Plastic deformation induced strong and stable nanograined face-centered cubic Co
收藏中国科学院兰州化学物理研究所科学数据中心2025-12-18 更新2026-01-10 收录
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资源简介：
Face-centered cubic (FCC) Co has been confirmed to exhibit excellent magnetic and catalytic properties as well as
mechanical properties. However, its lattice structure is metastable at room temperature. In the present study, by
using an accumulative high-pressure torsion treatment, a strong and stable nanograined FCC Co was generated
through allotropic transformation coupled with mechanical relaxation processes. As the grain size of Co was
refined to about 11 nm, HCP-FCC phase transformation was activated and formation of almost 100% nano
grained FCC Co. This phase transformation was through twin faults generation on every (0001) plane contin
uously. The nanograined FCC Co shows superior thermal stability both in grain size and lattice structure. After
annealing at 973 K for 30 min, no obvious grain coarsening or reverse phase transformation was observed. High
density stacking faults and twins in the nanograined FCC Co were formed by emitting partial dislocations from
grain boundaries (GBs), which may relax the GBs and improve the thermal stability. The nanograined FCC Co
with an average grain size of 11 nm exhibited a hardness of 7.98 GPa, showing a good combination of high
strength and excellent thermal stability.
提供机构：
中国科学院兰州化学物理研究所科学数据中心
创建时间：
2025-12-18
