(湖南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410082)
摘 要: 采用Gleeble-1500熱模擬機(jī)對噴射沉積5A06鋁合金進(jìn)行等溫?zé)釅嚎s實驗， 變形溫度為300～500 ℃， 應(yīng)變速率為5×10-4～5×10-1 s-1， 最大變形程度為50%。 結(jié)果表明： 噴射沉積5A06鋁合金熱壓縮變形流變應(yīng)力受變形溫度和應(yīng)變速率的強(qiáng)烈影響， 可以用Zener-Hollomon參數(shù)的雙曲正弦函數(shù)形式進(jìn)行描述。 在本研究條件下， 噴射沉積5A06鋁合金熱壓縮變形時的熱變形激活能Q及應(yīng)力指數(shù)n均隨著應(yīng)變的增加而減小。 根據(jù)Zener-Hollomon本構(gòu)方程得出的流變應(yīng)力擬合值與實測值吻合較好。
關(guān)鍵字: 噴射沉積； 5A06鋁合金； 熱壓縮變形； 流變應(yīng)力； 本構(gòu)方程
（College of Materials Science and Engineering, Hunan University,
Changsha 410082, China）
Abstract: The hot compression tests of spray-deposited 5A06 aluminum alloy were performed on Gleeble-1500 machine at temperatures of 300-500 ℃ with constant strain rates of 5×10-4-5×10-1 s-1. The results show that the flow stress behaviors strongly depend on the deformation temperatures and strain rates, which can be represented by Zener-Hollomon parameter in the hyperbolic-sine-type equation. Both the hot deformation activation energy Q and the stress index n derived from the experiments decreases with the strain rate increasing. The predicted stresses agree well with experimental results.
Key words: spray deposition; 5A06 aluminum alloy; hot compression deformation; flow stress; constitutive equation
