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Kinetics of transformation of deform...

Wongpreedee, Kageeporn.

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Kinetics of transformation of deformation processed gold-matrix composite.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Kinetics of transformation of deformation processed gold-matrix composite./
Author:	Wongpreedee, Kageeporn.
Description:	87 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0415.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Engineering, Metallurgy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3118267

Kinetics of transformation of deformation processed gold-matrix composite.
Wongpreedee, Kageeporn.

Kinetics of transformation of deformation processed gold-matrix composite. - 87 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0415.

Thesis (Ph.D.)--Iowa State University, 2003.

Gold matrix D&barbelow;eformation-processed M&barbelow;etal M&barbelow;etal C&barbelow;omposites (DMMC) have been developed that have better strength and conductivity than conventional gold alloys. However, DMMC possess metastable two-phase microstructures, and their strength and conductivity decrease after prolonged exposure to elevated temperatures. The kinetics of the transformation from the metastable two-phase microstructure to the equilibrium single-phase solid solution is of interest.Subjects--Topical Terms:

1023648
Engineering, Metallurgy.

Kinetics of transformation of deformation processed gold-matrix composite.
LDR:03002nmm 2200289 4500 001 1866182
005 20041220114132.5
008 130614s2003 eng d
035 $a (UnM)AAI3118267
035 $a AAI3118267
040 $a UnM $c UnM
100 1 $a Wongpreedee, Kageeporn. $3 1953591
245 1 0 $a Kinetics of transformation of deformation processed gold-matrix composite.
300 $a 87 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0415.
500 $a Major Professor: Alan M. Russell.
502 $a Thesis (Ph.D.)--Iowa State University, 2003.
520 $a Gold matrix D&barbelow;eformation-processed M&barbelow;etal M&barbelow;etal C&barbelow;omposites (DMMC) have been developed that have better strength and conductivity than conventional gold alloys. However, DMMC possess metastable two-phase microstructures, and their strength and conductivity decrease after prolonged exposure to elevated temperatures. The kinetics of the transformation from the metastable two-phase microstructure to the equilibrium single-phase solid solution is of interest.
520 $a This document describes a study of the elevated temperature stability of Au DMMC's and the relationship between microstructure and resistivity of three compositions: Au-7 vol %Ag, Au-14 vol %Ag, and Au-vol 7%Pt. DMMC samples were prepared by a powder metallurgy technique and mechanical processes. The smallest final diameter of these wires was 120 mum. Avrami and Arrhenius relations were used to evaluate the kinetic transformation. The extensive deformation used to produce these composites reshaped the initially equi-axed powder particles into a nanofilamentary composite. Electrical resistivity measurements were used to determine the degree of transformation from the initial metastable nano-filamentary composite to the equilibrium solid solution condition. These measurements indicated that this transformation in Au-14 at%Ag, Au-7 at %Ag Au and Au-7 at %Pt DMMC wires proceeded with activation energies of 141, 156, and 167 kJ/mol, respectively.
520 $a It is thought that these empirically determined activation energies differ from those determined in single crystal, planar interface Au-Ag and Au-Pt diffusion couples due to chemical potential, surface curvature, and strain effects. The DMMC systems reach the equilibrium solid solution condition faster than single crystal, planar interface systems for two reasons: (1) far more defects (dislocations, grain boundaries, vacancies from non-conservative dislocation motion, etc.) are present in the Au-Ag and Au-Pt DMMC composites, and (2) the small radius of curvature of the Ag and Pt filaments increases the chemical potential for diffusion in the DMMC.
590 $a School code: 0097.
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0743
690 $a 0794
710 2 0 $a Iowa State University. $3 1017855
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Russell, Alan M., $e advisor
790 $a 0097
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3118267