(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083；
2. 中山市金勝鋁業(yè)有限公司，中山 528463)
摘 要: 在Gleeble−1500熱模擬機上對Al-Mn-Mg-Cu-Ni合金進行熱壓縮試驗，分析合金的流變應(yīng)力與應(yīng)變速率和變形溫度之間的關(guān)系，計算高溫變形時的變形激活能，并研究合金在變形過程中的顯微組織。結(jié)果表明：Al-Mn-Mg-Cu-Ni合金在本實驗條件下具有正的應(yīng)變速率敏感性；流變應(yīng)力隨應(yīng)變速率的增大而增大，隨變形溫度的升高而減小。該合金熱壓縮變形的流變應(yīng)力行為可用雙曲正弦形式的本構(gòu)方程來描述，也可用Zener-Hollomon參數(shù)來描述，其變形激活能為209.84 kJ/mol。隨著熱變形溫度的升高和應(yīng)變速率的減小，合金中的主要軟化機制逐步由動態(tài)回復(fù)轉(zhuǎn)變?yōu)閯討B(tài)再結(jié)晶。
關(guān)鍵字: Al-Mn-Mg-Cu-Ni合金；熱壓縮變形；流變應(yīng)力；顯微組織
Al-Mn-Mg-Cu-Ni alloy during hot compression deformation
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Jeoshion(zhongshan) Aluminium Factory, Zhongshan 528463, China）
Abstract:The hot compression deformation test of Al-Mn-Mg-Cu-Ni alloy was performed on Gleeble−1500 system. The relationships between flow stress and deformation temperature as well as strain rate were analyzed, and the deformation activation energy was calculated. The microstructures during the hot deformation process were observed. The results show that the flow stress is sensitive to the strain rate and the deforming temperature. The flow stress increases with increasing the strain rate, and decreases with increasing the deforming temperature, which can be described by a constitutive equation in hyperbolic sine function with the hot deformation activation energy of 209.84 kJ/mol, and can also be described by a Zener-Hollomon parameter. The main soften mechanism of the alloy transforms from dynamic recovery to dynamic recrystallization with increasing the temperature and decreasing the strain rate.
Key words: Al-Mn-Mg-Cu-Ni alloy; hot compression deformation; flow stress; microstructure
