The Effect of Additives on Structure-Properties Relations of Aluminum Bronze Alloys

Abstract

The following research investigates the application of a relatively novel technique for transforming the microstructure and surface properties of a copper alloy. The technique is based on friction and stirring mechanisms that cause heat generation and material mixing. The effect of process parameters, such as; rotation speed, traverse speed, forced convection were investigated in this research. The following treatments were used 800/40, 800/64, 800/93, 1000/93, 1200/93 with and without the application of air cooling of 4.5m3/min. The minimum grain size of 1.9μm at 800/93/AIR. The highest β’ phase % was achieved at 800/40/AIR. The highest average hardness value was achieved at 1200/93/AIR. The air cooling prevented post-recrystallization grain growth, increased the β’ phase %, and enhanced the hardness values. The NiAl Bronze alloy matrix reinforced with SiC particles was successfully achieved. NAB/(9.7%SiC+0.24%WC) surface composite layer was achieved through the groove filling method. The effect of incorporation of SiC particles on microstructure and hardness of the NAB alloy was investigated in this research. Other dispersion methods were also studied. SiC particles were dispersed to the sample surface using groove, hole, and surface coating methods. The minimum grain size and maximum hardness values were 2.6μm and 288 HV5. These results were achieved by FSP-Groove.