Effect of CrSi/CrSi2 content on the microstructure and properties of vacuum hot-pressed Cr-50 wt% Si alloys

Investigation of the vacuum hot pressing process on the mechanical properties, microstructures and material characteristics of Ni–35Mo–15Cr alloys

“…As the hot pressing temperature increases, the Cr is gradually dissolved into the MoNi 4 compounds (Figure 2(a)) which is helpful for improving sintered density. Our previous studies also showed that decreasing the porosities of the hot pressing materials will effectively enhance the plastic deformation resistance and hardness [11,12,15,16]. However, the porosity and grain coarsening phenomenon are the main factors resulting in the declining hardness and TRS values.…”

“…hot pressing sintering (HPS), owing to its low working temperatures and high-pressure application [13,14]. Generally speaking, vacuum hot pressing is a special PM technology, it is a complex method that combines conventional sintering and pressing processes, making it possible to obtain a densified material at a relatively low sintering temperature [15,16].…”

Microstructure, material characteristics and mechanical properties of CoMoNiTa3 medium-entropy alloys through the vacuum hot pressing process

“…As seen in Figure 9(b), although the uniaxial pressure was applied by the HP process in this study, the CoMoNiTa 3 alloy does not have an obvious grain orientation preference. 12,30,31 In addition, in the phase structure analysis of Figure 9(c), the red area is the FCC matrix phase, the blue area is the μ phase of the second phase and the white area is the Ni 3 Ta phase. Notably, the second phase presents a uniform distribution of discontinuous precipitation, and the smallest Ni 3 Ta phase is partial precipitation.…”

“…Consequently, it was reasonably concluded that no significant crystallographic orientation was produced during the HP process of CoMoNiTa 3 alloys, which is consistent with the characteristics of the PM technique. 10,30,31…”

“…Consequently, it was reasonably concluded that no significant crystallographic orientation was produced during the HP process of CoMoNiTa 3 alloys, which is consistent with the characteristics of the PM technique. 10,30,31 This experiment used the optimal HP parameters of CoMoNiTa 3 medium-entropy alloys (1100 °C HP at 50 MPa for 1 h) to further analyse and observe the characteristics of intermetallic compounds. Figure 11 shows the TEM images observation results of the optimal HP sintered CoMoNiTa 3 alloys; among them, Figure 11 According to the above analysis and discussions, the result of this study reveals an obvious lattice change after the HP of holding temperature and pressure for 1 h and shows that the solid solution phenomenon occurred in the HP process.…”