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Ohishi, K.
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article
Manufacturing and characterization of Ni-free N-containing ODS austenitic alloy
Abstract
Ni-free N-containing oxide dispersion strengthened (ODS) austenitic alloys were manufactured by mechanicalalloying (MA) followed by spark plasma sintering (SPS). The phase evolutions during millingunder a nitrogen atmosphere and after sintering were studied by X-ray diffraction (XRD). Transmissionelectron microcopy (TEM) and alloy contrast variation analysis (ACV), including small-angle neutronscattering (SANS) and ultra-small-angle X-ray scattering (USAXS), revealed the existence of nanoparticleswith a diameter of 3e51 nm for the samples sintered at 950 C. Sintering at 1000 C for 5 and 15 mincaused slight growth and a significant coarsening of the nanoparticles, up to 70 nm and 128 nm,respectively. The ACV analysis indicated the existence of two populations of Y2O3, ε-martensite and MnO.The dispersive X-ray spectrometry (EDS) confirmed two kinds of nanoparticles, Y2O3 and MnO. Thematerial was characterized by superior micro-hardness, of above 500 HV0.1.