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High temperature flow behavior of extruded ZK60A alloy
H. Lee(이한주),M. Kawasaki(가와사키메구미),K. J. Jung(정기호),G. A. Lee(이근안),B. Ahn(안병민) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Tensile tests were conducted on a continuous-casted ZK 60A after extrusion at a range of strain rates at temperatures from 473 to 623K. It is shown that the alloy exhibits a quasi-superplastic behavior with a maximum recorded elongation of ~250% at 523K when testing with an initial strain rate of 1.0 x 10<SUP>-5</SUP> s<SUP>-l</SUP>. The experiments give a strain rate sensitivity of ~0.3-0.4 and an activation energy of ~108 kJ/mol. From the investigation, a high-temperature flow of the ZK 60A is controlled by a dislocation viscous glide process.