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研究了750~1050℃下长期时效对Ni3Al基高温合金沉淀强化的影响。结果表明:镍基高温合金在不同温度时效处理一定时间后,γ′沉淀强化相呈球形分散在γ基体上,随时效温度升高,γ′沉淀相微粒粗化,合金屈服强度降低,拉伸塑性提高。随着时效时间的延长,合金的屈服强度增大,但当时效时间超过1000 h之后,屈服强度和伸长率开始下降。Ni-Al合金的性能和沉淀相的颗粒大小、分布、体积分数及粗化速率等因素有关。
The effect of long-term aging at 750 ~ 1050 ℃ on the precipitation strengthening of Ni3Al-based superalloy was studied. The results show that the γ ’precipitation strengthening phase is spherically dispersed on the γ matrix after the aging treatment at different temperatures for a certain time. With the aging temperature increasing, γ’ precipitated particles coarsening, the yield strength of the alloy decreases, Plasticity increased. As the aging time increases, the yield strength of the alloy increases, but the yield strength and elongation begin to decrease after the aging time exceeds 1000 h. The properties of Ni-Al alloys are related to the particle size, distribution, volume fraction and coarsening rate of the precipitated phase.