AI 中文总结
研究二维十二边形准晶体在循环驱动下的记忆，通过无热准静态剪切模拟，揭示其在屈服上下的不同记忆特性，解析出局部类相位瓦片重排为基本切换单元及瓦片切换滞后子，阐明其与周期性近似物的差异，将相变自由度与双稳滞后子联系起来。
AI 中文摘要
准晶体处于周期性有序晶体和无序玻璃之间的独特中间地带，是研究无序与机械记忆出现之间相互作用的理想平台。通过无热准静态剪切模拟表明，二维十二边形准晶体在循环驱动下编码并恢复记忆。屈服转变以上，响应不可逆，有持久剪切带和局部转变区域；屈服以下，不同振幅的循环剪切在应力 - 应变响应中产生嵌套滞后环层次结构。通过解析潜在可逆塑性事件，揭示局部类相位瓦片重排为基本切换单元，并识别负责准晶体记忆的瓦片切换滞后子。这种对基本切换单元的微观识别在非晶固体中更具挑战性且常不可能。尽管结构多样，但这些重排具有紧密核心、明显双稳性和埃舍尔比兼容弹性远场。相比之下，准晶体的周期性近似物缺乏循环剪切记忆所需的结构无序和双稳瓦片切换重排，将相变自由度与双稳滞后子联系起来。
英文摘要
Quasicrystals occupy a unique middle ground between periodically ordered crystals and disordered glasses, making them an ideal platform for examining the interplay between disorder and the emergence of mechanical memory. Using athermal quasistatic shear simulations, we show that two-dimensional dodecagonal quasicrystals encode and recover memory under cyclic driving. Above the yielding transition, the response becomes irreversible, characterized by persistent shear bands and locally transformed regions. Below yielding, cyclic shear with varying amplitudes produces a hierarchy of nested hysteresis loops in the stress-strain response characteristic of loop-return point memory. By resolving the underlying reversible plastic events, we reveal localized phason-like tile rearrangements as the elementary switching units and identify tile-switch hysterons responsible for memory in the quasicrystal. Such a microscopic identification of the fundamental switching units is considerably more challenging, and often impossible, in amorphous solids. Despite their structural diversity, these rearrangements share a compact core, sharp bistability, and an Eshelby-compatible elastic far field. In contrast, a periodic approximant of the quasicrystal lacks both the structural disorder and the bistable tile-switch rearrangements required for cyclic-shear memory, linking phason degrees of freedom to bistable hysterons.
Comments24 pages, Main text + Supplementary information
