Abstract
The microstructure transformations and deformation behavior of Al-Fe-Mn alloys with different Fe contents during their cold rolling process were investigated by means of hardness testing, conductivity testing, and transmission electron microscopy. It was observed that the hardness of the two alloys increased initially along with the levels of cold rolling reduction, then reduced when levels of cold rolling reduction increased further. Two kinds of deformation behaviors, work hardening and work softening, were observed during cold rolling for both Al-Fe-Mn alloys with different Fe contents. The critical level of cold rolling reduction that led to the change from work hardening to work softening was different in both alloys and the critical level of cold rolling reduction of the alloy with high Fe content was significantly lower than that of the alloy with low Fe content. During the work hardening process, the number of dislocations in the alloys increased continuously as the level of cold rolling reduction increased and they were accompanied by the formation of substructures. After the occurrence of work softening, the dislocation density in the alloys was significantly reduced. The sub-grain structures polygonized and ultimately transformed into equiaxed sub-grains.
Highlights
Al-Fe alloys have excellent mechanical properties, corrosion resistance, and formability.with addition of Mn, the strength of the Al-Fe alloys can be further enhanced without adverse effects on other properties
This paper investigates the deformation behavior and microstructure transformations of the two Al-Fe-Mn alloys with different Fe contents during the cold rolling process
The work softening behavior of alloy N1 with low Fe content appears at a higher level of cold rolling reduction and it abruptly changes from work hardening to work softening
Summary
Al-Fe alloys have excellent mechanical properties, corrosion resistance, and formability. With addition of Mn, the strength of the Al-Fe alloys can be further enhanced without adverse effects on other properties. In several previous studies [1,8,9,10,11,12,13], it was reported that Al-Fe alloys had the characteristic of work softening, which was influenced by the purity of their aluminum matrix, iron content, and processing method. Work softening of the Al-0.1/0.2/0.5/1.0/2.5Fe alloys prepared from 99.99% purity aluminum metal occurred during their cold rolling process. No softening of the Al-1.0Fe alloy occurred during its cold rolling process after solution treatment [8]
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