Evolution of shear bands, free volume and hardness during cold rolling of a Zr-based bulk metallic glass

Stolpe, Moritz; Kruzic, Jamie J.; Busch, Ralf

doi:10.1016/j.actamat.2013.10.035

Cited by 131 publications

(54 citation statements)

References 39 publications

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“…1(b) shows the hardness as a function of the distance (d) away from the laser shocked tip. The hardness increases with the increase of d, indicating that the LSP obviously reduced the hardness of the Ti-based BMG, which is consistent with the results of the shot peened 4,5 and the cold rolled [6][7][8][9] metallic glasses. According to the distribution of hardness in Fig.…”

Section: Methodssupporting

confidence: 78%

“…The serrations and pileups are suggested to be induced by the nucleation and propagation of shear bands during deformation. [6][7][8][9][16][17][18][19] Therefore, compared to that in the middle or the matrix region, less serrations and pileups in the softened region may indicate that less shear bands formed during nanoindentation in the softened region.…”

Section: B Deformation Behaviormentioning

confidence: 99%

“…9 Thus, the plastic deformation in the softened region may tend to be localized at those pre-shear bands during nanoindentation, which reduces the deformation resistance and leads to the homogeneous plastic deformation in the softened region. Moreover, the excess free volume per atomic volume in the softened region is estimated to be 0.064%, this excess free volume is expected to be localized within the pre-shear bands and reduce the viscosity of these pre-shear bands, 8,9 resulting in that the pre-shear bands become to be "weak links" in BMGs. 9,[25][26][27] Based on the analysis above, both the existing pre-shear bands and excess free volume could result in the homogeneous plastic deformation in the softened region (Figs.…”

Section: B Deformation Behaviormentioning

confidence: 99%

“…The pre-shear bands and excess free volume caused by cold-rolling scale linearly with the square-root of true plastic strain. 8 It was found that the serrated flow of metallic glasses under nanoindentation was inhibited by cold-rolling. 9 Laser shock peening (LSP), as a mature technology, has been widely used to improve the wear resistance and fatigue property of traditional crystal alloys.…”

Section: Introductionmentioning

confidence: 99%

“…With the aim of increasing plasticity, physical treatments such as shot peening (SP) 4,5 and cold-rolling [6][7][8][9] were performed on BMGs by generating shear bands (called as pre-shear bands) and excess free volume. The SP induced a deformation layer with thickness of tens µm on the surface of BMGs, which obviously improved the compressive plasticity of BMGs.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nanoindentation response of laser shock peened Ti-based bulk metallic glass

Wang

Xue

et al. 2015

AIP Advances

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The effect of laser shock peening (LSP) on mechanical properties of Ti-based bulk metallic glass (BMG) was investigated under nanoindentation. Two regions were generated within the specimen after the LSP: (I) the extremely thick softened region (∼300 µm) in which amounts of shear bands and excess free volume were generated; (II) the middle region where the free volume increased but nearly no shear bands were induced. The hardness decreased with the increase of the indenter depth (h), exhibiting indentation size effect (ISE). The ISE increased with the increase of the measured distance away from the laser shocked tip, indicating that the ISE was inhibited by the shear bands and excess free volume was generated by the LSP.

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Section: Methodssupporting

confidence: 78%

Section: B Deformation Behaviormentioning

confidence: 99%

Section: B Deformation Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanoindentation response of laser shock peened Ti-based bulk metallic glass

Wang

Xue

et al. 2015

AIP Advances

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Bulk Metallic Glasses as Structural Materials: A Review

Kruzic

2016

Adv Eng Mater

234

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Bulk metallic glasses (BMGs) can exhibit excellent combinations of strength and fracture toughness that cannot be achieved by traditional metals, making them attractive for load bearing, mechanical engineering applications. Furthermore, recent research on BMGs has shown that many early perceived shortcomings, such as apparent brittleness or poor fatigue resistance, are not as big of a problem as once thought. The purpose of this paper is to review some of the unique mechanical characteristics of BMGs along with some of the strategies that may be used to improve or exploit their characteristics so that BMGs may be used as structural materials in engineering applications.

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Advanced structural analysis of a laser additive manufactured Zr-based bulk metallic glass along the build height

et al. 2022

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Additive manufacturing of bulk metallic glasses (BMGs) has opened this material class to an exciting new range of potential applications, as bulk-scale, net-shaped amorphous components can be fabricated in a single step. However, there exists a critical need to understand the structural details of additive manufactured BMGs and how the glassy structure is linked to the mechanical properties. Here, we present a study of structure and property variations along the build height for a laser powder bed fusion (LPBF) processed Zr-based BMG with composition Zr59.3Cu28.8Nb1.5Al10.4 commercially termed AMZ4, using hardness testing, calorimetry, positron annihilation spectroscopy, synchrotron X-ray diffraction, and transmission electron microscopy. A lower hardness, more rejuvenated glassy structure was found at the bottom of the build compared to the middle region of the build, with the structure and properties of the top region between the two. Such differences could not be attributed to variability in chemical composition or crystallisation; rather, the softer bottom region was found to have a larger medium range order cluster size, attributed to heat dissipation into the build plate during processing, which gave faster cooling rates and less reheating compared to the steady-state middle of the build. However, at the top of the build less reheating occurs compared to the middle, leading to a somewhat softer and less relaxed state. Graphical abstract

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Evolution of shear bands, free volume and hardness during cold rolling of a Zr-based bulk metallic glass

Cited by 131 publications

References 39 publications

Nanoindentation response of laser shock peened Ti-based bulk metallic glass

Nanoindentation response of laser shock peened Ti-based bulk metallic glass

Bulk Metallic Glasses as Structural Materials: A Review

Advanced structural analysis of a laser additive manufactured Zr-based bulk metallic glass along the build height

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