TITLE

On the origin of ultrahigh cryogenic strength of nanocrystalline metals

AUTHOR(S)
Wang, Y. M.; Ma, E.
PUB. DATE
October 2004
SOURCE
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2750
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
At liquid nitrogen temperature, the yield strength of nanocrystalline Ni and Co increases by as much as 50%–80% over the already-impressive (∼1 GPa) room-temperature values. This unusual strength ratio as well as the remarkable magnitude of flow stress reached (as high as 2.5 GPa) are unexpected for conventional close-packed pure metals. The strong temperature dependence is attributed to the unusually small activation volume measured in strain rate change tests. Grain boundary dislocation nucleation is proposed as the thermally activated deformation mechanism in nanocrystalline grains.
ACCESSION #
14713398

 

Related Articles

  • Deformation defects in nanocrystalline nickel. Wu, Xiaolei; Ma, En; Zhu, Y. T. // Journal of Materials Science;Mar2007, Vol. 42 Issue 5, p1427 

    Defects induced by plastic deformation in electrodeposited, fully dense nanocrystalline (nc) Ni with an average grain size of 25 nm have been characterized by means of high resolution transmission electron microscopy. The nc Ni was deformed under uniaxial tension at liquid-nitrogen temperature....

  • Liquid Nitrogen (Oxygen Simulant) Thermodynamic Vent System Test Data Analysis. Hedayat, A.; Nelson, S. L.; Hastings, L. J.; Flachbart, R. H.; Tucker, S. P. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p232 

    In designing systems for the long-term storage of cryogens in low-gravity (space) environments, one must consider the effects of thermal stratification on tank pressure that will occur due to environmental heat leaks. During low-gravity operations, a Thermodynamic Vent System (TVS) concept is...

  • CRYOGENIC SYSTEM FOR A 35 KV/90 MVA SATURATED IRON-CORE SUPERCONDUCTING FAULT CURRENT LIMITER. Hong, H.; Gong, W. Z.; Tian, B.; Zhang, J. Y.; Hu, X. M.; Wang, J. Z.; Niu, X. Y.; Wang, Y.; Zhang, L. F.; Sun, Y. W.; Wu, T. Q.; Xin, Y. // AIP Conference Proceedings;4/9/2010, Vol. 1218 Issue 1, p1395 

    A cryogenic system was built as an open system for a 35 kV/90 MVA saturated iron-core superconducting fault current limiter. It consists of an annular cylindrical liquid nitrogen dewar, cryogenic pipes, sensors, valves, and a control unit. A HTS dc bias coil was immersed with liquid nitrogen in...

  • Cryogenic gas target system for intense RI beam productions in nuclear astrophysics. Wakabayashi, Y.; Yamaguchi, H.; Hayakawa, S.; Kurihara, Y.; Amadio, G.; Fujikawa, H.; Binh, D. N.; He, J. J.; Kim, A.; Kubono, S. // AIP Conference Proceedings;5/21/2008, Vol. 1016 Issue 1, p442 

    A cryogenic gas target system was newly developed to produce intense RI beams at the low-energy in-flight radio-isotope beam separator (CRIB) of the University of Tokyo. The main features of the cryogenic gas target system are the direct cooling of the target cell by a liquid N2 finger and the...

  • Design Optimization of Liquid Nitrogen Based IQF Tunnel. Datye, A. B.; Narayankhedkar, K. G.; Sharma, G. K. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p171 

    A design methodology for an Individual Quick Freezing (IQF) tunnel using liquid nitrogen is developed and the design based on this methodology is validated using the data of commercial tunnels. The design takes care of heat gains due to the conveyor belt which is exposed to atmosphere at the...

  • Information specific to liquid nitrogen.  // Chemical Business;Aug2009, Vol. 23 Issue 8, p58 

    The article offers information on liquid nitrogen. It is inert, cold, colorless, odorless, non-corrosive and nonflammable nitrogen that can be withdrawn as a gas by injecting liquid through a vaporizer. This product is stored in cryogenic containers that are placed in well ventilated areas....

  • Study of heat exchange during discharge of cryogenic products into water. Domashenko, A.; Blinova, I. // Chemical & Petroleum Engineering;Nov2007, Vol. 43 Issue 11/12, p720 

    With the aim of clarifying conditions for dangerous discharge of cryogenic fuels into water in a test unit heat exchange in the area of the discharge pipe, evaporation and heating of vapors during their movement in water are studied. It is established that with continuous outflow of liquid...

  • CRYOGENIC AND ELECTRICAL TEST RESULTS OF 30 M HTS POWER CABLE. Sytnikov, V. E.; Vysotsky, V. S.; Fetisov, S. S.; Nosov, A. A.; Shakaryan, Yu. G.; Kochkin, V. I.; Kiselev, A. N.; Terentyev, Yu. A.; Patrikeev, V. M.; Zubko, V. V. // AIP Conference Proceedings;4/9/2010, Vol. 1218 Issue 1, p461 

    In the framework of the Russian R&D Program for HTS power devices, 3×30 m cable with operating current of ∼1.5–2 kA and operating voltage of 20 kV was delivered by Russian Scientific R&D Cable Institute as the first stage of the HTS power cables project. Different basic HTS...

  • CONSTRUCTION OF A PARA-ORTHO HYDROGEN TEST CRYOSTAT. Essler, J.; Haberstroh, Ch. // AIP Conference Proceedings;4/9/2010, Vol. 1218 Issue 1, p305 

    In a prospective hydrogen economy it is necessary to verify the para concentration of the employed hydrogen. In case of a short storage time of about a few days only it has been shown that a partial conversion into para-hydrogen gives an optimized overall efficiency. Hence, an easy and reliable...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics