Method of conditioning an object of shape-memory metallic alloy

Details Method of conditioning an object of shape-memory metallic alloy Method of conditioning an object of shape-memory metallic alloy

1986-03-13

1988-06-28

Dean, R.

Metal treatment

Compositions

Heat treating

148 115N, 148402, 200266, 428674, 428680, C22F 108

Patent

active

047536896

ABSTRACT:
The invention relates to a method of conditioning an object in shape-memory material of metallic alloy type.
The object formed to final shapes and dimensions constituting the first shape-memory state is submitted to a thermal treatment in order to bring this object to an austenitic crystallographic phase, then to cooling. The object is then submitted in at least one deformation zone to a process of education consisting of imposing on the object, in at least one cycle, a series of thermal and/or mechanical stresses. The stresses are such as to lead to deformation of the object for bringing it to a shape close to its second shape-memory state in a martensitic crystallographic state, then to permit the return of the object to its first shape-memory state, on a return of the object to the austenitic crystallographic state.
Application to electric contact elements.

REFERENCES:
patent: 3906623 (1975-09-01), Clabburn et al.
patent: 3985950 (1976-10-01), Maltz
patent: 4435229 (1984-03-01), Johnson
French Search Report FR 85 04 040.
French Search Report FR 85 04 041.
French Search Report FR 85 04 042.
French Search Report FR 85 11 088.
"Shape Memory Effect, Superelasticity and Damping in Cu--Zn--Al Alloys" Report 78R1, Katholieke Universiteit Leuven, Belgium, by L. Delaey et al., Feb. 1, 1978.
IEEE Transactions on Components, Hybrids and Manufacturing Technology, vol. CHMT-3, Jun. 1980, pp. 226-232, IEEE, New York, U.S.
C. J. Evans, "Connector Finishes, Tin in Place of Gold." p. 226.

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