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Cold-temperature deformation of nano-sized tungsten and niobium as revealed by in-situ nano-mechanical experiments
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Seok-Woo Cheng, Yin Tong Greer, Julia R. |
| Copyright Year | 2014 |
| Abstract | 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. |
| Starting Page | 652 |
| Ending Page | 662 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s11431-014-5502-8 |
| Alternate Webpage(s) | http://www.kiss.caltech.edu/papers/titan/papers/cold_temperature.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/s11431-014-5502-8 |
| Volume Number | 57 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
