期刊
NATURE MATERIALS
卷 19, 期 7, 页码 712-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41563-020-0645-4
关键词
-
类别
资金
- National Science Foundation of China [51831003, 51527801]
- Funds for Creative Research Groups of China [51921001]
- 111 project [B170003]
- Fundamental Research Funds for the Central Universities [06111020, 06111040]
- fundamental research fund at the State Key Laboratory for Advanced Metals and Materials [2017Z-09]
- Swedish Research Council [2017-06474]
- Hungarian Scientific Research Fund [OTKA 128229]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- US Department of Energy, Office of Science, Office of Basic Energy Science [DE-AC02-06CH11357]
Superelasticity associated with the martensitic transformation has found a broad range of engineering applications(1,2). However, the intrinsic hysteresis(3) and temperature sensitivity(4) of the first-order phase transformation significantly hinder the usage of smart metallic components in many critical areas. Here, we report a large superelasticity up to 15.2% strain in [001]-oriented NiCoFeGa single crystals, exhibiting non-hysteretic mechanical responses, a small temperature dependence and high-energy-storage capability and cyclic stability over a wide temperature and composition range. In situ synchrotron X-ray diffraction measurements show that the superelasticity is correlated with a stress-induced continuous variation of lattice parameter accompanied by structural fluctuation. Neutron diffraction and electron microscopy observations reveal an unprecedented microstructure consisting of atomic-level entanglement of ordered and disordered crystal structures, which can be manipulated to tune the superelasticity. The discovery of the large elasticity related to the entangled structure paves the way for exploiting elastic strain engineering and development of related functional materials. NiCoFeGa single crystals exhibit large non-hysteretic superelasticity over broad temperature and composition ranges. It is attributed to the continuous phase transition with applied stress, which is related to the fluctuation of entangled ordered and disordered crystal structures.
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