Effect of Copper Addition on Mechanical Properties of Nanostructured Pb_1-xCu_xTe Thermoelectric Alloy Systems by Nanoindentation

Abstract:

The mechanical properties of sintered nanostructured Pb_1-xCu_xTe (0 ≤ x ≤ 0.2) alloy systems were investigated using nanoindentation technique. The powder precursors of the designed systems were prepared by ball milling technique and sintered by hot isostatic pressing. Cu acts as a dopant in these alloy systems, and an increase in its concentration, up to x = 0.1, leads to a more dense and refined nanostructure along with enhancements in both hardness and Young’s modulus. The Cu addition caused an apparent embrittlement in the materials, and spalling of the materials was recognized when x exceeded 0.15. These results imply that design parameters of complex mechanical environments under thermal shocks and vibrations cannot be determined only in terms of hardness and Young’s modulus of thermoelectric systems like Pb_1-xCu_xTe alloys.

• Periodical: Key Engineering Materials (Volume 735)
• Pages: 205-209
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.735.205
• Online since: May 2017
• Authors: Mohamed Abd El Naser Mansour*, Ahmed Abd El-Moneim, Koichi Nakamura
• Keywords: Cu, Hardness, Nanoindentation, PbTe, Thermoelectric, Young’s Modulus

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