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Enhance the thermal stability and glass forming ability of Al-based metallic glass by Ca minor-alloying

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Title: Enhance the thermal stability and glass forming ability of Al-based metallic glass by Ca minor-alloying
Authors: Wang, J.Q.1 junqiangwang@wpi-aimr.tohoku.ac.jp, Liu, Y.H.1, Imhoff, S.2, Chen, N.1, Louzguine-Luzgin, D.V.1, Takeuchi, A.1, Chen, M.W.1, Kato, H.3, Perepezko, J.H.1,2 perepezk@engr.wisc.edu, Inoue, A.1,3
Source: Intermetallics. Oct2012, Vol. 29, p35-40. 6p.
Subjects: Metallic glasses, Thermal analysis, Aluminum alloys, Supercooled liquids, Precipitation (Chemistry), Calcium alloys, Glass transition temperature
Abstract: Abstract: In order to stabilize the supercooled liquid and enhance the glass forming ability of Al-based glass forming alloy, the alloying design based on minor Ca substitution for Al was examined to retard the precipitation of face-centered-cubic (FCC) Al. Calcium was selected as the alloying element, because it has a large negative mixing heating with Al but a positive value with the other components. This is anticipated to facilitate formation of Al–Ca clusters and then inhibit the diffusion of Al atoms which is thought to be the dominant reason that limits the glass forming ability (GFA) of Al-based alloys. The proposed strategy was confirmed in experiments by the observation of a greatly increased reduced glass transition temperature, T rg = T g/T l (T g the glass transition temperature and T l the liquidus temperature), the increased the activation energy for crystallization, and the increased activation energy for diffusion. The Al85−x Y8Ni5Co2Ca x (x = 0.5–5) system is found to possess extraordinarily high T rg = 0.613 far exceeding that for any known Al-based glass forming alloys. [Copyright &y& Elsevier]
Copyright of Intermetallics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 77766017
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Enhance the thermal stability and glass forming ability of Al-based metallic glass by Ca minor-alloying
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+J%2EQ%2E%22">Wang, J.Q.</searchLink><relatesTo>1</relatesTo><i> junqiangwang@wpi-aimr.tohoku.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Y%2EH%2E%22">Liu, Y.H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Imhoff%2C+S%2E%22">Imhoff, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+N%2E%22">Chen, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Louzguine-Luzgin%2C+D%2EV%2E%22">Louzguine-Luzgin, D.V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Takeuchi%2C+A%2E%22">Takeuchi, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+M%2EW%2E%22">Chen, M.W.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kato%2C+H%2E%22">Kato, H.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Perepezko%2C+J%2EH%2E%22">Perepezko, J.H.</searchLink><relatesTo>1,2</relatesTo><i> perepezk@engr.wisc.edu</i><br /><searchLink fieldCode="AR" term="%22Inoue%2C+A%2E%22">Inoue, A.</searchLink><relatesTo>1,3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Intermetallics%22">Intermetallics</searchLink>. Oct2012, Vol. 29, p35-40. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Metallic+glasses%22">Metallic glasses</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+analysis%22">Thermal analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+alloys%22">Aluminum alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Supercooled+liquids%22">Supercooled liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+alloys%22">Calcium alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink>
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  Data: Abstract: In order to stabilize the supercooled liquid and enhance the glass forming ability of Al-based glass forming alloy, the alloying design based on minor Ca substitution for Al was examined to retard the precipitation of face-centered-cubic (FCC) Al. Calcium was selected as the alloying element, because it has a large negative mixing heating with Al but a positive value with the other components. This is anticipated to facilitate formation of Al–Ca clusters and then inhibit the diffusion of Al atoms which is thought to be the dominant reason that limits the glass forming ability (GFA) of Al-based alloys. The proposed strategy was confirmed in experiments by the observation of a greatly increased reduced glass transition temperature, T rg = T g/T l (T g the glass transition temperature and T l the liquidus temperature), the increased the activation energy for crystallization, and the increased activation energy for diffusion. The Al85−x Y8Ni5Co2Ca x (x = 0.5–5) system is found to possess extraordinarily high T rg = 0.613 far exceeding that for any known Al-based glass forming alloys. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Intermetallics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.intermet.2012.04.009
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        Text: English
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      – SubjectFull: Thermal analysis
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      – SubjectFull: Aluminum alloys
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      – SubjectFull: Calcium alloys
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      – SubjectFull: Glass transition temperature
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              Text: Oct2012
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