No abstract

The size of equipments now a day reduced to microns and nanos. So, the wear characteristics play a dominating role in the proper working of equipments utilized in engineering and medical fields. NiTi alloys have different applications in medical and engineering field due to their unique characteristics of super-elasticity, corrosion resistance, shape memory and bio-compatibility. In the present research, Ni50Ti50 alloy have been fabricated by powder metallurgy method with polypropylene as a binder. During sintering process at 1150°C, organic binder evaporates and makes the alloy porous. The surface of NiTi alloy is covered by TiO2 layer, which increases its wear resistance, but with the increase of frictional heat (produced due to pin on disc apparatus experimentation) this layer, breaks and wear rate increases. The mean value of wear loss was investigated at 95% of confidence level and further experiments were performed to validate the predicted value.

No abstract

In the present paper aluminum matrix composites were fabricated using base material AA6082-T6. SiC and B4C particulates were used as reinforcement to obtain hybrid and non-hybrid composites through the conventional stir casting process. AA6082-T6/SiC composites with 5, 10, 15 and 20 wt % of SiC; AA6082-T6/B4C composites with 5, 10, 15 and 20 wt % of B4C and AA6082-T6/(SiC+B4C) hybrid composites with 5, 10, 15 and 20 wt % of (SiC+B4C) taking equal fraction of SiC and B4C were made and the microstructure study was carried out. X-Ray diffraction (XRD) patterns revels the presence of reinforcement within the matrix along with some other compounds. The microstructure of the fabricated composites was examined with the help of Scanning electron microscope (SEM) and the micrographs revealed that the dispersion of reinforced particles was reasonably uniform at all weight percentages.

No abstract