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Acta Metall Sin  2010, Vol. 46 Issue (3): 334-339    DOI: 10.3724/SP.J.1037.2009.00515
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THERMODYNAMIC STUDY ON EQUILIBRIUM PRECIPITATION PHASES IN A NOVEL Ni-Co BASE SUPERALLOY
WANG Yi; SUN Feng; DONG Xianping; ZHANG Lanting; SHAN Aidang
School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240
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WANG Yi SUN Feng DONG Xianping ZHANG Lanting SHAN Aidang. THERMODYNAMIC STUDY ON EQUILIBRIUM PRECIPITATION PHASES IN A NOVEL Ni-Co BASE SUPERALLOY. Acta Metall Sin, 2010, 46(3): 334-339.

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Abstract  

Thermodynamic properties of the traditional U720Li alloy and the new Ni-Co base superalloy have been studied using JMatPro and the latest relevant database for Ni base superalloys. The effects of chemical composition on the equilibrium precipitation phases, process-ability and γ/γ' mismatch have been analyzed. It is found that the γ/γ' mismatch increases with the increase of Ti/Al (atomic ratio). The volume fraction of γ' is proportional to the Ti+Al contents (atomic fraction). Therefore, by increasing the Ti/Al ratio and Ti+Al content, the yield strength of alloys can be improved. On the other hand, the γ' solvus temperature decreases by Co additions. As a result, the range of processing temperature is extended. The γ/γ' mismatch also increases with Co additions, which adds additional strengthening to the alloy. Moreover, high Ti/Al ratio or low Co content promotes the precipitation of η phase. Thus, Ni-Co base superalloys with high Ti+Al content, Ti/Al ratio and Co content bear an improved strength, phase stabilities and process-ability.

Key words:  Ni-Co base superalloy      thermodynamic calculation      precipitation phase      mismatch     
Received:  27 July 2009     
Fund: 

Supported by Major Program for the Fundamental Research of Science and Technology Committee  of the Shanghai Municipality (No.08dj1400402) and Innovation Program of Shanghai Municipal Education Committee (No.09ZZ16)

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00515     OR     https://www.ams.org.cn/EN/Y2010/V46/I3/334

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