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The effect of grain size distribution on mechanical properties of nanometals

Thomas B. Tengen 3,  Tomasz Wejrzanowski 1,2,  Radosław Iwankiewicz 4,  Krzysztof J. Kurzydlowski 1,2

1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
2. Interdisciplinary Centre for Materials Modelling (ICMM), Woloska 141, Warszawa 02-507, Poland
3. University of Witwatersrand (WITS), Private Bag 3, WITS 2050, Johannesburg 2001, South Africa
4. Institue of Mechanics and Ocean Engineering, Hamburg University of Technology, Eissedorfer Strasse 42, Hamburg D-21073, Germany

Abstract

Predicting material properties from the knowledge of the internal microstructures is attracting some interest in the fields of Materials Design and Engineering. The most commonly used equation known as Hall-Petch Relationship (HPR) deals with the relationship between flow stress and average grain size. On the other hand, there are many evidences that other statistical quantities of grain size distribution in materials may have impacts on the mechanical properties. These could even be more pronounced in the case of grains of the nanometer size, where the HPR is not valid anymore and the Reverse-HPR is applicable.

 In the present paper, the statistical model of the relationship between the flow stress and grain size distribution is proposed. The model considers different deformation mechanisms and may be applied to nanometals.

The results obtained with the model shows that the dispersion of grain size distribution plays an important role in the design of desirable mechanical properties.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Acta Materialia Gold Medal Workshop, by Tomasz Wejrzanowski
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-06-15 11:40
Revised:   2009-06-07 00:44