一种镍基单晶高温合金的成分设计

Composition design in the nickel-base single crystal superalloy

本文应用电子空穴理论以及d电子理论设计了一种成分为5.81%Al-7.33%Ta-3.42%Cr-6.05%Mo-3.76%Co-7%W-3.75%Ru的镍基单晶高温合金,合金电子空位数Nv=2.313,d轨道能级Md=9.997。合金组织形貌均匀,且无TCP相析出。在1070℃、137Mpa的条件下高温蠕变时间为124h。结果表明,通过电子空穴理论、d电子理论设计的镍基单晶高温合金拥有良好的高温蠕变性能,这两种合金成分设计方法可以一定程度上避免设计缺陷,减小合金TCP相析出的可能性。

By means of electron hole theory and d electron theory in the paper, the single crystal nickel-base superalloy containing of 5.81% Al-7.33% Ta–3.42% Cr-6.05% Mo-3.76% Co-7% W-3.75% Ru was designed, and the electron vacancy number Nv = 2.313 and d orbita energy level Md = 9.997. The microstructure morphology of the alloy is uniform without TCP phase. Under the applied stress of 137 MPa at 1020℃, the creep lifetime of the alloy is measured to be 124 h. Results show that the single crystal nickel-base superalloy has good high temperature creep properties through electron hole theory and d electron theory, and the two methods of alloy composition design avoid defect in design, and reduce the possibility of generating TCP phase in the alloy.