GH99镍基合金在室温拉伸变形条件下,被位错切割过渡到被位错绕过的γ'[Ni_3(Al,Ti)]质点的临界直径约为60nm.在同样条件下,该合金γ'强化的方式属于被位错切割机制.增加γ'相中Al含量能提高其反相畴界能和增大合金塑性变形的临界分切应力.GH99镍基合金的室温屈服强度理论计算值与实测值很接近.由γ'沉淀强化所贡献的强度占总强度的45％到64％,它随γ'相中Al含量的增多而增大.晶界碳化物强化所贡献的强度很少,只占2—3％。
The critical diameter of γ′ [Ni_3(Al,Ti)] particales in the transition from dislocation cutting to by-passing in a Ni-base alloy GH99 under tensile deformation at room temperature is about 60 nm. Under the same condition, the γ′ strengthening mechanism is of the dislocation cutting. To the γ′-phase, an increase in Al content makes to raise its antiphase domain boundary energy and the critical resolved shear stress on plastic deformation of the alloy. The theoretically calculated yield strength of the alloy GH99 at room temperature is close to the measured one. The γ′ precipitation strengthening contributes to the yield strength of the alloy makiing up about 45 to 64% of the total, and increases with the increase of its Al content, But the strengthening by grain boundary carbide is not worth more than 2—3%.
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