Processing effects on fracture toughness of metallic glasses

Chen, Wen; Zhou, Haofei; Liu, Ze; Ketkaew, Jittisa; Li, Ning; Yurko, James A.; Hutchinson, Nicholas H.; Gao, Huajian; Schroers, Jan

doi:10.1016/j.scriptamat.2016.11.011

Cited by 41 publications

(2 citation statements)

References 46 publications

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“…The results above clearly show that changing annealing temperature induces changes in the glass microstructure of this model system arising from phase separation and that this compositional segregation correlates strongly with embrittlement. Previous experimental evidence has shown that processing effects such as cooling rate and processing environment also influence the fracture behavior of MGs [28]. Therefore, the observed phase separation may not be the only or even the primary cause of embrittlement arising from changing processing condition.…”

Section: Resultsmentioning

confidence: 95%

Critical Analysis of an FeP Empirical Potential Employed to Study the Fracture of Metallic Glasses

Falk

2019

Phys. Rev. Lett.

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An empirical potential that has been widely used to perform molecular dynamics studies on the fracture behavior of FeP metallic glasses is shown to exhibit spinodal decomposition in the composition range commonly studied. The phosphorous segregation induces a transition from ductility to brittleness. During brittle fracture the atomically sharp crack tip propagates along a percolating path with higher P concentration. This embrittlement is observed to occur over a wide range of chemical compositions, and toughness decreases linearly with the degree of compositional segregation over the entire the regime studied. Stable glass forming alloys that can be quenched at low quench rates do not, as a rule, exhibit such thermodynamically unstable behavior near to or above their glass transition temperatures. Hence, the microstructures exhibited in these simulations are unlikely to reflect the actual microstructures or fracture behaviors of the glassy alloys they seek to elucidate.

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Section: Resultsmentioning

confidence: 95%

Critical Analysis of an FeP Empirical Potential Employed to Study the Fracture of Metallic Glasses

Falk

2019

Phys. Rev. Lett.

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“…The material prefers to form multiple shear bands rather than shear band delamination, and a higher fracture resistance can be achieved [42,43,51]. The measured fracture toughness is also sensitive to the temperature [108], loading rate, loading mode [107], heat history [109], residual stress [110], geometry [111] and the distribution of impurities/flaws [112]. For example, the cooling rate directly affects the fracture energy of a Ti-Zr-Cu-Ni-Be MG, which can range from 148.9 to only 0.2 kJ m −2 [26].…”

Section: Variability Of Fracture Toughnessmentioning

confidence: 99%

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

2019

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Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered.

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Developing Processing Parameters and Characterizing Microstructure and Properties of an Additively Manufactured FeCrMoBC Metallic Glass Forming Alloy

et al. 2018

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Powder bed fusion (PBF) processing parameters are developed for a FeCrMoBC glass‐forming alloy. Although bulk metallic glass parts are successfully fabricated using additive manufacturing, the porosity is too high for imparting good mechanical properties. The processing is tuned to create a fully‐dense, dendrite‐reinforced metal‐matrix composite with low hardness and high indentation fracture toughness. Microstructures and properties of the printed alloy are compared to bulk amorphous samples made through thermal spray additive manufacturing (TSAM). The work shows that printing glass‐forming alloys can result in tunable properties based on the cooling rate, porosity, and composite microstructures.

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Processing effects on fracture toughness of metallic glasses

Cited by 41 publications

References 46 publications

Critical Analysis of an FeP Empirical Potential Employed to Study the Fracture of Metallic Glasses

Critical Analysis of an FeP Empirical Potential Employed to Study the Fracture of Metallic Glasses

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

Developing Processing Parameters and Characterizing Microstructure and Properties of an Additively Manufactured FeCrMoBC Metallic Glass Forming Alloy

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