Ti-content dependence of transformation pseudoelastivity characteristics of TixNi(92−x)Cu8 shape memory alloys
Ti-content dependence of transformation pseudoelastivity characteristics of TixNi(92−x)Cu8 shape memory alloys
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DOI：
10.1016/s0921-5093(97)00119-6
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发表时间：
1997-09
期刊：
影响因子：
6.4
通讯作者：
S. M. Tan;S. Miyazaki
中科院分区：
文献类型：
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作者：
S. M. Tan;S. Miyazaki
研究了TixNi(92−x)Cu8(at.%)(X=49.0-51.0)合金在673K和773K下的相变伪弹性(超弹性)特性与钛含量的关系。结果表明，当钛含量接近50.0at.%时，合金的最大回复应变大于贫钛和富钛合金。在49.0-50.0at.%的钛含量范围内，应力滞后随钛含量的降低而增大，而在50.0-51.0at.%的钛含量范围内，应力滞后几乎保持不变。773K下的样品比673K下的样品表现出更强的应力滞后和最大回复应变与钛含量的关系。在773K和673K两种温度下，合金的滑移临界应力与钛含量的关系不大，这是由于两种析出相和合金中残留位错的作用。
Ti-content dependence of transformation pseudoelasticity (superelasticity) characteristics of TixNi(92−x)Cu8(at.%)(X=49.0–51.0) alloys was investigated for the specimens annealed at 673 and 773 K, respectively. It was found that the maximum of recovery strain of the alloys with the composition of near 50.0at.%Ti is larger than those of the alloys with the composition of Ti-poor and Ti-rich content. The stress-hysteresis increases with decreasing Ti-content in the range of 49.0–50.0at.%Ti, but it keeps almost constant in the range of 50.0–51.0at.%Ti. The specimens annealed at 773 K exhibit stronger Ti-content dependence of stress-hysteresis and maximum of recovery strain than those annealed at 673 K do. The critical stress for slip exhibits little dependence on Ti-content for both the specimens annealed at 773 and 673 K. The above phenomena are attributable to the effect of two types of precipitates and remained dislocations in the alloys.