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Title: Subgrain growth and low angle boundary mobility in aluminum crystals of orientation {l_brace}110{r_brace}<001>

Abstract

Single crystals of orientation {l_brace}110{r_brace}<001> of a high purity Al-0.05% Si single-phase aluminum alloy have been deformed in channel die plane strain compression at room temperature and 350 C. The specimens were annealed at temperatures between 250 and 400 C and detailed measurements have been made of the extensive subgrain growth which occurs in these crystals. It was found that subgrain growth tended to be discontinuous, confirming earlier experimental and theoretical work, and showing that subgrain growth is quite different from normal grain growth. The mean misorientation between subgrains decreased during annealing and this was shown to have a strong effect on the kinetics of subgrain growth. The mobilities of low angle boundaries (2.6{degree} < {theta} < 5.6{degree}) at temperatures between 250 and 400 C were determined from the subgrain growth kinetics and the activation energies for migration found to be consistent with control by lattice diffusion of solute. The boundary mobilities were found to increase rapidly with increasing misorientation and the results have been compared with the predictions of current theories.

Authors:
;
Publication Date:
Research Org.:
Manchester Materials Science Center (GB)
OSTI Identifier:
20075951
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; GRAIN GROWTH; ALUMINIUM; MONOCRYSTALS; DEFORMATION; ANNEALING; GRAIN ORIENTATION; KINETICS; TEMPERATURE DEPENDENCE; MICROSCOPY

Citation Formats

Huang, Y., and Humphreys, F.J. Subgrain growth and low angle boundary mobility in aluminum crystals of orientation {l_brace}110{r_brace}<001>. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00418-8.
Huang, Y., & Humphreys, F.J. Subgrain growth and low angle boundary mobility in aluminum crystals of orientation {l_brace}110{r_brace}<001>. United States. doi:10.1016/S1359-6454(99)00418-8.
Huang, Y., and Humphreys, F.J. Thu . "Subgrain growth and low angle boundary mobility in aluminum crystals of orientation {l_brace}110{r_brace}<001>". United States. doi:10.1016/S1359-6454(99)00418-8.
@article{osti_20075951,
title = {Subgrain growth and low angle boundary mobility in aluminum crystals of orientation {l_brace}110{r_brace}<001>},
author = {Huang, Y. and Humphreys, F.J.},
abstractNote = {Single crystals of orientation {l_brace}110{r_brace}<001> of a high purity Al-0.05% Si single-phase aluminum alloy have been deformed in channel die plane strain compression at room temperature and 350 C. The specimens were annealed at temperatures between 250 and 400 C and detailed measurements have been made of the extensive subgrain growth which occurs in these crystals. It was found that subgrain growth tended to be discontinuous, confirming earlier experimental and theoretical work, and showing that subgrain growth is quite different from normal grain growth. The mean misorientation between subgrains decreased during annealing and this was shown to have a strong effect on the kinetics of subgrain growth. The mobilities of low angle boundaries (2.6{degree} < {theta} < 5.6{degree}) at temperatures between 250 and 400 C were determined from the subgrain growth kinetics and the activation energies for migration found to be consistent with control by lattice diffusion of solute. The boundary mobilities were found to increase rapidly with increasing misorientation and the results have been compared with the predictions of current theories.},
doi = {10.1016/S1359-6454(99)00418-8},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}