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Title: Effect of anodic oxide films on low temperature mechanical behavior of niobium single crystals

Abstract

The effect of thin (less than or equal to 1500 A) anodic oxide films on the mechanical behavior of single crystals of niobium at low temperatures (T less than or equal to 0.15 T/sub M/) was investigated. Oxide films affect mechanical behavior in two ways: the yield stress is reduced and the stress-strain curves are serrated over an appreciable range of strains. When oxide-coated specimens are also prestrained into stage I at 300$sup 0$K, the serrations observed at low temperatures disappear, the flow stress is further reduced, the ductility is increased, and a three-stage work hardening behavior occurs. A model involving generation and motion of nonscrew dislocations from the oxide-metal interface is used to explain the results. (auth)

Authors:
;
Publication Date:
Research Org.:
Case Western Reserve Univ., Cleveland, Ohio (USA). Dept. of Metallurgy and Materials Science
OSTI Identifier:
4114554
Report Number(s):
COO-1676-38; CONF-750999-1
NSA Number:
NSA-33-015261
DOE Contract Number:  
AT(11-1)-1676
Resource Type:
Conference
Resource Relation:
Conference: Meeting on surface effects in crystal plasticity, Hohegeiss, F.R. Germany, 5 Sep 1975; Other Information: Orig. Receipt Date: 30-JUN-76
Country of Publication:
United States
Language:
English
Subject:
N50230* -Metals, Ceramics, & Other Materials-Metals & Alloys-Properties, Structure & Phase Studies; 360103* -Materials-Metals & Alloys-Mechanical Properties; *NIOBIUM- MECHANICAL PROPERTIES; ANODIZATION; DISLOCATIONS; DUCTILITY; FILMS; FLOW STRESS; LOW TEMPERATURE; MONOCRYSTALS; STRAIN HARDENING

Citation Formats

Sethi, V. K., and Gibala, R.. Effect of anodic oxide films on low temperature mechanical behavior of niobium single crystals. United States: N. p., 1975. Web.
Sethi, V. K., & Gibala, R.. Effect of anodic oxide films on low temperature mechanical behavior of niobium single crystals. United States.
Sethi, V. K., and Gibala, R.. 1975. "Effect of anodic oxide films on low temperature mechanical behavior of niobium single crystals". United States. https://www.osti.gov/servlets/purl/4114554.
@article{osti_4114554,
title = {Effect of anodic oxide films on low temperature mechanical behavior of niobium single crystals},
author = {Sethi, V. K. and Gibala, R.},
abstractNote = {The effect of thin (less than or equal to 1500 A) anodic oxide films on the mechanical behavior of single crystals of niobium at low temperatures (T less than or equal to 0.15 T/sub M/) was investigated. Oxide films affect mechanical behavior in two ways: the yield stress is reduced and the stress-strain curves are serrated over an appreciable range of strains. When oxide-coated specimens are also prestrained into stage I at 300$sup 0$K, the serrations observed at low temperatures disappear, the flow stress is further reduced, the ductility is increased, and a three-stage work hardening behavior occurs. A model involving generation and motion of nonscrew dislocations from the oxide-metal interface is used to explain the results. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4114554}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1975},
month = {10}
}

Conference:
Other availability
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