Early crystallization stages in a Zr–Cu–Ni–Al–Ti metallic glass
Early crystallization stages in a Zr–Cu–Ni–Al–Ti metallic glass
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DOI：
10.1016/j.actamat.2005.01.022
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发表时间：
2005-04
期刊：
影响因子：
9.4
通讯作者：
A. Kündig;M. Ohnuma;T. Ohkubo;K. Hono
中科院分区：
文献类型：
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作者：
A. Kündig;M. Ohnuma;T. Ohkubo;K. Hono
采用差示扫描量热法（DSC）、高分辨电子显微镜（HREM）、三维原子探针（3dp）和小角x射线散射（SAXS）研究了不同杂质氧浓度zr52.5 cu17.9 ni14.6 al10ti5金属玻璃的早期结晶阶段。在稍高于玻璃化转变温度的等温DSC中，低氧样品有两个峰，高氧样品有一个峰。在过冷液体中，没有检测到先前报道的相分离的证据；只有通过HREM确认纳米晶体后，才能检测到SAXS和3ddap的成分对比。低氧样品形成细小的富钛纳米晶，然后结晶为贫钛的nizr2相，高氧样品结晶为极细的niti2型大立方相。
The early crystallization stages of Zr52.5Cu17.9Ni14.6Al10Ti5metallic glass with different impurity oxygen levels were investigated with differential scanning calorimetry (DSC), high resolution electron microscopy (HREM), three-dimensional atom probe (3DAP) and small angle X-ray scattering (SAXS). While the low oxygen sample showed two peaks, the high oxygen sample showed one peak in isothermal DSC slightly above the glass transition temperatures. No evidence for the previously reported phase separation was detected in the supercooled liquid by 3DAP; compositional contrasts in SAXS and 3DAP were detected only when nanocrystals were confirmed by HREM. The low oxygen sample forms fine Ti-enriched nanocrystals and then crystallizes into Ti-poor NiZr2-phase, the high oxygen sample crystallizes into very fine NiTi2-type big cube phase.