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首页> 外文会议>Symposium on Amorphous and Nanocrystalline Metals; 20031201-20031204; Boston,MA; US >Medium-Range Order and Crystallization in Zr_(59)Cu_(20)Al_(10)Ni_8Ti_3 and Zr_(57)Cu_(20)Al_(10)Ni_8Ti_5 Metallic Glasses Investigated by NMR
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Medium-Range Order and Crystallization in Zr_(59)Cu_(20)Al_(10)Ni_8Ti_3 and Zr_(57)Cu_(20)Al_(10)Ni_8Ti_5 Metallic Glasses Investigated by NMR

机译：NMR研究Zr_（59）Cu_（20）Al_（10）Ni_8Ti_3和Zr_（57）Cu_（20）Al_（10）Ni_8Ti_5金属玻璃的中程有序和结晶

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摘要

Medium-range order and quasicrystal formation in Zr_(57)Cu_(20)Al_(10)Ni_8Ti_5 and Zr_(59)Cu_(20)Al_(10)Ni_8Ti_3 metallic glasses are investigated by means of nuclear magnetic resonance (NMR). The samples are prepared by rapid solidification and annealed to induce primary quasicrystal formation. ~(27)Al and ~(63)Cu NMR spectra and spin relaxation curves are recorded before and after the annealing process. The spectral width of ~(27)A1 and ~(63)Cu NMR spectra is relatively small and can be taken as a proof for the presence of medium-range order in these metallic glasses. By simulations of ~(27)Al and ~(63)Cu NMR second moments in various binary Al and Cu compounds the medium-range orders L_(12) AlZr_3 and C_(11b) CuZr_2 can be identified in both as-quenched metallic glasses. After heat treatment both metallic glasses show considerable changes in the ~(63)Cu NMR second moments, whereas the ~(27)Al NMR second moments show only relatively small changes. Furthermore, the ~(63)Cu NMR second moment after heat treatment in Zr_(57)Cu_(20)Al_(10)Ni_8Ti_5 is about half as large as in Zr_(59)Cu_(20)Al_(10)Ni_8Ti_3 indicating different types of crystallization during heat treatment.
机译：通过核磁共振（NMR）研究了Zr_（57）Cu_（20）Al_（10）Ni_8Ti_5和Zr_（59）Cu_（20）Al_（10）Ni_8Ti_3金属玻璃的中程有序和准晶体形成。样品通过快速凝固制备并退火以诱导初级准晶体形成。在退火过程之前和之后，记录〜（27）Al和〜（63）Cu NMR光谱和自旋弛豫曲线。 〜（27）A1和〜（63）Cu NMR光谱的光谱宽度相对较小，可以作为这些金属玻璃中存在中程有序的证据。通过模拟各种二元Al和Cu化合物中的〜（27）Al和〜（63）Cu NMR第二矩，可以在两种淬火的金属玻璃中识别出中等范围的L_（12）AlZr_3和C_（11b）CuZr_2 。热处理后，两种金属玻璃在〜（63）Cu NMR第二矩中均显示出相当大的变化，而〜（27）Al NMR第二矩仅显示出相对较小的变化。此外，在Zr_（57）Cu_（20）Al_（10）Ni_8Ti_5中进行热处理后的〜（63）Cu NMR第二矩约为Zr_（59）Cu_（20）Al_（10）Ni_8Ti_3中的一半，表明存在差异热处理过程中的结晶类型。

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