Effects of crystalline particles on mechanical properties of strip-cast Zr-base bulk amorphous alloy

Lee, Jung G.; Lee, Dong‐Geun; Lee, Sunghak; Cho, Kyung-Mox; Park, Ikmin; Kim, Nack J.

doi:10.1016/j.msea.2004.08.065

Cited by 16 publications

(3 citation statements)

References 30 publications

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“…When the amorphous material is mixed with some crystalline structure, the applied load pressure allows the formation of crack and then propagates in the area in between the crystallites. The nanoindentation tip breaks the atomic bonding that is in the amorphous phase, while the crystallites themselves still remained (no change) (Lee et al, 2005). A similar mechanism of crack propagation in composite materials is also explained by other reports (Budiman et al, 2017;Budiman et al, 2018;Triawan et al, 2020).…”

Section: Resultssupporting

confidence: 71%

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Nandiyanto

Triawan²,

Firly³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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This study evaluated the relationship between crystallite size and micromechanical characteristics of micrometersized monoclinic WO3 particles. To avoid the existence of other parameters in the measurement (such as impurities and porous structure in the particle), micrometer WO3 particles were prepared using a direct heat treatment of ultrapure micrometer-sized ammonium tungstate powders. The crystallite size was controlled independently in constant WO3 particle outer diameters to obtain a precise measurement result. The mechanical properties, i.e., hardness and Young’s modulus, were measured by load-controlled nanoindentation test on the singular WO3 particles. The force and displacement relationship data was plotted and analyzed to obtain the relationship between crystallite size and mechanical properties. The results revealed that the micromechanical properties of WO3 particles were strongly dependent on the crystallite size. The hardness and Young’s modulus values increased more than three times when increasing the crystallite size to about 40 nm. The study was completed with a proposed mechanism of crack propagation inside the particle due to static load. The study demonstrates the important role of crystallite size in determining the micromechanical characteristics of WO3 particles. The result is useful especially when utilizing WO3 microparticles for various processes involving extreme conditions, such as high pressure reaction.

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Section: Resultssupporting

confidence: 71%

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Nandiyanto

Triawan²,

Firly³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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“…The main characteristic of the sheet A is the presence of coarse crystalline particles. It has been shown in the previous study that these coarse crystalline particles were not formed during twin-roll strip cooling, but already existed in the melt [25]. Therefore it would be possible to remove these coarse crystalline particles by increasing the melting temperature.…”

Section: Characteristics Of Bulk Amorphous Alloy Sheetsmentioning

confidence: 91%

Continuous fabrication of bulk amorphous alloy sheets by twin-roll strip casting

Lee

et al. 2006

Intermetallics

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“…However, due to the shortcomings of ductility and toughness, brittle fracture occurs readily at room temperature via formation of shear bands under tensile or compressive stress, which seriously limits the application of BMGs. Among the bulk metallic glasses, Zr-based bulk amorphous alloys, with large supercooled liquid region and excellent mechanical properties have been commercially developed as engineering materials [3][4][5]. Zr-Al-Ni-Cu is an attractive alloy system to researchers engaged in the study of glassy alloys due to its supreme glass forming ability with the largest temperature span of the supercooled liquid region [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Analysis of Compressive Zr62Cu17Ni13Al8 Bulk Amorphous Alloy

Liu

Shin

Yoo

et al. 2008

DDF

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Zr62Cu17Ni13Al8 in the supercooled liquid state is expected to be micro-formable at a relatively low stress. We used X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and quantitative high-resolution TEM (HRTEM) to investigate the microstructures of Zr62Cu17Ni13Al8 amorphous alloy after compression test. The alloy exhibited the homogeneous amorphous microstructure with some crystalline phases dispersed in the matrix. According to the XRD results, under the certain strain rate in the supercooled liquid state, the alloy showed higher crystallization at the higher heat treatment temperature. However, at the same heat treatment temperature, the alloy deformed under low strain rate showed higher crystallization. The β crystalline phase particles with spherical shape were detected by SEM and TEM. The sample with higher strain rate and temperature showed longer shear bands. Nano-voids formed by the coalescence of excess free volume in shear bands were investigated by quantitative HRTEM. Compared with the undeformed area, in the shear band, nanovoids were identified in the deformed area through quantitative HRTEM simulation.

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Effects of crystalline particles on mechanical properties of strip-cast Zr-base bulk amorphous alloy

Cited by 16 publications

References 30 publications

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Continuous fabrication of bulk amorphous alloy sheets by twin-roll strip casting

Microstructural Analysis of Compressive Zr<sub>62</sub>Cu<sub>17</sub>Ni<sub>13</sub>Al<sub>8</sub> Bulk Amorphous Alloy

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