<正> 曾经报道过加1.0％Zr改善定向铸造高温合金的中温力学性能.我们以前的工作也证明Zr和Hf在铸造镍基高温合金中的作用极为相似,本文进一步研究在上述合金中以Zr代Hf的可能性.
Zr promotes the formation of eutectic γ′, MC, Ni_5Zr and (Zr, Ti)_2 SC and stabilizes the microstructure of Ni-base superalloys at high temperatures as that Hf does.Furthermore, it enhances the mechanical properties of as-cast alloys at medium temperatures. But the efficiency of it is not as strong as Hf, because of its lower solubility in eutectic γ′. However, the solubility of Zr in Ni_5M is higher than that of Hf, it is helpful to the formation of Ni_5 M. This implies that one can not substitute Zr for Hf with same atomic fraction. Combination of Zr and Hf additive is beneficial to the mechanical properties of the alloys at medium temperatures.
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