The effect of the amount of Y2O3 doped to the MA6000 alloy produced by mechanical alloying method on wear behavior

Abstract

This paper investigated the wear performances of Y2O3 doped MA6000 (Ni-Cr-Al) alloy produced by mechanical alloying (MA). Produced, all powders were pre-formed by cold pressing and sintered in a vacuum environment. Sintered MA6000-X% Y2O3 superalloys were characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis, density, and hardness measurements. Wear tests of Y2O3 added MA6000 alloys were carried out in a block-on-ring type wear device. In the wear tests, the sliding speed of 1 ms-1 at room temperature (RT) was performed under five different sliding distances (200-1000m) and three different loads (5 N, 10 N, and 15 N). As a result of the studies, it was determined that the MA?ed MA6000 superalloy powders were homogeneous and flake shape. With the increase amount of Y2O3, hardness of these superalloys increased from 267 to 431 Hv, but the density slightly decreased. Different intermetallic/carbur phases such as Ni3Al, MoC are observed in all compositions. Wear tests show that weight loss and wear rate decreased, and friction coefficient (?) increased with the increasing amount of Y2O3 additive. Besides, it was determined that as the applied load increased in the wear test, the weight loss increased, but the wear rate and friction coefficient (?) decreased.

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

“…MA6000 alloy is an austenitic Ni-based superalloy, reinforced by oxide dispersion strengthening (ODS) and γ’-phase precipitation hardening via mechanical alloying [1–3]. The addition of refractory elements, such as Cr, W, and Ta, to the Ni matrix, imparts remarkable features to the MA6000 alloy, including high creep and rupture resistance and excellent sulfidation and corrosion resistance, particularly when operating in high-temperature and ambient environments [2,4,5]. The exceptional attributes of the MA6000 alloy indicate it as a strong candidate for use in high-temperature industrial processes, especially as an uncooled turbine blade material [6,7].…”