• Peikrishvili, A.
• Mamniashvili, G.
• Aydinyan, S. V.
• Godibadze, B.
• Chagelishvili, E. Sh.
• Kirakosyan, H. V.
• Lesuer, D. R.
• Zakaryan, M. K.
• Abovyan, L. S.
• Kharatyan, S. L.
• Gutierrez, M.

Abstract

<jats:p>Manufacturing W-Cu composite nanopowders was performed via joint reduction of CuO and WO3 oxides with various ratios (W:Cu = 2:1, 1:1, 1:3, 1:13.5) using combined Mg–C reducer. Combustion synthesis was used to synthesize homogeneous composite powders of W-Cu and hot explosive consolidation (HEC) technique was utilized to fabricate dense compacts from ultrafine structured W-Cu powders. Compact samples obtained from nanometer sized SHS powders demonstrated weak relation between the susceptibility and the applied magnetic field in comparison with the W and Cu containing micrometer grain size of metals. The density, microstructural uniformity and mechanical properties of SHS&amp;HEC prepared samples were also evaluated. Internal friction (Q-1) and Young modulus (E) of fabricated composites studied for all samples indicated that the temperature 1000 °С is optimal for full annealing of microscopic defects of structure and internal stresses. Improved characteristics for Young modulus and internal friction were obtained for the W:Cu = 1:13.5 composite. According to microhardness measurement results, W-Cu nanopowders obtained by SHS method and compacted by HEC technology were characterized by enhanced (up to 85%) microhardness.</jats:p>

Topics

• nanocomposite
• density
• impedance spectroscopy
• grain
• grain size
• combustion
• defect
• annealing
• susceptibility