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.
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
UR - http://www.scopus.com/inward/record.url?scp=1942531393&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1942531393&partnerID=8YFLogxK
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 -