首页|Pulsed electrodeposition of homogenous and heterogeneous solid solution layered structure in high strength nanocrystalline Co - Cu alloys
Pulsed electrodeposition of homogenous and heterogeneous solid solution layered structure in high strength nanocrystalline Co - Cu alloys
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NSTL
A supersaturated solid solution nanostructure of an immiscible Co - Cu system is among the promising nanocrystalline (NC) alloys offering enhanced thermal and mechanical stability. In this paper, experiments were conducted to study the phase transformation and tailoring microstructure from a homogeneous/single-phase to a heterogeneous/dual-phase solid solution layered Co - Cu nanostructure via pulsed electrochemical deposition (PED). The increasing concentration of sodium dodecyl sulfate (SDS) in electrolyte played a crucial role in stabilizing a homogeneous solid solution Co - Cu nanostructure. On the other hand, the opposite approach led to the formation of heterogeneous solid solution Co - Cu alloys in the form of multilayered nanostructure consisting of the primary and secondary solid solution Co - Cu differing in 10-15 at.% Cu. The separation of primary and secondary phase is more prominent with the extended pulsed periods. The mechanical properties of selected single- and dual -phase alloys were investigated through micro-pillar compression, revealing that a combination of a high yield strength and an elevated strain hardening can be achieved in NC materials through a combined solid solution strengthening and hardening through nano-twin (NT).
NSTL
