Abstract
Air-atomized pure aluminium powder was mechanically milled (MM) using a vibrational ball mill, and mechanically milled powder was sintered by spark plasma sintering (SPS). Solid-state reactions of MM powder after various heat treatments were studied by X-ray diffraction (XRD). The mechanical properties of the SPS materials were evaluated by hardness testing. Characterisations of the solid-state reactions between the MM powder and process control agent after heating at temperatures from 573K to 873K for 24h suggested the following products: No solid-state reaction was observed after heating up to 573K for 24h. Formation of γ-Al_2O_3 occurred in the 4h MM powder after heating at 773K for 24h, whereas the mixture of γ-Al_2O_3 and Al_4C_3 was observed in the 8h MM powder after heating at 773K for 24h. The full density of the SPS material was obtained with the condition of applied pressure at 49MPa at 873K for 1h The Vickers hardness of the SPS materials produced from no MM process and 64h MM powders exhibited HV39 and HV159, respectively.
Sign-in/Register to access full text options 
Free) 
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 call
