High-Temperature Tribological Behavior of the Ti-22Al-25Nb (at. %) Orthorhombic Alloy with Lamellar O Microstructures

Abstract

Tribological behavior of the isothermally forged and heat-treated Ti-22Al-25Nb (at. %) orthorhombic alloy with lamellar O microstructures was investigated. The friction experiments using a tribometer (UMT-3 CETR) against Si 3 N 4 and Al 2 O 3 were conducted at the load of 10N from 20 to 750 • C and a constant speed of 0.188 m/s. The experiment results indicated that for the friction pair of Al 2 O 3 , the coefficient of friction (COF) was decreased from 0.906-0.359, and for the friction pair of Si 3 N 4 , COF was decreased from 0.784-0.457 as the friction temperature increased from room temperature to 750 • C. The wear rate of the alloy against Al 2 O 3 is in the range of 2.63-8.15 × 10 −4 mm 3 N −1 m −1 , the wear rate against Si 3 N 4 is in the range of 2.44-5.83 × 10 −4 mm 3 N −1 m −1 , respectively. The wear mechanisms of the alloy were changed from plastic deformation and ploughing at lower temperature (20-400 • C) to adhesive wear and oxidative mechanism at higher temperature (600 and 750 • C). The friction and wear behavior of the Al 2 O 3 friction pair was comparable to that of the Si 3 N 4 friction pair.

Microhardness, compression performance and high‐temperature tribological properties of Ti2AlNb‐silver self‐lubricating composite

“…It is believed that the residual oxide debris on the alloy surface act as cutting tools accelerate the wear in room‐temperature friction. On the contrary, the protective oxide layer formed at high temperature improves the wear resistance of the alloy, but there may be a transition temperature that varies with the materials [32, 41–43]. Comparing the friction coefficients at room temperature and 500 °C, it is found that oxides have a positive effect on the friction reduction of Ti 2 AlNb‐silver composites, especially for low‐silver samples [31].…”

“…Therefore, this work focuses on the high‐temperature tribological performance of the Ti 2 AlNb‐silver self‐lubricating composite. The tests temperature was selected as 500 °C to avoid excessive softening and loss of silver [32]. Besides, the deteriorations of the mechanical properties of the composite material were foreseen due to the presence of soft silver, so the microhardness (room temperature) and compression performance (room temperature and 500 °C) were characterized to quantify the negative effects of silver and evaluate the load‐bearing capacity of the material [33].…”

Tribological Properties of Ti2AlNb Matrix Composites Containing Few-Layer Graphene Fabricated by Spark Plasma Sintering

“…In recent years, the Ti 2 AlNb-based alloy has become one of the preferred materials for aero-engine because of its light weight and high-temperature strength including high fracture toughness, better creep and fatigue resistance, and oxidation resistance [1][2][3]. As the application of the high-temperature moving parts in the aero-engine, the Ti 2 AlNb-based alloy would be easily worn out.…”

Study on Friction Behavior of Ferroalloy and Wet Granulation Sulfur under Low Normal Load Conditions

“…Wang investigated the high-temperature tribological behavior of the Ti-22Al-25Nb (at. %) orthorhombic alloy with lamellar O microstructures [16]. Some scholars have studied the contact problems involved in the friction process of rough surface and put forward different contact models [17][18][19][20].…”