Effect of cascade remnants on freely migrating defects in Cu-1%Au alloys

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:477390

Iwase, A ^[1]; Rehn, L E; Baldo, P M; Funk, L ^[1]

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1. Argonne National Lab., IL (United States). Materials Science Div.

The effects of cascade remnants on Freely Migrating Defects (FMD) were studied by measuring Radiation-Induced Segregation (RIS) in Cu-1% Au at 400 C during simultaneous irradiation with 1.5-MeV He and (400--800)-keV heavy ions (Ne, Ar or Cu). The large RIS observed during 1.5-MeV He-only irradiation was dramatically suppressed under simultaneous heavy ion irradiation. For Cu simultaneous irradiation, the suppression disappeared immediately after the Cu irradiation ceased, while for simultaneous inert gas (Ne or Ar) irradiation, the suppression persisted after the ion beam was turned off. These results demonstrate that the displacement cascades created by heavy ions introduce additional annihilation sites, which reduce the steady-state FMD concentrations. As the cascade remnants produced by Cu ions are thermally unstable at 400 C, the RIS suppression occurs only during simultaneous irradiation. On the other hand, the inert gas atoms which accumulate in the specimen apparently stabilize the cascade remnants, allowing the suppression to persist.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 477390
• Report Number(s): CONF-951155--; ISBN 1-55899-299-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER BASE ALLOYS
CRYSTAL DEFECTS
EXPERIMENTAL DATA
GOLD ALLOYS
HEAVY IONS
HELIUM IONS
PHYSICAL RADIATION EFFECTS
SEGREGATION