Effect of Tensile Prestrain on Low-Temperature Ductility of Fe-Cu Alloy

Abstract

The effect of prestrain on the low-temperature ductility of Fe-1.83%Cu alloywas investigated as a function of prestrain temperature, prestrain quantity, and tensile testing temperature.
Ductility of solution-treated Fe-1.83%Cu alloy at 77K decreased about 20% with increasing prestrain at room temperature, whereas, ductility of aged Fe-1.83%Cu alloy (25h at 700°C) increased about 10% at 120 and 77K, after prestrain of 2.4% at room temperature. However, the ductility did not increase, after any prestrain at 153K.
Dislocation structure produced by prestrain of 2.4% at room temperature was observed, after 5% deformation at 77K for aged Fe-1.83%Cu alloy (96h at 700°C), but not for solution-treated Fe-1.83%Cu alloy.