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Temporal evolution of the microstruc...

Fuller, Christian Bennett.

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Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties./
Author:	Fuller, Christian Bennett.
Description:	178 p.
Notes:	Advisers: David N. Seidman; David C. Dunand.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087910

Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties.
Fuller, Christian Bennett.

Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties. - 178 p.

Advisers: David N. Seidman; David C. Dunand.

Thesis (Ph.D.)--Northwestern University, 2003.

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.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties.
LDR:03545nam 2200313 a 45 001 928324
005 20110426
008 110426s2003 eng d
035 $a (UnM)AAI3087910
035 $a AAI3087910
040 $a UnM $c UnM
100 1 $a Fuller, Christian Bennett. $3 1251785
245 1 0 $a Temporal evolution of the microstructures of aluminum(scandium, zirconium) alloys and their influences on mechanical properties.
300 $a 178 p.
500 $a Advisers: David N. Seidman; David C. Dunand.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1864.
502 $a Thesis (Ph.D.)--Northwestern University, 2003.
520 $a 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.
520 $a 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.
520 $a 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.
520 $a Mechanical properties of Al(Sc,Zr) alloys are investigated utilizing Vicker's 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−xZr x precipitates is found to improve the alloy strength, by pinning subgrain and grain boundaries, as shown by hardness, tensile, and fatigue measurements.
590 $a School code: 0163.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0743
690 $a 0794
710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 64-04B.
790 $a 0163
790 1 0 $a Dunand, David C., $e advisor
790 1 0 $a Seidman, David N., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087910