Dislocation nucleation in bcc Ta single crystals studied by nanoindentation

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The study of dislocation nucleation in closed-packed metals by nanoindentation has recently attracted much interest. Here, we address the peculiarities of the incipient plasticity in body centered cubic (bcc) metals using low index Ta single-crystals as a model system. The combination of nanoindentation with high-resolution atomic force microscopy provides us with experimental atomic-scale information on the process of dislocation nucleation and multiplication. Our results reveal a unique deformation behavior of bcc Ta at the onset of plasticity which is distinctly different from that of closed-packed metals. Most noticeable, we observe only one rather than a sequence of discontinuities in the ... continued below

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Biener, M M; Biener, J; Hodge, A M & Hamza, A V August 8, 2007.

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The study of dislocation nucleation in closed-packed metals by nanoindentation has recently attracted much interest. Here, we address the peculiarities of the incipient plasticity in body centered cubic (bcc) metals using low index Ta single-crystals as a model system. The combination of nanoindentation with high-resolution atomic force microscopy provides us with experimental atomic-scale information on the process of dislocation nucleation and multiplication. Our results reveal a unique deformation behavior of bcc Ta at the onset of plasticity which is distinctly different from that of closed-packed metals. Most noticeable, we observe only one rather than a sequence of discontinuities in the load-displacement curves. This and other differences are discussed in context of the characteristic plastic deformation behavior of bcc metals.

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PDF-file: 21 pages; size: 0.6 Mbytes

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  • Journal Name: Physical Review B, vol. 76, N/A, October 18, 2007, pp. 165422; Journal Volume: 76

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  • Report No.: UCRL-JRNL-233794
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 928176
  • Archival Resource Key: ark:/67531/metadc898324

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  • August 8, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 4:05 p.m.

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Biener, M M; Biener, J; Hodge, A M & Hamza, A V. Dislocation nucleation in bcc Ta single crystals studied by nanoindentation, article, August 8, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898324/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.