Abstract: The hot deformation tests of AA2195 aluminum alloy were conducted on the thermal simulation equipment Gleeble-3500 by multi-pass under cylinder uniaxial compression in the temperature range of 400—450 ℃ ,strain rate of 0.01—0.1 s-1 and a total deformation of 80%. In the multi-pass compression process, the flow behavior and evolution of microstructure were studied by optical microscopy (OM) and electron backscatter diffraction (EBSD) microstructural characterization methods. The results showed that the flow stress of the alloy shows a static softening “peak valley” between the passes, and the softening rate increases with the increase of the compression pass and the temperature. The microstructure evolution among various passes of multi-pass under different deformation conditions show similar law: at the first pass, many substructures are formed; at the second pass, the transformation process of the small angle grain boundary to the large angle grain boundary is predominant, and small equiaxial dynamic recrystallization grains appear at the original grain boundary and the triple junctions; at the third pass, the continuous dynamic crystallization phenomenon is more obvious, the recrystallized grains also grow to varying degrees. At the same time, the high deformation temperature is more conducive to the formation of dynamic recrystallization, and softening effect of the alloy is also better.
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2019, Vol. 33 
