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Title: Deformation parameters governing tensile elongation for a mechanically milled Al-1.1at.% Mg-1.2at.% Cu alloy tested in tension at constant true strain rates

Abstract

For a mechanically milled Al-1.1at.%Mg-1.2at.%Cu alloy, tensile deformation was carried out at temperatures of 523--823 K and at true strain rates of 1 x 10{sup {minus}}3-5 x 10{sup 0}/s. The analysis of true stress-true strain curves from a dislocation dynamics viewpoint showed that a large value of re-mobilization probability of unlocked immobile dislocations {Omega} is mainly responsible for an enormous elongation (1.3 in true strain) observed at an intermediate strain rate (10{sup o}/s) and temperature (748 K). Discussion on thermally activated process for {Omega} and dislocation kinetics indicated that the suppression of plastic instability leading to superplastic elongation is controlled by liberating immobile dislocations from a solute atmosphere. The strain rate sensitivity m was formulated on a basis of dislocation dynamics, and a relation of {Omega}{proportional_to}m{sup 2} was found to hold between them.

Authors:
; ;
Publication Date:
Research Org.:
Tokyo Univ. of Agriculture and Technology (JP)
OSTI Identifier:
20075934
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TENSILE PROPERTIES; ALUMINIUM BASE ALLOYS; MAGNESIUM ALLOYS; COPPER ALLOYS; COMPUTERIZED SIMULATION; TEMPERATURE RANGE 0400-1000 K; STRAIN RATE; DEFORMATION; DISLOCATIONS; MATHEMATICAL MODELS

Citation Formats

Hasegawa, T., Takahashi, T., and Okazaki, K. Deformation parameters governing tensile elongation for a mechanically milled Al-1.1at.% Mg-1.2at.% Cu alloy tested in tension at constant true strain rates. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(00)00005-7.
Hasegawa, T., Takahashi, T., & Okazaki, K. Deformation parameters governing tensile elongation for a mechanically milled Al-1.1at.% Mg-1.2at.% Cu alloy tested in tension at constant true strain rates. United States. doi:10.1016/S1359-6454(00)00005-7.
Hasegawa, T., Takahashi, T., and Okazaki, K. Thu . "Deformation parameters governing tensile elongation for a mechanically milled Al-1.1at.% Mg-1.2at.% Cu alloy tested in tension at constant true strain rates". United States. doi:10.1016/S1359-6454(00)00005-7.
@article{osti_20075934,
title = {Deformation parameters governing tensile elongation for a mechanically milled Al-1.1at.% Mg-1.2at.% Cu alloy tested in tension at constant true strain rates},
author = {Hasegawa, T. and Takahashi, T. and Okazaki, K.},
abstractNote = {For a mechanically milled Al-1.1at.%Mg-1.2at.%Cu alloy, tensile deformation was carried out at temperatures of 523--823 K and at true strain rates of 1 x 10{sup {minus}}3-5 x 10{sup 0}/s. The analysis of true stress-true strain curves from a dislocation dynamics viewpoint showed that a large value of re-mobilization probability of unlocked immobile dislocations {Omega} is mainly responsible for an enormous elongation (1.3 in true strain) observed at an intermediate strain rate (10{sup o}/s) and temperature (748 K). Discussion on thermally activated process for {Omega} and dislocation kinetics indicated that the suppression of plastic instability leading to superplastic elongation is controlled by liberating immobile dislocations from a solute atmosphere. The strain rate sensitivity m was formulated on a basis of dislocation dynamics, and a relation of {Omega}{proportional_to}m{sup 2} was found to hold between them.},
doi = {10.1016/S1359-6454(00)00005-7},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}