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Effects of annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass
Highlights ► The free volume decreases and nanocrystals nucleate during annealing. ► Decrease of the free volume decreases the nucleation ratio of the shear bands. ► The nucleation of nanocrystals inhibits the propagation of the shear bands. ► Hardness and modulus depends on the evolution of free volume and nanocrystals.
Abstract In this paper, the effects of isothermal annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass (BMG) were investigated. It has been shown that the Vickers hardness increases from ∼481Hv (as-cast state) to ∼518Hv after annealed for 20min. Nanoindentation tests also showed that the hardness and elastic modulus increase from ∼6.45GPa and ∼113.0GPa (as-cast state) to ∼7.27GPa and ∼130.9GPa after annealed for 20min, respectively. The results indicated that the free volume of the BMG decreased and nanocrystals nucleated during annealing. The annihilation of the free volume decreased the nucleation ratio/sites of the shear bands, while the nucleation of nanocrystals inhibited the propagation of the shear bands. Both effects are responsible for the enhancement of the hardness and elastic modulus of the BMG.
Effects of annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass
Highlights ► The free volume decreases and nanocrystals nucleate during annealing. ► Decrease of the free volume decreases the nucleation ratio of the shear bands. ► The nucleation of nanocrystals inhibits the propagation of the shear bands. ► Hardness and modulus depends on the evolution of free volume and nanocrystals.
Abstract In this paper, the effects of isothermal annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass (BMG) were investigated. It has been shown that the Vickers hardness increases from ∼481Hv (as-cast state) to ∼518Hv after annealed for 20min. Nanoindentation tests also showed that the hardness and elastic modulus increase from ∼6.45GPa and ∼113.0GPa (as-cast state) to ∼7.27GPa and ∼130.9GPa after annealed for 20min, respectively. The results indicated that the free volume of the BMG decreased and nanocrystals nucleated during annealing. The annihilation of the free volume decreased the nucleation ratio/sites of the shear bands, while the nucleation of nanocrystals inhibited the propagation of the shear bands. Both effects are responsible for the enhancement of the hardness and elastic modulus of the BMG.
Effects of annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass
Gu, Ji (author) / Song, Min (author) / Ni, Song (author) / Guo, Shengfeng (author) / He, Yuehui (author)
2012-12-27
5 pages
Article (Journal)
Electronic Resource
English
Effects of annealing on the hardness and elastic modulus of a Cu36Zr48Al8Ag8 bulk metallic glass
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