Mg-based metallic glass matrix composite with in situ porous titanium dispersoids by dealloying in metallic melt

Development and microstructure optimization of Mg-based metallic glass matrix composites with in situ B2-NiTi dispersoids

“…positions of NiTi, which had been split to the other fracture surface, which effectively prohibited the rapid propagation of the crack and increased the fracture strength during bending. Moreover, our previous research has shown that when the particle size is decreased and close to R p , the local areas around these fine particles satisfy the optimum condition, d % k % R p , and these regions are able to deform plastically, which may be another reason for the improved fracture strength of the specimens with finer particles [26]. However, the mean inter-particle spacing for A-RC3, which had the finest particles, was $3 lm, twice as large as R p ($1.5 lm), because of the low volume fraction of NiTi.…”

“…However, unlike ex situ BMGMCs, for which the size of the second phase can be easily controlled by adding various sized particles, it is difficult to control the size of the precipitated second phase for in situ BMGMCs. Our previous research reported one possible method [26]. Increasing the cooling rate of Ti-Cu-Gd alloy was found to decrease the size of the precipitated Ti 2 Cu phase, i.e., a higher cooling rate generates a finer microstructure.…”

Preparation of Nano to Submicro‐Porous TiMo Foams by Spark Plasma Sintering

“…The SPS processing parameters for the fabrication of the (Ti15Mo) 1–x Cu x master alloys are determined at temperature of 830 °C for holding time of 10 min under pressure of 50 MPa. The SPS temperature for the dense (TiMo)–Cu master is much lower than that of the arc‐melting method (1 700 °C) and normal powder metallurgy methods for fabricating of Ti and Ti alloys, which are always higher than 1 200 °C…”

“…The optimal dealloying parameter is at SPS temperature of 600° for holding time of 30 min to obtain pure β phased Ti15Mo foams. The dealloying temperature is much lower than the method of Mg melts (700–900 °C) . There are less than 1.0 at% Cu atoms, left in the foams after the solid state dealloying and acid etching.…”

“…To overcome this, Wada et al reported the preparation of NP α‐Ti by dealloying of TiCu master alloy within Mg melt and nano to submicro‐porous β‐TiZrCr foams by dealloying of (TiZrCr)‐Cu master alloy within Mg melt . The Mg melt dealloying method was accomplished by attractive interactions between Cu and Mg and repulsive interactions between Ti and Mg . They have reported the preparation of NP Nd, Fe, Cr, ferritic stainless‐steel using this Mg melt method …”