Pseudo-Superplastic Characteristics of ZK60 Alloy with Fibrous Microstructure

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  • Wang Cheng-Yu
    Department of Materials Science and Engineering, National Chao Tung University
  • Wang Jian-Yih
    Department of Materials Science and Engineering, National Dong Hwa University
  • Saufan Akhmd
    Department of Materials Science and Engineering, National Dong Hwa University
  • Fu Yen-Pei
    Department of Materials Science and Engineering, National Dong Hwa University

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<p>The superplasticity of ZK60 alloy was investigated after thermomechanical treatments (combination of rolling at 473 K and 673 K). ZK60 alloy, with an equiaxial grains microstructure (average grain size 2.6 µm), showed a maximum elongation of 865.2% with the strain rate 1 × 10−4 s−1 under high temperature tensile test at 573 K. Surprisingly, hot-rolled ZK60 samples with fibrous microstructure also displayed pseudo-superplastic behavior with an elongation of 535.2% at the same temperature. Microstructures indicated that the hot-rolled samples with elongated grains exhibited dynamic recovery and recrystallization during high temperature deformation, transforming the fibrous to fine-grained crystals, and thus retaining pseudo-superplastic behavior.</p>

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