Solidification path and microstructure evolution of Mg-3Al-14La alloy: implications for the Mg-rich corner of the Mg-Al-La phase diagram

Charlotte Wong, Kazuhiro Nogita, Mark J. Styles, Suming Zhu, Dong Qiu, Stuart D. McDonald, Mark A. Gibson, Trevor B. Abbott, Mark A. Easton

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

The solidification path and microstructure evolution in Mg-3Al-14La alloy have been investigated by in-situ synchrotron radiography, thermal analysis and characterisation of the final microstructure. It is shown that the solidification sequence begins with the precipitation of primary Al5La2, followed by a eutectic with the products α-Mg+Al5La2, then a mono-variant binary eutectic with the products α-Mg+Mg12La and lastly a ternary eutectic with the products α-Mg+Mg12La +(Al,Mg)3La. This solidification sequence is found to be significantly different to the current Mg-Al-La thermodynamic description. The two main discrepancies are: (i) with Al5La2 being the primary phase, the Mg-3Al-14La alloy is a hyper-eutectic alloy rather than a hypo-eutectic alloy as currently described and (ii) the (Al,Mg)3La phase, which was recently identified as a new phase in the Mg-Al-La system, is also present in the Mg-3Al-14La alloy. The results from this study will be useful for the improvement of the current thermodynamic description of the Mg-Al-La system.

Original languageEnglish
Pages (from-to)527-534
Number of pages8
JournalJournal of Alloys and Compounds
Volume784
DOIs
Publication statusPublished - 5 May 2019

Keywords

  • Metals and alloys
  • Phase diagrams
  • Solidification
  • Synchrotron radiation
  • Transmission electron microscopy (TEM)
  • X-ray diffraction

Cite this

Wong, Charlotte ; Nogita, Kazuhiro ; Styles, Mark J. ; Zhu, Suming ; Qiu, Dong ; McDonald, Stuart D. ; Gibson, Mark A. ; Abbott, Trevor B. ; Easton, Mark A. / Solidification path and microstructure evolution of Mg-3Al-14La alloy : implications for the Mg-rich corner of the Mg-Al-La phase diagram. In: Journal of Alloys and Compounds. 2019 ; Vol. 784. pp. 527-534.
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abstract = "The solidification path and microstructure evolution in Mg-3Al-14La alloy have been investigated by in-situ synchrotron radiography, thermal analysis and characterisation of the final microstructure. It is shown that the solidification sequence begins with the precipitation of primary Al5La2, followed by a eutectic with the products α-Mg+Al5La2, then a mono-variant binary eutectic with the products α-Mg+Mg12La and lastly a ternary eutectic with the products α-Mg+Mg12La +(Al,Mg)3La. This solidification sequence is found to be significantly different to the current Mg-Al-La thermodynamic description. The two main discrepancies are: (i) with Al5La2 being the primary phase, the Mg-3Al-14La alloy is a hyper-eutectic alloy rather than a hypo-eutectic alloy as currently described and (ii) the (Al,Mg)3La phase, which was recently identified as a new phase in the Mg-Al-La system, is also present in the Mg-3Al-14La alloy. The results from this study will be useful for the improvement of the current thermodynamic description of the Mg-Al-La system.",
keywords = "Metals and alloys, Phase diagrams, Solidification, Synchrotron radiation, Transmission electron microscopy (TEM), X-ray diffraction",
author = "Charlotte Wong and Kazuhiro Nogita and Styles, {Mark J.} and Suming Zhu and Dong Qiu and McDonald, {Stuart D.} and Gibson, {Mark A.} and Abbott, {Trevor B.} and Easton, {Mark A.}",
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Solidification path and microstructure evolution of Mg-3Al-14La alloy : implications for the Mg-rich corner of the Mg-Al-La phase diagram. / Wong, Charlotte; Nogita, Kazuhiro; Styles, Mark J.; Zhu, Suming; Qiu, Dong; McDonald, Stuart D.; Gibson, Mark A.; Abbott, Trevor B.; Easton, Mark A.

In: Journal of Alloys and Compounds, Vol. 784, 05.05.2019, p. 527-534.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Solidification path and microstructure evolution of Mg-3Al-14La alloy

T2 - implications for the Mg-rich corner of the Mg-Al-La phase diagram

AU - Wong, Charlotte

AU - Nogita, Kazuhiro

AU - Styles, Mark J.

AU - Zhu, Suming

AU - Qiu, Dong

AU - McDonald, Stuart D.

AU - Gibson, Mark A.

AU - Abbott, Trevor B.

AU - Easton, Mark A.

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N2 - The solidification path and microstructure evolution in Mg-3Al-14La alloy have been investigated by in-situ synchrotron radiography, thermal analysis and characterisation of the final microstructure. It is shown that the solidification sequence begins with the precipitation of primary Al5La2, followed by a eutectic with the products α-Mg+Al5La2, then a mono-variant binary eutectic with the products α-Mg+Mg12La and lastly a ternary eutectic with the products α-Mg+Mg12La +(Al,Mg)3La. This solidification sequence is found to be significantly different to the current Mg-Al-La thermodynamic description. The two main discrepancies are: (i) with Al5La2 being the primary phase, the Mg-3Al-14La alloy is a hyper-eutectic alloy rather than a hypo-eutectic alloy as currently described and (ii) the (Al,Mg)3La phase, which was recently identified as a new phase in the Mg-Al-La system, is also present in the Mg-3Al-14La alloy. The results from this study will be useful for the improvement of the current thermodynamic description of the Mg-Al-La system.

AB - The solidification path and microstructure evolution in Mg-3Al-14La alloy have been investigated by in-situ synchrotron radiography, thermal analysis and characterisation of the final microstructure. It is shown that the solidification sequence begins with the precipitation of primary Al5La2, followed by a eutectic with the products α-Mg+Al5La2, then a mono-variant binary eutectic with the products α-Mg+Mg12La and lastly a ternary eutectic with the products α-Mg+Mg12La +(Al,Mg)3La. This solidification sequence is found to be significantly different to the current Mg-Al-La thermodynamic description. The two main discrepancies are: (i) with Al5La2 being the primary phase, the Mg-3Al-14La alloy is a hyper-eutectic alloy rather than a hypo-eutectic alloy as currently described and (ii) the (Al,Mg)3La phase, which was recently identified as a new phase in the Mg-Al-La system, is also present in the Mg-3Al-14La alloy. The results from this study will be useful for the improvement of the current thermodynamic description of the Mg-Al-La system.

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KW - Phase diagrams

KW - Solidification

KW - Synchrotron radiation

KW - Transmission electron microscopy (TEM)

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