Development of Ultrafine-grained Microstructure and Low Temperature (0.48 Tm) Superplasticity in Friction Stir Processed Al-Mg-Zr
Friction stir processing (FSP) was applied to extruded Al-4Mg-1Zr to produce fine-grained microstructure with grains sized 0.7-1.6 μm. Low temperature deformation behavior was investigated at 175 °C and initial strain rates of 5 × 10−5-3 × 10−3 s−1. Low temperature superplasticity was observed in ultrafine-grained material. A maximum superplastic elongation of 240% was obtained in ultrafine-grained (0.7 μm) FSP sample at an initial strain rate of 1 × 10−4 s−1 where a maximum strain rate sensitivity of 0.34 was observed.
Z. Y. Ma and R. S. Mishra, "Development of Ultrafine-grained Microstructure and Low Temperature (0.48 Tm) Superplasticity in Friction Stir Processed Al-Mg-Zr," Scripta Materialia, Elsevier, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1016/j.scriptamat.2005.03.018
Materials Science and Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Friction Stir Processing; Low Temperature Superplasticity; Ultrafine Grains; Aluminum alloys
Article - Journal
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