| 摘要 |
PURPOSE:To obtain an NiTi shape memory alloy material at a low cost with a heat treatment at a low temp. for a short time by joining alternately >=3 layers of members consisting of Ti and Ni wherein the weight ratio of Ni is regulated to bring the members into tight contact with each other then heating the members to form a TiNi phase. CONSTITUTION:A rod wherein 3 layers; the 1st Ti rod 1, the 1st Ni rod 2, and the 2nd Ti rod 3 are superposed so as to contain 50-60wt% Ni by weight is prepd. Such rod is then heated to diffuse Ti and Ni to each other thereby forming an intermetallic TiNi compd. at the boundary between the Ti and Ni, that is, the boundary between the Ti rod 1 and the Ni rod 2 and the boundary between the Ni rod 2 and the Ti rod 3. If the Ti and Ni are so selected as to have, for example, 1:1 atom ratio in the thickness direction of the rod, a thick plate 4 which is a shape memory alloy consisting of the single TiNi layer is obtd. by long-term heating. |
