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Microstructure evolution and quench sensitivity of Cu–10Ni–3Al–0.8Si alloy during isothermal treatment

Published online by Cambridge University Press:  05 February 2015

Leinuo Shen ,
Zhou Li ,
Qiyi Dong ,
Zhu Xiao ,
Si Li  and
Qian Lei
Leinuo Shen
Affiliation:
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zhou Li*
Affiliation:
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Qiyi Dong
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Zhu Xiao
Affiliation:
Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China
Si Li
Affiliation:
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Qian Lei
Affiliation:
Department of Materials Physics and Chemistry, 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

The variation of properties and evolution of microstructure of Cu–10Ni–3Al–0.8Si alloy during isothermal and aging treatment was studied. The time–temperature–property curves of the alloy were established. The nose temperature of the alloy was about 662 °C, and the alloy presented high quench sensitivity when quenched in the nose temperature zone. Discontinuous precipitation occurred when Cu–10Ni–3Al–0.8Si alloy was isothermally treated at 550 °C, and the discontinuous precipitates at the grain boundary became coarse when the isothermal temperature increased to 650 °C. Further increasing the isothermal temperature to 750 °C, cellular precipitation occurred in the alloy. Both Ni3Al precipitates with L12 ordered structure and δ-Ni2Si precipitates with DO22 ordered structure precipitated in the isothermally treated Cu–10Ni–3Al–0.8Si alloy. The orientation relationships between the precipitates and matrix were determined as ${[001]_{{\rm{Cu}}}}{\left\| {{{[001]}_{{\rm{N}}{{\rm{i}}_3}{\rm{Al}}}}\left\| {[001]} \right.} \right._\delta }$, ${(110)_{{\rm{Cu}}}}{\left\| {{{(110)}_{{\rm{N}}{{\rm{i}}_3}{\rm{Al}}}}\left\| {(010)} \right.} \right._\delta }$, and ${(1\bar 10)_{{\rm{Cu}}}}\left\| {{{(1\bar 10)}_{{\rm{N}}{{\rm{i}}_3}{\rm{Al}}}}} \right\|{(100)_\delta }$.

Keywords

Cumicrostructuresecond phases
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 5 , 14 March 2015 , pp. 736 - 744
Copyright
Copyright © Materials Research Society 2015 

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