ANTIPHASE DOMAIN BOUNDARY ENERGY OF γ′ [Ni_3(Al,Ti)] PARTICLES WITH VARIOUS Al CONTENTS AND THEIR STRENGTHENING CONTRIBUTION TO A Ni-BASE ALLOY GH99
by YANG Nansen; WEI yuhuan; SONG Chenyi; JIAO Lanying (Central Iron and Steel Research Institute; Ministry of Metallurgical Indastry; Beijing)
Cite this article:
by YANG Nansen; WEI yuhuan; SONG Chenyi; JIAO Lanying (Central Iron and Steel Research Institute; Ministry of Metallurgical Indastry; Beijing). ANTIPHASE DOMAIN BOUNDARY ENERGY OF γ′ [Ni_3(Al,Ti)] PARTICLES WITH VARIOUS Al CONTENTS AND THEIR STRENGTHENING CONTRIBUTION TO A Ni-BASE ALLOY GH99. Acta Metall Sin, 1986, 22(6): 29-35.
Abstract 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%.
