Manipulating internal flow units toward favorable plasticity in Zr-based bulk-metallic glasses by hydrogenation

Dong, Fuyu; Chu, Yuexin; He, Mengyuan; Zhang, Yue; Li, Weidong; Liaw, Peter K.; Wang, Binbin; Luo, Liangshun; Su, Yanqing; Ritchie, Robert O.; Yuan, Xiaoguang

doi:10.1016/j.jmst.2021.04.037

Cited by 23 publications

(8 citation statements)

References 83 publications

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“…As a consequence, the decreasing tendency of the creep resistance is largely attributed to the diminution of the STZ volume as well as the greater ratio of plastic flow under the higher maximum load. Furthermore, the values of STZ volume in the current work are around 2 nm 3 , which are smaller than the Zr-based MGs manufactured by other methods [36,71,72]. The smaller volume of STZ is responsible for the smaller creep stress exponent and the corresponding creep resistance in the AM-ed MG.…”

mentioning

confidence: 59%

“…Furthermore, a series of displacement bursts, termed as ''pop-in" events or serration, can be observed in the loading stage of the curves. These serrations are associated with the initiation and expansion of the shear bands underneath the indenter tip and have been observed in other types of MGs [36][37][38]. The hardness and reduced modulus, the two most common nanomechanical properties acquired by nanoindentation, are calculated by the recognized Oliver and Pharr (O-P) methods [39,40] and presented in Fig.…”

Section: Representative P-h Curvesmentioning

confidence: 70%

“…The values of n are in the range of 2-3, which means the flow in the MG is non-Newtonian [54]. Furthermore, when compared to other Zr-based MG generated by traditional techniques in the literature [25,27,36,60], the n values in our study are relatively small, sug- gesting that the AM process leads to different defect densities that impact the creep resistance. It can be found that the creep stress exponent of the AM-ed MG also exhibits apparent size dependence, that is, the n values decrease with the raising of the applied maximum load, which suggests the creep resistance decrease.…”

mentioning

confidence: 65%

“…There are two separate retardation peaks for all of the relaxation spectra, which demonstrates that two different relaxation states exist in the nanoindentation creep process of the MG. Previous studies have proposed that the width and intensity of the peaks are relevant to the size and state of the defects in MG, and each peak represents the distinct material-transport mechanisms or different flow defects [36,53].…”

Section: Nanoscale Creep Deformationmentioning

confidence: 99%

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Nanoscale Creep Behavior and its Size Dependency of a Zr-Based Bulk Metallic Glass Manufactured by Selective Laser Melting

Liu¹,

Chang

Fu³

et al. 2022

SSRN Journal

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mentioning

confidence: 59%

Section: Representative P-h Curvesmentioning

confidence: 70%

mentioning

confidence: 65%

Section: Nanoscale Creep Deformationmentioning

confidence: 99%

See 2 more Smart Citations

Nanoscale Creep Behavior and its Size Dependency of a Zr-Based Bulk Metallic Glass Manufactured by Selective Laser Melting

Liu¹,

Chang

Fu³

et al. 2022

SSRN Journal

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“…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.…”

mentioning

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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High‐Entropy Alloy‐Induced Metallic Glass Transformation: Challenges Posed by in situ Alloying via Additive Manufacturing

et al. 2022

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In situ alloying and fabricating glassy structures through a layer‐by‐layer fashion approach are challenging but have high potential to develop novel‐graded materials. For the first time, this cost‐effective approach is applied to additive manufacturing (AM) of a Zr‐based bulk metallic glass (BMG) from high‐entropy alloys (HEAs). A newly developed composition of Zr40Al20Cu20Ti20 is fabricated through laser powder bed fusion (LPBF). Process parameters are optimized within a wide range of laser power (50–200 W) as well as scanning speed (50–800 mm s−1). In all printed samples, microscopic and compositional examinations reveal no glass formation, but very fine grains and CuTi and AlTi nanocrystals. Some glassy transitions at the interfaces may be encouraged to occur with proper melting and mixing. However, the main reason for not obtaining a glassy matrix is the substantial proportion of unmelted Zr raw powder throughout the structure as spherical particles. Consequently, glass formation can be hindered by a considerable amount of compositional deviation. During LPBF, in situ alloying poses significant challenges to developing BMGs. Hence, the various stages of the process, including raw material specifications, laser settings, and process parameters, should be investigated further.

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Manipulating internal flow units toward favorable plasticity in Zr-based bulk-metallic glasses by hydrogenation

Cited by 23 publications

References 83 publications

Nanoscale Creep Behavior and its Size Dependency of a Zr-Based Bulk Metallic Glass Manufactured by Selective Laser Melting

Nanoscale Creep Behavior and its Size Dependency of a Zr-Based Bulk Metallic Glass Manufactured by Selective Laser Melting

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

High‐Entropy Alloy‐Induced Metallic Glass Transformation: Challenges Posed by in situ Alloying via Additive Manufacturing

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