Grain Size Distribution Effect on Mechanical Behavior of Nanocrystalline Materials


Grain size distribution effect on the mechanical behavior of NiTi and Vitroperm alloys were investigated. Yielding at significantly lower stresses than found in equiaxed counterparts, along with well defined strain hardening was observed in these nanocrystalline materials with large grains embedded in the matrix during tensile deformation at temperatures of 0.4Tm. At higher temperature the effect of grain size distribution on yield stress was not revealed while plasticity was increased in 50% in NiTi alloy with bimodal grain size structure.

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The authors would like to acknowledge the National Science Foundation, Division of Materials Research for its financial support under grant NSF-DMR-0240144.

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Sergueeva, A., Mara, N. & Mukherjee, A. Grain Size Distribution Effect on Mechanical Behavior of Nanocrystalline Materials. MRS Online Proceedings Library 821, 336–342 (2004).

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