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Vaumousse, D.; Cerezo, A.; Warren, P. J. |
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A procedure for quantification of precipitate microstructures from three-dimensional atom probe data |
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Journal Article |
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2003 |
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Ultramicroscopy |
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95 |
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215-221 |
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Precipitate quantification; Analytical software method; 3-D atom probe data |
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Abbreviated Series Title |
New analysis software for selecting and quantifying particles in three-dimensional atom maps has been designed. The selection of solute-rich regions is performed by connecting solute atoms which lie within a fixed distance (d), and taking clusters above a certain minimum number of solute atoms (Nmin). Other atoms within some distance L greater than d are taken to belong to the cluster. However, this results in the inclusion of a shell of matrix atoms, which must be removed through an erosion step, to define the final cluster. Data filtered in this way can be used for subsequent quantification of parameters such as size, shape, composition, number density and volume fraction with better accuracy than by manual selection. The choice of d, Nmin and L values is discussed and some methods of evaluation of these parameters are proposed. Examples are presented on the application of this new software to the analysis of early stage clustering in an Al–Mg–Si–Cu alloy and a copper-containing steel. |
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NU @ karnesky @ |
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96 |
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Nie, Zuoren; Jin, Tounan; Fu, Jingbou; Xu, Guefu; Yang, Junjun; Zhou, Jingxia; Zuo, Tieyong |
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Research on Rare Earth in Aluminum |
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Book Chapter |
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2002 |
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Aluminum Alloys 2002: Their Physical and Mechanical Properties |
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1731-1735 |
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Materials Science Forum |
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396-402 |
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NU @ karnesky @ |
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181 |
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Her, Tsing-Hua; Finlay, Richard J.; Wu, Claudia; Deliwala, Shrenik; Mazur, Eric |
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Microstructuring of silicon with femtosecond laser pulses |
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Journal Article |
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1998 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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73 |
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12 |
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1673-1675 |
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We report that silicon surfaces develop an array of sharp conical spikes when irradiated with 500 laser pulses of 100-fs duration, 10-kJ/m2 fluence in 500-Torr SF6 or Cl2. The spikes are up to 40-µm tall, and taper to about 1-µm diam at the tip. Irradiation of silicon surfaces in N2, Ne, or vacuum creates structured surfaces, but does not create sharp conical spikes |
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NU @ karnesky @ |
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188 |
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Kramer, Lawrence S.; Tack, William T.; Fernandes, Micky T. |
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Scandium in Aluminum Alloys |
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Journal Article |
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1997 |
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Advanced Materials & Processes |
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152 |
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23-24 |
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NU @ karnesky @ |
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205 |
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Seto, K.; Larson, D. J.; Warren, P. J.; Smith, G. D. W. |
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Grain Boundary Segregation in Boron Added Interstitial Free Steels Studied by 3-Dimensional Atom Probe |
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Journal Article |
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1999 |
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Scripta Materialia |
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Scripta Mater. |
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40 |
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1029-1034 |
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Technical Research Laboratories, Kawasaki Steel Corporation & Department of Materials, Oxford University |
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Elsevier |
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English |
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NU @ p-kolli @ |
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259 |
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Ikeno, S.; Matsuda, K.; Rengakuji, S.; Uetani, Y. |
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Precipitation sequence in a SiC/Al-Mg2Si alloy composite material |
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Journal Article |
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2001 |
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Journal of Materials Science |
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36 |
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8 |
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1921-1929 |
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Abstract The precipitation sequence of an Al-1.0mass%Mg2Si composite material having 8 vol.% SiC particles was investigated by Vickers micro hardness and specific electrical resistivity measurements, and by TEM observation. The formation of GP zones was suppressed in the composite material and its age-hardenability was reduced. Distribution of precipitates in the composite material was coarser and their size was larger than that in the Al-1.0mass%Mg2Si alloy (base alloy). Some types of precipitates in the composite material were not similar to those found in the base alloy but were similar to those in an Al-1.0mass%Mg2Si alloys with excess silicon (the excess Si alloy). Especially, the metastable phases in the composite material aged at 473 K belonged to the type-A, type-B and type-C precipitates, which are typical metastable phases in the excess Si alloy, instead of the betaprime phase that is a typical metastable phase in quasi-binary Al-Mg2Si alloys. The dislocations had little effect on the aging process of this composite material, because of the small number of dislocations introduced by the quenching after solution treatment. |
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NU @ karnesky @ |
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267 |
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Gomez de Salazar, J. M.; Barrena, M. I. |
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Dissimilar fusion welding of AA7020/MMC reinforced with Al2O3 particles. Microstructure and mechanical properties |
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Journal Article |
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2003 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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352 |
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1-2 |
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162-168 |
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Metal matrix composites; Welding; Microstructures; Mechanical testing |
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Metal matrix composites reinforced with Al2O3 particles combine the matrix properties with the ceramic properties of the reinforcement. However, its wide application as structural materials need of the proper development of their joining processes. The present work describes the results obtained from microstructural (Optical and scanning electron microscopy and electron probe microanalyser) and mechanical evaluation (hardness and tensile tests) of aluminum matrix composites (AA7005) reinforced with 10% vol. fraction Al2O3 particles (W7A10), welded to the unreinforced alloy AA7020 (Al–Zn–Mg), using metal inert gas welding process using ER4043 (Al–Si) and ER5356 (Al–Mg) as fillers. The thermal effect of welding on different types of joint results in a loss of the mechanical properties in the heat affected zones. These properties could be recovered with post-welding heat treatments. |
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NU @ karnesky @ |
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268 |
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Mohamed, Farghalli A.; Langdon, Terence G. |
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The transition from dislocation climb to viscous glide in creep of solid solution alloys |
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Journal Article |
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1974 |
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Acta Metallurgica |
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22 |
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6 |
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779-788 |
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There are two distinct and separate classes of creep behavior in metallic solid solution alloys. The mechanism of creep in Class I alloys appears to be some form of dislocation climb process, whereas the mechanism in Class II alloys appears to be a viscous glide process. By making assumptions concerning the nature of the climb and glide processes, and using existing experimental results for an Al-3% Mg alloy, it is shown that, to a, first approximation, the criterion for deformation by viscous glide is given by
Image
where B not, vert, similar 8 × 1012, σ is the applied stress, k is Boltzmann's constant, v is Poisson's ratio, γ is the stacking fault energy, G is the shear modulus, b is the Burgers vector, T is the absolute temperature, e is the solute-solvent size difference, and c is the concentration of solute atoms. The creep behavior of twenty-eight different solid solution alloys is analyzed, and it is shown that all alloys except one (Au-10% Ni) give results which are consistent with this criterion for viscous glide. |
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NU @ karnesky @ |
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307 |
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Li, Yong; Langdon, Terence G. |
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An Examination of Creep Data for an Al-Mg Composite |
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Journal Article |
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1997 |
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Metallurgical and Materials Transactions A |
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28 |
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1271-1273 |
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NU @ karnesky @ |
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311 |
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Akamatsu, Hiroki; Fujinami, Takayoshi; Horita, Zenji; Langdon, Terence G. |
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Influence of rolling on the superplastic behavior of an Al-Mg-Sc alloy after ECAP |
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Journal Article |
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2001 |
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Scripta Materialia |
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Scripta Mater. |
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44 |
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5 |
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759-764 |
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Aluminum alloy; Equal-channel angular pressing; Microstructure; Rolling; Superplasticity |
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NU @ karnesky @ |
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437 |
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