Abstract
IN metallic systems which may undergo a diffusionless (or martensitic) transformation on cooling, it has been found that transformation may also be induced above M s by plastic deformation under favourable conditions1. The phenomenon has been investigated exhaustively in steels and in one or two non-ferrous systems; but its study in titanium alloys has received little attention up to now. Many titanium systems show a very interesting phenomenon in that a rather abrupt drop in M s occurs when the alloy content is increased above a certain critical value2. Such an effect is not to be expected from general thermodynamic considerations of the constitution diagrams and has been attributed to the occurrence of some form of stabilization3. To examine this in greater detail, an investigation was made of the effect of deformation on a titanium −10 per cent chromium alloy, for which, according to extrapolation of known data, M s should be about 200° C.2, although the alloy can be cooled down to −196° C. without transformation occurring.
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References
Troiano, A. R., and Greninger, A. B., “Metals Handbook, 1948”, 263 (Amer. Soc. Metals, Cleveland).
Duwez, P., Trans. Amer. Soc. Metals, 45, 934 (1953).
DeLazaro, D. J., Hansen, M., Riley, R. E., and Rostoker, W., Trans. Amer. Inst. Min. Met. Eng., 194, 265 (1952).
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OTTE, H. Transformation in a Titanium - Chromium Alloy. Nature 174, 506 (1954). https://doi.org/10.1038/174506a0
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DOI: https://doi.org/10.1038/174506a0
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