(1. 蘇州有色金屬加工研究院，蘇州 215026；2. 湖南大學 材料科學與工程學院，長沙 410082)
摘 要: 在Gleeble−1500熱模擬機上，當變形溫度為300~500 ℃、應變速率為0.01~10 s−1、真應變?yōu)?/FONT>0~0.8時，采用圓柱體等溫熱壓縮實驗研究5083鋁合金變形流變應力行為。通過分析流變應力指數(shù)函數(shù)中系數(shù)
、β與應變的關系，建立Zener-Hollomon參數(shù)的指數(shù)關系本構方程。運用該本構方程對5083鋁合金不同應變速率、變形溫度及應變條件下的流變應力進行預測，發(fā)現(xiàn)流變應力預測值與溫升修正值吻合得相當好。
關鍵字: 5083鋁合金；熱壓縮變形；溫升；流變應力；本構方程
（1. Suzhou Institute for Non-ferrous Metals Processing Technology,Suzhou 215026, China;2. School of Materials Science and Engineering, Hunan University,2. School of Materials Science and Engineering, Hunan University,2. School of Materials Science and Engineering, Hunan University,Changsha 410082, China）
Abstract:The flow stress behavior of 5083 aluminium alloy under hot compression deformation, in the temperature range of 300−500 ℃, strain rates of 0.01−10 s−1 and true strains of 0−0.8, was investigated by cylindrical compression tests on Gleeble 1 500 machine. The constitutive equations were presented considering the values of A and β as function of strain by Zener-Hollomon parameter in the exponential function form. Using the constitutive equations presented, the prediction of the flow stress in 5083 aluminium alloy as function of strain rate, temperature and strain shows to be in good agreement with the measured flow stresses corrected for temperature rise
Key words: 5083 aluminium alloy; hot compression deformation; temperature rise; flow stress; constitutive equations
