噴射成形7055鋁合金的熱變形行為和加工圖

噴射成形7055鋁合金的熱變形行為和加工圖Hot deformation behavior and processing map of spray formed 7055 aluminum alloy

通過高溫熱壓縮實驗研究噴射成形7055鋁合金的熱變形行為，實驗溫度為340~480 ℃，應變速率為0.001~1 s-1。結果表明：該合金在變形過程中的流變應力隨著溫度升高和應變速率的降低而降低，在480 ℃時會出現失穩(wěn)現象。變形過程中的主要軟化機制為動態(tài)回復和動態(tài)再結晶，其中低溫時，動態(tài)回復占主導地位，隨著溫度升高，軟化機制逐步轉變?yōu)閯討B(tài)再結晶，再結晶晶粒的尺寸隨著溫度的升高而增大?；趧討B(tài)材料模型和極化互惠模型，結合熱變形中的組織演變，確定該合金在應變量為0.7時的適宜加工范圍為：溫度范圍400~420 ℃，應變速率0.01~0.1 s-1，此時對應的動態(tài)材料模型加工圖能量耗散效率超過33%，極化互惠模型加工圖內在加工參數在65%~70%之間。

The hot deformation behavior of spray formed 7055 aluminum alloy was studied by a series of isothermal compression tests at different temperatures ranging from 340 ℃ to 480 ℃ and strain rates varying from 0.001 s-1 to 1 s-1. The results show that the flow stress decreases with increasing temperature and deceasing strain rate, and the instable behaviors occurs at 480 ℃. The main softening mechanisms are dynamic recovery and dynamic recrystallization. The dynamic recovery occurs at low temperature and it turns to dynamic recrystallization as temperature increases. The grain size increases with increasing temperature. Based on dynamic materials model, polar reciprocity model and microstructure evolution, the appropriate processing conditions for this alloy are in the strain rate range of 0.01–0.1 s-1 and deformation temperature range of 400–420 ℃, with power efficiency over 33% and intrinsic workability parameter of 65%–70%, respectively.

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