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首页> 外文期刊>Materials Research Letters >Exceptional nanostructure stability and its origins in the CoCrNi-based precipitation-strengthened medium-entropy alloy
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Exceptional nanostructure stability and its origins in the CoCrNi-based precipitation-strengthened medium-entropy alloy

机译：出色的纳米结构稳定性及其起源于CoCrNi基沉淀强化中熵合金

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摘要

The thermal stability of second-phase nanoparticles plays a critical role in determining the applicability and durability of precipitation-hardened alloys for engineering applications at elevated temperatures. In this work, the temporal evolutions of coherent L1_(2) nanoparticles were quantitatively evaluated in a CoCrNi-based medium-entropy alloy. Our experimental results demonstrated an extraordinarily sluggish coarsening of these nanoparticles as compared to most conventional superalloys. The underlying origins of such remarkable nanostructure stability were further analyzed based on the ripening theories, which could be ascribed to the combined effect of small interfacial energy and slow elemental diffusion.
机译：第二相纳米颗粒的热稳定性在确定沉淀硬化合金在高温下的工程应用中的适用性和耐久性方面起着至关重要的作用。在这项工作中，在基于CoCrNi的中熵合金中定量评估了相干L1_（2）纳米粒子的时间演化。我们的实验结果表明，与大多数常规超级合金相比，这些纳米粒子的增幅非常缓慢。在成熟理论的基础上进一步分析了这种卓越的纳米结构稳定性的潜在根源，这归因于小界面能和缓慢元素扩散的综合作用。

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