Abstract
A hot compression test of new Al-6Mg and Al-8Mg alloys was conducted to understand the dynamic recrystallization (DRX) behavior by Mg contents. To investigate the hot workability of Al-Mg with high Mg contents, the hot deformation behavior of Al-6Mg and Al-8Mg alloys was analyzed by a hot compression test in the temperature range of 300–450 °C, and the strain rate range of 10−3–100/s. Subsequently, high-temperature deformation behavior was investigated through the processing map and microstructure observation. In this study, the results have shown that, as the Mg contents increase, the maximum and yield strength increase while rapid flow softening after the peak strain has been observed due to accelerated dynamic recrystallization (DRX). Finally, the increase of Mg contents affects an increase of heat dissipation efficiency to be an indicator of regular deformation.
Highlights
IntroductionMany researchers have investigated a method to improve the fuel efficiency of the automotive industry
Since the last century, many researchers have investigated a method to improve the fuel efficiency of the automotive industry
This phenomenon is generally shown in material processing because the dislocation glide becomes easier at higher temperatures and lower stresses [22,23,24]
Summary
Many researchers have investigated a method to improve the fuel efficiency of the automotive industry. In order to improve the fuel efficiency, the weight reduction of vehicles has been considered as one of the methods. Al alloys are considered good substitutes for conventional materials, such as steel, due to its much lighter weight. As the early stage of weight reduction research for the vehicle, cast parts such as engine blocks in automobiles were replaced first. Al-Mg alloys typically exhibit relatively poor formability than steel because of their plastic anisotropy, high stacking fault energy, and negative strain rate sensitivity (nSRS), which causes instability during low temperature deformation [5,6,7]. High Mg content in Al alloys is not fabricated by conventional manufacturing processes because of their accelerated oxidation rate and high deformation resistance at elevated temperatures. In order to overcome these difficulties, several Al-Mg with high
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