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Precipitation behavior of dispersoids and elevated-temperature properties in Al–Si–Mg foundry alloy with Mo addition

Published online by Cambridge University Press:  16 July 2019

S. Chen ,
K. Liu  and
X-G. Chen
S. Chen
Affiliation:
Department of Applied Sciences, University of Québec at Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
K. Liu*
Affiliation:
Department of Applied Sciences, University of Québec at Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
X-G. Chen
Affiliation:
Department of Applied Sciences, University of Québec at Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
*
a)Address all correspondence to this author. [email protected]
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Abstract

In the present work, Mo was added to an Al–Si–Mg foundry alloy to study its influence on the evolution of dispersoids during various heat treatments. The microhardness and the elevated-temperature tensile properties and creep resistance were measured to evaluate the contribution of dispersoids. Results showed that the addition of Mo greatly promoted the formation of α-dispersoids. During solution treatment, the formation of α-dispersoids started after 8 h at 500 °C. At high temperature (540 °C), the coarsening of dispersoids with increasing time became predominant. The optimum condition of dispersoids can be reached by 520 °C/12 h or 500 °C/4 h + 540 °C/2 h, leading to the highest differences in microhardness between the Mo-containing alloy and base alloy. The tensile strengths were improved at both room temperature and elevated temperatures, while the elongation at elevated temperature was greatly increased. The creep resistance at elevated temperature is further enhanced due to the Mo addition.

Keywords

Al–Si foundry alloyheat treatmentdispersoidselevated-temperature propertiescreep resistance
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 18 , 30 September 2019 , pp. 3071 - 3081
Copyright
Copyright © Materials Research Society 2019 

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