2195鋁鋰合金平面應變壓縮的流變行為與微觀組織

2195鋁鋰合金平面應變壓縮的流變行為與微觀組織Flow behavior and microstructure of 2195 Al-Li alloy during plane strain compression

通過Gleeble-3500熱模擬機在350~500？℃溫度范圍對2195鋁鋰合金進行平面應變壓縮實驗，應變速率為0.01~1？s-1，變形量60%。研究合金在高溫下的流變行為并通過背散射電子衍射(EBSD)和X射線衍射(XRD)揭示了微觀組織的演變規律。結果表明：流變應力隨應變速率的增加而升高，而隨著溫度的升高流變應力降低，并且達到峰值應力和穩態流變時所需的應變也減少，建立含有雙曲正弦關系的本構方程并得到合金的變形激活能Q為278.208？kJ/mol；隨著Zener-Hollomon參數值的增加，合金的流變集中增加，合金的軟化機制主要是動態回復，此外還有動態再結晶形成，動態再結晶主要為不連續動態再結晶，而連續動態再結晶和幾何動態再結晶均容易在較低Z值和較高Z值下形成；變形組織中含有大量的軋制織構，變形晶粒主要為S{123} 、Brass{011} 、Copper{112} 和Goss{011} 這4種取向。

Plane strain compression tests of AA2195 aluminum alloy were conducted on Gleeble-3500 system in the temperature range from 350 ℃ to 500 ℃ and at strain rate range from 0.01？s-1 to 1？s-1 with 60% thickness reduction. The flow behavior was studied in present work and the microstructure was revealed by electron backscatter diffractometry(EBSD) and X-ray diffractometry(XRD). The results show that the stress increases with the increase of strain rate whereas decreases with the increase of temperature, the peak strain and the critical strain for attaining steady state decreases with increasing temperature. A constitutive equation based on the hyperbolic sine equation is established with the deformation activation energy is calculated to be 278.208 kJ/mol. Flow localization increases with the increase of the value of Zener-Hollomon parameter, the basic softening mechanism is dynamic recovery(DRV), besides, dynamic recrystallization(DRX) occurs and is mainly discontinuous recrystallization(DDRX), continuous recrystallization(CDRX) and geometric recrystallization(GDRX) occurs more easily in lower Z value and higher Z value, respectively. Significant amounts of the major rolling texture components, namely, S{123} , Brass{011} , Copper{112} and Goss{011} are observed at deformed samples.

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