(1.中南工業(yè)大學(xué)材料科學(xué)與工程系，長(zhǎng)沙410083；
2.北京有色金屬研究總院，北京100088；
3.東北輕合金加工，哈爾濱150060)
摘 要: 研究了2091鋁鋰合金的管材熱擠壓變形時(shí)的動(dòng)態(tài)回復(fù)與再結(jié)晶，擠壓變形參數(shù)與擠壓后亞晶尺寸間的關(guān)系。結(jié)果表明，鋁鋰合金熱擠壓時(shí)的主要恢復(fù)機(jī)制為動(dòng)態(tài)回復(fù)和動(dòng)態(tài)再結(jié)晶，但動(dòng)態(tài)再結(jié)晶需在一定條件下才能被激活。溫度是決定亞晶大小的最敏感參數(shù)。線性回歸表明，溫度補(bǔ)償應(yīng)變速率Z和亞晶尺寸d之間滿足Hall-Petch關(guān)系。
關(guān)鍵字: 鋁鋰合金 熱擠壓 回復(fù) 再結(jié)晶
OF2091Al-Li ALLOY
（1.Department of Materials Science and Engineering,
Central South University of Technology, Changsha 410083
2 Beijing General Research Institute for Nonferrous Metals, Beijing100088
3. Northeast Light Alloy Fabrication Plant, Harbin 150060）
Abstract:Dynamic recovery and dynamic recrystallization of 2091 Al-Li alloy tube during hot extrusion were studied. The relationship between extrusion processing parameters and subgrain size was demonstrated by introduction of temperature-compensation strain rateZand linear regression. The results showed that both dynamic recovery and dynamic recrystallizationare main restoration mechanism of hot extrusion of the alloy, however, dynamic recrystallization can only be activated under some conditions; temperature is the most sensitive parameter to the subgrain size of the alloy.
Key words: Al-Li alloy hot extrusion recovery recrystallization
