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首页> 外文会议>Bulk metallic glasses >In-Situ Electron Diffraction study of Structural change in the Super-Cooled Liquid Region in Amorphous La-Al-Ni alloy
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In-Situ Electron Diffraction study of Structural change in the Super-Cooled Liquid Region in Amorphous La-Al-Ni alloy

机译：La-Al-Ni非晶态合金超冷液相区结构变化的原位电子衍射研究

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摘要

Atomic structures of an amorphous La sub 55Al sub 25Ni sub 20 alloy in the supercooled liquid state have been inestigated by in-situ electron diffraction using a specimen-heating stage in TEM and the imaging-plate intesity recording. From the analysi of atomic pair distribution functions, changes in interatomic distances and coordination numbers were clearly observed at temperatures in the supercooled liquid state. From the reverse Monte Carlo simulations, structural units typical of the metallic glass structure were found and increased in the supercooled liquid region. In addition, the deformation behavior was investigated using tensile test. The superplastic elongation was confirmed at optimum strain rates in the supercooled liquid region. From the TEM observation of tensile tested specimens with superplastic elongation, beta-La nano precipitates in the amorphous matrix were confimed. The superplasticity in this alloy is thought to originate in viscous flow due to the glassy structure formation but is closely related to an additional flow mode with the microcrystalline precipitation fro mthe amorphous state durin the deformation.
机译：使用TEM中的样品加热台和成像板完整性记录，通过原位电子衍射对处于过冷液态的非晶态La sub 55Al sub 25Ni sub 20合金的原子结构进行了研究。从原子对分布函数的分析，在过冷液态下的温度下，原子间距离和配位数的变化清晰可见。从反向蒙特卡洛模拟中，发现了金属玻璃结构的典型结构单元，并在过冷液体区域增加了这种结构单元。另外，使用拉伸试验研究了变形行为。在过冷液体区域以最佳应变率确认了超塑性伸长。从具有超塑性伸长的拉伸测试样品的TEM观察中，可以确定无定形基体中的β-La纳米沉淀。由于形成玻璃状结构，该合金的超塑性被认为起源于粘性流，但与附加流动模式密切相关，该附加流动模式具有非晶态和变形引起的微晶沉淀。

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