Pre-Martensitic Phenomenon in NiTi Studied by Positron Lifetime Spectroscopy
Pre-Martensitic Phenomenon in NiTi Studied by Positron Lifetime Spectroscopy
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正电子寿命能谱研究镍钛合金中的前马氏体现象
DOI：
10.4028/www.scientific.net/msf.327-328.437
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Y. Shirai
中科院分区：
文献类型：
--
作者：
H. Araki;N. Matake;P. Chalermkarnnon;Y. Shirai
用对物质电子结构变化非常敏感的正电子寿命谱研究了Ni51Ti49中的预马氏体现象。在本工作中，我们发现了Ni51Ti49马氏体相变温度以上的正电子寿命的反常变化：即使在比M S温度高100度的温度下，正电子寿命也随着温度的降低而反常地增加。在加热过程中也观察到了几乎相同的正电子寿命变化，几乎没有滞后，这清楚地表明，所观察到的正电子寿命的预马氏体变化是由于NiTi合金的本征电子结构变化造成的，这种变化导致了所谓的预马氏体现象。
The pre-martensitic phenomenon in Ni 51 Ti 49 has been studied by positron lifetime spectroscopy which is quite sensitive to electronic-structural changes of matter. In this work we have found an anomalous positron lifetime change above martensitic transformation temperature of Ni 51 Ti 49 : positron lifetime increases anomalously with decreasing temperature even at temperatures 100 degrees higher than the M s temperature of the alloy. Almost the same change in positron lifetime also has been observed on the heating run with little hysteresis, which clearly indicates that the observed pre-martensitic change of positron lifetime is due to the intrinsic electronic-structural change of NiTi alloys which causes so-called pre-martensitic phenomena.