Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing

Jiehua Li; Fredrik S. Hage; Ali Gholinia; Pan Xie; Yu Zhang; Yujuan Wu; Liming Peng; Sarah J. Haigh; Quentin M. Ramasse; Peter Schumacher

doi:10.1007/978-3-319-72332-7_59

Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing

Jiehua Li^*, Fredrik S. Hage, Ali Gholinia, Pan Xie, Yu Zhang, Yujuan Wu, Liming Peng, Sarah J. Haigh, Quentin M. Ramasse, Peter Schumacher

^*Corresponding author for this work

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

Abstract

Precipitation hardening is one of the dominant strengthening mechanisms for Mg alloys, especially for Mg alloys containing rare earth elements. However, precipitation hardening of conventional Mg alloys (such as AZ91D, ZK60 or even WE54/43) is relatively weaker than in high performance Al alloys [such as Al–Cu–Mg based alloys (2024) and Al–Zn–Mg–Cu based alloys (7075, 7050)]. Further avenues for improving precipitation hardening of Mg alloy are therefore being actively explored. In this paper, co-precipitation on the basal and prismatic planes of the α-Mg matrix in a Mg–2.4Gd–0.4Ag–0.1Zr alloy after over-ageing at 200 °C for 2048 h was investigated using high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy (EELS). Ag was observed within precipitates on the basal plane, while Gd was observed within precipitates on both the basal and prismatic planes. Furthermore, Ag, Gd-rich clusters were also observed in the vicinity of these precipitates, which were proposed to form during solution treatment and to coarsen during subsequent ageing treatment.

Original language	English
Title of host publication	Magnesium Technology 2018
Editors	Kiran N. Solanki, Vineet Joshi, Neale R. Neelameggham, Dmytro Orlov
Publisher	Springer Nature
Pages	379-383
Number of pages	5
ISBN (Print)	9783319723310
DOIs	https://doi.org/10.1007/978-3-319-72332-7_59
Publication status	Published - 1 Jan 2018
Event	International Symposium on Magnesium Technology, 2018 - Phoenix, United States Duration: 11 Mar 2018 → 15 Mar 2018

Publication series

Name	Minerals, Metals and Materials Series
Volume	Part F7
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	International Symposium on Magnesium Technology, 2018
Country/Territory	United States
City	Phoenix
Period	11/03/18 → 15/03/18

Keywords

EELS
HAADF-STEM
Mg alloy
Precipitation
Precipitation hardening

Access to Document

10.1007/978-3-319-72332-7_59

Cite this

Li, J., Hage, F. S., Gholinia, A., Xie, P., Zhang, Y., Wu, Y., Peng, L., Haigh, S. J., Ramasse, Q. M., & Schumacher, P. (2018). Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing. In K. N. Solanki, V. Joshi, N. R. Neelameggham, & D. Orlov (Eds.), Magnesium Technology 2018 (pp. 379-383). (Minerals, Metals and Materials Series; Vol. Part F7). Springer Nature. https://doi.org/10.1007/978-3-319-72332-7_59

@inproceedings{d6cc8551acd443b7932359f8142782d7,

title = "Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing",

abstract = "Precipitation hardening is one of the dominant strengthening mechanisms for Mg alloys, especially for Mg alloys containing rare earth elements. However, precipitation hardening of conventional Mg alloys (such as AZ91D, ZK60 or even WE54/43) is relatively weaker than in high performance Al alloys [such as Al–Cu–Mg based alloys (2024) and Al–Zn–Mg–Cu based alloys (7075, 7050)]. Further avenues for improving precipitation hardening of Mg alloy are therefore being actively explored. In this paper, co-precipitation on the basal and prismatic planes of the α-Mg matrix in a Mg–2.4Gd–0.4Ag–0.1Zr alloy after over-ageing at 200 °C for 2048 h was investigated using high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy (EELS). Ag was observed within precipitates on the basal plane, while Gd was observed within precipitates on both the basal and prismatic planes. Furthermore, Ag, Gd-rich clusters were also observed in the vicinity of these precipitates, which were proposed to form during solution treatment and to coarsen during subsequent ageing treatment.",

keywords = "EELS, HAADF-STEM, Mg alloy, Precipitation, Precipitation hardening",

author = "Jiehua Li and Hage, {Fredrik S.} and Ali Gholinia and Pan Xie and Yu Zhang and Yujuan Wu and Liming Peng and Haigh, {Sarah J.} and Ramasse, {Quentin M.} and Peter Schumacher",

year = "2018",

month = jan,

day = "1",

doi = "10.1007/978-3-319-72332-7_59",

language = "English",

isbn = "9783319723310",

series = "Minerals, Metals and Materials Series",

publisher = "Springer Nature",

pages = "379--383",

editor = "Solanki, {Kiran N.} and Vineet Joshi and Neelameggham, {Neale R.} and Dmytro Orlov",

booktitle = "Magnesium Technology 2018",

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note = "International Symposium on Magnesium Technology, 2018 ; Conference date: 11-03-2018 Through 15-03-2018",

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Li, J, Hage, FS, Gholinia, A, Xie, P, Zhang, Y, Wu, Y, Peng, L, Haigh, SJ, Ramasse, QM & Schumacher, P 2018, Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing. in KN Solanki, V Joshi, NR Neelameggham & D Orlov (eds), Magnesium Technology 2018. Minerals, Metals and Materials Series, vol. Part F7, Springer Nature, pp. 379-383, International Symposium on Magnesium Technology, 2018, Phoenix, United States, 11/03/18. https://doi.org/10.1007/978-3-319-72332-7_59

Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing. / Li, Jiehua; Hage, Fredrik S.; Gholinia, Ali et al.
Magnesium Technology 2018. ed. / Kiran N. Solanki; Vineet Joshi; Neale R. Neelameggham; Dmytro Orlov. Springer Nature, 2018. p. 379-383 (Minerals, Metals and Materials Series; Vol. Part F7).

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing

AU - Li, Jiehua

AU - Hage, Fredrik S.

AU - Gholinia, Ali

AU - Xie, Pan

AU - Zhang, Yu

AU - Wu, Yujuan

AU - Peng, Liming

AU - Haigh, Sarah J.

AU - Ramasse, Quentin M.

AU - Schumacher, Peter

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Precipitation hardening is one of the dominant strengthening mechanisms for Mg alloys, especially for Mg alloys containing rare earth elements. However, precipitation hardening of conventional Mg alloys (such as AZ91D, ZK60 or even WE54/43) is relatively weaker than in high performance Al alloys [such as Al–Cu–Mg based alloys (2024) and Al–Zn–Mg–Cu based alloys (7075, 7050)]. Further avenues for improving precipitation hardening of Mg alloy are therefore being actively explored. In this paper, co-precipitation on the basal and prismatic planes of the α-Mg matrix in a Mg–2.4Gd–0.4Ag–0.1Zr alloy after over-ageing at 200 °C for 2048 h was investigated using high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy (EELS). Ag was observed within precipitates on the basal plane, while Gd was observed within precipitates on both the basal and prismatic planes. Furthermore, Ag, Gd-rich clusters were also observed in the vicinity of these precipitates, which were proposed to form during solution treatment and to coarsen during subsequent ageing treatment.

AB - Precipitation hardening is one of the dominant strengthening mechanisms for Mg alloys, especially for Mg alloys containing rare earth elements. However, precipitation hardening of conventional Mg alloys (such as AZ91D, ZK60 or even WE54/43) is relatively weaker than in high performance Al alloys [such as Al–Cu–Mg based alloys (2024) and Al–Zn–Mg–Cu based alloys (7075, 7050)]. Further avenues for improving precipitation hardening of Mg alloy are therefore being actively explored. In this paper, co-precipitation on the basal and prismatic planes of the α-Mg matrix in a Mg–2.4Gd–0.4Ag–0.1Zr alloy after over-ageing at 200 °C for 2048 h was investigated using high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy (EELS). Ag was observed within precipitates on the basal plane, while Gd was observed within precipitates on both the basal and prismatic planes. Furthermore, Ag, Gd-rich clusters were also observed in the vicinity of these precipitates, which were proposed to form during solution treatment and to coarsen during subsequent ageing treatment.

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KW - HAADF-STEM

KW - Mg alloy

KW - Precipitation

KW - Precipitation hardening

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ER -

Co-precipitation on the basal and prismatic planes in Mg–Gd–Ag–Zr alloy subjected to over-ageing

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