Size and Interface Coherency Dependent Phase Transformation of Niobium Nanoparticles Embedded in Copper Matrix by Mechanical Alloying

Abstract:

The object of this work is to investigate the interface and size effects on the structural phase transition of Nb nanoparticles (NPs) embedded in Cu matrix. By means of X-ray diffraction analysis and high-resolution transmission electron microscopy observation, it is found that higher coherency of the Cu/Nb interface benefits the occurrence of phase transition in Nb NPs with larger sizes. The sufficient conditions for the transition are: (1) the size of Nb NPs should be smaller than 8 nm; (2) the Cu/Nb interfaces should be semi-coherent or coherent. The experimental results are consistent with the predictions of Bond Energy model.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 243-248
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.243
• Online since: December 2012
• Authors: Ruo Shan Lei, Shi Qing Xu, Ming Pu Wang, Ye Jun Li, Wei Hong Qi
• Keywords: Allotropic Transformation, Cohesive Energy, Cu-Nb Alloy, Mechanical Alloying, Size Dependence

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