The Influence of Duration of Preliminary Mechanical Activation on Microhardness of Specimens of Ni3Al Intermetallide Synthesized Under Conditions of Spark Plasma Sintering

Дитенберг, И. А.; Корчагин, М. А.; Мельников, В. В.; Osipov, D. A.; Gavrilov, A. I.; Esikov, Maksim A.; Mali, V. I.; Grinyaev, K. V.; Смирнов, И. В.; Tsverova, A. S.; Sukhanov, I. I.

doi:10.1007/s11182-019-01622-1

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“…The formation of a finer-grained structural state after SPS with preliminary MA and a level of microdistortions being twice higher compared to that after SPS with preliminary mixing in a mortar, from our perspective, predetermines a higher level of strength properties (H V , σ 0.1 , σ UTS ) of the material at room temperature. Moreover, earlier [16] we showed that a longer preliminary MA is accompanied by a monotonous increase in the values of microhardness in the Ni 3 Al samples after SPS. The microhardness measurements after annealing indicate that Ni 3 Al samples formed by SPS with preliminary MA are characterized by thermal stability up to 1200°С, which is 150°C higher than the SPS temperature.…”

Section: Resultsmentioning

confidence: 58%

Effect of Preliminary Treatment on Microstructure, Mechanical Properties and Fracture of Ni3Al Samples Synthesized by Spark Plasma Sintering

et al. 2021

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A comparative study of microstructure parameters and mechanical property characteristics of consolidated Ni 3 Al samples formed by spark plasma sintering after a preliminary short-term mechanical activation and mixing in a mortar is carried out. It is found out that the grain size of the mechanically pre-activated material is several times smaller than that of the material sintered after mixing in a mortar. This feature is manifested in the differences in the values of microhardness and short-term strength. The annealing temperature effect on the structure parameters and mechanical properties of Ni 3 Al samples is revealed depending on the pretreatment. It is assumed that the formation of a high-defect structural state, characterized by fine grains combined with an increased level of microdistortions, during mechanical activation predetermines the strength properties of the material both after spark plasma sintering and after deformation and heat treatment.

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Section: Resultsmentioning

confidence: 58%