In this investigation copper coated carbon nanotubes (CNTs) were prepared to enhance the interfacial bonding between CNTs and aluminum matrix by the molecular-level mixing process. In optimized plating bath of (1:1) by wt. CNT with Cu, thickness of coated CNTs is reduced to 100 nm to promote uniform distribution of Cu nanoparticle on the surface of pretreated CNTs. The mixing of CNTs was accomp...

Metallic porous microtubes were obtained from commercial wires (200–250 μm diameter) of Cu-65Ni-2Fe, Cu-44Ni-1Mn and Cu-23Ni, alloys (wt. %) by surface oxidation at 1173 K in air, removal of the unoxidized core by chemical etching, and reduction in annealing in the hydrogen atmosphere. Transversal sections of the partially oxidized wires show a porous layered structure, with an external shell o...

The influence of alloying additions on strengthening of high pressure torsion (HPT) processed alloys was investigated using commercially pure Al (Al-1050 alloy) and five Al-(1-3)Mg-(0-4)Cu alloys (in wt%). Microhardness was measured on cross sections. For Al-1050 the microhardness reaches a peak at an effective strain of about 3 and subsequently decreases. The microhardness of Al-Mg-Cu alloys i...

Nucleation and growth kinetics, and age hardening behavior in high strength, low carbon ferrous alloy containing 1.2 wt% copper and a model lloy, Fe–1.2%Cu, have been studied with and without the presence of carbides. It is well known that after austenization and quenching, Cu is retained n solid solution. During subsequent aging, Cu initially appears as a coherent nanometer size spherical prec...

Cu content has been successfully optimized in a thixo-cast and directly aged (T5-treatment) Al–7Si–0.5Mg (wt.%) alloy. Even after the 0.5% addition, plate-like Al2Cu (?’) phases, which contribute to high strengths large plasticity, are precipitated. The formation of fraction Cu-containing brittle phases could be suppressed as well. Then, Al–7Si–0.5Mg–0.5Cu alloy exhibits ultimate tensile streng...

We studied nucleation and growth of Ag precipitates in a Cu-6 wt%Ag-0.15 wt%Sc alloy found that the early was similar to continuous precipitation it occurred only on dislocations within Cu grains, not any grain boundaries. In aged samples, we observed stacking faults extended into nanotwins. These planar defects formed during surrounding matrix. The formation released misfit strain Cu/Ag interf...

Abstract To manifest the effect of hard magnetic Ba 0.5 Sr Fe 12 O 19 nanoparticles on mechanical performance (Bi,Pb)-2223 superconducting phase, nano-(Ba ) x /Bi 1.8 Pb 0.4 2 Ca Cu 3.2 10+δ , with = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.10, and 0.20 wt%, were synthesized using a conventional solid-state reaction method. The X-ray diffraction (XRD) data revealed that adding to host phase preser...