Novel Crystallization Behaviors of Zr-Based Metallic Glass Under Thermo-Mechanical Coupled Fatigue Loading Condition

doi:10.1007/s40195-019-00882-7

Abstract

Abstract:

Novel crystallization behaviors of Zr₅₅Cu₃₀Al₁₀Ni₅ bulk metallic glass are investigated. On the one hand, mixed oxides, including CuO, CuAlO₂, CuAl₂O₄ and ZrO₂, show sequential oxidation process determined by coupling effects of specific cyclic load and temperature. On the other hand, at a temperature (100°C) by far lower than T_g of 412°C, under cyclic loading condition, non-oxidized binary alloy CuZr₂ is precipitated; the thermo-mechanical coupled effects of temperature below T_g and fatigue accumulation on the non-oxidized crystallization behaviors are revealed. Meanwhile, at a constant temperature of 400°C, by comparing among the XRD patterns, respectively, obtained from tensile, creep and fatigue fractures, the dominating effect of cyclic load on the generation of non-oxidized CuZr₂ is verified. Furthermore, the crystallization behavior of amorphous phases under cyclic loading condition is observed through TEM micrograph and diffraction pattern at 100°C.

Key words: Bulk metallic glass, Fatigue, Thermo-mechanical coupling, Crystallization

Zhi-Chao Ma, Xiao-Xi Ma, Hong-Wei Zhao, Fu Zhang, Li-Ming Zhou, Lu-Quan Ren. Novel Crystallization Behaviors of Zr-Based Metallic Glass Under Thermo-Mechanical Coupled Fatigue Loading Condition[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 797-802.

Figures/Tables 5

Fig.1 Thermo-mechanical fatigue testing system integrated with a double-V notched Zr55Cu30Al10Ni5 BMG specimen and corresponding DSC curve

Fig. 2 XRD pattern analysis of Zr55Cu30Al10Ni5 BMG specimens’ fatigue surfaces

Fig. 3 Fatigue fracture morphologies, respectively, obtained from a RT fatigue test, b-d thermo-mechanical coupled fatigue tests as an increase in temperature ranging from 200 to 400°C

Fig. 4 XRD pattern analysis of Zr55Cu30Al10Ni5 BMG specimens’ fracture surfaces, respectively, obtained from static tensile, creep and fatigue fractures

Fig.5 TEM micrographs and diffraction patterns of Zr55Cu30Al10Ni5 specimens after a RT fatigue, b 100°C fatigue tests to illustrate the crystallization of amorphous phases

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