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    National Tsing Hua University Institutional Repository > 工學院  > 材料科學工程學系 > 期刊論文 >  Microstructural evolution and superplasticity of Al-5.8Mg-0.23Mn alloys processed by reciprocating extrusion


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/62289


    Title: Microstructural evolution and superplasticity of Al-5.8Mg-0.23Mn alloys processed by reciprocating extrusion
    Authors: Lee SW;Yeh JW
    教師: 葉均蔚
    Date: 2005
    Publisher: Springer Verlag
    Relation: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,Volume: 36A,Issue: 8,Pages: 2225-2234,Published: AUG 2005
    Keywords: STRAIN-RATE SUPERPLASTICITY
    AL-MG ALLOYS
    PLASTIC-DEFORMATION
    Abstract: This study developed the reciprocating extrusion method to refine the inclusions and grain structure of Al-5.8Mg-0.23Mn alloys to enhance their strength and superplasticity without prior homogenization treatment. Alloy cast billets were extruded with an extrusion ratio of 10: 1 at 450 degrees C for one, five, or ten passes. The grain size was reduced to 4.6 mu m, and the coarse inclusions refined to 2 mu m, after ten passes. A subgrain structure was formed in the interior of the fine grains, indicating that dynamic recrystallization occurred during extrusion. In this study, dynamic recrystallization in the billet was repeatedly induced by a number of extrusion passes until a limiting grain size was obtained. Thereafter, dynamic recrystallization was no longer activated because grain boundary sliding, instead of dislocation gliding, accommodated the deformation strain required for extrusion. The alloys extruded in ten-passes extrusion were found to be stronger and more ductile than commercial Al-Mg alloys and showed improved superplastic behavior at 500 degrees C not only from low to high strain rate but also with a small flow stress of less than 30 MPa. These advantages demonstrate that reciprocating extrusion can produce Al-Mg alloys with improved mechanical properties making them good candidates for high-strain-rate superplastic forming.
    URI: http://www.springerlink.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/62289
    Appears in Collections:[材料科學工程學系] 期刊論文

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