Variation of Precipitation Behavior With Heat Treatment of Friction Stir Processed AA6082
The extruded AA6082 was heat treated after friction stir processing (FSP) in this study. The grain size is affected by the friction heat during FSP. Smaller grain size is confirmed in the stir zone (SZ) than any other regions due to the dynamic recrystallization. Hardness is substantially
enhanced during heat treatment after FSP. Hardness is highly fluctuated in the region of heat affected zone (HAZ) during aging process. The region of HAZ is divided into three regions called as HAZ1, HAZ2 and HAZ3 where the area of HAZ1, HAZ2 and HAZ3 is defined as the area close to SZ, middle
of HAZ and close to base material (BM), respectively. The crystal structure of nano size precipitates is revealed using high resolution transmission electron microscope. The maximum hardness is obtained in base material region due to the formation of the β″ phase with high
number density. On the other hand, the minimum hardness is identified in HAZ2 since the grain is grown and the β″ phase is formed during FSP.
Keywords: Hazardous Gas Sensor; Impregnated Palladium; Mesoporous Tin Oxide
Document Type: Research Article
Affiliations: 1: Carbon and Light Material Application Group, Korea Institute of Industrial Technology, 100, Jipyungsun Sandan 3gil, Backsan-Myeon, Gimje-si, 54325, South Korea 2: Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1, O-Okayama, Meguro-ku, Tokyo, 152-8552, Japan
Publication date: 01 June 2017
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