In situ processing of Al2O3 whiskers reinforced Ti-Al intermetallic composites

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Al₂O₃/TiAl <i>In-Situ</i> Composites

“…2. It shows that the samples contain two phases: a dark lamellar TiAl matrix and a dispersion of bright alumina particles, which is consistent with the previous work [11]. When the sample was sintered at 1100 °C (Fig.…”

“…The Al 2 O 3 has been proven to be a suitable reinforcement since it has high modulus, high specific strength, low density, and good oxidation resistance. Moreover its coefficient of expansion closely matches to TiAl matrix [11,12]. Additionally, the refractory elements such as Nb, Mo, Cr, have also been added to TiAl alloy to enhance the ductility at room temperature and elevated temperature strength [13,14].…”

Mechanical properties and microstructure of Al2O3/TiAl in situ composites doped with Cr2O3

“…Therefore, intermetallic matrix composites (IMCs) have been developed to provide the right combination of high-temperature strength and creep resistance, and to resolve the problem of poor ductility and toughness at ambient temperatures [8][9][10]. Al 2 O 3 was chosen as a ceramic reinforcement because of its advantageous thermo-mechanical behavior including wear resistance, environmental stability, and high temperature strength, and because its thermal expansion coefficients match closely to those of ␥-TiAl [11,12]. The existence of second-phase Al 2 O 3 particles can also hinder the movement of the grain boundaries, restrain the growth of grains, and enhance the heat-resistance stability [13].…”

Mechanical properties and microstructure of Al2O3/TiAl in situ composites doped with Cr

“…Therefore, the TiAl intermetallic matrix composites (IMCs) have been developed to provide the right combination of high-temperature strength and creep resistance, and to resolve the problem of poor ductility and toughness at ambient temperatures [8][9][10]. Al 2 O 3 is often chosen as a ceramic reinforcement because of its advantageous thermo-mechanical behavior including wear resistance, environmental stability, high temperature strength, and close match on thermal expansion coefficients with γ-TiAl [11][12][13]. Previously, the refractory elements such as Nb, Mo, Cr, Mg, have also been added to TiAl alloy to modify its mechanical properties and illustrated the strengthening effect [14][15][16].…”