Microstructure modifications of Ti-Ni-Cu shape memory alloy strips fabricated by arc melt overflow process
(0) Six batches of Ti50Ni50-xCux alloy (x=0-25) were prepared by a melt overflow process and strips of about 550μm thickness were fabricated by rapid solidification. Microstructures and shape memory characteristics were investigated by means of x-ray diffraction (XRD), optical microscopy, differential scanning calorimetry and thermal cycling tests under a constant load. The microstructures of the as-cast strips exhibited columnar grains normal to the strip surface. XRD showed B2-B19 martensitic transformation in the Ti50Ni50 binary alloy strip, while B2-B19 martensitic transformation in all the ternary alloy strips. The transformation temperature (Ms) increased with Cu-content. During cycle deformation with an applied stress of 60MPa, the smallest transformation hysteresis and the largest elongation associated with the B2-B19 transformation were observed to be 3.5％ in Ti50Ni25Cu25 alloy strip and 3.02％ in Ti50Ni40Cu10 alloy strip.
Yeon-Wook Kim Sang-Hoon Lee Tae-Hyun Nam
Department of Advanced Materials Engineering, Keimyung University, 1000 Shindang-dong, Dalseo-gu, Ta Division of Materials Engineering and ERI, Gyeongsang National University, 900 Gazwadong, Jinju, Gye
国际会议
第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)
杭州
英文
245-249
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）