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Volume 24 - December 1999

Contents

Page 9 of 13

MRS News

  • MRS Elects Officers, Councillors for 2000

  • Published online by Cambridge University Press:
    29 November 2013, pp. 64-66
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International Union of Materials Research Societies

  • IUMRS-ICAM'99 Presents Symposia and Forums on Advanced Materials

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    29 November 2013, pp. 62-63
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  • MRS-I Features Building Materials at 10th Annual General Meeting

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    29 November 2013, p. 60
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Profiles & Perspectives

  • Sizing Up the Fermi Surface: Brian Pippard Speaks of Metals, Methods, and Songs

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    29 November 2013, pp. 50-53
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Abstracts

  • What's New With JMR

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    29 November 2013, p. 52
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Education Exchange

  • “Bring a Kid to Lab Day” Features Slime Creatures and a Shape Memory Alloy

  • Jane Slezak
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    29 November 2013, p. 51
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Mechanical Behavior of Nanostructured Materials

  • Ductility of Nanostructured Materials

  • C.C. Koch, D.G. Morris, K. Lu, A. Inoue
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    29 November 2013, pp. 54-58

  • Ductility is defined as the ability of a material to change shape without fracture. It is of critical importance for engineering materials for both manufacturability and Performance. Measures of ductility include percent elongation (uniform plastic flow prior to mechanical instability—necking—or fracture) and percent reduction in area. Fracture toughness is also some measure of potential ductility. Engineering materials exhibit wide variations in ductility which can often limit their application.

    Ductility is a property of nanocrystalline materials which might be predicted to be enhanced by extrapolation of its grain-size dependence in conventional polycrystalline materials. It has been predicted that extrapolation of the grain size, or the scale of the microstructure, to the nanoscale will lead to both strengthening and an increase in ductility. As far as failure and ductility are concerned, this idea is based on experience with conventional materials, where the yield and fracture stress show different dependencies on the grain size. The fracture stress typically increases faster than the yield stress with decreasing grain size such that ductile/brittle transitions can occur. For example, the ductile / brittle transition temperature in mild steel can be lowered about 40°C by reducing the grain size by a factor of five. In terms of how ductility may be affected by the extreme grainsize reduction to the nanoscale, we consider the following. Firstly, it may be recalled that obtaining ductility relies simply on plastic deformation occurring without the catastrophic onset of failure mechanisms, and therefore we can examine possibilities of changing ductility in terms of avoiding failure.

MRS News

  • MRS Spring 1999 Meeting Features Soft, Magnetic, and Display Materials, Among Other Interdisciplinary Research Topics

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    29 November 2013, pp. 50-65
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News

  • Classified

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    29 November 2013, pp. 53-55
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MRS News

  • Gibala Leads Executive Committee in 1999

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    29 November 2013, pp. 56-58
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Other

  • Advertisers in This Issue

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    29 November 2013, p. 66
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MRS News

  • Balazs, Hwang, Jones, and Ross to Chair MRS Spring 2000 Meeting

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    29 November 2013, pp. 61-62
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News

  • Classified

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    29 November 2013, pp. 77-79
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MRS News

  • MRS Seeks Nominees for Outstanding Young Investigator Award, 2000

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    29 November 2013, pp. 61-63
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  • MRS Featured Volunteer

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    29 November 2013, p. 64
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  • Plenary Speaker Gargini to Address Materials and the Semiconductor Industry

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    29 November 2013, p. 81
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  • Preview: 1999 MRS Spring Meeting

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    29 November 2013, pp. 59-71
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Historical Note

  • Amontons' Rules of Friction Formulated 300 Years Ago

  • Irwin L. Singer
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    29 November 2013, p. 52
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Abstracts

  • Abstracts for August 1999 Journal of Materials Research

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    29 November 2013, pp. 66-73
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  • Abstracts for September 1999 Journal of Materials Research

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    29 November 2013, pp. 54-61
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Page 9 of 13