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Philosophical Magazine Volume 94, 2014 - Issue 21
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Part A: Materials Science

A new metastable precipitate phase in Mg–Gd–Y–Zr alloy

H. ZhouNational Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai200240, China;Department of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA
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W.Z. XuDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA
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W.W. JianDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA
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G.M. ChengDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA
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X.L. MaDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA
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W. GuoNational Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai200240, China;Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai200240, China
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S.N. MathaudhuDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USA;Materials Science Division, US Army Research Office, Research Triangle Park, Durham, NC27709, USA
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Q.D. WangNational Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai200240, China;Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai200240, ChinaCorrespondence[email protected]
&
Y.T. ZhuDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, NC27695, USACorrespondence[email protected]
 show all
Pages 2403-2409 | Received 24 Feb 2014, Accepted 03 Apr 2014, Published online: 13 May 2014
 
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Abstract

Mg–RE alloys are among the strongest Mg-based alloys due to their unique precipitation structures. A previously unobserved metastable phase (βT) is found to coexist with reported β″ and β′ metastable phases under peak ageing conditions in a Mg–Gd–Y–Zr alloy. The position of the RE elements within the βT phase is identified using atomic-resolution high-angle annular dark field scanning transmission electron microscopy imaging, and the βT phase is shown to have an orthorhombic structure with a stoichiometry of Mg5RE. Based on these observations, a new precipitation sequence is proposed.

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