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Type Harada, Y.; Dunand, D.C.
  Publication Microstructure and Creep Properties of Al[sub:3]Sc with Ternary Transition Metal Additions Volume Book Chapter
Pages 2001
  Abstract (up) The 7th International Conference on Creep and Fatigue at Elevated Temperature (Creep VII)  
  Corporate Author  
Publisher  
Editor
  Summary Language 219-226 Series Editor Al-Sc  
Abbreviated Series Title
  Series Issue ISSN  
Medium
  Expedition Japan Society of Mechanical Engineers Notes  
Call Number  
Contribution Id  
Serial URL ISBN  
no NU @ karnesky @ 1904
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Marquis, E. A.; Seidman, D. N; Dunand, D. C. Microstructural, and Creep Properties of an Al-2 Mg-0.2 Sc (wt.%) Alloy Book Chapter 2003 Hot Deformation of Aluminum Alloys III 177-184 Al-Sc TMS Warrendale, PA Zin, J.; Beaudoin, A.; Bieler, T. A.; Radhakrishnan, B. no NU @ karnesky @ 1906
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Fuller, Christian B.; Seidman, David N.; Dunand, David C. Structure-Property Relationships for Al(Sc,Zr) Alloys Book Chapter 2003 Hot Deformation of Aluminum Alloys III 531-540 Al-Sc TMS Warrendale, PA Zin, J.; Beaudoin, A.; Bieler, T. A.; Radhakrishnan, B. no NU @ karnesky @ 1907
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Marquis, E. A.; Seidman, D. N.; Dunand, D. C. Creep of Precipitation-Strengthened Al(Sc) Alloys Book Chapter 2002 Creep Deformation: Fundamentals and Applications 299-308 Al-Sc TMS Warrendale, PA Mishra, Rajiv S.; Earthman, James C.; ;Raj, Sai V. 0873395158 no refbase @ user 1384
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Karnesky, Richard A.; Seidman, David N Criteria for Consistent Steady-State Coarsening Journal Article 2007 Scripta Materialia Scripta Mater. In Preparation Al-Sc no NU @ karnesky @ 1912
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Marquis, E. A.; Seidman, D. N. A Subnanoscale Study of Segregation at Al/Al[sub:3]Sc Interfaces Journal Article 2002 Microscopy and Microanalysis 8 S2 1100-1101 Al-Sc no NU @ karnesky @ 1905
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Fuller, Christian B.; Seidman, David N.; Dunand, David C. Creep Properties of Coarse-Grained Al(Sc) Alloys at 300°C Journal Article 1999 Scripta Materialia Scripta Mater. 40 6 691-696 Al-Sc no NU @ karnesky @ 527
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Monachon, C.; Krug, M. E.; Seidman, D. N.; Dunand, D. C. Chemically and Structurally Complex Nanoscale Core/Double-Shell Nanoscale Precipitates in an Al-Li-Sc-Yb Alloy Journal Article 2010 Acta Materialia Submitted Al-Sc no NU @ karnesky @ 10883
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Harada, Y.; Dunand, D.C. Creep Properties of Al[sub:3]Sc and Al[sub:3](Sc, X) Intermetallics Journal Article 2000 Acta Materialia Acta Mater. 48 13 3477-3487 Journal Article; Aluminum compounds, Mechanical properties; Scandium compounds, Mechanical properties; Intermetallics, Mechanical properties; Titanium, Alloying additive; Yttrium, Alloying additive; Zirconium, Alloying additive; Hafnium, Alloying additive; Creep (materials), Alloying effects; Dislocation mobility, Deformation effects; Al-Sc; mechanical properties creep intermetallic compounds bulk diffusion scandium microstructure high-temperature creep l12 trialuminides self-diffusion behavior fracture films al3ti compression chromium aluminum A systematic creep study was undertaken for the binary intermetallic Al sub 3 Sc and the ternary single-phase intermetallic Al sub 3 (Sc sub 0.74 X sub 0.26 ), where X is one of the transition-metals Ti, Y, Zr or Hf. Creep tests were conducted in the temperature range from 673-1200K under a constant compressive stress ranging from 30-300 MPa. The binary Al sub 3 Sc exhibits a stress exponent of 4.4-4.9 indicative of creep controlled by climb of dislocations. The activation energy for creep of Al sub 3 Sc was 128plus/minus6 kJ/mol, close to that for self-diffusion for pure aluminum, in agreement with the Cu sub 3 Au rule, indicating that diffusion on the Al-sublattice is controlling. Ternary Al sub 3 (Sc sub 0.74 X sub 0.26 ) exhibits a decrease in creep rate by about one order of magnitude for Zr and Hf and by about two orders of magnitude for Ti and Y. For all ternary alloys, a stress exponent of 3.9-5.5 was observed, indicative of dislocation creep. Activation energies for creep of 202plus/minus8 kJ/mol were found, showing that ternary substitution for scandium with transition metals affects diffusion on the Al sublattice. Northwestern University (Evanston); Ministry of International Trade and Industry (Japan) English 1359-6454 37 ref., Photomicrographs, Graphs, Numerical Data no NU @ karnesky @ 544
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Fuller, Christian B. Temporal Evolution of the Microstructures of Al(Sc,Zr) Alloys and Their Influences on Mechanical Properties Book Whole 2003 179 Al-Sc Al(Sc) alloys represent a new class of potential alloys for aerospace and automotive applications. These alloys have superior mechanical properties due to the presence of fine, coherent, unshearable Al3Sc precipitates, which form upon the decomposition of an supersaturated Al(Sc) solid-solution. Additions of Zr to Al(Sc) are found to improve alloy strength and coarsening resistance, but the operating mechanisms are not well understood. In this thesis, the relationships between the mechanical and microstructural properties of Al(Sc,Zr) alloy are presented. Three-dimensional atom probe microscopy (3DAP) and conventional and high-resolution transmission electron microscopies (CTEM and HREM) are utilized to study the temporal evolution of Al3Sc1-xZrx (L12 structure) precipitates in dilute Al(Sc,Zr) alloys (precipitate volume fractions < 1%) aged between 300 and 375°C. Concentration profiles, obtained with 3DAP, show Sc and Zr to partition to Al3Sc1-xZrx precipitates, and Zr to segregate near the Al/Al3Sc1-xZrx interface. CTEM and 3DAP are utilized to determine the temporal evolution of Al(Sc,Zr) alloys, which is discussed employing diffusion-limited coarsening theories. Zirconium additions are found to retard the precipitate coarsening kinetics and stabilize precipitate morphologies. Mechanical properties of Al(Sc,Zr) alloys are investigated utilizing Vickerís microhardness and creep. Deformation at ambient-temperature is explained by classic precipitation-strengthening mechanisms, where a transition between precipitate shearing and Orowan looping is calculated to occur at an average precipitate radius, <r>, of 2-3 nm. Al(Sc,Zr) alloys deformed by creep at 300°C are found to exhibit a climb controlled threshold stress, which is shown to increase with <r>, in agreement with previous results in Al(Sc) alloys and a previous general climb model considering the interaction between dislocations and coherent misfitting precipitates. Finally, the effect of various heat-treatments upon the microstructure and mechanical properties of a rolled 5754 aluminum alloy modified with 0.23 wt.% Sc and 0.22 wt. % Zr are investigated. The presence of the Al3Sc1-xZrx precipitates is found to improve the alloy strength, by pinning subgrain and grain boundaries, as shown by hardness, tensile, and fatigue measurements. Northwestern University Ph.D. thesis no NU @ karnesky @ 147
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