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

Two Mg–Sn alloys were microalloyed by addition of Hafnium and their age-hardening response was studied at 200°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 confi...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 651; pp. 854 - 858
Main Authors Behdad, S., Zhou, L., Henderson, H.B., Manuel, M.V., Sohn, Y., Agarwal, A., Boesl, B.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.01.2016
Subjects
Alloys
Clusters
Hafnium
Hafnium base alloys
Hardness
Magnesium alloys
Magnesium base alloys
Micro-alloying
Precipitates
Precipitation
Transmission electron microscopy (TEM)
Micro-alloying
Precipitation
Transmission electron microscopy (TEM)
Magnesium alloys
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Summary:Two Mg–Sn alloys were microalloyed by addition of Hafnium and their age-hardening response was studied at 200°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 thermokinetic criterion proposed by Mendis for selection of microalloying elements in order to refine precipitate size, accelerate aging kinetics and enhance peak hardness.
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ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.11.043