Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at.%) alloys

J. Wu; Y.l. Chiu; I.p. Jones

doi:10.1016/j.jallcom.2015.11.209

Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at.%) alloys

J. Wu, Y.l. Chiu, I.p. Jones

Metallurgy and Materials

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Abstract

The microstructure and hardness of as-cast Mg-4.2Zn-0.8Y-xGd (at.%, x = 0, 0.5, 1) alloys were investigated. It has been found that MgZn3Y (H phase) and Mg₃Zn₃Y₂ (W phase) are the main precipitates in the as-cast alloy without Gd. A long-period stacking ordered (LPSO) phase formed upon adding Gd, indicating that the Gd addition enhanced the stability of the LPSO phase. The Gd addition also increased the overall amount of the alloying elements; thus the grain size decreased and the volume fraction of the secondary phases increased resulting in increased hardness of the as-cast alloys. The Y and Gd partition between different phases was investigated. The results show no clear preference between Y and Gd when forming the matrix and the secondary phases, though small fluctuations exist.

Original language	English
Pages (from-to)	455-460
Journal	Journal of Alloys and Compounds
Volume	661
Early online date	6 Dec 2015
DOIs	https://doi.org/10.1016/j.jallcom.2015.11.209
Publication status	Published - 15 Mar 2016

Keywords

Magnesium alloys
Gadolinium addition
Long period stacking ordered (LPSO) phase
Quasi-crystalline phase

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Wu_et_al_Effect_of_Gd_on_the_microstructure_Journal_of_Alloys_and_Compounds_2015
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Cite this

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title = "Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at.%) alloys",

abstract = "The microstructure and hardness of as-cast Mg-4.2Zn-0.8Y-xGd (at.%, x = 0, 0.5, 1) alloys were investigated. It has been found that MgZn3Y (H phase) and Mg3Zn3Y2 (W phase) are the main precipitates in the as-cast alloy without Gd. A long-period stacking ordered (LPSO) phase formed upon adding Gd, indicating that the Gd addition enhanced the stability of the LPSO phase. The Gd addition also increased the overall amount of the alloying elements; thus the grain size decreased and the volume fraction of the secondary phases increased resulting in increased hardness of the as-cast alloys. The Y and Gd partition between different phases was investigated. The results show no clear preference between Y and Gd when forming the matrix and the secondary phases, though small fluctuations exist.",

keywords = "Magnesium alloys, Gadolinium addition, Long period stacking ordered (LPSO) phase, Quasi-crystalline phase",

author = "J. Wu and Y.l. Chiu and I.p. Jones",

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T1 - Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at.%) alloys

AU - Wu, J.

AU - Chiu, Y.l.

AU - Jones, I.p.

PY - 2016/3/15

Y1 - 2016/3/15

N2 - The microstructure and hardness of as-cast Mg-4.2Zn-0.8Y-xGd (at.%, x = 0, 0.5, 1) alloys were investigated. It has been found that MgZn3Y (H phase) and Mg3Zn3Y2 (W phase) are the main precipitates in the as-cast alloy without Gd. A long-period stacking ordered (LPSO) phase formed upon adding Gd, indicating that the Gd addition enhanced the stability of the LPSO phase. The Gd addition also increased the overall amount of the alloying elements; thus the grain size decreased and the volume fraction of the secondary phases increased resulting in increased hardness of the as-cast alloys. The Y and Gd partition between different phases was investigated. The results show no clear preference between Y and Gd when forming the matrix and the secondary phases, though small fluctuations exist.

AB - The microstructure and hardness of as-cast Mg-4.2Zn-0.8Y-xGd (at.%, x = 0, 0.5, 1) alloys were investigated. It has been found that MgZn3Y (H phase) and Mg3Zn3Y2 (W phase) are the main precipitates in the as-cast alloy without Gd. A long-period stacking ordered (LPSO) phase formed upon adding Gd, indicating that the Gd addition enhanced the stability of the LPSO phase. The Gd addition also increased the overall amount of the alloying elements; thus the grain size decreased and the volume fraction of the secondary phases increased resulting in increased hardness of the as-cast alloys. The Y and Gd partition between different phases was investigated. The results show no clear preference between Y and Gd when forming the matrix and the secondary phases, though small fluctuations exist.

KW - Magnesium alloys

KW - Gadolinium addition

KW - Long period stacking ordered (LPSO) phase

KW - Quasi-crystalline phase

U2 - 10.1016/j.jallcom.2015.11.209

DO - 10.1016/j.jallcom.2015.11.209

M3 - Article

SN - 09258388

VL - 661

SP - 455

EP - 460

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at.%) alloys

Abstract

Keywords

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