The combined effect of the cooling rate and microalloying has been studied from suction casted Cu50Zr50, Cu49.5Zr50Fe0.5 Cu49Zr50Fe1 at. % rods 2 mm 4 diameter. For samples, ∼1000 K/s rate, microstructure mostly consists B2 CuZr austenite it is basically same for all compositions. However, 0.5 Fe addition promotes formation stress-induced B19’ martensite upon wear testing thus improving resista...

Solid lubricants are commonly found in applications where more traditional lubrication techniques are undesirable or precluded. Polytetrafluoroethylene (PTFE) is an attractive solid lubricant, but high wear rates limit its use. While nanofillers have been found, in some cases, to provide wear resistance without introducing other detrimental effects, the mechanisms of wear resistance remain uncl...

During the last two decades, improvements in hip and knee designs, bearing materials, sterilisation techniques, oxidation stabilisation, and articulating surface treatments have led to superior performance of total hip and knee arthroplasties by reducing the prevalence of wear, delamination, and structural material fatigue. These advances are expected to show substantial benefits in decreasing ...

Abstract A novel two-dimensional ultrasonic surface burnishing process (2D-USBP) is proposed. 7075-T6 aluminum samples are processed by a custom-designed 2D-USBP setup. Parameter optimization of conducted to determine the best processing strategy aluminum. uniform design method utilized optimize process. U 13 (13 3 ) and 7 (7 2 tables established conduct parameter optimization. Burnishing depth...

Delamination is one of the most concern defects in drilling of composite material. Delamination depends on the factors such as feed rate, tool geometry and wear. The mechanics of drilling composite materials has been examined along with the quality of the hole and the effect of tool design parameters. The capacity of computerized tomography (CT) showing sample cross-section in a nondestructive ...

Carbon fiber-reinforced polymer (CFRP) is widely used in various fields due to its excellent properties. However, machining defects such as delamination and burr are still the key issues constraining high-quality hole making on CFRP. This research takes helical milling process make holes CFRP two kinds of cutting conditions (dry jet cold air-assisted cutting) explored. Tool wear, force, delamin...

In this work, the thermal stability and the oxidation and tribological behavior of nanoporous a-BC:H films are studied and compared with those in conventional diamond-like carbon (DLC) films. a-BC:H films were deposited by pulsed plasma chemical vapor deposition using B(CH3)3 gas as the boron source. A DLC interlayer was used to prevent the a-BC:H film delamination produced by oxidation. Therma...

During the last decade, new bearing materials, new methods in in vitro wear simulation, specific cell culture, and animal models to evaluate the response to particulate debris, and dedicated retrieval analysis programs to learn more about material degradation in vivo have been developed in the field of biotribology. Improvements in knee arthroplasty design, materials, sterilisation techniques, ...

Porous carbon fiber-reinforced Al-Si alloy matrix composites and fiber felt-reinforced with content of 10 wt.% were prepared by die casting. The dry tribological properties these two studied using a ball-on-disc rotational tribometer in the speed range 300 r/min to 1000 r/min, wear mechanisms analyzed combination morphology. results show that friction coefficient rate are lower than at differen...

The effect of normal force on fretting wear behavior zirconium alloy tube mated with grid dimple in simulated primary water pressurized reactor nuclear power plant was investigated. Results showed that the maximum depth, volume and coefficient Zr at 315 °C gradually increased increasing force, while friction decreased. Fretting process could be divided into four stages according to variation du...