Improvement of aging kinetics and precipitate size refinement in Mg-Sn alloys by hafnium additions

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:651

Article

Behdad, S.¹  Zhou, L.^2,3  Henderson, H. B.⁴  Manuel, M. V.⁴  Sohn, Y.^2,3  Agarwal, A.¹  Boesl, B.¹ 

[1] Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA

[2] Univ Cent Florida, Dept Mat Sci & Engn, Orlando, FL 32816 USA

[3] Univ Cent Florida, Adv Mat Proc & Anal Ctr, Orlando, FL 32816 USA

[4] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

关键词: Magnesium alloys;    Precipitation;    Micro-alloying;    Transmission electron microscopy (TEM);   

DOI  :  10.1016/j.msea.2015.11.043

来源: Elsevier

【 摘 要 】

Two Mg-Sn alloys were microalloyed by addition of Hafnium and their age-hardening response was studied at 200 degrees C. Time to reach peak hardness was significantly reduced and improved by Hf addition. TEM study showed Hf clusters in the close vicinity and at the surface of Mg2Sn precipitates, which confirms that Hf clusters act as additional nucleation centers for Mg2Sn precipitate formation. Our results support the validity of thermoldnetic criterion proposed by Mendis for selection of microalloying elements in order to refine precipitate size, accelerate aging kinetics and enhance peak hardness. (c) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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