Solute distribution in nanocrystalline Ni–W alloys examined through atom probe tomography
Solute distribution in nanocrystalline Ni–W alloys examined through atom probe tomography
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DOI：
10.1080/14786430600726749
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发表时间：
2006-10
影响因子：
1.6
通讯作者：
A. Detor;Michael K Miller;Christopher A. Schuh
中科院分区：
文献类型：
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作者：
A. Detor;Michael K Miller;Christopher A. Schuh
采用原子探针层析技术对3、10、20 nm三种不同晶粒尺寸的Ni-W纳米合金中溶质分布进行了观察，并与原子模拟结果进行了比较。通过对实验和模拟结构中成分波动的详细分析，证实了晶界偏析的存在，并通过频率分布分析量化了其程度。与先前通过原子探针层析成像检测的其他纳米晶合金（如Ni-P）相比，目前的纳米晶Ni-W合金在晶间区域仅表现出微量的溶质偏析。
Atom probe tomography is used to observe the solute distribution in electrodeposited nanocrystalline Ni–W alloys with three different grain sizes (3, 10 and 20 nm) and the results are compared with atomistic computer simulations. The presence of grain boundary segregation is confirmed by detailed analysis of composition fluctuations in both experimental and simulated structures, and its extent quantified by a frequency distribution analysis. In contrast to other nanocrystalline alloys previously examined by atom probe tomography, such as Ni–P, the present nanocrystalline Ni–W alloys exhibit only a subtle amount of solute segregation to the intergranular regions.