An investigation on oxidation wear mechanisms of Ti–46Al–7Nb–0.7Cr–0.1Si–0.2Ni intermetallic-based alloys

THE ANALYSIS OF THE EFFECT OF TIME AND TEMPERATURE OF AIR ON THE COLOURING OF THE SURFACE LAYER OF O-Ti2AlNb BASED TITANIUM ALLOY

“…TiO 2 -rutile is always the first oxide, which forms on the surface at the initial stages of oxidation as the titanium's activity is much higher than the aluminum's activity. The content of Al 2 O 3 in the scale is much lower [19]. However, the thickness of the forming oxide layer strongly depends on the time and temperature of holding in the air atmosphere.…”

Preparation of SiO2 coating by sol-gel method, to improve high-temperature corrosion resistance of a γ-TiAl phase based alloy

“…It was determined that during oxidation a multi-phase scale is formed characterized by identical sequence of sublayers: the outer sublayer is made of rutile, the middle sublayer is rich Al 2 O 3 and contains a lesser amount of TiO 2 and the sublayer containing Al 2 O 3 , TiO 2 and oxides of Nb, Cr, Ni [20]. The surface of the sample with the deposited coating is shown in Fig.…”

“…The material in the shape of a roll with the diameter of about 69 mm was purchased from Flowserve Corporation Titanium and Reactive Metals Foundry (USA). The structure of the tested alloy was determined as duplex [20]. The tests of isothermal oxidation in air were performed at the temperature of 900°C.…”

Effects of Powder Preparation and Sintering Temperature on Properties of Spark Plasma Sintered Ti-48Al-2Cr-8Nb Alloy

“…However, due to heat radiation during the sintering process, the mold loses heat during the heat transfer process which causes the material to have a temperature gradient from the center to the surface [15]. The addition of Nb to TiAl alloy can further improve its high temperature yield strength, high temperature oxidation resistance, and high temperature creep resistance [16][17][18]. However, due to the high melting point of Nb (2468 • C) [19], high contents of Nb can lead to an increased melting point, and detrimental inhomogeneity and segregation may also appear in the microstructures of the TiAl alloy making 2 of 12 material preparation difficult [20].…”