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The quench sensitivity of SiCp/2024Al composites based on Jominy end quench test

Published online by Cambridge University Press:  06 April 2016

Yuan Liu ,
Wenjun Li ,
Gaohui Wu  and
Daming Jiang
Yuan Liu*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
Wenjun Li*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
Gaohui Wu*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
Daming Jiang*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)[email protected]
c)[email protected]
d)[email protected]
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Abstract

The quench sensitivity of 45vol% SiCp/2024Al composites manufactured by squeezed casting method has been investigated by employing Jominy end quench test which was designed to simulate the one dimension cooling process of the composites. It can be found that the cooling rates decreased with the increase of the distance from the quenched end. The results indicated that the as-quenched and as-aged hardness exhibited a significant decrease with increasing the distance from the quenched end. The depths corresponding to 90% of maximum as-aged hardness were 30 mm. When the quench cooling rate was 23.5 °C/s, the hardness was the maximum. The variation of as-aged hardness with cooling rate was identical with the overall enthalpy involved in the precipitation of all metastable phases (S″ + θ″ + S′ + θ′). The SiCp/2024Al composites exhibited two sensitivity regimes: at slower cooling rates the quench sensitivity had been attributed to the formation of intermediate precipitates during cooling, while it was mildly quench sensitive at higher cooling rates.

Keywords

Alcompositehardness
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1237 - 1243
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Copyright
Copyright © Materials Research Society 2016 

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