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Sha, Gang; Ringer, Simon P.; Duan, Zhi Chao; Langdon, Terence G. |
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An atom probe characterisation of grain boundaries in an aluminium alloy processed by equal-channel angular pressing |
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Journal Article |
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2009 |
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International Journal of Materials Research |
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2009 |
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12 |
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1674-1678 |
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Abbreviated Series Title |
The segregation of solute elements at the grain boundaries of an Al–Zn–Mg–Cu alloy processed by equal-channel angular pressing was characterised using three-dimensional atom probe tomography. The results show that Mg and Cu segregate strongly to the grain boundaries but Zn shows no clear segregation and even becomes depleted near the boundaries. Trace elements such as Zr, Cr, Si and Mn show no clear segregation at the grain boundaries. An increase in the number of passes leads to a decrease in the grain size but there is no clear effect on the levels of solute segregation at the boundaries. The significant segregation of certain major alloying element at the boundaries of ultrafine-grained alloys implies that the less super-saturation solutes in the matrix will be available for precipitation with a decrease in the average grain size. |
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NU @ karnesky @ |
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10772 |
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Wadman, B.; Andren, H. O. |
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Direct measurement of matrix composition in zircaloy-4 |
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Journal Article |
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1989 |
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Proc 8th Intl Symp Zirconium Nucl Inc ASTM STP |
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1023 |
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Atom Probe Field Ion Microscopy |
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4766 |
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Zhang, Guo Fan; Sauvage, Xavier; Wang, Jing Tao; Gao, Nong; Langdon, Terence G. |
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Decomposition of Nanostructured Martensite in Cu-Al Alloys Processed by High-Pressure Torsion |
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Journal Article |
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2010 |
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Materials Science Forum |
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667-669 |
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469-474 |
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The phase decomposition was investigated in Cu-Al alloys processed to a nanostructure condition by High Pressure Torsion (HPT). The microstructures are characterized by optical microscopy (OM), X-ray diffraction (XRD) and Atom Probe Tomography (APT). The results show that the’ → (1 + decomposition reaction begins in the early stage of annealing and it is much faster than in the coarse-grained state although there are similar phases after annealing. |
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1662-9752 |
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NU @ karnesky @ zhang_decomposition_2010 |
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11324 |
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Venkateswarlu, K.; Rajinikanth, V.; Ray, Ajoy Kumar; Xu, Cheng; Langdon, Terence G. |
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The characteristics of aluminum-scandium alloys processed by ECAP |
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Journal Article |
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2010 |
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Materials Science and Engineering: A |
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527 |
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6 |
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1448-1452 |
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Aluminum alloys; Equal-channel angular pressing; Scandium; Tensile testing; Ultrafine grains |
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Aluminum-scandium alloys were prepared having different scandium additions of 0.2, 1.0 and 2.0wt.% and these alloys were processed by equal-channel angular pressing (ECAP) at 473K. The results show the grain refinement of the aluminum matrix and the morphology of the Al3Sc precipitates depends strongly on the scandium concentration. The tensile properties were evaluated after ECAP by pulling to failure at initial strain rates from 1.010-3 to 1.010-1s-1. The Al-1% Sc alloy exhibited the highest tensile strength of ~250MPa at a strain rate of 1.010-1s-1. This alloy also exhibited a superior grain refinement of ~0.4[mu]m after ECAP where this is attributed to a smaller initial grain size and an optimum volume fraction of dispersed Al3Sc precipitates having both micrometer and nanometer sizes. |
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0921-5093 |
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NU @ karnesky @ |
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10711 |
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Meng, Gang; Li, Bolong; Li, Hongmei; Huang, Hui; Nie, Zuoren |
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Hot deformation and processing maps of an Al-5.7 wt.%Mg alloy with erbium |
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Journal Article |
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2009 |
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Materials Science and Engineering: A |
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517 |
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1-2 |
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132-137 |
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Hot deformation; Processing maps; Kinetic analysis; Al-Mg alloy; Rare earth erbium |
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The hot deformation behavior of an Al-5.7 wt.%Mg alloy with erbium has been investigated. Compression tests are performed in the temperature range of 300-500 °C and in the strain rate ranging from 0.001 s-1 to 50 s-1 up to a true strain of 0.7. The processing maps are developed at different strains and the standard kinetic analysis has been applied to evaluate the rate controlling mechanisms. The processing maps have exhibited two domains of 350-450 °C at 0.001-0.03 s-1 and 450-500 °C at 0.01-1 s-1, representing dynamic recovery of Al-5.7 wt.%Mg with erbium. The apparent activation energies estimated in these two domains are 180 kJ/mol and 163 kJ/mol respectively, which suggests that cross-slip of dislocation and lattice self-diffusion are the deformation mechanisms. At strain rates higher than 10 s-1, the flow curves demonstrate flow softening behavior, and the flow instability regions reveal mixed microstructure of local deformation and dynamic recrystallization. |
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0921-5093 |
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NU @ karnesky @ |
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10600 |
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Gang, Meng; bolong, Li; hongmei, Li; hui, Huang; zuoren, Nie |
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Hot deformation behavior of an Al-5.7 wt.%Mg alloy with erbium |
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Journal Article |
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2009 |
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Materials Science and Engineering: A |
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516 |
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1-2 |
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131-137 |
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Aluminum alloy with erbium; Drv; Hot deformation; Microstructure; Zener-Hollomon parameter |
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The hot deformation behavior of an Al–5.7 wt.%Mg alloy with erbium was studied by compressive deformation tests in the strain rate range of 0.001–10 s−1 and temperature range of 300–500 °C. The constitutive equations were presented considering the values of A and β as a function of strain in the exponential function form. The error of predicted and measured data was less than 9%. Dynamic recrystallization was restrained by precipitate with Er and dynamic recovery dominated in the hot deformation. The mechanism of dynamic recovery was dislocation movement and the development of microstructure during deformation can be characterized by the Z parameter, and then the relationship between subgrains and deformation parameters have been also established. |
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0921-5093 |
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The hot deformation behavior of an Al-5.7�wt.%Mg alloy with erbium was studied by compressive deformation tests in the strain rate range of 0.001-10�s-1 and temperature range of 300-500��C. The constitutive equations were presented considering the values of A and [beta] as a function of strain in the exponential function form. The error of predicted and measured data was less than 9%. Dynamic recrystallization was restrained by precipitate with Er and dynamic recovery dominated in the hot deformation. The mechanism of dynamic recovery was dislocation movement and the development of microstructure during deformation can be characterized by the Z parameter, and then the relationship between subgrains and deformation parameters have been also established. |
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NU @ karnesky @ 18273 |
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10646 |
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Renaud, L.; Da Costa, G.; Bouet, M.; Deconihout, B. |
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Design of a fast multi-hit position sensitive detector based on a CCD camera |
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Journal Article |
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2002 |
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Nuclear Instruments and Methods in Physics Research |
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Nucl. Instrum. Methods Phys. Res. |
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A477 |
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150-154 |
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9141 |
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Rolander, W. U., G; Andren, H. O. |
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Interaction between nitrogen and substitutional elements in the austenitic phase of duplex austenitic-ferritic stainless steels |
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Journal Article |
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1989 |
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High Nitrogen Steels Proc Intl Conf Lille France 1988 Fock J and Hendry A eds Institute of Metals London |
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453 |
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Atom Probe Field Ion Microscopy |
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4768 |
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Vaumousse, D.; Cerezo, A.; Warren, P. J.; Court, S. A. |
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An atom probe study of fine scale structure in AlMgSi(Cu) alloys |
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Journal Article |
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2002 |
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Materials Science Forum |
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Mater. Sci. Forum |
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396-4 |
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693-698 |
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9180 |
| Permanent link to this record |
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Fujita, Takashi; Horita, Zenji; Langdon, Terence G. |
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Using grain boundary engineering to evaluate the diffusion characteristics in ultrafine-grained Al–Mg and Al–Zn alloys |
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Journal Article |
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2004 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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371 |
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1-2 |
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241-250 |
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Diffusion; Equal-channel angular pressing (ECAP); Grain boundary engineering; Interdiffusion |
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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. |
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NU @ karnesky @ |
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523 |
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