Effect of deep cryogenic cycling treatment on shear transformation zone volume and size of Zr-based metallic glass

Zhu, Qianyong; Zhang, Min; Jin, Xi; Yang, Huijun; Jia, Lan; Qiao, J.W.

doi:10.1557/s43578-021-00264-9

Cited by 7 publications

(5 citation statements)

References 39 publications

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“…According to the formula Δ T = T x − T g , Δ T is ≈131 °C, S = (T p − T x ) × (T x − T g )/T g , and S is ≈4.82. Chen et al., [ 28 ] Zhu et al., [ 29 ] Andreoli et al., [ 30 ] and Wu et al. [ 31 ] determined the Δ T of the Zr 55 Cu 30 Ni 5 Al 10 , Zr 55 Al 10 Cu 29 Ni 5 Y 1 , Zr 52.5 Ti 5 Cu 17.9 Ni 14.6 Al 10 , and Zr 64 Cu 18 Ni 10 Al 8 to be 77, 177, 66, and 127 °C, respectively.…”

Section: Results and Analysismentioning

confidence: 99%

Influence of Laser Pulse Welding Power on Welding Joints of Zr‐Based Amorphous Alloys

Liu

Guo

et al. 2022

Cryst. Res. Technol.

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A Zr-based amorphous alloy (thickness = 2 mm) is welded by laser welding. The phase composition and microstructure of the welding joints under different laser powers are analyzed by optical microscopy, X-ray diffraction, and scanning electron microscopy. Mechanical properties of the welded joints under different laser powers are examined using microhardness and tensile testers. The glass forming ability and thermal stability of the welded joints are investigated using differential scanning calorimetry. With an increase in laser power, the degree of crystallization of welded joints increases, their microhardness is in the range 502.3-546.9 HV 0.2 , and tensile strength is up to 583 MPa (75% of that of the Zr-based amorphous alloy). Through the research of the article, it can be found that when the laser power increases, the crystallization degree of the welded joint first increases rapidly and then tends to be stable. The lower laser power should be used as far as possible in the case of penetration.

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Section: Results and Analysismentioning

confidence: 99%

Influence of Laser Pulse Welding Power on Welding Joints of Zr‐Based Amorphous Alloys

Liu

Guo

et al. 2022

Cryst. Res. Technol.

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“…Pan et al found that the STZ volume increases with increasing Poisson’s ratio, leading to the improved plasticity of BMGs [ 48 ], while Qiao et al believed that this rule is no longer applicable [ 49 ]. Herein, we collected the reported STZ volumes and Poisson’s ratios of BMGs, which are shown in Figure 6 a.…”

Section: Discussionmentioning

confidence: 99%

“…Table S1: The STZ volumes and Poisson’s ratios of reported BMGs. References [ 41 , 42 , 45 , 46 , 47 , 49 , 53 , 54 , 55 , 56 , 57 , 59 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ] are cited in the supplementary materials.…”

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confidence: 99%

Applicability of Pre-Plastic Deformation Method for Improving Mechanical Properties of Bulk Metallic Glasses

et al. 2022

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Pre-plastic deformation (PPD) treatments on bulk metallic glasses (BMGs) have previously been shown to be helpful in producing multiple shear bands. In this work, the applicability of the PPD approach on BMGs with different Poisson’s ratios was validated based on experimental and simulation observations. It was found that for BMGs with high Poisson’s ratios (HBMGs, e.g., Zr56Co28Al16 and Zr46Cu46Al8), the PPD treatment can easily trigger a pair of large plastic deformation zones consisting of multiple shear bands. These PPD-treated HBMGs clearly display improved strength and compressive plasticity. On the other hand, the mechanical properties of BMGs with low Poisson’s ratios (LBMG, e.g., Fe48Cr15Mo14Y2C15B6) become worse due to a few shear bands and micro-cracks in extremely small plastic deformation zones. Additionally, for the PPD-treated HBMGs with similar high Poisson’s ratios, the Zr56Co28Al16 BMG exhibits much larger plasticity than the Zr46Cu46Al8 BMG. This phenomenon is mainly due to more defective icosahedral clusters in the Zr56Co28Al16 BMG, which can serve as nucleation sites for shear transformation zones (STZs) during subsequent deformation. The present study may provide a basis for understanding the plastic deformation mechanism of BMGs.

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“…Less-dense structures upon CTC treatments have been reported in molecular dynamics simulations of CuZr MGs at different species contents [18] and in the calculation of Zr 55 Cu 30 Al 10 Ni 5 BMGs [24]. The increased defect density [22] and larger volumes of STZs [20,22,26] have been revealed via representative nanoindentation experiments on CTC-treated ZrCu-based BMGs. All these efforts reveal that CTC treatments contribute to structural rejuvenation through activating more defects of larger sizes to a less-dense structure for ZrCu-based BMGs.…”

Section: Introductionmentioning

confidence: 87%

Slip Statistics for a Bulk Metallic Glass Treated by Cryogenic Thermal Cycling Reflect Its Optimized Plasticity

Li,

Liu,

Zhao

et al. 2024

Metals

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Enhanced plasticity is obtained in a structurally rejuvenated Zr-based bulk metallic glass (BMG) that has been treated via cryogenic thermal cycling (CTC) for one hundred cycles. More than one primary shear band is activated due to the structural rejuvenation, which can inhibit the jerky and system-spanning propagation of shear bands to generate sluggish shear-dynamics. These are mapped to the slip statistics, including the decreased critical avalanche size, the much longer avalanche duration of large (system-spanning) slips, and a great number of small avalanches. Moreover, the universal scaling of slip avalanches for three applied stress ranges is addressed to predict the applied stress at which the failure avalanche appears most. These results indicate that slip statistics can be the fingerprints to show how much the BMG is rejuvenated, and the failure avalanche provides a good opportunity to intervene in the failure of BMGs in advance.

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Effect of deep cryogenic cycling treatment on shear transformation zone volume and size of Zr-based metallic glass

Cited by 7 publications

References 39 publications

Influence of Laser Pulse Welding Power on Welding Joints of Zr‐Based Amorphous Alloys

Influence of Laser Pulse Welding Power on Welding Joints of Zr‐Based Amorphous Alloys

Applicability of Pre-Plastic Deformation Method for Improving Mechanical Properties of Bulk Metallic Glasses

Slip Statistics for a Bulk Metallic Glass Treated by Cryogenic Thermal Cycling Reflect Its Optimized Plasticity

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