Fatigue behavior and fracture morphology of Zr50Al10Cu40 and Zr50Al10Cu30Ni10 bulk-metallic glasses

Wang, G.Y.; Liaw, Peter K.; Peter, William H.; Yang, Bing; Freels, M.; Yokoyama, Yoshihiko; Benson, Michael L.; Green, B.A.; Saleh, Tarik A.; McDaniels, R.L.; Steward, R.V.; Buchanan, R. A.; Liu, Chang; Brooks, C. R.

doi:10.1016/j.intermet.2004.04.038

Cited by 75 publications

(70 citation statements)

References 39 publications

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“…Similarly, the de-alloyed layer/crack initiation mechanism is also unlikely to be active here as the proportion of elements that would go into the aqueous solution at open circuit (Cu and Ni) is too low to form a voided layer to percolate the solution; moreover, no evidence of such a layer, which should be a micrometer or so wide, was detected by SEM examination of the surface [24]. 4 For active dissolution, an oxide does not protect the metal at the crack tip, often because an aggressive local environment is established there. To prevent blunting of the crack tip by this dissolution, crack growth must be fairly fast, as it is for the amorphous Zr-Ti-Cu-NiBe alloy.…”

Section: V2 Anodic Mechanismmentioning

confidence: 99%

“…One notable monolithic alloy of study has been Vitreloy 1 1 , with a composition (in at.%) of Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 , which has been developed commercially and is used, in its fully amorphous state, in the manufacture of golf clubs. Although the mechanical performance of this alloy has been well documented and is known to show satisfactory fracture toughness and fatigue-crack growth resistance [1][2][3][4][5], its corresponding properties in the presence of a corrosive environment have been far less impressive [6]. Indeed, amorphous Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 has been shown to be highly susceptible to stress-corrosion cracking and stress-corrosion fatigue in the presence of aqueous sodium chloride solution [6].…”

Section: Introductionmentioning

confidence: 99%

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Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Schroeder

Ritchie

2006

Acta Materialia

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Electrochemical and mechanical experiments were conducted to analyze the environmentally-influenced cracking behavior of a bulk amorphous metal, Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 . This study was motivated by a scientific interest in mechanisms of fatigue-crack propagation in an amorphous metal, and by a practical interest in the use of this amorphous metal in applications that take advantage of its unique properties, including high specific strength, large elastic strains and low damping. The objective of the work was to determine the rate and mechanisms of subcritical crack growth in this metallic glass in an aggressive environment. Specifically, fatigue-crack propagation behavior was investigated at a range of stress intensities in air and aqueous salt solutions by examining the effects of loading cycle, stress-intensity range, solution concentration, anion identity, solution de-aeration, and bulk electrochemical potential. Results indicate that crack growth in aqueous solution in this alloy is driven by a stress-assisted anodic reaction at the crack tip. Rate-determining steps for such behavior are reasoned to be electrochemical, stress-dependent reaction at near-threshold levels, and mass transport at higher (steady-state) growth rates.

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Section: V2 Anodic Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Schroeder

Ritchie

2006

Acta Materialia

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“…[3][4][5][6] As well known, metallic glasses are in a thermodynamic metastability and their structures tend to relax, by releasing the excessive free volume. The free volume as a structural feature in metallic glasses affects mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Structural Relaxation on Mechanical Behavior of a Zr-Based Bulk-Metallic Glass

et al. 2007

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Using the instrumented nanoindentation and differential-scanning calorimetry, the effect of the structural relaxation at the elevated temperature on the Zr 52:5 Cu 17:9 Ni 14:6 Al 10:0 Ti 5:0 bulk-metallic glass was investigated. The structural relaxation did not exert a significant influence on the plastic-flow behavior. However, the relaxation enhanced both the hardness and elastic modulus substantially. The decrease in the structural relaxation enthalpy before the glass transition indicates that the relaxation reduced the free volume significantly. The increase in the hardness and elastic modulus is attributed to the reduction in the free volume that resulted from the relaxation.

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“…They have been demonstrated to have super-high strength, large elastic limit, good resistence to corrosion, and great fatigue property. [1][2][3][4][5] A combination of many unique properties makes amorphous alloys excellent candidates as engineering materials with an important application potential. As a result, BMGs have been the subject of numerous studies over the past two decades.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Mechanical Property of Zr-Based Metallic Glasses

Fan

Choo

et al. 2007

Mater. Trans.

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The compression tests were conducted on four Zr-based bulk metallic glasses (BMGs) with different Nb contents. The results show that the addition of few percent Nb did not change the mechanical property. At 77 K, the strength increased notably without embrittlement. Furthermore, it is suggested that the normalized strength changes linearly with the normalized temperature. Current results provided important evidences that BMGs have a great application perspective at cryogenic temperatures. In addition, it is found that at ambient temperature, the BMGs do not exhibit strain rate sensitivity. However, the strength is dependent on the strain rate at high and cryogenic temperatures.

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Fatigue behavior and fracture morphology of Zr50Al10Cu40 and Zr50Al10Cu30Ni10 bulk-metallic glasses

Cited by 75 publications

References 39 publications

Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Effect of Structural Relaxation on Mechanical Behavior of a Zr-Based Bulk-Metallic Glass

Temperature-Dependent Mechanical Property of Zr-Based Metallic Glasses

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