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Effects of heat treatments on microstructure and properties of nickel–aluminum bronze fabricated by centrifugal casting

Published online by Cambridge University Press:  12 December 2016

Gaoyong Lin ,
Hongyang Wang ,
Yuyong Wei ,
Zongpeng Zhang  and
Ke Zhou
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
Hongyang Wang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Yuyong Wei
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zongpeng Zhang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Ke Zhou
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A kind of nickel–aluminum bronze (Cu–10Al–4Fe–4Ni) prepared by centrifugal casting (CC) and gravity casting (GC), respectively, were investigated. The results indicate that CC alloy, which is totally different from GC alloy, consists of α, κI, κII, κIII, κIV, and β′ phases and the microstructures of CC alloy shows nonuniformities from external to internal layer mainly because the distribution of iron and nickel are influenced by centrifugal force. Besides, it is noted that comprehensive mechanical properties of CC alloy are superior to those of GC alloy. Additionally, heat treatments were performed on CC alloy. The results demonstrate the optimal heat treatment is aging at 450 °C/1 h by air cooling after solution treated at 890 °C/1 h by water quench. The ultimate tensile strength and hardness are increased by about 10% and 56%, respectively, and wear resistance is also greatly improved. However, the elongation is decreased by 53%.

Keywords

nickel–aluminum bronzecentrifugal castingheat treatment
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3832 - 3840
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Copyright
Copyright © Materials Research Society 2016 

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