Metallurgical and Materials Transactions A

, Volume 46, Issue 12, pp 5671–5684 | Cite as

Size Effects on Strength in the Transition from Single-to-Polycrystalline Behavior

Article

Abstract

During the transition from single crystalline to polycrystalline behavior, the available data show the strength increasing or decreasing as the number of grains in a cross section is reduced. Tensile experiments were conducted on polycrystalline Ni with grain sizes (d) between 16 and 140 μm and varying specimen thickness (t), covering a range of λ (=t/d) between ~0.5 and 20. With a decrease in λ, the data revealed a consistent trend of strength being independent of λ at large λ, an increase in strength, and then a decrease in strength. Microstructural studies revealed that lower constraints enabled easier rotation of the surface grains and texture evolution, independent of the specimen thickness. In specimen interiors, there was a greater ease of rotation in thinner samples. Measurements of misorientation deviations within grains revealed important differences in the specimen interiors. A simple model is developed taking into account the additional geometrically necessary dislocations due to variations in the behavior of surface and interior grains, leading to additional strengthening. A suitable combination of this strengthening and surface weakening can give rise to wide range of possibilities with a decrease in λ, including weakening, strengthening, and strengthening and weakening.

Supplementary material

11661_2015_3174_MOESM1_ESM.doc (1.7 mb)
Supplementary material 1 (DOC 1734 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  1. 1.Erich Schmid Institute of Materials ScienceLeobenAustria
  2. 2.Department of Materials EngineeringIndian Institute of ScienceBangaloreIndia

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