(中南大學(xué) 材料科學(xué)與工程系， 長沙 410083)
摘 要: 在Gleeble-1500熱模擬試驗機上，采用高溫等溫壓縮試驗，對7075鋁合金在高溫壓縮變形中的流變應(yīng)力行為進行了研究。結(jié)果表明，應(yīng)變速率和變形溫度的變化強烈地影響合金流變應(yīng)力的大小，流變應(yīng)力隨變形溫度升高而降低，隨應(yīng)變速率提高而增大；可用Zener-Hollomon參數(shù)的指數(shù)形式來描述7075鋁合金高溫壓縮變形時的流變應(yīng)力行為。
關(guān)鍵字: 7075鋁合金; 熱壓變形; 流變應(yīng)力
hot compressiondeformation
（Department of Materials Science and Engineering,
Central South University,Changsha 410083, P.R.China）
Abstract:The flow stress behavior of 7075 aluminum alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500 thermal-mechanical simulator. The results show that the flow stress is controlled by both strain rate and deforming temperature, the flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. The flow stress of 7075 alloy during high temperature deformation can be represented by a Zener-Hollomon parameter in exponential form.
Key words: 7075 aluminum alloy, hot compression deformation, flow stress
