Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys

Rainer Schmid-Fetzer; Jian Feng Nie; Xiaojun Zhao; Houwen Chen

doi:10.1007/978-3-030-36647-6_13

Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys

Rainer Schmid-Fetzer, Jian Feng Nie, Xiaojun Zhao, Houwen Chen

Materials Science & Engineering

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

Abstract

The intermetallic phase (designated δ phase) in the solution-treated microstructure of commercial magnesium alloy QE22 (Mg–2.5Ag–2.0Nd–0.7Zr, wt%) has been investigated using scanning electron microscopy, electron diffraction, atomic-resolution scanning transmission electron microscopy (STEM), and thermodynamic modeling. In contrast to the previous reports, an orthorhombic structure (space group Cmcm) and a composition of NdAgMg₁₁ are determined. The present experimental data are used to construct a thermodynamic description of the Mg–Ag–Nd system which is embedded in a multicomponent Mg alloy database. Implications on the formation of temperature range and thermal stability of this phase and alloy solidification are discussed based on the calculated Mg–Nd–Ag phase diagram and Scheil solidification paths of alloys. The impact of Ag-replacement in such QE alloys by Zn-addition in the Mg–Ag–Nd–Zn (QEZ) alloy system is elaborated using appropriate thermodynamic simulations to reveal the competition with other intermetallics. These data are suggested to contribute to ICME of magnesium alloys.

Original language	English
Title of host publication	Magnesium Technology 2020
Editors	J. Brian Jordon, Victoria Miller, Vineet V. Joshi, Neale R. Neelameggham
Publisher	Springer-Praxis
Pages	71-78
Number of pages	8
ISBN (Print)	9783030366469
DOIs	https://doi.org/10.1007/978-3-030-36647-6_13
Publication status	Published - 3 Apr 2020
Event	Magnesium Technology Symposium 2020 - San Diego, United States of America Duration: 23 Feb 2020 → 27 Feb 2020 https://www.tms.org/TMS2020

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	Magnesium Technology Symposium 2020
Abbreviated title	TMS 2020
Country	United States of America
City	San Diego
Period	23/02/20 → 27/02/20
Internet address	https://www.tms.org/TMS2020

Keywords

Crystal structure
ICME
Secondary phases
Thermodynamics

Access to Document

10.1007/978-3-030-36647-6_13

Link to publication in Scopus

Cite this

Schmid-Fetzer, R., Nie, J. F., Zhao, X., & Chen, H. (2020). Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys. In J. B. Jordon, V. Miller, V. V. Joshi, & N. R. Neelameggham (Eds.), Magnesium Technology 2020 (pp. 71-78). (Minerals, Metals and Materials Series). Springer-Praxis. https://doi.org/10.1007/978-3-030-36647-6_13

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title = "Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys",

abstract = "The intermetallic phase (designated δ phase) in the solution-treated microstructure of commercial magnesium alloy QE22 (Mg–2.5Ag–2.0Nd–0.7Zr, wt%) has been investigated using scanning electron microscopy, electron diffraction, atomic-resolution scanning transmission electron microscopy (STEM), and thermodynamic modeling. In contrast to the previous reports, an orthorhombic structure (space group Cmcm) and a composition of NdAgMg11 are determined. The present experimental data are used to construct a thermodynamic description of the Mg–Ag–Nd system which is embedded in a multicomponent Mg alloy database. Implications on the formation of temperature range and thermal stability of this phase and alloy solidification are discussed based on the calculated Mg–Nd–Ag phase diagram and Scheil solidification paths of alloys. The impact of Ag-replacement in such QE alloys by Zn-addition in the Mg–Ag–Nd–Zn (QEZ) alloy system is elaborated using appropriate thermodynamic simulations to reveal the competition with other intermetallics. These data are suggested to contribute to ICME of magnesium alloys.",

keywords = "Crystal structure, ICME, Secondary phases, Thermodynamics",

author = "Rainer Schmid-Fetzer and Nie, {Jian Feng} and Xiaojun Zhao and Houwen Chen",

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Schmid-Fetzer, R, Nie, JF, Zhao, X & Chen, H 2020, Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys. in JB Jordon, V Miller, VV Joshi & NR Neelameggham (eds), Magnesium Technology 2020. Minerals, Metals and Materials Series, Springer-Praxis, pp. 71-78, Magnesium Technology Symposium 2020, San Diego, United States of America, 23/02/20. https://doi.org/10.1007/978-3-030-36647-6_13

Intermetallic phase formation in Mg–Ag–Nd (QE) and Mg–Ag–Nd–Zn (QEZ) alloys. / Schmid-Fetzer, Rainer; Nie, Jian Feng; Zhao, Xiaojun; Chen, Houwen.

Magnesium Technology 2020. ed. / J. Brian Jordon; Victoria Miller; Vineet V. Joshi; Neale R. Neelameggham. Springer-Praxis, 2020. p. 71-78 (Minerals, Metals and Materials Series).

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

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N2 - The intermetallic phase (designated δ phase) in the solution-treated microstructure of commercial magnesium alloy QE22 (Mg–2.5Ag–2.0Nd–0.7Zr, wt%) has been investigated using scanning electron microscopy, electron diffraction, atomic-resolution scanning transmission electron microscopy (STEM), and thermodynamic modeling. In contrast to the previous reports, an orthorhombic structure (space group Cmcm) and a composition of NdAgMg11 are determined. The present experimental data are used to construct a thermodynamic description of the Mg–Ag–Nd system which is embedded in a multicomponent Mg alloy database. Implications on the formation of temperature range and thermal stability of this phase and alloy solidification are discussed based on the calculated Mg–Nd–Ag phase diagram and Scheil solidification paths of alloys. The impact of Ag-replacement in such QE alloys by Zn-addition in the Mg–Ag–Nd–Zn (QEZ) alloy system is elaborated using appropriate thermodynamic simulations to reveal the competition with other intermetallics. These data are suggested to contribute to ICME of magnesium alloys.

AB - The intermetallic phase (designated δ phase) in the solution-treated microstructure of commercial magnesium alloy QE22 (Mg–2.5Ag–2.0Nd–0.7Zr, wt%) has been investigated using scanning electron microscopy, electron diffraction, atomic-resolution scanning transmission electron microscopy (STEM), and thermodynamic modeling. In contrast to the previous reports, an orthorhombic structure (space group Cmcm) and a composition of NdAgMg11 are determined. The present experimental data are used to construct a thermodynamic description of the Mg–Ag–Nd system which is embedded in a multicomponent Mg alloy database. Implications on the formation of temperature range and thermal stability of this phase and alloy solidification are discussed based on the calculated Mg–Nd–Ag phase diagram and Scheil solidification paths of alloys. The impact of Ag-replacement in such QE alloys by Zn-addition in the Mg–Ag–Nd–Zn (QEZ) alloy system is elaborated using appropriate thermodynamic simulations to reveal the competition with other intermetallics. These data are suggested to contribute to ICME of magnesium alloys.

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