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中文摘要：
利用原位XAFS技术研究了在273K下化学还原法制备Ni70B30纳米非晶态合金的升温晶化过程．结果表明，NiB初始样品中存在Ni和B原子的局部富集，Ni原子的局域结构类似于非晶态Ni，并且Ni原子第一近邻B原子的平均配位数只有0．7左右，远低于其化学计量比7：3应有的配位数3．6．在升温至498K时，部分NiB开始晶化生成fcc-Ni;在523～598K温度范围内，NiB晶化比例随着温度的升高呈线性增加；在温度高于598K时，NiB纳米非晶态合金的晶化基本完成．
英文摘要：
In-situ XAFS was used to study the crystallization mechanism of Ni70B30 nano-amorphous alloys prepared by chemical reduction at 273 K. The result indicates that the as-prepared sample is in the state of an amorphous Ni-like structure with nickel-rich and boron-rich regions. The coordination number N in the first shell Ni-B is only 0. 7, much less than the value （3.6） predicted by the atomic composition of 7：3. From the XANES and radial distribution function analyses, crystallization of the as-prepared sample to fcc- Ni starts at the treatment temperature of 498 K and increases with temperature. Above 598 K, the crystallization of NiT0 Ba0 sample has almost finished. Only the phase of crystalline fcc-Ni is formed in the whole thermal treatment process.
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