Development of Ni-base oxide dispersion strengthened alloys using yttria-stabilised zirconia nanoparticles: powder preparation and spark plasma sintering processing

Abstract

In the present study, nickel-based oxide dispersion strengthened (ODS) alloys were prepared by mechanical alloying (MA) andspark plasma sintering (SPS) using the yttria-stabilised zirconia (YSZ) nanoparticle was used as the oxide additive. Then, the powder samples and consolidated ODS parts were examined using XRD, SEM, and mechanical properties of samples were investigated. The results showed, the lattice strain increases to about 0.461%, indicating that the misalignment density in the particles has risen sharply due to MA. XRD results showed that peak flattening was observed with increasing alloying time to 5 and 10 h. The measured relative density of the parts is 96-98%. The secondary phase in the microstructure was the carbide phase of type M7C3 and MC with an average size mainly less than 5 μm. The highest tensile strength observed in Mo/W containing alloy, which was much higher than conventional alloys such as IN738 and IN939.

The effects of powder size and sintering temperature on the microstructure and properties of modified MA6000 alloy produced by spark plasma sintering

“…The exceptional attributes of the MA6000 alloy indicate it as a strong candidate for use in hightemperature industrial processes, especially as an uncooled turbine blade material [6,7]. Various powder metallurgy (PM) methods have been employed to fabricate the MA6000 alloy, including metal injection moulding (MIM), hot isostatic pressing (HIP), and spark plasma sintering [8][9][10].…”

In Situ Reactive Formation of Mixed Oxides in Additively Manufactured Cobalt Alloy

“…Oxide particles act as stable pinning sites, preventing grain growth at higher temperatures. Traditional approaches for producing an ODS material involve long-duration mechanical alloying combined with powder metallurgy consolidation methods such as spark plasma sintering and hot isostatic pressing [ 7 , 8 , 9 ]. Another process called gas-atomized reactive (GAR) atomization has been employed to form oxide particles within metal powder particles by the controlled introduction of oxygen into the argon gas atomization process [ 10 , 11 , 12 , 13 ].…”