Friction stir processing

About: Friction stir processing is a research topic. Over the lifetime, 2977 publications have been published within this topic receiving 62158 citations.

Surface modifications of an aluminum-magnesium alloy through reactive stir friction processing with titanium oxide nanoparticles for enhanced sliding wear resistance

Abstract: Reactive friction stir processing (RFSP) has been employed to modify the surface properties of AA5052 Al-Mg alloy through grain refinement and the distribution of ultrafine hard nanoparticles (2 to 6% volume fractions of 50 nm titanium dioxide). The heat generated induced solid state reactions between the metal matrix and the reinforcement to form Al3Ti/MgO inclusions. The role of grain refinement and distributed hard nanoparticles on the tribological behavior of the alloy under dry sliding wear condition was evaluated. The wear rates and friction coefficient as well as macro- and micro-features of the worn surfaces indicate that the wear mechanism (at 3–7 kgf and 0.5 m/s) is abrasive. The wear rate decreased with increasing volume fraction of the hard inclusions with a significant reduction in the friction coefficient. The wear resistance could be improved > 125% (compared with the annealed alloy) at 6 vol% TiO2. The relations between the enhanced wear resistances, the microstructural changes and mechanical properties have been characterized.

Multipass FSP on AA6063-T6 Al: Strategy to fabricate surface composites

Abstract: Surface composites were fabricated on AA6063-T6 base metal using silicon carbide (SiC) reinforcement particles by friction stir processing (FSP). Influence of multiple FSP passes was investigated on the SiC particle distribution, processed zone dimensions, and microhardness of fabricated composites. The rotational speed, traverse speed, and tool tilt were kept constant and the numbers of passes were varied at 2, 4, 6, and 8. The particle distribution in processed zone was analyzed using OM and SEM, while microhardness were evaluated by Vickers indentation test. The results reveal that with increase in FSP passes there is increase in processed zone dimensions and elimination of defects such as agglomeration of particles and void. The microhardness of reinforced region was increased uniformly with increasing passes which is attributed to homogeneous distribution of reinforcement particles. The peak microhardness value of 81.9 Hv was obtained in sample which is processed with eight numbers of FSP pas...

Improvement of microstructural, mechanical and tribological characteristics of A413 cast Al alloys using friction stir processing

Abstract: In the present investigation, the effect of the friction stir processing (FSP) on the microstructural, mechanical and tribological characteristics of as-cast A413 aluminum alloy was studied. The influence of the tool rotational and traverse speeds on such characteristics was evaluated. The results revealed that FSP has significantly improved the microstructure of the A413 Al alloy by eliminating structural defects such as porosity and Si segregation. The size of the Si particulates as well as the α-Al grains increases with increasing tool rotational speed and/or decreasing the tool traverse speed. The FSPed zones exhibited better mechanical properties as well as dry sliding wear resistance than the as-cast base alloy.