| 摘要 |
PURPOSE:To provide cold workability as well as shape memorizability due to superior R phase transformation and to enable behavior at low temp., by adding Cr to Ni-Ti and by properly setting up a compositional range and heat treatment conditions. CONSTITUTION:In the ternary diagram of Ni, Ti, and Cr, each composition is regulated so that it is within the area enclosed with a pentagon connecting the points A, B, C, D, E, where the angle A describes, by atom, 48.6% Ni, 49.4% Ti, and 2.0% Cr, the angle B describes 49.4% Ni, 49.2% Ti, and 1.4% Cr, the angle C describes 50.9% Ni, 49.0% Ti, and 0.1% Cr, the angle D describes 50.1% Ni, 49.8% Ti, and 0.1% Cr, and the angle E describes 47.8% Ni, 50.2% Ti, and 2.0% Cr. This alloy is cold-worked at >=15% draft and then subjected to shape memory treatment at about 300-500 deg.C. This alloy has various characteristics such as behavior at low temp., long life, low hysteresis, etc. |
