观察脱离边界-重组阶段竞争的原子位移转变

Qingqi Zeng, Zhiwei Du, Xiaolei Han, Binbin Wang, Guangheng Wu, Enke Liu
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引用次数: 0

摘要

在相变过程中,不同的状态会随着临界竞争产生的多重现象而演变。实验和理论计算表明,母相在接近相界时变得越来越不稳定。实验和理论计算表明,母相在接近相界时变得越来越不稳定,具有中等一阶性质的晶格扭曲转变由于来自结构挫折的临界相竞争而存活下来,在这种临界状态下,不同相的可比能量和形成偏好降低。在这种临界状态下,包括马氏体相变在内的相选择可以通过快速冷却、退火和磁场等外部场来调节。我们的研究揭示了一种稳定母相的新方法,通过这种方法可以获得基于相变的新型功能材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observation of atomically displacive transformation out of the boundary-reconstructive phase competition
During the phase transitions, diverse states evolve with multiplex phenomena arising from the critical competition. In this study, a displacive martensitic transformation with a lattice shear distortion was unexpectedly observed at the reconstructive phase boundary that usually connects multiple phases without crystallographic relation, in a Ni-Co-Mn-V all-d-metal alloy system. Experiments and theoretical calculations suggest that the parent phase becomes increasingly unstable when approaching the phase boundary. The lattice-distorted transformation with moderate first-order nature survives due to the critical phase competition from the structural frustration, in which the comparable energy and the diminished formation preference of different phases emerge. In this critical state, the phase selection including the martensitic phase transformation can be tuned by external fields such as rapid cooling, annealing and magnetic field. Our research reveals a novel manner to destabilize the parent phase, through which one could attain new functional materials based on the phase transitions.
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