Lee, Seok-Woo and Cheng, YinTong and Ryu, Ill and Greer, Julia R. (2014) Cold-temperature deformation of nano-sized tungsten and niobium as revealed by in-situ nano-mechanical experiments. Science China Technological Sciences, 57 (4). pp. 652-662. ISSN 1674-7321. doi:10.1007/s11431-014-5502-8. https://resolver.caltech.edu/CaltechAUTHORS:20140603-101604423
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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.
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Additional Information: | © 2014 Science China Press and Springer-Verlag Berlin Heidelberg. Received February 2, 2014; accepted February 28, 2014. The authors gratefully acknowledge the financial support of the Kavli Nanoscience Institute (KNI) through LEE Seok-Woo’s prized post-doctoral fellowship, of the Keck Institute for Space Studies at Caltech, and of JRG’s NASA Early Career grant. CHENG YinTong acknowledges the financial support of the Caltech SURF program. | ||||||||||||
Group: | Kavli Nanoscience Institute, Keck Institute for Space Studies | ||||||||||||
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Subject Keywords: | dislocation, plasticity, metal, nanopillar, cryogenics | ||||||||||||
Issue or Number: | 4 | ||||||||||||
DOI: | 10.1007/s11431-014-5502-8 | ||||||||||||
Record Number: | CaltechAUTHORS:20140603-101604423 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140603-101604423 | ||||||||||||
Official Citation: | Lee S W, Cheng Y T, Ryu I, et al. Cold-temperature deformation of nano-sized tungsten and niobium as revealed by in-situ nano-mechanical experiments . Sci China Tech Sci, 2014, 57: 652-662, doi: 10.1007/s11431-014-5502-8 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 46044 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | Tony Diaz | ||||||||||||
Deposited On: | 03 Jun 2014 20:48 | ||||||||||||
Last Modified: | 10 Nov 2021 17:19 |
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