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AssigneeBBC Brown, Boveri & Company, Limited
InventorsJoachim Albrecht, Thomas Duerig
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A composite material in rod, tube, strip, sheet or plate shape with reversible thermomechanical properties is produced by joining of at least two parts consisting of a total of at least one shape memory alloy having a two-way effect, whereby each part has a memory effect by itself. In the case of at least two shape memory alloys (1, 2) with different transition temperatures but the same mode of movement, the joining of the individual parts can take place prior to the deformation in the low temperature range necessary to inducing the two-way effect. In the case of differing types and degrees of movement of the individual parts (25, 26), their joining can first be accomplished only after the individual deformations of each part for itself in the low temperature range are accomplished regardless of how many shape memory alloys with different transition temperatures are used in the structure of the composite material.
A process for the production of a composite material with reversible thermomechanical properties, comprising joining at least two parts having a memory effect and each of said parts being of at least one shape memory alloy having a two-way effect, by rolling, compression molding, extrusion, welding, soldering, diffusion joining or powder metallurgy.
A prismatic bending bar having reversible thermomechanical properties, comprising a first part, said first part comprising a shape memory alloy comprising 45.5 wt.% Ti, 10 wt.% Cu, and the remainder Ni, said first part having a width of 2.5 mm, a thickness of 1.2 mm and a length of 35 mm, joined to a second part, said second part comprising a shape memory alloy comprising 14.4 wt.% Al, 3.2 wt.% Ni, and the remainder Cu, said second part having the same width, thickness and length as said first part, to form said prismatic bending bar;
A process for the production of a prismatic bending bar having reversible thermomechanical properties, said bending bar having two parts, said first part comprising a shape memory alloy comprising 45.5 wt.% Ti, 10 wt.% Cu, and the remainder Ni, and a second part comprising a shape memory comprising 14.4 wt.% Al, 3.2 wt.% Ni, and the remainder Cu, wherein the transformation temperatures of said first part are A.sub.S =70.degree. C. and A.sub.F =95.degree. C., and the transformation temperatures of said second part are A.sub.S =120.degree. C. and A.sub.F =150.degree. C., comprising the steps of:
A shaped part made of a composite material having shape memory properties, said shaped part comprising at least two sections, at least one of said sections having a two-way memory effect, and said sections being coupled metallurgically together.
Dependencies are inferred from the claim text.