.5083 Aluminum Alloy High Temperature Deformation Behavior And Superplastic Behavior

In this paper,the behavior of 5083 aluminum alloy during hot compression deformation and the superplastic deformation with different Mg,Mn,Fe content have been studied by means of the isothermal compression simulation test,superplastic tensile text, metallographic microscope,SEM.The results show:1.the stress increase with the strain-rate at the same compression temperature,which show that 5083 aluminum alloy is a positive strain rate material,the stress decrease with the compression temperature at the same strain-rate,the deformation degree has little effect on the stress at the same deformation temperature and the same strain-rate.2.the flow stress of 5083 aluminum alloy during hot deformation can by expressed by Arrhenius function in the hyperhobic sine style. The values of A,a,n and Q in the analytical expression are 0.00818s^-1,0.0125MPa^-1,3.61389,107.36KJ/mol。3.the increase of Mn and Fe content of 5083 aluminum alloy has lead to more second phase particle formed by Al-Fe and Al- Mn intermetallic compound,which increase the growth of cavitation during superlastic deformation and the induced elongation.4.the strain-rate sensitivity of 5083 aluminum alloy with higher Mg,Mn and Fe content is smaller than strain rate sensitivity of alloy with lower Mg,Mn and Fe content at the same deformation temperature and strain rate.In spite of lower strain sensitivity,the m vs strain rate curves are more smoothly peaked for 5083 alloy with higher Mg,Mn and Fe content,the broader peaks in m suggest that it less sensitive to strain-rate.5.the average cavitation diameter of 5083 aluminum with lower Mg content is much smaller than the alloy with higher Mg content at the hot treatment condition during the superplastic deformation. Meanwhile,the larger strain sensitivity m lead to slow cavitation increasing rate in the superplastic deformation,the induced possibility of cavitation interlinkage,and it greatly effect the elongation.