Temperature-dependence of mode I fracture toughness of a bulk metallic glass

Raut, D. N.; Narayan, Ranjani; Tandaiya, Parag; Ramamurty, Upadrasta

doi:10.1016/j.actamat.2017.10.063

Cited by 40 publications

(34 citation statements)

References 40 publications

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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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Section: Variability Of Fracture Toughnessmentioning

confidence: 99%

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

2019

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“…The BMG was affected by the surface tension like glass, which softened the burr and flowed into the groove, and then exhibited a self-healing ability, thereby improving the surface quality. Moreover, increasing the temperature to reach the Tg during the cutting will caused the structure of the BMG to relax, thereby reducing the fracture toughness and making the BMG easier to cut, finally achieving a better machined surface [2,[38][39][40][41][42], as shown in Figure 10b. Therefore, when the DOC was at 4 µm and the spindle speed was below 2000 rpm, as the spindle speed increased, the surface temperature of the workpiece gradually increased.…”

Section: Surface Qualitymentioning

confidence: 99%

Machinability and Surface Generation of Pd40Ni10Cu30P20 Bulk Metallic Glass in Single-Point Diamond Turning

et al. 2019

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Pd40Ni10Cu30P20 bulk metallic glass (BMG) is widely used in industrial fields due to its excellent oxidation resistance, corrosion resistance, and thermal stability. However, the lack of research on the machinability and cutting performance of BMG using single-point diamond turning (SPDT) limits its application for engineering manufacturing. In the present research, a series of turning experiments were carried out under different cutting parameters, and the machinability reflected by the quality of machined surface, chip morphology, and tool wear were analyzed. Based on the oxidation phenomenon of the machined surface, a molecular dynamics (MD) simulation was conducted to study the mechanism and suppression of the machined surface oxidation during the cutting. The results show that: (1) The Pd-based BMG had good machinability, where the machined surface roughness could go down to 3 nm; (2) irregular micro/nanostructures were found along the tool path on the outer circular region of the machined surface, which greatly affected the surface roughness; and (3) the cutting heat softened the workpiece material and flattened the tool marks under surface tension, which improved the surface quality. This research provides important theoretical and technical support for the application of BMG in optical mold manufacturing.

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“…Generally, cracks experience uniaxial tensile loadings, which lead to mode‐I fracture. [ 7 ] The J ‐integral theory was first developed by Rice and Rosengreen [ 8 ] and was first applied to plastics by Begley and Landes. [ 9 ] They simplified J ‐integral as the energy needed per unit area to acquire a new fracture surface.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear fracture assessment and nanomechanical deformation of elastomeric composites: Development of finite element model and experimental validation

et al. 2021

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In this article, Mode‐I fracture and nanomechanical deformation of elastomeric composites are studied using nonlinear fracture mechanics implicating computer modeling techniques like finite element analysis, and the models developed are verified experimentally. The effect of low notch‐to‐width ratios (NWR) on failure properties like J‐integral, geometry factor, crack tip opening displacement (CTOD), crack advancement, and R‐curves is investigated. The geometry factor is found to be decreasing by 96% when NWR is increased from 0.06 to 0.34. An empirical relationship between CTOD and crack advancement for hybrid elastomeric composites depending on NWR is developed and has been verified analytically. Optimization of silica in 10 phr carbon black filled styrene butadiene rubber is performed, and several characterization techniques are used to justify the outcome. The applicability of mechanical properties like stress contours and factor of safety in fracture characterization of composites is explained briefly. A mesh sensitivity based finite element model has been developed for calibrating the nanoindentation test of elastomeric composites and verified experimentally.

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Temperature-dependence of mode I fracture toughness of a bulk metallic glass

Cited by 40 publications

References 40 publications

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

Machinability and Surface Generation of Pd40Ni10Cu30P20 Bulk Metallic Glass in Single-Point Diamond Turning

Nonlinear fracture assessment and nanomechanical deformation of elastomeric composites: Development of finite element model and experimental validation

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