The decreasing solid solubility limit at the titanium-rich end of the titanium-copper constitutional diagram suggests the possibility that titanium-rich alloys may be age-hardenable. However, results obtained by previous investigators, using lump samples, show that after quenching from 790°C the age-hardening of an alloy containing 1,7 percent copper is very light while a 0.8 percent copper alloy decreases in hardness, during heat treatment at 400°C.
It was believed possible that powder samples of alloys might show different results from the lump samples used by previous investigators. Consequently, a 1.90 percent copper alloy was made by the technique of levitation melting, checked for homogeneity, and filings of 48-65 Tyler screen size were cut from it for aging experiments.
Hardness readings do show a hardness peak at aging temperatures of 400°C, 450°C, and 500°C and thus indicate that the titanium-copper alloy is susceptible to age-hardening treatments.
Interest in the Mn₆₀A1xZn₂₀_ₓC₂₀ and Mn₆₀GaₓZn₂₀-ₓC₂₀ systems results from pregious studies of Mn-A1-C, Mn-Zn-C, and Mn-Ga-C systems; in particular the alloys near compositions Mn₆₀A1₂₀C₂₀, Mn₆₀Zn₂₀C₂₀ and Mn₆₀Ga₂₀C₂₀.
The saturation magnetization (σ) versus temperature (T) curve for alloys near the compositions Mn₆₀A1₂₀C₂₀ and Mn₆₀Ga₂₀C₂₀ shows normal ferromagnetic behaviour from 0°K to the Curie points of the alloys. Alloys near the composition Mn₆₀Zn₂₀C₂₀, on the other hand, have abnormal behaviour as they experience a maximum in the σ-T curve in the neighbourhood of -40°C. Reasons for investigating the Mn₆₀A1Zn₂₀-xC₂₀ andMN₆₀GaₓZn₂₀-ₓC₂₀ systems were:
1. to provide further data regarding the presence of abnormal behaviour in Mn₆₀Zn₂₀C₂₀ and of normal behaviour in Mn₆₀A1₂₀C₂₀ and Mn₆₀Ga₂₀C₂₀. (i.e. alloys near these compositions).
2. to suggest how the valency of the cube-corner atom affects the normal ferromagnetic moment of these alloys.
However, investigation of these systems has lead to even more complicated phenomena, and the above two items remain, to a large extent, unsolved. / Applied Science, Faculty of / Mining Engineering, Keevil Institute of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/40404 |
| Date | January 1956 |
| Creators | Howe, Lawrence Martin |
| 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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