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The influence of oxygen contamination on the thermal stability and hardness of nanocrystalline Ni-W alloys

机译：氧污染对纳米晶Ni-W合金热稳定性和硬度的影响

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摘要

Nanocrystalline Ni-W alloys are reported in the literature to be stabilized against high temperature grain growth by W-segregation at the grain boundaries. However, alternative thermal stability mechanisms have been insufficiently investigated, especially in the presence of impurities. This study explored the influence of oxygen impurities on the thermal stability and mechanical properties of electrodeposited Ni-23 at% W with aberration-corrected scanning transmission electron microscopy (STEM) and na-noindentation hardness testing. The primary finding of this study was that nanoscale oxides were of sufficient size and volume fraction to inhibit grain growth. The oxide particles were predominantly located on grain boundaries and triple points, which strongly suggests that a particle drag mechanism was active during annealing. In addition, W-segregation was observed at the oxide/Ni(W) interfaces rather than the presumed Ni(W) grain boundaries, further supporting the argument that alternative mechanisms are responsible for thermal stability in these alloys. Lastly, alloys with nanoscale oxides exhibited a higher hardness compared to similar alloys without oxides, suggesting that the particles are widely advantageous. Overall, this work demonstrates that impurity oxide particles can limit grain growth, and alternative mechanisms may be responsible for Ni-W thermal stability.
机译：在文献中报道了纳米晶Ni-W合金通过在晶界处的W偏析而稳定以抵抗高温晶粒生长。但是，尚未充分研究替代的热稳定性机制，尤其是在存在杂质的情况下。本研究通过像差校正扫描透射电子显微镜（STEM）和钠硬度测试，探讨了氧杂质对电沉积Ni-23 at％W的热稳定性和机械性能的影响。这项研究的主要发现是纳米级氧化物具有足够的尺寸和体积分数来抑制晶粒的生长。氧化物颗粒主要位于晶界和三点上，这强烈暗示了在退火过程中颗粒阻力机制是活跃的。此外，在氧化物/ Ni（W）界面而不是假定的Ni（W）晶界处观察到W偏析，进一步支持了论点，即这些合金的热稳定性起着替代机制的作用。最后，与不含氧化物的类似合金相比，具有纳米氧化物的合金具有更高的硬度，这表明该颗粒具有广泛的优势。总的来说，这项工作表明，杂质氧化物颗粒可以限制晶粒的生长，并且其他机制可能是造成Ni-W热稳定性的原因。

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