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RAS Energy, Mechanics & ControlИзвестия Российской академии наук. Механика твердого тела Mechanics of Solids

  • ISSN (Print) 1026-3519
  • ISSN (Online) 3034-6428

A model of diffusion annihilation of gas-filled spherical pores during hot isostatic pressing

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PII
S30346428S1026351925010071-1
DOI
10.7868/S3034642825010071
Publication type
Article
Status
Published
Authors
A. I. Epishin
  • Affiliation: Merzhanov Institute of Structural Macrokinetics and Materials Science of the RAS
D. S. Lisovenko
  • Affiliation: Ishlinsky Institute for Problems in Mechanics of the RAS
M. I. Alymov
  • Affiliation: Merzhanov Institute of Structural Macrokinetics and Materials Science of the RAS
Volume/ Edition
Volume / Issue number 1
Pages
136-157
Abstract
A diffusion model of dissolution of gas-filled spherical pores in a solid during hot isostatic pressing (HIP) is proposed. It is assumed that the pore surface emits vacancies when a solid is loaded with external pressure, as a result of which the pores shrink in size. Two specific cases are considered: pores with a constant amount of insoluble gas and pores with a gas diffusively dissolving in the material surrounding the pore. In the first case, the increasing internal pressure of the gas in the pore first slows down the process of pore contraction and finally stops it completely when the internal pressure of the gas in the pore becomes equal to the sum of the externally applied HIP pressure and the Laplace pressure due to the pore surface tension. In the second case, the internal gas pressure in the pore decreases rapidly due to the dissolution of the gas in the material surrounding the pore and therefore pore contraction does not stop. When the pore reaches a sub-micron size, the pore contraction is quickly accelerated due to the increasing Laplace pressure and finally the pore annihilates.
Keywords
газонаполненные поры горячее изостатическое прессование диффузия вакансии монокристаллы никелевых жаропрочных сплавов
Date of publication
20.01.2026
Year of publication
2026
Number of purchasers
0
Views
19

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