J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (10): 1018-1026.DOI: 10.1016/j.jmst.2015.08.010

• Orginal Article • Previous Articles     Next Articles

Cell Wall Buckling Mediated Energy Absorption in Lotus-type Porous Copper

Weidong Li1, 2, *, Haoling Jia1, Chao Pu1, Xinhua Liu2, Jianxin Xie2, *   

  1. 1 Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;
    2 Key Laboratory of Advanced Materials Processing, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2015-04-12 Revised:2015-06-15
  • Contact: * Corresponding authors. Ph.D.; Tel.: +1 865 2087040; Fax: +1 865 9744115.E-mail addresses: wli20@utk.edu (W. Li); jxxie@mater.ustb.edu.cn (J. Xie).
  • Supported by:
    The authors acknowledge financial support from the National Natural Science Foundation of China (Grant No. 50904004).

Abstract: The energy absorption characteristics of the lotus-type porous coppers at the strain rate of 10-3s-1 to ~2400s-1 were systematically investigated. Depending on the relative density and loading rate, the energy absorption capability of the tested samples varied from ~20 to ~85MJm-3, while the energy absorption efficiency fluctuated around ~0.6. An energy absorption efficiency curve based approach was proposed for unambiguous identification of the plateau regime, which gave an extension of ~0.50 strain range for the presently investigated porous coppers. With detailed observations of cell wall morphologies at various deformation stages, it was suggested that buckling of cell walls was the dominant mechanism mediating the energy absorption in lotus-type porous coppers.

Key words: Porous copper, Plateau regime, Strain rate sensitivity, Energy absorption, Buckling