Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys

Mark A. Easton; Suming Zhu; Mark A. Gibson; Jian-Feng Nie; Joachim Gröbner; Artem Kozlov; Rainer Schmid-Fetzer

doi:10.1002/9781118062029.ch32

Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys

Mark A. Easton, Suming Zhu, Mark A. Gibson, Jian-Feng Nie, Joachim Gröbner, Artem Kozlov, Rainer Schmid-Fetzer

Materials Science & Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Other › peer-review

Abstract

The phase relationships in the Mg-rich corner of the Mg-Ce-Nd system have been investigated through the evaluation of selected compositions in the as-cast and heat-treated condition. Consistent thermodynamic CALPHAD-type assessments have also been generated for the Mg-Ce-Nd system [1]. It is shown that this system reveals a significant degree of meta-stability under technologically relevant solidification conditions (i.e., permanent-mould or high pressure die casting). This is simulated in thermodynamic calculations by suppression of the RE₅Mg₄₁ phase and reasonable agreement is found with the as-cast microstructures. After heat treatment these microstructures transform, depending on alloy composition, into phase assemblies consistent with the calculated stable equilibrium phase diagram. It is the elucidation of such meta-stable phase formation and the subsequent transformation from the as-cast to the heat treated state that is a particular strength of the thermodynamic approach and which makes it a powerful tool for alloy development.

Original language	English
Title of host publication	Magnesium Technology 2011
Subtitle of host publication	Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011
Editors	Wim H. Silleken, Sean R Agnew, Neale R. Neelameggham, Suveen N. Mathaudhu
Place of Publication	Hoboken NJ USA
Publisher	John Wiley & Sons
Pages	167
Number of pages	1
ISBN (Print)	9781118029367
DOIs	https://doi.org/10.1002/9781118062029.ch32
Publication status	Published - 26 Apr 2011
Event	Magnesium Technology Symposium 2011 - San Diego, United States of America Duration: 27 Feb 2011 → 3 Mar 2011 https://onlinelibrary.wiley.com/doi/book/10.1002/9781118062029 (Proceedings)

Conference

Conference	Magnesium Technology Symposium 2011
Country	United States of America
City	San Diego
Period	27/02/11 → 3/03/11
Internet address	https://onlinelibrary.wiley.com/doi/book/10.1002/9781118062029 (Proceedings)

Keywords

CALPHAD
Casting
Isothermal heat treatments
Rare earth

Access to Document

10.1002/9781118062029.ch32Licence: Unspecified

Link to publication in Scopus

Cite this

Easton, M. A., Zhu, S., Gibson, M. A., Nie, J-F., Gröbner, J., Kozlov, A., & Schmid-Fetzer, R. (2011). Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys. In W. H. Silleken, S. R. Agnew, N. R. Neelameggham, & S. N. Mathaudhu (Eds.), Magnesium Technology 2011: Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011 (pp. 167). John Wiley & Sons. https://doi.org/10.1002/9781118062029.ch32

Easton, Mark A. ; Zhu, Suming ; Gibson, Mark A. ; Nie, Jian-Feng ; Gröbner, Joachim ; Kozlov, Artem ; Schmid-Fetzer, Rainer. / Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys. Magnesium Technology 2011: Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011. editor / Wim H. Silleken ; Sean R Agnew ; Neale R. Neelameggham ; Suveen N. Mathaudhu. Hoboken NJ USA : John Wiley & Sons, 2011. pp. 167

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abstract = "The phase relationships in the Mg-rich corner of the Mg-Ce-Nd system have been investigated through the evaluation of selected compositions in the as-cast and heat-treated condition. Consistent thermodynamic CALPHAD-type assessments have also been generated for the Mg-Ce-Nd system [1]. It is shown that this system reveals a significant degree of meta-stability under technologically relevant solidification conditions (i.e., permanent-mould or high pressure die casting). This is simulated in thermodynamic calculations by suppression of the RE5Mg41 phase and reasonable agreement is found with the as-cast microstructures. After heat treatment these microstructures transform, depending on alloy composition, into phase assemblies consistent with the calculated stable equilibrium phase diagram. It is the elucidation of such meta-stable phase formation and the subsequent transformation from the as-cast to the heat treated state that is a particular strength of the thermodynamic approach and which makes it a powerful tool for alloy development.",

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Easton, MA, Zhu, S, Gibson, MA, Nie, J-F, Gröbner, J, Kozlov, A & Schmid-Fetzer, R 2011, Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys. in WH Silleken, SR Agnew, NR Neelameggham & SN Mathaudhu (eds), Magnesium Technology 2011: Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011. John Wiley & Sons, Hoboken NJ USA, pp. 167, Magnesium Technology Symposium 2011, San Diego, United States of America, 27/02/11. https://doi.org/10.1002/9781118062029.ch32

Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys. / Easton, Mark A.; Zhu, Suming; Gibson, Mark A.; Nie, Jian-Feng; Gröbner, Joachim; Kozlov, Artem; Schmid-Fetzer, Rainer.

Magnesium Technology 2011: Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011. ed. / Wim H. Silleken; Sean R Agnew; Neale R. Neelameggham; Suveen N. Mathaudhu. Hoboken NJ USA : John Wiley & Sons, 2011. p. 167.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Other › peer-review

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N2 - The phase relationships in the Mg-rich corner of the Mg-Ce-Nd system have been investigated through the evaluation of selected compositions in the as-cast and heat-treated condition. Consistent thermodynamic CALPHAD-type assessments have also been generated for the Mg-Ce-Nd system [1]. It is shown that this system reveals a significant degree of meta-stability under technologically relevant solidification conditions (i.e., permanent-mould or high pressure die casting). This is simulated in thermodynamic calculations by suppression of the RE5Mg41 phase and reasonable agreement is found with the as-cast microstructures. After heat treatment these microstructures transform, depending on alloy composition, into phase assemblies consistent with the calculated stable equilibrium phase diagram. It is the elucidation of such meta-stable phase formation and the subsequent transformation from the as-cast to the heat treated state that is a particular strength of the thermodynamic approach and which makes it a powerful tool for alloy development.

AB - The phase relationships in the Mg-rich corner of the Mg-Ce-Nd system have been investigated through the evaluation of selected compositions in the as-cast and heat-treated condition. Consistent thermodynamic CALPHAD-type assessments have also been generated for the Mg-Ce-Nd system [1]. It is shown that this system reveals a significant degree of meta-stability under technologically relevant solidification conditions (i.e., permanent-mould or high pressure die casting). This is simulated in thermodynamic calculations by suppression of the RE5Mg41 phase and reasonable agreement is found with the as-cast microstructures. After heat treatment these microstructures transform, depending on alloy composition, into phase assemblies consistent with the calculated stable equilibrium phase diagram. It is the elucidation of such meta-stable phase formation and the subsequent transformation from the as-cast to the heat treated state that is a particular strength of the thermodynamic approach and which makes it a powerful tool for alloy development.

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Easton MA, Zhu S, Gibson MA, Nie J-F, Gröbner J, Kozlov A et al. Thermodynamic analysis of as-cast and heat treated microstructures of Mg-Ce-Nd alloys. In Silleken WH, Agnew SR, Neelameggham NR, Mathaudhu SN, editors, Magnesium Technology 2011: Held during TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011. Hoboken NJ USA: John Wiley & Sons. 2011. p. 167 https://doi.org/10.1002/9781118062029.ch32