The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG

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Asadi Khanouki M.T.; TAVAKOLI R.; AASHURI H.

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Journal: ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL) Year:2019 | Volume:38 | Issue:2 Page(s): 11-24

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Title

The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG

Author(s)

Asadi Khanouki M.T. | TAVAKOLI R. | AASHURI H. | Issue Writer Certificate

Keywords

Bulk metallic glassQ1

Shear bandQ1

Shear transformation zoneQ1

Fracture surface morphologyQ1

DuctilityQ2

Abstract

In this research, the effect of temperature on the mean size of fracture surface features, as well as the relation between fracture surface morphologies and Ductility of a La-based BMG as a relatively brittle alloy, was systematically investigated. After producing the alloy, three-point bending experiments, over a wide range of temperatures, were conducted on the samples; then the fracture surfaces were analyzed using scanning electron microscopy. The results demonstrated that the width of stable crack growth region (Δ W) was increased upon Ductility (δ p). Conversely, the mean size of the features on both stable (Ds) and fast (Df) crack growth regions and also, shear offset width (Δ L) were found to decrease with increasing Ductility. In this case, the Shear band instability was reduced, and the plastic strain could be more homogeneously distributed on the Shear bands. The similarity of Δ L and Ds values suggested that the formation of vein pattern was caused by steak-slip behavior and multiple-step sliding inside the Shear band through the fluid meniscus instability mechanism. Furthermore, the results obtained from correlation between Ductility and fracture surface morphologies in the BMG indicated that the size of features was reduced with increasing Ductility.

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APA: Copy

Asadi Khanouki, M.T., TAVAKOLI, R., & AASHURI, H.. (2019). The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), 38(2 ), 11-24. SID. https://sid.ir/paper/163195/en

Vancouver: Copy

Asadi Khanouki M.T., TAVAKOLI R., AASHURI H.. The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL)[Internet]. 2019;38(2 ):11-24. Available from: https://sid.ir/paper/163195/en

IEEE: Copy

M.T. Asadi Khanouki, R. TAVAKOLI, and H. AASHURI, “The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG,” ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), vol. 38, no. 2 , pp. 11–24, 2019, [Online]. Available: https://sid.ir/paper/163195/en

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