Characterization and tribological behavior of cast In-Situ Al (Mg,Mo)-Al2O3 (MoO3) composite |
| |
| Authors: | Abdulhaqq A Hamid S C Jain P K Ghosh Subrata Ray |
| |
| Affiliation: | (1) Mechanical Engineering Department, College of Engineering, University of Mosul, Mosul, Iraq;(2) Mechanical and Industrial Engineering Department, the Indian Institute of Technology Roorkee, 247 667 Roorkee, Uttranchal, India;(3) Metallurgical and Materials Engineering Department, the Indian Institute of Technology Roorkee, 247 667 Roorkee, Uttranchal, India |
| |
| Abstract: | Aluminum alloy—based cast in-situ composite has been synthesized by dispersion of externally added molybdenum trioxide particles (MoO3) in molten aluminum at the processing temperature of 850 °C. During processing, the displacement reaction between molten
aluminum and MoO3 particles results in formation of alumina particles in situ and also releases molybdenum into molten aluminum. A part of this molybdenum forms solid solution with aluminum and the remaining
part reacts with aluminum to form intermetallic phase Mo(Al1−x
Fe
x
)12 of different morphologies. Magnesium (Mg) is added to the melt in order to help wetting of alumina particles generated in situ, by oxidation of molten aluminum by molybdenum trioxide, and helps to retain these particles inside the melt. The mechanical
properties of the cast in-situ composite, as indicated by ultimate tensile stress, yield stress, percentage elongation, and hardness, are relatively higher
than those observed either in cast commercial aluminum or in cast Al-Mo alloy. The wear and friction of the resulting cast
in-situ Al(Mg,Mo)-Al2O3(MoO3) composites have been investigated using a pin-on-disc wear testing machine under dry sliding conditions at different normal
loads of 9.8N, 14.7N, 19.6N, 24.5N, 29.4N, 34.3N, and 39.2 N and a constant sliding speed of 1.05 m/s. The results of the
current investigation indicate that the cumulative volume loss and wear rate of cast in-situ composites are significantly lower than those observed either in cast commercial aluminum or in cast Al-Mo alloy, under similar
load and sliding conditions. Beyond about 30 to 35 N loads, there appears to be a higher rate of increase in the wear rate
in the cast in-situ composite as well as in cast commercial aluminum and cast Al-Mo alloy. For a given normal load, the coefficient of friction
of cast in-situ composite is significantly lower than those observed either in cast commercial aluminum or in cast Al-Mo alloy. The coefficient
of friction of cast in-situ composite increases gradually with increasing normal load while those observed in cast commercial aluminum or in cast Al-Mo
alloy remain more or less the same. Beyond a critical normal load of about 30 to 35 N, the coefficient of friction decreases
with increasing normal load in all the three materials. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
