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Title: Radiation-induced segregation and precipitation in molybdenum-rhenium alloys

Abstract

Specimens of Mo-7 at. % Re and Mo-30 at. % Re were irradiated with 1.8 MeV /sup 4/He/sup +/ ions at elevated temperatures. Radiation-induced segregation of Re was measured during irradiation by in situ Rutherford backscattering spectrometry. Segregation of the undersized Re atoms in the same direction as the defect fluxes, i.e., toward the external surface, was observed. The amount of Re enrichment in the near-surface region was measured as a function of temperature and of dose at a calculated near-surface displacement rate near 1 x 10/sup -4/dpa/s. Segregation was observed at temperatures from 800 to 1500/sup 0/C in Mo-7Re, and from 850 to 1225/sup 0/C in Mo-30Re. Irradiated disks were examined by transmission electron microscopy. Precipitates of Chi phase were observed on grain boundaries, or in a thin layer at the irradiated surface in Mo-30Re after irradiation at temperatures from 750 to 1075/sup 0/C. Frequently, Chi precipitates formed with a crystallographic twin orientation with respect to the host matrix. No voids were observed for doses up to 1.6 dpa.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA); Illinois Univ., Urbana (USA). Dept. of Metallurgy and Mining Engineering
OSTI Identifier:
5831801
Report Number(s):
CONF-860605-6
ON: DE86007521
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
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
Subject:
36 MATERIALS SCIENCE; MOLYBDENUM ALLOYS; PHYSICAL RADIATION EFFECTS; RHENIUM ALLOYS; HELIUM IONS; MEV RANGE 01-10; MICROSTRUCTURE; SEGREGATION; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CHARGED PARTICLES; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; ENERGY RANGE; IONS; MEV RANGE; MICROSCOPY; RADIATION EFFECTS; 360106* - Metals & Alloys- Radiation Effects

Citation Formats

Erck, R A, Wayman, C M, and Rehn, L E. Radiation-induced segregation and precipitation in molybdenum-rhenium alloys. United States: N. p., 1986. Web.
Erck, R A, Wayman, C M, & Rehn, L E. Radiation-induced segregation and precipitation in molybdenum-rhenium alloys. United States.
Erck, R A, Wayman, C M, and Rehn, L E. 1986. "Radiation-induced segregation and precipitation in molybdenum-rhenium alloys". United States. https://www.osti.gov/servlets/purl/5831801.
@article{osti_5831801,
title = {Radiation-induced segregation and precipitation in molybdenum-rhenium alloys},
author = {Erck, R A and Wayman, C M and Rehn, L E},
abstractNote = {Specimens of Mo-7 at. % Re and Mo-30 at. % Re were irradiated with 1.8 MeV /sup 4/He/sup +/ ions at elevated temperatures. Radiation-induced segregation of Re was measured during irradiation by in situ Rutherford backscattering spectrometry. Segregation of the undersized Re atoms in the same direction as the defect fluxes, i.e., toward the external surface, was observed. The amount of Re enrichment in the near-surface region was measured as a function of temperature and of dose at a calculated near-surface displacement rate near 1 x 10/sup -4/dpa/s. Segregation was observed at temperatures from 800 to 1500/sup 0/C in Mo-7Re, and from 850 to 1225/sup 0/C in Mo-30Re. Irradiated disks were examined by transmission electron microscopy. Precipitates of Chi phase were observed on grain boundaries, or in a thin layer at the irradiated surface in Mo-30Re after irradiation at temperatures from 750 to 1075/sup 0/C. Frequently, Chi precipitates formed with a crystallographic twin orientation with respect to the host matrix. No voids were observed for doses up to 1.6 dpa.},
doi = {},
url = {https://www.osti.gov/biblio/5831801}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Feb 01 00:00:00 EST 1986},
month = {Sat Feb 01 00:00:00 EST 1986}
}

Conference:
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