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首页> 外文会议>International Conference on Proceeding amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Enlarging the temperature range for maximum wear resistance of TiNi alloy using a NTE phase
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Enlarging the temperature range for maximum wear resistance of TiNi alloy using a NTE phase

机译：使用NTE相扩大TiNi合金最大耐磨性的温度范围

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摘要

The near-equiatomic TiNi alloy has been demonstrated to possess high wear resistance, which largely benefits from its pseudoelasticity (PE). However, the PE occurs only in a small temperature range, which makes the wear resistance of this alloy unstable as temperature changes, caused by environmental instability or frictional heating. Therefore, enlarging the working temperature of PE could considerably improve this alloy as a novel wear-resistant material. One possible approach is to develop a self-built temperature-dependent internal stress field by taking the advance of the difference in thermal expansion between the pseudoelastic matrix and a reinforcing phase. Such a T-dependent internal stress could adjust the martensitic transformation temperature to respond changes in environmental temperature so that the temperature range of PE could be enlarged, thus leading to a wide temperature range in which the minimum wear loss is retained. Research was conducted to investigate effects of an added second phase having a negative thermal expansion (NTE) coefficient on the wear resistance of a near-equiatomic TiNi alloy. It was demonstrated that the temperature range of this modified material in which the wear loss dropped was enlarged. In addition, the wear resistance of such a TiNi-matrix composite was on one order of magnitude higher than that of unmodified TiNi alloy.
机译：事实证明，近等原子的TiNi合金具有很高的耐磨性，这在很大程度上得益于其拟弹性（PE）。然而，PE仅在较小的温度范围内发生，这使得该合金的耐磨性由于环境不稳定性或摩擦加热而随温度变化而不稳定。因此，提高PE的工作温度可以大大改善这种合金作为新型耐磨材料的性能。一种可能的方法是通过利用伪弹性基体和增强相之间的热膨胀差异来发展自建的温度相关的内部应力场。这种与T有关的内应力可以调节马氏体转变温度以响应环境温度的变化，从而可以扩大PE的温度范围，从而导致在其中保持最小磨损损耗的宽温度范围。进行了研究以调查添加的具有负热膨胀（NTE）系数的第二相对近等原子TiNi合金的耐磨性的影响。结果表明，该磨损率下降的改性材料的温度范围扩大了。另外，这种TiNi基复合材料的耐磨性比未改性的TiNi合金高一个数量级。

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