EFFECT OF IN-SITU TITANIUM BORIDE PARTICLE ADDITION AND FRICTION STIR PROCESSING ON WEAR BEHAVIOR OF ALUMINUM ALLOY 2219

摘要

There is paucity of data on the effect of in-situ TiB_2 particles on the different behavior of 2219 Al alloy. In the present work, therefore, composites with 2219 Al alloy matrix reinforced with in-situ TiB_2 particles were produced by flux-assisted synthesis. Different amounts (5 and 10 wt.%) of TiB_2 were incorporated. The base alloy and the composites were subjected to friction stir processing to reduce particle clustering. The wear behavior of the materials was studied. The base alloy showed considerable improvement in the wear behavior due to the in-situ particle addition which is attributed to the presence of finer particles with good interfacial bonding and high hardness. Uniform distribution of TiB_2 particles and good interface between the matrix and the particles led to reduction in the wear of friction stir processed composites by 30%. The results are analyzed and discussed in detail in the paper.