TY - JOUR
T1 - Using grain boundary engineering to evaluate the diffusion characteristics in ultrafine-grained Al-Mg and Al-Zn alloys
AU - Fujita, Takashi
AU - Horita, Zenji
AU - Langdon, Terence G.
N1 - Funding Information:
We thank Mr. Takayoshi Fujinami for experimental assistance. One of us (T.F.) is grateful to the Japan Society for the Promotion of Science for the award of a Research Fellowship for Young Scientists. This study was supported in part by the Japan Aluminum Association, in part by the Light Metals Educational Foundation of Japan, in part by the US Army Research Office under Grant No. DAAD19-00-1-0488 and in part by the National Science Foundation of the United States under Grant No. DMR-0243331.
PY - 2004/4/25
Y1 - 2004/4/25
N2 - Samples of dilute Al-Mg and Al-Zn alloys, containing a minor Sc addition, were processed by equal-channel angular pressing (ECAP) to achieve grain refinement and different distributions of the grain boundary misorientations. Diffusion experiments were conducted on fine-grained alloys with either low or high fractions of grain boundaries having high-angle misorientations and on unpressed coarse-grained samples. The diffusion couples were annealed at temperatures from 493 to 848 K and the interdiffusion coefficients were determined from the concentration profiles using the Boltzmann-Matano technique. The results show the interdiffusion coefficients tend to be higher in fine-grained alloys having high fractions of high-angle boundaries than in fine-grained alloys having high fractions of low-angle boundaries. The experimental data are used to estimate values for the grain boundary diffusion coefficients.
AB - Samples of dilute Al-Mg and Al-Zn alloys, containing a minor Sc addition, were processed by equal-channel angular pressing (ECAP) to achieve grain refinement and different distributions of the grain boundary misorientations. Diffusion experiments were conducted on fine-grained alloys with either low or high fractions of grain boundaries having high-angle misorientations and on unpressed coarse-grained samples. The diffusion couples were annealed at temperatures from 493 to 848 K and the interdiffusion coefficients were determined from the concentration profiles using the Boltzmann-Matano technique. The results show the interdiffusion coefficients tend to be higher in fine-grained alloys having high fractions of high-angle boundaries than in fine-grained alloys having high fractions of low-angle boundaries. The experimental data are used to estimate values for the grain boundary diffusion coefficients.
KW - Diffusion
KW - Equal-channel angular pressing (ECAP)
KW - Grain boundary engineering
KW - Interdiffusion
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U2 - 10.1016/j.msea.2003.12.042
DO - 10.1016/j.msea.2003.12.042
M3 - Article
AN - SCOPUS:1942531393
VL - 371
SP - 241
EP - 250
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -