DAMPING CAPACITY AND MECHANICAL PROPERTY OF NiTiNb SHAPE MEMORY ALLOYS
(NiTi)_(50-0．5x)Nb_x形状记忆合金的阻尼性能及力学性能

Two-phase NiTi base alloys (NiTi)50-0.5xNbx (x=5, 10, 15, 20) with both high damping capacity and high yield strength have been prepared by addition of Nb. With increasing Nb content, the fraction of eutectic (NiTi+β--Nb) increases, and yield strength in martensite state rises. When x=15, the yield strength reaches the highest value of 289 MPa. And the alloys also exhibit high damping capacity, tanδ>0.01. According to the damping mechanism for the shape memory alloys, the relationship between the damping properties and temperatures of NiTiNb alloys was explained, and phase boundary damping from the β-Nb and NiTi phases was discussed.