Peak stir zone temperatures during Friction Stir Processing
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Author
Swaminathan, Srinivasan
Oh_Ishi, Keiichiro
Zhilyaev, Alexander P.
Fuller, Christian B.
London, Blair
Mahoney, Murray W.
McNelley, Terry R.
Date
2010Metadata
Show full item recordAbstract
The stir zone (SZ) temperature cycle was measured during the friction stir processing (FSP) of NiAl
bronze plates. The FSP was conducted using a tool design with a smooth concave shoulder and a
12.7-mm step-spiral pin. Temperature sensing was accomplished using sheathed ther- mocouples
embedded in the tool path within the plates, while simultaneous optical pyrometry measurements of
surface temperatures were also obtained. Peak SZ temperatures were 990 !C to 1015 !C (0.90 to 0.97
TMelt) and were not affected by preheating to 400 !C, although the dwell time above 900 !C was
increased by the preheating. Thermocouple data suggested little varia- tion in peak temperature
across the SZ, although thermocouples initially located on the advancing sides and at the
centerlines of the tool traverses were displaced to the retreating sides, precluding direct
assessment of the temperature variation across the SZ. Microstructure-based estimates of local peak
SZ temperatures have been made on these and on other similarly processed materials. Altogether, the
peak-temperature determinations from these different measurement techniques are in close agreement.
Description
The article of record as published may be found at http://dx.doi.org/10.1007/s11661-009-0140-7
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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