The migration and coalescence of tritium-induced helium bubbles during creep in nickel

Grain boundary helium bubbles in Ni were found to act as effective creep cavity nuclei, but only after attaining critical size for growth by vacancy absorption. The growth of an initial population of subcritical bubbles took place by a migration and coalescence process involving bubble transport by...

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Veröffentlicht in:	Scr. Metall.; (United States) 1987-02, Vol.21 (2), p.191-196
Hauptverfasser:	Mintz, J.M., Sattler, M.L., Mukherjee, A.K.
Format:	Artikel
Sprache:	eng
Schlagworte:	360102 - Metals & Alloys- Structure & Phase Studies 360103 - Metals & Alloys- Mechanical Properties 360105 - Metals & Alloys- Corrosion & Erosion 70 PLASMA PHYSICS AND FUSION TECHNOLOGY 700209 - Fusion Power Plant Technology- Component Development & Materials Testing ABSORPTION ALLOYS Applied sciences BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES BUBBLE GROWTH BUBBLES CHROMIUM ALLOYS Condensed matter: structure, mechanical and thermal properties CORROSION RESISTANT ALLOYS CREEP Cross-disciplinary physics: materials science rheology CRYSTAL DEFECTS CRYSTAL STRUCTURE DUCTILITY ELEMENTS EMBRITTLEMENT Exact sciences and technology FLUIDS GASES GRAIN BOUNDARIES HELIUM HELIUM EMBRITTLEMENT HYDROGEN ISOTOPES IRON ALLOYS IRON BASE ALLOYS ISOTOPES LIGHT NUCLEI MATERIALS MATERIALS SCIENCE Mechanical and acoustical properties of condensed matter MECHANICAL PROPERTIES Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Mechanical properties of solids METALS Metals, semimetals and alloys Metals. Metallurgy MICROSTRUCTURE NICKEL NONMETALS NUCLEATION NUCLEI ODD-EVEN NUCLEI Physics POINT DEFECTS RADIOISOTOPES RARE GASES Specific materials STAINLESS STEELS STEELS TEMPERATURE EFFECTS TENSILE PROPERTIES THERMONUCLEAR REACTOR MATERIALS TRANSITION ELEMENTS TRITIUM VACANCIES YEARS LIVING RADIOISOTOPES
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Zusammenfassung:	Grain boundary helium bubbles in Ni were found to act as effective creep cavity nuclei, but only after attaining critical size for growth by vacancy absorption. The growth of an initial population of subcritical bubbles took place by a migration and coalescence process involving bubble transport by moving grain boundary dislocations as accurately modeled by Beere. Attainment of a stable distribution of critical bubble/cavities was rapid, however, being effectively complete by the end of primary creep. 5 ref.--AA
ISSN:	0036-9748
DOI:	10.1016/0036-9748(87)90433-9