Surface Composite fabrication using FSP

What is it about?

Surface metal matrix composites were synthesized via friction stir processing (FSP) on the surface of aluminium alloy 7075 (AA 7075) sheets by incorporating B4C particles (B4CP). The influence of tool rotational speeds, powder particle sizes, and change in tool travel direction between FSP passes on particle distribution and resulting properties were studied in detail.

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Why is it important?

AA 7075 is one of the strongest aluminium grades and possesses higher flow stress at room temperature compared to other grades (McDanels, 1985). These properties make it extremely difficult to plastically rupture the substrate and consolidate reinforcing particles during FSP. Hence, in the course of SMMC fabrication, the majority of the studies are reported utilizing softer aluminium alloy substrates viz., AA 1xxx, 3xxx, 5xxx, 6xxx, etc. Hardly any researcher has reported formulation of SMMC employing AA 7075 substrate through FSP. Besides, B4CP comprises of extraordinary properties like good neutron absorptivity, high-temperature stability (up to 1900 °C), very high hardness (third after diamond and boron nitride) and low density, making it a worthwhile choice for reinforcement in light alloys. The boosted high-temperature strength and neutron absorptivity of Al-B4CP composites substantiate investigating their suitability for use in current and emerging nuclear and aerospace applications.

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