The role of melting temperature and electron-phonon coupling in the formation of clustered vacancy defects from heavy ion generated displacement cascades in Cu-Ni alloys

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90370-8· OSTI ID:6612837

Tappin, D K; Robertson, I M; Smalinskas, K ^[1]; Kirk, M A ^[2]

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1. Univ. of Illinois, Urbana (United States)
2. Argonne National Lab., IL (United States)

Displacement cascades are a fundamental aspect of the damage produced by fast neutron or heavy ion irradiation of metals. Recent molecular dynamic simulations of the evolution of the displacement cascade suggest that the energy deposited within the cascade region may be sufficient to induce a liquid-like state. The lifetime of this so called thermal spike phase appears to significantly affect the probability of a displacement cascade producing a vacancy type dislocation loop. Long thermal spike lifetimes are thought to increase the probability for vacancy loop formation. The present work examines the influence of the melting point and electron-phonon coupling on the probability for loop formation in a series of Cu-Ni alloys. The alloys investigated exhibit complete solid solubility across the full composition range and the constituent elements are of similar mass, reducing the influence of collisional factors on the observed microstructure. The method of Flynn and Averback has been used to calculate the degree of electron-phonon coupling.

• DOE Contract Number: FG02-91ER45439; W-31109-ENG-38
• OSTI ID: 6612837
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 28:7; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER BASE ALLOYS
PHYSICAL RADIATION EFFECTS
NICKEL ALLOYS
ELECTRON-PHONON COUPLING
HEAVY IONS
IRRADIATION
MATHEMATICAL MODELS
MELTING
VACANCIES
ALLOYS
CHARGED PARTICLES
COPPER ALLOYS
COUPLING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
IONS
PHASE TRANSFORMATIONS
POINT DEFECTS
RADIATION EFFECTS
360106* - Metals & Alloys- Radiation Effects