Masters Theses

Abstract

"Various theories have been put forward about the mechanism of compacting and sintering processes. None of these theories are confirmed. The reason is that most of these theories are based on observations on metallographic specimens, which is not a particularly good tool for such a study. Little data using xray diffraction analysis is available and there seems to be a great need of making a thorough investigation in this direction.

The main object of this investigation is to study xray diffraction patterns of green compacts of aluminum, nickel and copper powders pressed under different compacting pressures to see if any texture is observed, and also to compare their properties, such as deformation by cold working, density, etc.

The close similarity between recrystallization processes in reguline metals and during sintering has been observed. Much work has been done to study the mechanism of recrystallization and grain growth taking place in deformed metals (reguline) during annealing. Little work has been done to study the mechanism of recrystallization and grain growth processes taking place during the sintering of the powder metal compacts.

It is not known whether the processes of recrystallization and grain growth during sintering obey the fundamental laws of recrystallization, or whether the behavior of green compacts during sintering is different from reguline metals. Whether the work hardening is an essential requirement for the processes to take place, or whether it can take place without its existence, is still unanswered. How the cold working will effect the processes during sintering is still to be investigated. In this investigation, xray diffraction of the sintered compacts has been used to study the recrystallization and grain growth processes during sintering. Attempts have been made to go to as low pressures as possible to see whether the processes can take place during sintering. Xray diffraction patterns of sintered compacts compacted at higher compacting pressures, where there is strong work hardening, have also been made to study the effect on the rate of the process.

It is hoped that the present investigation will be useful, since it may help to understand the mechanism of the processes and to develop a theory to explain the effects that are seen during commercial compacting and sintering"--Introduction, pages 1-2.

Advisor(s)

Eppelsheimer, Daniel S., 1909-1988

Committee Member(s)

Straumanis, Martin E., 1898-1973
Kassner, James L.
James, William Joseph

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1959

Pagination

vii, 67 pages

Note about bibliography

Includes bibliographical references (pages 64-66).

Rights

© 1959 Rajendra Sharan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

X-rays -- DiffractionMetal powders -- AnalysisAluminum alloys -- Metallurgy

Thesis Number

T 1207

Print OCLC #

5926858

Electronic OCLC #

919314125

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