High Temperature Deformation Behavior of Pre-Sintered Al-10Si-5Fe Based Alloy

Dong  Suk Lee; Taek Kyun Jung; Gyu-Sam Shim; Mok Soon Kim; Won Yong Kim; Hiroshi Yamagata

doi:10.4028/www.scientific.net/MSF.510-511.342

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High Temperature Deformation Behavior of Pre-Sintered Al-10Si-5Fe Based Alloy

Abstract:

The mechanical properties of pre-sintered Al-10Si-5Fe-1Cu-0.5Mg-1Zr (wt%) alloy were investigated in the temperature range from 673K to 813K and at initial strain rates from 10-4 to 100 s-1. In the high temperature range of 793K and 813K, the strain rate sensitivity index was close to that for superplasticity (0.3). Stress exponent was estimated to be 2 and 5 in the temperature range from 793K to 813K and from 673K to 773K, respectively. The activation energies for the plastic flow were calculated to 77kJ/mol for the n=2 region and 127kJ/mol for the n=5 region. These values were close to that for grain boundary diffusion and self-diffusion in pure aluminum, respectively. We found that a dynamic recrystallization (DRX) and grain boundary sliding (GBS) occur depending on the test temperature and stain rate. A filament-like phase containing Cu and Mg was observed in the cracked surface of the specimen deformed at 793K and 813K.