Revealing the Void Formation Mechanism during Superplastic Deformation of a Fine-Grained Ni-Co-Base Superalloy

doi:10.1007/s40195-024-01670-8

Abstract

Abstract:

The mechanism behind void formation during superplasticity remains a subject of uncertainty. This study presented a novel insight into the void formation in a fine-grained Ni-Co-based superalloy during superplasticity. It was observed that the dissolution of γ′-particles resulted in the creation of vacancies due to differences in atomic size between the matrix and the particles. These vacancies acted as inclusions, leading to the formation of micro-voids. Notably, excessive void formation correlated with higher particle dissolution was experimentally observed, highlighting a direct relationship between void formation and particle dissolution.

Key words: Superplasticity, Void formation, Ni-Co-based superalloy, Microstructure

Rashad A. Al-Hammadi, Rui Zhang, Chuanyong Cui, Zijian Zhou, Yizhou Zhou. Revealing the Void Formation Mechanism during Superplastic Deformation of a Fine-Grained Ni-Co-Base Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(5): 915-920.

Figures/Tables 4

Fig. 1 Elongation as a function of a temperature, b strain rate; c m value at different deformation conditions

Fig. 2 OM images at the fracture point deformed at: a 900, b 1000, c 1100 °C and 0.001/s; d 0.1, e 0.01, f 0.001/s at 1050 °C

Fig. 3 Relationship between void fraction and: a and b elongation, c and d stress peak, e and f grain size, g, h volume fraction of γ′-particles

Fig. 4 A schematic illustrating the void formation during superplasticity of the Ni-Co-based superalloy

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