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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Reversible phase changes of Ni-rich Al-Co-Ni decagonal quasicrystals studied by means of transmission electron microscopy and thermal analysis
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Reversible phase changes of Ni-rich Al-Co-Ni decagonal quasicrystals studied by means of transmission electron microscopy and thermal analysis

机译：透射电镜和热分析研究富镍Al-Co-Ni十方准晶体的可逆相变

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摘要

In the stability region of the Ni-rich Al-Co-Ni decagonal quasicrystals, phase relationships among three different modulations, i.e. the so-called Ni-rich basic, S1-state and Type-I phases, and their phase changes have been thoroughly investigated by various transmission electron diffraction and imaging techniques in combination with thermal analysis. Electron diffraction experiments have clearly indicated that the S1-state phase formed in the Al_(70)Co_(12)Ni_(18) alloy, which is stable at 900 deg C, transforms into the Type-I phase by annealing at 650 deg C and that the Ni-rich basic phase formed in the Al_(71.5)Co_9Ni_(19.5) alloy, which is stable at 900 deg C, transforms into the Si-state phase by annealing at 650 deg C. In addition, differential scanning calorimetry measurements have evidenced for the first time that both phase changes occur reversibly at certain temperatures ranged between 700 and 800 deg C. The structural features of the modulations mentioned above have been distinguished and uniquely characterized by making the best use of high-angle annular detector dark-field scanning transmission electron microscopy as well as high-resolution transmission electron microscopy.
机译：在富镍的Al-Co-Ni十边形准晶体的稳定区域中，三种不同调制之间的相位关系，即所谓的富镍基础相，S1状态和I型相，以及它们的相变已被彻底地改变。通过各种透射电子衍射和成像技术结合热分析进行了研究。电子衍射实验清楚地表明，在900℃稳定的Al_（70）Co_（12）Ni_（18）合金中形成的S1状态相通过在650℃退火而转变为I型相。并且在900℃稳定的Al_（71.5）Co_9Ni_（19.5）合金中形成的富Ni基本相通过在650℃退火而转变为Si态相。此外，差示扫描量热法测量首次证明，在700至800摄氏度之间的某些温度下，两种相变都可逆地发生。上述调制的结构特征已被区分出来，并具有独特的特征，即充分利用了高角度环形检测器的暗色-场扫描透射电子显微镜以及高分辨率透射电子显微镜。

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