利用热力学计算软件JMatPro和相应的镍基高温合金数据库,研究了U720Li合金以及在此基础上研发的新型Ni-Co基高温合金的化学成分对平衡相的析出行为、加工性能和γ/γ'晶格错配度的影响,结果表明:Ti/Al值(原子比)的增加提高了合金中γ/γ'相的品格错配度,γ'析出相的含量随Ti+Al含量(原子分数)的增加而增加.因此,增加Ti/Al值和Ti+Al含量能提高合金的高温强度.Co含量的升高可以拓宽合金的加工窗口,改善合金的加工能力,并且还可以增加合金γ/γ'相的晶格错配度,提高合金错配强化的效果,同时,Ti/Al值的增加促进合金中η相析出,而Co含量的增加具有抑制,η相的效果,因此,在Co含量较高的Ni-Co基高温合金中,适当提高Ti含量,增加Ti/Al值对提高合金高温强度有利,
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 in proved. 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.
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