Electrical Resistivity Study on Transformation of NiTi Alloys
Electrical Resistivity Study on Transformation of NiTi Alloys
复制标题
DOI：
10.2320/jinstmet1952.66.12_1350
复制
发表时间：
2002-12
影响因子：
--
通讯作者：
H. Matsumoto
中科院分区：
文献类型：
--
作者：
H. Matsumoto
采用四探针电位法精确测量近等原子NiTi合金的相变行为，以研究相变重复对热循环的影响。完整和不完整的热循环会导致电阻率异常增加，这归因于 R 相的形成。与完全热循环相比，不完全热循环对于R相的形成更为有效。热循环向R相的转变行为取决于成分，在Ms较高的NiTi中，通过热循环诱导和稳定R相更加困难。热循环影响的特点是Ms向低温侧移动和R相的稳定，这可归因于相变诱导缺陷的积累。事实证明，电阻率的精确测量有助于检测 R 相的痕迹并表征热循环的影响。
The transformation behavior of near equiatomic NiTi alloys were precisely measured by a fourprobe potentiometric method in order to investigate the effects of the repetition of the transformation with thermal cycling. Complete and incomplete thermal cycles induce an anomalous increase in electrical resistivity which is attributed to formation of the Rphase. The incomplete thermal cycle is effective in the formation of the Rphase in comparison with the complete thermal cycle. The behavior of the transformation to the Rphase with thermal cycles depends on the composition and it is more difficult to induce and stabilize the Rphase by thermal cycling in NiTi with higher Ms. The characteristics on the effects of the thermal cycles are the shift of the Ms to the lowtemperature side and the stabilization of the Rphase, which are taken to be attributable to the accumulation of transformationinduced defects. The precise measurement of the electrical resistivity proved helpful in order to detect the trace of the R phase and characterize the effects of the thermal cycles.