Pseudo-Superplastic Characteristics of ZK60 Alloy with Fibrous Microstructure
2018 年 59 巻 4 号 p. 674-678
詳細
2018 年 59 巻 4 号 p. 674-678
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.
