Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1988-03-29
1990-04-24
Roy, Upendra
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148402, 420417, C22F 100, C22F 110
Patent
active
049191772
ABSTRACT:
A method of treating a Ti-Ni shape memory alloy to improve their various characteristic properties. In a first step of the method, a wire of the shape memory alloy is held at a high temperature within a predetermined range to be turned into a solid solution, and thereafter, cooled, whereby plastic strain in it is removed and crystals of the alloy are grown. In a second step of the method, current pulse is passed through the wire to rapidly heat it to a temperature higher than its M.sub.f point to cause elongation due to transformation superplasticity to it. In a third step of the method, the application of the pulse is stopped, the wire is rapidly cooled to the temperature of its M.sub.f point or below, and tensile load is applied to the wire immediately after the stop of the application of the pulse to cause elongation to the wire again in a cooling process, and thereafter the load is removed or sufficiently decreases to stop the deformation when the value of m concerning the wire is sharply decreased. Then, the second and the third steps are repeated a required number of times.
REFERENCES:
patent: 3594239 (1971-07-01), Wang
patent: 3953253 (1976-04-01), Clark
patent: 4631094 (1986-12-01), Simpson et al.
patent: 4707196 (1987-11-01), Honma et al.
patent: 4740253 (1988-04-01), Simpson et al.
patent: 4747887 (1988-05-01), Honma
Touminen et al., Jour. of Metals, Feb. 1988, pp. 32-35.
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