铝合金触变压缩变形行为研究.pdf

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1
ratory of Electromagnetic Processing of Materials , Ministry of Education , Northeastern
University, Shenyang 110004 , China ; 2. School of Resources & Environmental Engineering , East China
University of Science and Technology , Shanghai 200237 , China. Correspondent : ZHI Li qun , E mail :
zhiliqun2008 ***@yahoo. cn)
Abstract : The thixo compression deformation behavior of three aluminum alloys prepared by
near liquidus casting were investigated on the Gleeble 3800 thermo mechanical simulator. The
true stress strain curves were modified considering the influence of thermal expansion on flowing
stress. The results showed that the true stress strain curves are all of the type of dynamic
recrystallization , and that the flowing stress decreases sharply with increasing strain mainly
because of the rapid collapse of solid skeleton under the action of external force with the liquid
squeezed out to the sample surface. The peak stress is affected obviously by deformation
temperature , strain rate , strain and initial strength of materials , while the steady stress is just
affected obviously by the initial strength of materials. The peak strain value is around 0. 06 , and
the steady strain value is betwe