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After Cu (60 keV, D =2×10 17 cm −2 ) and Ni (40 keV, D =5×10 16 cm −2 ) ion implantation and subsequent high-current electron beam (HCEB) treatment, Ti41–V41–Al18 alloy has been investigated. In addition to implanted Cu and Ni ions, high concentration of oxygen of about 14 at% and carbon of about 15 at% were found in the layer of 60 nm. The surface alloy layer was composed of a number of structures: the grains of a dislocation substructure (2×1010 cm−2), the grains with plates, and the grains with a packed martensite. The disorientation of regions was observed. The implanted alloy was found to have a decreased wear ability as well as an increased fatigue limit for cycling loads to 30%. After Cu, Ni implantation and HCEB treatment this fatigue limit increased to 60%, the subsequent furnace annealing increasing it to 90%. Hardness also increased and the value of friction coefficient decreased by a factor of 1.8 after this double implantation and HCEB treatment. |
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