Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, NY 13902.
Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902.
Proc Natl Acad Sci U S A. 2022 Apr 5;119(14):e2117899119. doi: 10.1073/pnas.2117899119. Epub 2022 Mar 28.
SignificanceDynamically understanding the microscopic processes governing ordering transformations has rarely been attained. The situation becomes even more challenging for nanoscale alloys, where the significantly increased surface-area-to-volume ratio not only opens up a variety of additional freedoms to initiate an ordering transformation but also allows for kinetic interplay between the surface and bulk due to their close proximity. We provide direct evidence of the microscopic processes controlling the ordering transformation through the surface-bulk interplay in Pt-Fe nanoalloys and new features rendered by variations in alloy composition and chemical stimuli. These results provide a mechanistic detail of ordering transformation phenomena which are widely relevant to nanoalloys as chemical ordering occurs in most multicomponent materials under suitable environmental bias.
意义动态理解控制有序转变的微观过程很少能够实现。对于纳米尺度的合金来说，情况变得更加具有挑战性，因为显著增加的表面积与体积比不仅为引发有序转变开辟了各种额外的自由度，而且由于它们的紧密接近，还允许表面和体相之间进行动力学相互作用。我们通过 Pt-Fe 纳米合金中的表面-体相相互作用以及合金成分和化学刺激变化所呈现的新特征，提供了控制有序转变微观过程的直接证据。这些结果提供了有序转变现象的机制细节，这对于纳米合金来说具有广泛的相关性，因为在合适的环境偏置下，大多数多组分材料中都会发生化学有序化。
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