Abstract
Effects of mechanical alloying (MA) parameters on characteristics of nanocrystalline Fe–Cr–W–Ti–Y 2O 3 powders, including alloying degree, grain size, microhardness and morphology had been systematically investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the alloying degree of milled powders was increased with the elevation of milling rotational speed and elongation of milling duration. The W atoms were completely dissolved into the iron matrix after milling at 350 rpm for 24 h. The grain size of milled powders was decreased sharply at first stage of milling and leveled off after 24 h, while lattice strain was increased. The microhardness of alloyed powders was elevated firstly and stabilized at about 607.4 HV after 24 h milling. Process control agent (PCA) effected the morphologies and retarded the alloying extent of the milled powders. Finer, more uniform and spherical particles were obtained when steric acid (SA) was chosen as PCA. Increasing ball to powder ratio (BPR) would lead to efficient reduction of average particle size, but decrease powder yield and increase contamination.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
