Defects interaction processes in deformed high purity polycrystalline molybdenum at elevated temperatures

Authors
Lambri, Osvaldo Agustin F.; Bonifacich, Federico Guillermo; Bozzano, Patricia Beatriz; Zelada, Griselda Irene; Plazaola, F; García, J.A.
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
Mechanical spectroscopy (damping and elastic modulus as a function of temperature) and transmission electron microscopy studies have been performed in high purity polycrystalline molybdenum plastically deformed to different values of tensile and torsion strain. Mechanical spectroscopy measurements were performed from room temperature up to 1285 K. A relaxation peak in polycrystalline molybdenum related to the movement of dislocations into lower energy configurations near grain boundaries has been discovered to appear around 1170 K. The activation energy of the peak is 4.2 eV ± 0.5 eV. This relaxation phenomenon involves the interaction between vacancies and mobile dislocations near the grain boundaries. It should be highlighted that this relaxation process is controlled by the arrangement of vacancies and dislocations which occur at temperature below 1070 K
Fil: Lambri, Osvaldo Agustin F.. Universidad Nacional de Rosario. Facultad de Cs.exactas Ingeniería y Agrimensura. No Declara. Laboratorio de Materiales Ceramicos; Argentina
Fil: Bonifacich, Federico Guillermo. Universidad Nacional de Rosario. Facultad de Cs.exactas Ingeniería y Agrimensura. No Declara. Laboratorio de Materiales Ceramicos; Argentina
Fil: Bozzano, Patricia Beatriz. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
Fil: Zelada, Griselda Irene. Universidad Nacional de Rosario. Facultad de Cs.exactas Ingeniería y Agrimensura. No Declara. Laboratorio de Materiales Ceramicos; Argentina
Fil: Plazaola, F. Universidad del País Vasco; España
Fil: García, J.A.. Universidad del País Vasco; España
Subject
MOLYBDENUM
GRAIN BOUNDARY DISLOCATION MOBILITY
VACANCIES
MECHANICAL SPECTROSCOPY
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/30248