The effects of processing parameters on the flow behavior and microstructures were investigated in hotcompression of powder metallurgy (P/M) Ti-6Al-4V alloy. The alloy was fabricated by a blended elemental (B/E)approach and it exhibited lamellar α+β microstructure. The hot compression tests were performed in the range of tem-perature 800-1000℃ with 50℃ intervals, strain rate 10−4-10 s−1, and strain up to 0.5. At 800-950℃, continuous flowsoftening after a peak stress was observed with strain rates lower than 0.1 s−1. At strain rates higher than 1 s−1, rapiddrop in flow stress with strain hardening or broad oscillations was recorded. The processing map of P/M Ti-6Al-4V wasdesigned based on the compression test and revealed the peak efficiency at 850℃ and 0.001 s−1. As the processing tem-perature increased, the volume fraction of β phase was increased. In addition, below 950℃, the globularization of phaseat the slower strain rate and kinking microstructures were found. Based on these data, the preferred working conditionof the alloy may be in the range of 850-950℃ and strain rate of 0.001-0.01 s−1.

A magnetic powder, M-type barium hexaferrite (BaFe12O19), was consolidated with the spark plasma sin-tering process. Three different holding temperatures, 850℃, 875℃ and 900℃ were applied to the spark plasma sinteringprocess with the same holding times, heating rates and compaction pressure of 30 MPa. The relative density was mea-sured simultaneously with spark plasma sintering and the convergent relative density after cooling was found to be pro-portional to the holding temperature. The full relative density was obtained at 900℃ and the total sintering time wasonly 33.3 min, which was much less than the conventional furnace sintering method. The higher holding temperaturealso led to the higher saturation magnetic moment (σs) and the higher coercivity (Hc) in the vibrating sample magne-tometer measurement. The saturation magnetic moment (σs) and the coercivity (Hc) obtained at 900℃ were 56.3 emu/g and541.5 Oe for each.