Abstract
It is unavoidable that Fe impurities will be mixed into Al alloys during recycling of automotive aluminum parts, and the Fe content has a significant effect on the mechanical properties of the recycled Al alloys. In this work, hot compression tests of two Fe-containing Al alloys were carried out at elevated temperatures within a wide strain rate range from 0.01 s−1 to 10 s−1. The effect of Fe content on the peak stress of the stress vs. strain curves, strain rate sensitivity and activation energy for dynamic recrystallization are analyzed. Results show that the recycled Al alloy containing 0.5 wt % Fe exhibits higher peak stresses and larger activation energy than the recycled Al alloy containing 0.1 wt % Fe, which results from the fact that there are more dispersed AlMgFeSi and/or AlFeSi precipitates in the recycled Al alloy containing 0.5 wt % Fe as confirmed by SEM observation and energy spectrum analysis. It is also shown that the Fe content has little effect on the strain rate sensitivity of the recycled Al alloys.
Highlights
Energy saving and emission reduction are the motivations of remanufacturing Al alloys recycled from automotive parts
The recycled Al alloy containing 0.5 wt % Fe requires larger activation energy for dynamic recrystallization of the alloy with a lower Fe content, which may be due to the fact that the Al alloy containing a higher Fe content exhibits larger flow stress
Casting ingots of recycled Al alloys containing 0.1 wt % Fe and 0.5 wt % Fe were prepared for Casting ingots of in recycled
Summary
Energy saving and emission reduction are the motivations of remanufacturing Al alloys recycled from automotive parts. The energy consumption of remanufacturing recycled Al alloys is only about. 2.8 kWh/kg [1], compared to 45 kWh/kg in producing Al alloys from pure Al. the emission of CO2 in remanufacturing of recycled Al alloy is only 5% of that when using pure Al to produce Al alloys. During the recycling and remanufacturing of automotive Al alloys, it is unavoidable that a certain amount of Fe will be mixed into the original Al alloys [3]. Das et al [4] and Adam et al [5] reported that the Fe content in Al alloy sheets remanufactured from recycled Al alloys can reach up to 1.0 wt %
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