Abstract
Precipitation in deformed and un-deformed Al–300 ppm Fe alloy has been investigated by means of resistivity measurements and transmission electron microscopy. The un-deformed specimens were solution heat treated at 913 K for 3.6 ks, quenched into iced water and then aged at the temperatures between 393–848 K, while the deformed specimens were cold drawn or rolled at room temperature after the same solution heat treatment, and then aged. Resistivity in the un-deformed specimens decreased in two stages, while in the deformed specimens, resistivity decreased in two or three stages depending on aging temperatures. Time-Temperature-Precipitation (TTP) diagram for the un-deformed specimens consisted of one C-curve which corresponded to precipitation of stable Al3Fe. TTP diagram for the deformed specimens was separated into two C-curves: the curves in high and low temperature ranges corresponded to precipitation of Al3Fe and Al6Fe, respectively. Deformation accelerated precipitation of the metastable Al6Fe.
