15%SiCP/8009鋁基復(fù)合材料熱壓縮流變應(yīng)力行為

15%SiCP/8009鋁基復(fù)合材料熱壓縮流變應(yīng)力行為Flow Stress Behavior of 15%SiCP/8009 Aluminum Matrix Composite During Hot Compression Deformation

采用Gleeble-3500熱模擬試驗(yàn)機(jī)對(duì)15%SiCP/8009鋁基復(fù)合材料在溫度為400~550 ℃和應(yīng)變速率為0.001~1 s-1條件下的熱變形流變行為進(jìn)行研究。結(jié)果表明： 流變應(yīng)力在開(kāi)始階段隨應(yīng)變的增加而增大，出現(xiàn)峰值后逐漸趨于平穩(wěn)；流變應(yīng)力隨溫度的升高而降低，隨應(yīng)變速率的增大而升高，呈現(xiàn)出正應(yīng)變速率敏感性；流變應(yīng)力行為可以用雙曲正弦模型來(lái)描述，其熱變形激活能為488.3853 kJ/mol，應(yīng)力指數(shù)為7.19022。

The flow stress behavior of 15%SiCP/8009 aluminum matrix composite at deformation temperature of 400-550 ℃ and strain rate of 0.001-1 s-1 was studied by hot compression testing on the Gleeble-3500 thermal-mechanical simulator. The results show that the flow stress increases initially and reaches a plateau after peak stress value with the increase of strain. The peak stress increases with the increase of strain rate and deformation temperature. The flow stress behavior can be described by the hyperbolic sine constitutive equation with the deformation activation energy Q of 488.3853 kJ/mol and the stress index n of 7.19022.