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A comparative study on effects of special casting processes on microstructural development in Cu–10Al–4Fe–4Ni alloy

Published online by Cambridge University Press:  22 October 2013

Gaoyong Lin ,
Yuxia Lei ,
Juhua Zeng ,
Han Li  and
Xiuzhi Xu
Gaoyong Lin*
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China; and Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
Yuxia Lei
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Juhua Zeng
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Han Li
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Xiuzhi Xu
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
*
a)Address all correspondence to this author. e-mail: mater218@163.com
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Abstract

Suction casting (SC) and centrifugal casting (CC) are two common special casting processes. The influences of SC and CC on the microstructural development of Cu–10Al–4Fe–4Ni aluminum bronzes were investigated with continuous cooling method. The results indicate that α, β′, KII, and KIII phases are observed in the quasicast microstructure via the SC process with the precipitation sequence of KII → α → KIII. Additionally, KI and KIV are observed in the quasicast microstructure via the CC process with the precipitation sequence of α + KⅠ → KII → KIV → KIII. Phase initial precipitation temperatures of the CC process are higher than that of the SC process, especially for α phase. As the quenching temperature decreases, the hardness of both alloys shows a rapid decline trend and finally reaches a steady state. It is found that the eutectoid decomposition (β → α + KIII) barely affects the hardness of the alloys.

Keywords

castingmicrostructurephase transformation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 20 , 28 October 2013 , pp. 2874 - 2880
Copyright
Copyright © Materials Research Society 2013 

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References

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