Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass.

Yu-Hang Yang,Bo Huang,Na Yang,Wen Liang,Gang Wang,Xi-Lei Bian,Hao-Ran Huang,Yan-Dong Jia,Jun Yi

doi:10.3390/ma14112815

Yu-Hang Yang, Bo Huang + Show 7 more

Open Access

https://doi.org/10.3390/ma14112815

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Abstract

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

Highlights

Bulk metallic glasses (BMGs) have exceptional strength [1]
Co43Fe20Ta5.5B31.5 BMG has the highest strength among bulk metals [2]
The combination of the strength and fracture toughness of these two BMGs lie outside the benchmarks established by the strongest and toughest metals [5,6]

Summary

Introduction

Bulk metallic glasses (BMGs) have exceptional strength [1]. Co43Fe20Ta5.5B31.5 BMG has the highest strength among bulk metals [2]. The strength of Zr-based BMGs is comparable to that of high-strength steels [3,4]. Zr61Ti2Cu25Al12 [5] and Pd79Ag3.5P6Si9.5Ge2 [6] BMGs have high fracture toughness, which is comparable to that of low carbon steels. The combination of the strength and fracture toughness of these two BMGs lie outside the benchmarks established by the strongest and toughest metals [5,6]. BMGs are competitive structural material candidates for engineering applications due to their high strength, fracture toughness, and exceptional plasticity. Fatigue resistance of materials can be vital for engineering structures that are subjected to cyclic loading

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Conclusion