Hot Deformation Behavior of Novel Al-Cu-Y(Er)-Mg-Mn-Zr Alloys

The compression tests in a temperature range of 400-540 & DEG;C and strain rates of 0.1-15 s(-1) were applied to novel Al-Cu-Y(Er)-Mg-Mn-Zr alloys to investigate their hot deformation behavior. The higher volume fraction of the intermetallic particles with a size of 0.5-4 mu m in the alloys caused an increase in flow stress. Hyperbolic sine law constitutive models were constructed for the hot deformation behavior of Al-Cu-Y(Er)-Mg-Mn-Zr alloys. Effective activation energy has a higher value in the alloys with Er than in the alloys with Y. According to the processing maps, the temperature range of 420-480 & DEG;C and strain rates higher than 5 s(-1) are the most unfavorable region for hot deformation for the investigated alloys. The deformation at 440 & DEG;C and 15 s(-1) led to cracks on the surface of the sample. However, internal cracks were not observed in the microstructure after deformation. The optimum hot deformation temperatures were in a range of 500-540 & DEG;C and at strain rates of 0.1-15 s(-1).

Automated summary

The hot deformation behavior of novel Al-Cu-Y(Er)-Mg-Mn-Zr alloys was investigated through compression tests at different temperatures and strain rates. The influence of intermetallic particles on flow stress was observed, leading to the establishment of hyperbolic sine law constitutive models for the alloys. Optimum hot deformation temperatures and conditions were determined for this alloy.