Masters Theses

Author

Lin Sheng Yu

Abstract

"Precise measurements of lattice parameters and densities of the alpha-phase Cu-In solid solutions were made at temperatures of 25°C. The thermal expansion coefficients between 15 and 65°C, the solid solubility of In in Cu at 650°C, and the soundness of crystal structure resulting from alloying were determined. The Cu-In alloys were prepared from high purity (99.999%) Cu and In by melting both metals inside evacuated quartz tubes. The solidified alloys were annealed and then examined by X-ray for homogeneity...The slowly solidified alpha-phase alloys gave densities lower than the theoretical (X-ray) values due to the presence of shrinkage microporosity. This density defect was found to increase with In concentration. The alloys quenched from the molten state, while still exhibiting lower density values, showed no visible porosity. However, upon annealing, voids appeared. It is very possible that the frozen-in vacancies in the quenched alloys coalesced during the prolonged heat treatment to voids visible under the optical microscope. The pores could be annihilated by plastic deformation (compression or rolling) and then the densities raised up to the theoretical. It is concluded that no structural defects (monovacancies) are formed during the cooling of Cu-In alloys, only microporosity probably due to differential shrinkage of the primary crystallization products as compared with the matrix"--Abstract, Pages ii-iii.

Advisor(s)

Straumanis, Martin E., 1898-1973

Committee Member(s)

Leighly, Hollis P., 1923-2004
James, William Joseph

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Sponsor(s)

Missouri University of Science and Technology. Graduate Center for Materials Research
United States. Office of Naval Research

Publisher

University of Missouri--Rolla

Publication Date

1968

Pagination

vii, 73 Pages

Note about bibliography

Includes bibliographical references.

Rights

© 1968 Lin Sheng Yu, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Solutions, Solid
Copper alloys -- Metallurgy
Indium alloys -- Metallurgy
Metals -- Heat treatment

Thesis Number

T 2188

Print OCLC #

6000792

Electronic OCLC #

844057842

Included in

Metallurgy Commons

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