期刊
NANO LETTERS
卷 10, 期 5, 页码 1774-1779出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl100263p
关键词
Surface energy; displacive transformation; dissipation; twin boundary migration; pseudoelasticity
类别
资金
- NSFC [50771079, 50720145101, 50831004]
- 973 Program of China [2010CB631003]
- 111 Project
- NCET of China
- NSF [CMMI-0728069, DMR-0520020]
- AFOSR [FA9550-08-1-0325]
- ONR [N00014-05-1-0504]
- US-NSF [DMR-0904188]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0728069] Funding Source: National Science Foundation
By molecular dynamics simulations, we demonstrate a new concept for mechanical energy storage and retrieval using surface energy as reservoir in body-centered cubic (bcc) tungsten nanowire, achieving a combination of unique features such as large and constant actuation stress (>3 GPa), exceptionally large actuation strain (>30%) and energy density, and >98% energy storage efficiency. The underlying mechanism is a shear-dominant diffusionless transformation akin to martensitic transformation, but driven by surface rather than bulk free energies, and enabled by motion of coherent twin boundary, whose migration has been shown to possess ultralow friction in bcc metals. Aside from energy storage, such surface-energy driven displacive transformations are important for phase transformation and energy-matter control at the nanoscale.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据