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Improvement in elevated-temperature properties of Al–13% Si piston alloys by dispersoid strengthening via Mn addition

Published online by Cambridge University Press:  11 May 2018

Kun Liu  and
X-Grant Chen
Kun Liu*
Affiliation:
Department of Applied Sciences, University of Quebec at Chicoutimi, Saguenay, Quebec G7H 2B1, Canada
X-Grant Chen
Affiliation:
Department of Applied Sciences, University of Quebec at Chicoutimi, Saguenay, Quebec G7H 2B1, Canada
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Eutectic Al–13% Si alloys are widely used in automotive components, such as pistons and cylinder heads. Recently, the demand on the performance of piston alloys at high temperature is greatly increased to enhance the engine efficiency and to reduce exhaust emission. In the present work, Mn was added to strengthen the aluminum matrix via the formation of thermally stable dispersoids. The evolution of dispersoids during heat treatment and their influence on elevated-temperature properties were studied. The results showed that the as-cast microstructures in the experimental alloys without/with Mn addition were similar, which were composed of eutectic Si, primary Mg2Si, Al–Fe–Ni, Al–Cu–Ni, and π-Al–Mg–Fe–Si intermetallic phases. In the alloy with Mn addition, a number of α-Al(Mn,Fe)Si dispersoids started to form after a heat treatment at 425 °C for 24 h and reached the peak condition at 500 °C for 6 h, resulting in a remarkable increase of the microhardness at room temperature and the improvement in the yield strength and creep resistance at 300 °C. As a complementary strengthening mechanism, the dispersoid strengthening in the aluminum matrix provides a novel approach to improve the elevated-temperature properties of Al–Si piston alloys.

Keywords

Al–Si piston alloysdispersoidsMnelevated-temperature properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3430 - 3438
Copyright
Copyright © Materials Research Society 2018 

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