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本文报导了对以Ni_3Al为基的r′单晶体所做的蠕变及持久试验的结果。结果表明r′晶体的稳态蠕变速ε_s遵从 ε_s=Cσ~mexp(-Q_c~′/RT)的关系,指数m仅和温度有关。m(850℃)=3.95,m(950℃)=3.62,对Ni_3Al,Q_c~′=88kcal/g-at,合金元素Ti,Nb,W都使Q_e~′升高,其中Nb的作用最大,然而W在提高蠕变强度上最有效。 晶体取向对ε_s有显著影响。<111>取向的Ni_3Al晶体ε_s最低,持久寿命t_r最长。在1050℃,σ=5kg/mm~2时,t_r可≥100小时,Ni_3Al单晶体也同样符合Monkman-Grant关系t_r(ε_s)~p=常数,其中p=0.82。 r′晶体蠕变中的滑移系统是{111}<211>。
This paper reports the results of creep and long-term tests on a single-crystal Ni-3Al-based single crystal. The results show that the steady-state creep rate ε_s of r ’crystal follows the relation of ε_s = Cσ ~ mexp (-Q_c ~’ / RT), and the exponent m is only related to temperature. In the case of Ni_3Al and Q_c ~ ’= 88kcal / g-at, all the alloying elements Ti, Nb and W increased Q_e ~’, of which Nb was the largest, However, W is most effective at increasing creep strength. The crystal orientation has a significant effect on ε_s. The <111> oriented Ni_3Al crystal has the lowest ε_s and the longest lasting lifetime t_r. When σ = 5kg / mm ~ 2 at 1050 ℃, t_r can be ≥100 hours. The Ni_3Al single crystal also satisfies the Monkman-Grant relationship t_r (ε_s) ~ p = constant, where p = 0.82. The slip system in r ’crystal creep is {111} <211>.