No abstract

No abstract

No abstract

No abstract

No abstract

Ferro-manganese and ferro-chromium particles (FeMnp and FeCrp) were added to a copper matrix and examined for applications requiring wear resistance and rupture strength. Cu/FeMnp, Cu/FeCrp and Cu/FeMnp/FeCrp metal matrix composites (MMCs) were prepared using a powder metallurgy technique to get a homogeneous distribution of particles in controlled amounts. Powders were mixed, compacted, and sintered in a protective argon gas environment. In a wear test, the MMCs showed a favorable resistance to weight loss when pressed against a moving AISI 304 stainless steel wear plate. Rupture strength was determined using a standard transverse rupture test. Fractographs taken of wear and ruptured surfaces together with rupture strength measurements were correlated with the amount and type of particle reinforcement and MMC hardness. The formation of Metal Carbide (MC) and Metal Oxide (MO) around reinforcing particles was also considered. Transverse rupture strength was found to decrease after exceeding a specific amount of reinforcement.

No abstract

The effect of TiC content on the wear resistance of a Zn ± Al alloy was investigated under 300 ± 900 N loads. Sliding tests were carried out to study the wear behaviour of TiC p reinforced ZnAl27 metal matrix composites (MMCs) against AISI type 1050 steel in a block on ring apparatus. The ZnAl27/TiC p MMCs, which were prepared by the addition of 5, 10, and 15 vol.-% TiC p , were produced by powder metallurgy, and the size of particulates was varied at 80, 20, and 5 m m. The powders were uniaxially cold compacted by increasing the pressure up to 250 MPa. Wear tests were carried out in an incremental manner, i.e. 300 m per increment and 1800 m in total. The results of these tests were used to investigate the relationship between weight loss, microstructure, surface hardness, friction coef® cient, particle size, and particulate percentage. It was observed that TiC p particulate reinforcement is bene® cial in increasing the wear resistance of ZnAl27 alloy, and TiC particulates in MMCs tend to reduce the extent of plastic deformation in the subsurface region of the matrix, thereby delaying the nucleation and propagation of subsurface microcracks.MST/4983