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 andγ/γ' mismatch have been analyzed.It is found that theγ/γ' mismatch increases with the increase of Ti/Al (atomic ratio).The volume fraction ofγ' 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,theγ' solvus temperature decreases by Co additions.As a result,the range of processing temperature is extended.Theγ/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 ofηphase.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.
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