Nano-subgrain Strengthening in Ball-milled Iron

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The strength and deformation behavior of ball-milled, iron-base materials containing nano-scale subgrains have been evaluated. As reported by several authors, nanosubgrains form during the early stages of ball milling as a result of severe plastic deformation inherent in the ball milling process. The strength for these nano-scale subgrains are compared with the strength of larger-scale subgrains in iron and iron-base alloys produced by traditional mechanical working. The data covers over 2 orders of magnitude in subgrain size (from 30 nm to 6 {micro}m) and shows a continuous pattern of behavior. For all materials studied, the strength varied as {lambda}{sup -1}, ... continued below

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PDF-file: 14 pages; size: 0.8 Mbytes

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Lesuer, D R; Syn, C K & Sherby, O D March 23, 2006.

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Description

The strength and deformation behavior of ball-milled, iron-base materials containing nano-scale subgrains have been evaluated. As reported by several authors, nanosubgrains form during the early stages of ball milling as a result of severe plastic deformation inherent in the ball milling process. The strength for these nano-scale subgrains are compared with the strength of larger-scale subgrains in iron and iron-base alloys produced by traditional mechanical working. The data covers over 2 orders of magnitude in subgrain size (from 30 nm to 6 {micro}m) and shows a continuous pattern of behavior. For all materials studied, the strength varied as {lambda}{sup -1}, where {lambda} is the subgrain size. Strengthening from subgrains was found to breakdown at a much smaller subgrain size than strengthening from grains. In addition, the ball-milled materials showed significant strengthening contributions from nano-scale oxide particles. Shear bands are developed during testing of ball-milled materials containing ultra-fine subgrains. A model for shear band development in nano-scale subgrains during deformation has also been developed. The model predicts a strain state of uniaxial compression in the shear band with a strain of -1.24. Subgrains are shown to offer the opportunity for high strength and good work hardening with the absence of yield point behavior.

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PDF-file: 14 pages; size: 0.8 Mbytes

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  • Journal Name: Materials Science and Engineering A, vol. 463, N/A, August 15, 2007, pp. 54-60; Journal Volume: 463

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  • Report No.: UCRL-JRNL-220174
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936489
  • Archival Resource Key: ark:/67531/metadc894862

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  • March 23, 2006

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 1:45 p.m.

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Lesuer, D R; Syn, C K & Sherby, O D. Nano-subgrain Strengthening in Ball-milled Iron, article, March 23, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc894862/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.