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Galtrey, M.J.; Oliver, R.A.; Kappers, M.J.; McAleese, C.; Zhu, D.; Humphreys, C.J.; Clifton, P.H.; Larsen, D.; Cerezo, A. |
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Publication |
Atom probe revels the structure of InxGe1-xN based quantum wells in three dimensions |
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Journal Article |
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2008 |
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Abstract |
Physica Status Solidi B-Basic Solid State Physics |
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Phys. Status Solidi B-Basic Solid State Phys. |
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245 |
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5 |
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Summary Language |
861-867 |
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Abbreviated Series Title |
The three-dimensional atom probe has been used to characterize InxGa1-xN based multiple quantum well structures emitting from the green to the ultra-violet with sub-nanometre resolution over a 100 nm field of view. The results show gross discontinuities and compositional variations within the UV-emitting quantum well layers on a 20-100 nm length scale. We propose that these may contribute to the high efficiency of this structure: In addition, the analysis shows the presence of indium in the barrier layers of all the samples, whether or not there was an indium precursor present during barrier growth. The distribution of indium within the blue- and green-emitting InxGa1-xN quantum wells is also analyzed, and we find no evidence that InxGa1-xN with a range of compositions is not a random alloy, and so rule out indium clustering as the cause of the reported carrier localization in these structures. The upper interface of each quantum well layer is shown to be rougher and more diffuse than the lower. and the existence of monolayer steps in the interfaces that could effectively localize carriers at room temperature is revealed. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
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Series Issue |
Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England, Email: mjg73@cam.ac.uk |
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Wiley-V C H Verlag Gmbh |
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0370-1972 |
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ISI:000256242300017 |
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NU @ m-krug @ |
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10392 |
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Lee, H. S.; Han, S. Z.; Lee, H. M.; Lee, Z. H. |
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Coarsening Behavior of L1$_2$ Precipitates in Melt-Spun Al-Ti-V-Zr Alloys |
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Journal Article |
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1993 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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163 |
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1 |
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81-90 |
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volume fraction
high-strength
kinetics
dependence
nucleation
growth
do22 |
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Aging studies of two melt-spun Al-2at.% (Ti,V,Zr) alloys showed that the would-be metastable L1(2) Al3(Ti,V,Zr) precipitates did not transform to stable D0(23) ones, and the average radius is 5-7 nm and the interparticle spacing is 20-40 nm at 698 K up to 400 h. The coarsening rate of spherical Al3(Ti0.2V0.4Zr0.4) precipitates was observed to be five times as fast as that of Al3(Ti0.1V0.4Zr0.5) precipitates. The coarsening behavior in both alloys obeyed the Lifshitz-Slyozov-Wagner (LSW) prediction well. Owing to the low coarsening rate and the high thermal stability of the precipitated phase, Al-Ti-V-Zr systems show promise as bases for high-temperature high-strength Al alloys. |
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Times Cited: 10
Article
English
Cited References Count: 44
Lf639 |
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refbase @ user |
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1328 |
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Lee, J. K.; Barnett, D. M.; Aaronson, H. I. |
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Elastic Strain-Energy of Coherent Ellipsoidal Precipitates in Anisotropic Crystalline Solids |
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Journal Article |
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1977 |
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Metallurgical Transactions a-Physical Metallurgy and Materials Science |
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6 |
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963-970 |
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Michigan Technol Univ,Dept Met Engn,Houghton,Mi 49931
Stanford Univ,Dept Mat Sci & Engn,Stanford,Ca 94305 |
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Times Cited: 115
Article
English
Cited References Count: 25
Dk346 |
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refbase @ user |
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1329 |
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Lee, K. M.; Moon, I. H. |
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High Temperature Deformation Behavior of Mechanically Alloyed Al-Ti Alloys |
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Journal Article |
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1992 |
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Scripta Metallurgica et Materialia |
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Scripta Metall. Mater. |
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26 |
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1 |
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123-126 |
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stress
flow |
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Lee, K. M.
Hanyang Univ,Dept Mat Engn,Seoul 133791,South Korea |
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Times Cited: 13
Article
English
Cited References Count: 12
Gw665 |
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refbase @ user |
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1333 |
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LeGoues, F. K.; Aaronson, H. I.; Lee, Y. W. |
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Influence of Crystallography Upon Critical Nucleus Shapes and Kinetics of Homogeneous FCC-FCC Nucleation--Part III. The Influence of Elastic Strain-Energy |
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Journal Article |
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1984 |
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Acta Metallurgica |
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32 |
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10 |
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1845-1853 |
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Carnegie Mellon Univ,Dept Met Engn & Mat Sci,Pittsburgh,Pa 15213 |
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Times Cited: 15
Article
English
Cited References Count: 24
Ts010 |
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refbase @ user |
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1338 |
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Lee, H. M.; Lee, J.; Lee, Z. H. |
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Lattice Misfit Variation of Al$_3$(Ti,V,Zr) in Al-Ti-V-Zr Alloys |
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Journal Article |
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1991 |
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Scripta Metallurgica et Materialia |
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Scripta Metall. Mater. |
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25 |
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517-520 |
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coarsening behavior
precipitation |
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Times Cited: 18
Article
English
Cited References Count: 18
Ez877 |
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refbase @ user |
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1327 |
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LeGoues, F. K.; Lee, Y. W.; Aaronson, H. I. |
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Influence of Crystallography Upon Critical Nucleus Shapes and Kinetics of Homogeneous FCC-FCC Nucleation--Part II. The Non-Classical Regime |
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Journal Article |
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1984 |
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Acta Metallurgica |
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32 |
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10 |
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1837-1843 |
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Carnegie Mellon Univ,Dept Met Engn & Mat Sci,Pittsburgh,Pa 15213 |
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Times Cited: 22
Article
English
Cited References Count: 8
Ts010 |
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refbase @ user |
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1340 |
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Lee, H. M. |
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Design of High-Temperature High-Strength Al-Ti-V-Zr Alloys |
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Journal Article |
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1990 |
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Scripta Metallurgica et Materialia |
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Scripta Metall. Mater. |
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24 |
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12 |
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2443-2446 |
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Times Cited: 23
Article
English
Cited References Count: 21
El505 |
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refbase @ user |
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1324 |
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Kim, B. J.; Moon, K. I.; Lee, K. S. |
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The Effect of the Third-Element Addition on the Fatigue Properties of Mechanically Alloyed Al-Ti Alloys |
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Journal Article |
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1999 |
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Journal of Alloys and Compounds |
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292 |
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1-2 |
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174-180 |
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al-ti alloys
al-ti-x (x=b, v, zr, ce) alloys
fatigue properties
mechanical alloying
lattice-parameters |
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AI-Ti-X (X=B, V, Zr, Ce) alloys were prepared by mechanical alloying and their fatigue properties were examined at room temperature, 300 degrees C and 400 degrees C. MA Al-Ti alloys showed fatigue strengths competitive with those of conventional precipitation hardened Al alloys (Al 7075, Al 2024) and the addition of third elements further improved the fatigue strength of MA alloys. As the temperature was increased to 300 degrees C and 400 degrees C, a decrease in fatigue strength was observed but the general trend in fatigue properties was the same as that at room temperature. The fatigue strength of AI-TI-X alloys, except for the Ce-added alloy, was enhanced compared with AI-Ti alloy because the third element addition reduced the lattice mismatch between Al and AI,Ti effectively and thus maintained the fine particle size of dispersoids. AI-Ti-X alloy showed the smallest precipitate size and the best room and high temperature fatigue strengths. The fatigue ratio of MA Al-Ti alloys was about 0.4 and improved slightly with temperature. The fracture mode of MA Al-Ti alloys was thought to be intergranular failures, in some cases involving also the interface between the matrix and the dispersoids. (C) 1999 Elsevier Science S.A. All rights reserved. |
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Moon, K. I.
Hanyang Univ, Dept Met Engn, Seoul 133791, South Korea
Hanyang Univ, Dept Met Engn, Seoul 133791, South Korea |
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Times Cited: 3
Article
English
Cited References Count: 17
253md |
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refbase @ user |
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1279 |
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Han, S. Z.; Rho, B. S.; Lee, H. M.; Choi, S. K. |
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Effect of Alloyed Ti:Zr ratio on Phase Stability of Al$_{66}$Mn$_9$(Ti,Zr)$_{25}$ Intermetallic Compounds |
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Journal Article |
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1996 |
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Intermetallics |
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4 |
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3 |
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245-249 |
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hardness
phase stability
compositional variation effects
zirconium trialuminides
l12 compounds
cubic phases
al3ti
deformation
behavior
do22
al66ti25mn9
strength
systems |
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The tetragonal Al-3(Ti1-xZrx) phase is transformed by the addition of 9% Mn to the cubic L1(2)-type Al66Mn9(Ti1-xZrx)(25) with a small amount of second phases such as Al8Mn5 and Al2Zr still existing in the as-cast condition. Second phases disappear when intermetallic compounds are homogenized at 1000 degrees C for 24 h, and alloys are of the monolithic L1(2) phase with compositional variations still existent. The combined addition of Ti and Zr is found to reduce the hardness of intermetallic alloys compared to the addition of Ti or Zr alone. The Al66Mn9(Ti, Zr)(25) phase is found to be structurally stable but compositionally unstable. |
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Korea Adv Inst Sci & Technol,Dept Mat Sci & Engn,Taejon 305701,South Korea |
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Times Cited: 3
Article
English
Cited References Count: 22
Tx119 |
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refbase @ user |
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1171 |
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