Radiation-induced segregation in light-ion bombarded Ni-8% Si

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5831700

Packan, N H; Heatherly, L; Kesternich, W; Schroeder, H

Tensile specimens 60 ..mu..m thick of Ni-8 at. % Si have been bombarded at 475/sup 0/C to doses of 0.1 to 0.3 dpa with either 7 MeV proton or 28 MeV alpha particle beams. Deliberate embrittlement by high temperature (700/sup 0/C) preimplantation of helium was required to produce intergranular fracture. Depth profile sputtering and analysis in a Scanning Auger Microprobe was then used to study radiation-induced segregation of silicon both at the external surfaces and at internal interfaces. The external surfaces exhibited a strongly silicon-enriched zone for the first 10 to 20 nm followed by a broad (approx.200 nm), shallow silicon-depleted region. Segregation of silicon to grain boundaries varied from interface to interface and possibly from region to region on a given interface. In general, however, depth profiles of silicon content with distance from internal boundaries showed no noticeable depletion zone and a more gradual fall-off compared to the profiles from external surfaces. The variations of RIS among boundaries and with type of interface probably reflect, at least in part, intrinsic differences in sink efficiency.

• Research Organization: Oak Ridge National Lab., TN (USA); Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Festkoerperforschung
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5831700
• Report Number(s): CONF-860605-13; ON: DE86009155
• Resource Relation: Conference: 13. international symposium on the effects of radiation on materials, Seattle, WA, USA, 23 Jun 1986; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
PHYSICAL RADIATION EFFECTS
SILICON ALLOYS
ALPHA PARTICLES
FRACTURES
MEV RANGE
PROTONS
SEGREGATION
ALLOYS
BARYONS
CHARGED PARTICLES
ELEMENTARY PARTICLES
ENERGY RANGE
FAILURES
FERMIONS
HADRONS
NICKEL ALLOYS
NUCLEONS
RADIATION EFFECTS
360106* - Metals & Alloys- Radiation Effects