期刊
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
卷 57, 期 4, 页码 652-662出版社
SCIENCE PRESS
DOI: 10.1007/s11431-014-5502-8
关键词
dislocation; plasticity; metal; nanopillar; cryogenics
资金
- Kavli Nanoscience Institute (KNI)
- Keck Institute for Space Studies at Caltech
- JRG's NASA Early Career grant
- Caltech SURF program
We constructed and developed an in-situ cryogenic nanomechanical system to study small-scale mechanical behavior of materials at low temperatures. Uniaxial compression of two body-centered-cubic (bcc) metals, Nb and W, with diameters between 400 and 1300 nm, was studied at room temperature and at 165 K. Experiments were conducted inside of a Scanning Electron Microscope (SEM) equipped with a nanomechanical module, with simultaneous cooling of sample and diamond tip. Stress-strain data at 165 K exhibited higher yield strengths and more extensive strain bursts on average, as compared to those at 298 K. We discuss these differences in the framework of nano-sized plasticity and intrinsic lattice resistance. Dislocation dynamics simulations with surface-controlled dislocation multiplication were used to gain insight into size and temperature effects on deformation of nano-sized bcc metals.
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