Experiments were carried out with 1 micron copper powder compacts containing up to 7.5 vol % .018 micron alumina, and with various types of lead powder compacts containing up to 20 vol % of various other materials.
The results indicate that dispersion-hardened alloys should be divided into three groups on the basis of the nature of the second phase.
i) particulate, adherent (not coherent) with matrix
ii) particulate, non-adherent with matrix
iii) semi-continuous
It is suggested that the room temperature strengthening of the second and third groups of alloys may be due primarily to a grain size effect as described by the Hall-Petch relationship.
The cell-like structure recently proposed for S.A.P. has been observed in the lead-lead oxide system by electron microscopy.
An explanation of the difference in properties between extruded and rolled dispersion-hardened alloys has been offered in terms of the directional deformation caused by rolling. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/38618 |
| Date | January 1963 |
| Creators | Armstrong, John Torrance |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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