标题：Martensitic transformation and mechanical properties of Ti-rich Ti-Ni-Cu melt-spun ribbon
作者：He Wen-jun; Min Guang-hui; Yin Yan-sheng; Tolochko, O.
作者机构：[HE Wen-jun] Institute of Materials Science and Engineering,Ocean University of China, Qingdao, Shandong 266100, China.;[YIN Yan-sheng] Institute of M 更多
会议名称：Frontier Symposium of China Postdoctors on Materials Science
会议日期：NOV 22-25, 2009
来源：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
关键词：Ti-Ni-Cu alloy; melt spinning; shape memory properties; superelasticity;; dynamic mechanical analysis
摘要：Martensitic trans formation, mechanical and thermomechanical properties of a Ti-rich Ti(52)Ni(23)Cu(25) melt spun ribbon annealed at a temperature below the crystallization temperature were studied by XRD, DSC and DMA. After annealing the initially amorphous ribbon at 400 degrees C for 10 h, the ribbon is fully crystallized and exhibits one-stage B2 <-> B19 phase transformation with the temperature hysteresis of 14 degrees C. The annealed ribbon is composed of B2, B19 and B11-TiCu phase with (001) preferential orientation. On the stress-strain curves, the rearrangement of the martensite variants and stress-induced martensitic transformation are observed below the M(f) temperature and above the A(f) temperature, respectively. The annealed ribbon exhibits up to 1.6% superelastic shape recovery with small stress hysteresis of 25 MPa. No flat stress-plateau is associated with the superelasticity. The annealed ribbon shows a well-defined shape memory effect during thermal cycling from -60 to 100 degrees C. The transformation strain and recovery strain increase with increasing the applied external stress. Under the external stress above 150 MPa, the shape recovery strain is not sensitive to it and keeps stable at about 1.74%.