Journal
ACTA MATERIALIA
Volume 59, Issue 18, Pages 7051-7059Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.07.060
Keywords
Nanovoid nucleation; Ductile fracture; Phase transformation; Continuum mechanics model; Nucleation
Funding
- National Science Foundation [CBET-0755236, CMMI-0969143]
- Army Research Office [W911NF-09-1-0001]
- Iowa State University
- Texas Tech University
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1104518] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0969143] Funding Source: National Science Foundation
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Continuum thermodynamic and kinetic approaches to nanovoid nucleation as a fracture process inside elastoplastic material are developed. They include solutions to such conceptual problems as determination of the thermodynamic driving force and activation energy, and determination of the kinetic relationship between tensile fracture pressure and temperature. A kinetic pressure-temperature diagram for nanovoid nucleation is determined which, in addition to fracture, includes alternative mechanisms related to phase transformations. Fracture occurs below the kinetic melting temperature, sublimation takes place at high temperature and evaporation occurs in the intermediate range. Sublimation via virtual melting competes with fracture and evaporation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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