215 マルチパスFSPによる7075Al合金の組織制御と機械的特性(OS9-(2) 超塑性と材料および造形法,オーガナイズドセッション)

概要

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Friction stir welding (FSW) is a kind of solid state bonding method developed by The Wekling Institute (TWI), and is a novel welding method for light metals and alloys. It is now well known that FSW'ed zone has an equixial and fine-grained microstructure. Therefore, many researchers have been paid attention to this as a microstructure contol method for variety of alloys including Al and Mg alloys; it is now called Friction Stir Processing (FSP). Up to date, however, there have been only a few reports on the FSP that have been applied to refine the grain size of large areas in the alloys. In the present study, we have carried out multi-pass FSP experiments on a high strength 7075Al alloy. We have found that Pass Boundary Zone (PBZ) appeares in the region between successive passes. In the PBZ the existence of many sub-grains was found. The influence of the PBZ are discussed in some detail.
2009-08-25