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Title: The effect of microstructure in the morphology and kinetics of amorphization induced by ion irradiation

Abstract

NiTi was irradiated with Ni ions to study the rate of amorphization as a function of temperature and to determine the temperature cutoff for the crystalline-to-amorphous transition. A series of irradiations was conducted at different temperatures from ambient to 350{degree}C. Prior to irradiation, the specimens contained martensitic plates and austenitic (B2) regions. However, during irradiation at temperatures of 80{degree}C and higher, all the specimens were entirely austenitic. As expected, amorphization was delayed as the irradiation temperature was increased. The fraction of material that became amorphous after irradiation at 250{degree}C to a dose of 0.7 dpa was estimated to be 5 to 10%. Specimens irradiated at higher temperatures remained crystalline, even after doses as high as 4 dpa. Irrespective of the irradiation temperature, we found a non-uniform distribution of amorphous regions that exhibited a morphology closely resembling the shape of the martensitic plates that existed in the material prior to heating it to the irradiation temperature. These observations are discussed in terms of the influence of structural defects on the kinetics of amorphization. 21 refs., 6 figs.

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
Sponsoring Org.:
DOE/ER
OSTI Identifier:
5182315
Report Number(s):
CONF-891119-65
ON: DE90005263; TRN: 90-003685
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society fall meeting, Boston, MA (USA), 27 Nov - 2 Dec 1989
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL ALLOYS; AMORPHOUS STATE; TITANIUM ALLOYS; DEFECTS; INTERMETALLIC COMPOUNDS; IRRADIATION; KINETICS; MICROSTRUCTURE; MORPHOLOGY; NICKEL IONS; ALLOYS; CHARGED PARTICLES; CRYSTAL STRUCTURE; IONS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Pedraza, D F, and Maziasz, P J. The effect of microstructure in the morphology and kinetics of amorphization induced by ion irradiation. United States: N. p., 1989. Web.
Pedraza, D F, & Maziasz, P J. The effect of microstructure in the morphology and kinetics of amorphization induced by ion irradiation. United States.
Pedraza, D F, and Maziasz, P J. Sun . "The effect of microstructure in the morphology and kinetics of amorphization induced by ion irradiation". United States. https://www.osti.gov/servlets/purl/5182315.
@article{osti_5182315,
title = {The effect of microstructure in the morphology and kinetics of amorphization induced by ion irradiation},
author = {Pedraza, D F and Maziasz, P J},
abstractNote = {NiTi was irradiated with Ni ions to study the rate of amorphization as a function of temperature and to determine the temperature cutoff for the crystalline-to-amorphous transition. A series of irradiations was conducted at different temperatures from ambient to 350{degree}C. Prior to irradiation, the specimens contained martensitic plates and austenitic (B2) regions. However, during irradiation at temperatures of 80{degree}C and higher, all the specimens were entirely austenitic. As expected, amorphization was delayed as the irradiation temperature was increased. The fraction of material that became amorphous after irradiation at 250{degree}C to a dose of 0.7 dpa was estimated to be 5 to 10%. Specimens irradiated at higher temperatures remained crystalline, even after doses as high as 4 dpa. Irrespective of the irradiation temperature, we found a non-uniform distribution of amorphous regions that exhibited a morphology closely resembling the shape of the martensitic plates that existed in the material prior to heating it to the irradiation temperature. These observations are discussed in terms of the influence of structural defects on the kinetics of amorphization. 21 refs., 6 figs.},
doi = {},
url = {https://www.osti.gov/biblio/5182315}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Conference:
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