THERMODYNAMIC STUDY ON EQUILIBRIUM PRECIPITATION PHASES IN A NOVEL Ni-Co BASE SUPERALLOY
Received date: 2009-07-27
Revised date: 2009-11-20
Online published: 2010-03-11
Supported by
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)
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.
YU Yi , XUN Feng , DONG Xian-Beng , ZHANG Lan-Ting , DAN Ai-Dang . THERMODYNAMIC STUDY ON EQUILIBRIUM PRECIPITATION PHASES IN A NOVEL Ni-Co BASE SUPERALLOY[J]. Acta Metall Sin, 2010 , 46(3) : 334 -339 . DOI: 10.3724/SP.J.1037.2009.00515
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