Importance of chamber gas pressure on processing of Al-based metallic glasses during melt spinning |
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| Authors: | H.W. Yang R.C. Wang X.G. Yuan R.D. Li J.Q. Wang M.J. Tan |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University , Singapore 639798, Singapore;2. School of Materials Science and Engineering, Shenyang University of Technology , Shenyang 110870, China hwyang2000@hotmail.com;4. School of Materials Science and Engineering, Shenyang University of Technology , Shenyang 110870, China;5. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , Shenyang 110016, China;6. School of Mechanical and Aerospace Engineering, Nanyang Technological University , Singapore 639798, Singapore |
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| Abstract: | The effect of chamber gas pressure on the amorphicity of Al85Ni5Y10 alloy was studied for the melt-spinning process. The amorphicity of as-quenched ribbons was characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The chamber atmosphere pressure is crucial to the cooling rate of melt spinning. At high vacuum, at pressure less than 0.001?atm, fully crystalline fragments are obtained. Monolithic amorphous ribbons were only obtained at a gas pressure of 0.1?atm, 0.2?atm or higher. The extended contact length between ribbons and the copper wheel contributes to the high cooling rate of melt spinning in Al-based glass forming alloys; that is supported by images recorded by a high-speed camera. Higher chamber pressure increases contact length between ribbons and the wheel, which is qualitatively elucidated by Bernoulli's equation. |
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| Keywords: | amorphicity melt spinning amorphous alloy Bernoulli's equation quenching rate |
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