Free Volume Change in Amorphous Materials Induced by Deformation
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Deng et al. [1] analyzed plastically deformed Zr55Al10Ni5Cu30 metallic glasses using SAED technique in TEM (see Figure 1678). Although both the structures before and after plastic deformation process were in amorphous state, the diffraction pattern taken from the deformed specimen shows shrinkage (La/Lb = 0.87) and broadening of diffuse halo rings in the diffraction patterns. Those changes of the diffuse rings indicate the increase of interatomic spacing and/or free volume was induced by the deformation process.

SAED patterns of a Zr55Al10Ni5Cu30 metallic glass before (a) and after (b) plastic deformation

Figure 1678. SAED patterns of a Zr55Al10Ni5Cu30 metallic glass before (a) and after (b) plastic deformation process. Adapted from [1]

 

 

 

 

 

[1] Deng Yu-Fu, Yang Fei, Yang Jian-Lin, and Zhang Wei, The increasing of localized free volume in bulk metallic glass under uniaxial compression, Chinese Physics, 16(7), (2007) 2051.

 

 

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