Evolution of shear-band cracking in metallic glass under cyclic compression

Wang, Xiao Di; Qu, R.T.; Liu, Zeng Qian; Zhang, Zhe Feng

doi:10.1016/j.msea.2017.04.087

Cited by 21 publications

(9 citation statements)

References 43 publications

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“…For pure MG, the fatigue crack formation mechanism is controlled by shear band 3,35,36 . It is reported that the shear band forms and grows before the fatigue crack formation in pure MG 3 .…”

Section: Resultsmentioning

confidence: 99%

“…3,35,36 It is reported that the shear band forms and grows before the fatigue crack formation in pure MG. 3 The large shear strain is localized into the shear band, and the shear band will transform into fatigue crack once the accumulated strain reaches a critical value. 36 The shear strain can be reflected by the size of shear step caused by the intersection of shear band with specimen surface. The scratch method has been well utilized to measure the size of shear step along the shear band.…”

Section: Fatigue Crack Formation and Growthmentioning

confidence: 99%

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Modulating fatigue property of in situ Ti‐based metallic glass composites by changing dendrite composition

Wang

Song

Zhu

et al. 2022

Fatigue Fract Eng Mat Struct

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Metallic glass composites (MGCs) serve as promising candidates of advanced structural materials. In this work, the Mo element was added to change the dendrite composition of in situ dendrite-reinforced Ti-based MGCs, for exploring the effect of dendrite composition on fatigue behavior. The Mo-containing MGC possessed the lower fatigue lives and fatigue endurance limit, relative to Mo-free MGC. Several characterization methods including X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were utilized to reveal the fatigue deformation and damage features. The Mo could change the dendrite stability and then induce the fatigue deformation variation from martensitic transformation and twinning to dislocation slipping. The fatigue crack formed from the metallic glass (MG) matrix phases and deflected when encountering the dendrites in Mo-free MGC; for comparison, the fatigue crack formed from the dendrites and penetrated the adjacent MG matrix and dendrites in Mo-containing MGC. Current results may offer the guidance on future composition design for MGCs with excellent fatigue property.

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Section: Resultsmentioning

confidence: 99%

Section: Fatigue Crack Formation and Growthmentioning

confidence: 99%

Modulating fatigue property of in situ Ti‐based metallic glass composites by changing dendrite composition

Wang

Song

Zhu

et al. 2022

Fatigue Fract Eng Mat Struct

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“…There are two main views about fatigue crack initiation. Cracks may initiate from the shear bands [2,[20][21][22][23] or casting defects, such as inclusions and pores. It is apparent that, in our low-cost BMG with industrial-grade Zr raw material, fatigue crack initiated from inclusions due to stress concentration.…”

Section: Discussionmentioning

confidence: 99%

Fatigue Behavior of Zr58Cu15.46Ni12.74Al10.34Nb2.76Y0.5 Bulk Metallic Glass Fabricated by Industrial-Grade Zirconium Raw Material

Zhou

Zhang

et al. 2021

Metals

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In this work, the fatigue behavior of a low-cost Zr58Cu15.46Ni12.74Al10.34Nb2.76Y0.5 (at%) bulk metallic glass (BMG) fabricated by industrial-grade Zirconium raw material was investigated under three-point bending loading mode. X-ray, fatigue tests under different stress amplitude and fatigue fractography were conducted in order to characterize the amorphous structure, fatigue stress-life (S-N) curve and fracture mechanism, respectively. It is found that the X-ray diffraction (XRD) result showed a fully amorphous structure due to high glass-forming ability, cracks initiated from inclusions near the rectangular corners at tensile surfaces and the fatigue endurance limit (~168 MPa) and fatigue ratio (~0.13) termed as fatigue endurance limit divided by ultimate tensile strength in stress amplitude were comparable to the similar BMG prepared by high pure raw materials.

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“…Considering the shear propagation mechanism proposed in Section 3.3, the nano-scale heterogeneities of the SB [17,18] should somehow accumulate with each segmental length increment. The regions of low density along the SB evolve to from nanovoids and microcracks, which leads to fracture [9,10,19,48]. This density fluctuation growth should then influence the observed SB step morphology.…”

Section: Shear Offset Fluctuationsmentioning

confidence: 99%

Shear Bands Topology in the Deformed Bulk Metallic Glasses

Seleznev

Vinogradov

2020

Metals

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Recent experimental studies revealed the presence of Volterra dislocation-type long-range elastic strain/stress field around a shear band (SB) terminated in a bulk metallic glass (BMG). The corollary from this finding is that shear bands can interact with these stress fields. In other words, the mutual behaviour of SBs should be affected by their stress fields superimposed with the external stresses. In order to verify this suggestion, the topography of the regions surrounding SBs terminated in the BMGs was carefully analysed. The surfaces of several BMGs, deformed by compression and indentation, were investigated with a high spatial resolution by means of scanning white-light interferometry (SWLI). Along with the evidence for the interaction between SBs, different scenarios of the SB propagation have been observed. Specifically, the SB path deviation, mutual blocking, and deflection of SBs were revealed along with the significant differences between the topologies of the mode II (in-plane) and mode III (out of plane) SBs. While the type II shear manifests a linear propagation path and a monotonically increasing shear offset, the type III shear is associated with a curved, segmented path and a non-monotonically varying shear offset. The systematic application of the “classic” elastic Volterra’s theory of dislocations to the behaviour of SBs in BMGs provides new insight into the widely reported experimental phenomena concerning the SB morphology, which is further detailed in the present work.

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Evolution of shear-band cracking in metallic glass under cyclic compression

Cited by 21 publications

References 43 publications

Modulating fatigue property of in situ Ti‐based metallic glass composites by changing dendrite composition

Modulating fatigue property of in situ Ti‐based metallic glass composites by changing dendrite composition

Fatigue Behavior of Zr58Cu15.46Ni12.74Al10.34Nb2.76Y0.5 Bulk Metallic Glass Fabricated by Industrial-Grade Zirconium Raw Material

Shear Bands Topology in the Deformed Bulk Metallic Glasses

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