr 25Ni 8Cu 9Be 18 bulk metallic glass are similar to that observed in other based bulk metallic glasses in the amorphous state: at low temperature, the material is mainly elastic and the mechanical response is independent of driving frequency, while on the other hand, the visco-elastic component becomes very large in the glass transition region. Structural relaxation and crystallization induce a decrease in the visco-elastic component, suggesting that atomic mobility is reduced. In contrast, atomic mobility is increased by a plastic deformation (i.e. cold-rolling). The higher is the cold-rolling ratio, the higher is the visco-elastic component. The experimental results were analyzed in the framework of quasi-point defects theory, which is based on the existence of defects in amorphous materials (polymer, bulk metallic glasses and other non-crystalline solids).
KW - B. Glasses, metallic
KW - B. Internal friction
KW - D. Microstructure
KW - E. Mechanical properties, theory
UR - http://www.scopus.com/inward/record.url?scp=84863193563&partnerID=8YFLogxK
U2 - 10.1016/j.intermet.2012.04.004
DO - 10.1016/j.intermet.2012.04.004
M3 - 文章
AN - SCOPUS:84863193563
SN - 0966-9795
VL - 28
SP - 128
EP - 137
JO - Intermetallics
JF - Intermetallics
ER -