The effect of stress state on high-temperature deformation of fine-grained aluminum–magnesium alloy AA5083 sheet

✍ Scribed by Eric M. Taleff; Louis G. Hector Jr.; John R. Bradley; Ravi Verma; Paul E. Krajewski

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 554 KB
• Volume: 57
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2009.02.036

✦ Synopsis

The effect of stress state on high-temperature deformation of fine-grained aluminum-magnesium alloy AA5083 sheet is investigated over a range of temperatures and strain rates for which the grain-boundary-sliding and solute-drag creep mechanisms govern plastic flow. Experimental data from uniaxial tension and biaxial tension are used in conjunction with finite-element-method simulations to examine the role of stress state. Three different material constitutive models derived from uniaxial tensile data are used to simulate bulge-forming experiments. Comparison of simulation results with bulge-forming data indicates that stress state affects grain-boundary-sliding creep by increasing creep rate as hydrostatic stress increases. Thus, creep deformation is faster under biaxial tension than under uniaxial tension for a constant effective stress. No effect of stress state is observed for solute-drag creep. A new material model that accounts for the effect of stress state on grain-boundary-sliding creep is proposed.