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Al-9.4Zn-1.9Mg-2.0Cu合金的熱變形流變行為與本構(gòu)方程
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有研工程技術(shù)研究院有限公司，有色金屬材料制備加工國家重點實驗室

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Flow behaviors and corresponding constitutive equation of the Al-9.4Zn-1.9Mg-2.0Cu alloy
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State Key Laboratory of Nonferrous Metals and Processes, GRIMAT Engineering Institute Co., Ltd.

Fund Project:

the National Key and Development Program of China (No. 2016YFB0300803, 2016YFB0300903)

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    摘要:

    本文對Al-9.39Zn-1.92Mg-1.98Cu合金做等溫?zé)崮M壓縮實驗，變形溫度為300 ℃~460 ℃，應(yīng)變速率為0.001 s-1~10 s-1，變形量為60%。結(jié)果表明：變形時,合金的流變應(yīng)力力隨著變形溫度的降低或應(yīng)變速率的增大而增大。由于熱變形時存在摩擦影響，對流變應(yīng)力曲線進行修正.結(jié)果發(fā)現(xiàn)摩擦修正后的應(yīng)力值低于實驗值，摩擦力對流變應(yīng)力的影響程度隨著溫度的降低和應(yīng)變速率的增大而增大?；诮?jīng)典的Arrhenius方程，考慮應(yīng)變量對材料常數(shù)(α，n，Q和A)的影響，構(gòu)建該合金在熱變形時的本構(gòu)方程。評價改進的本構(gòu)方程預(yù)測能力發(fā)現(xiàn)流變應(yīng)力值與實測值吻合度較高，其相關(guān)度高達93.5%。

    Abstract:

    Hot compression tests of the Al-9.39Zn-1.92Mg-1.98Cu alloy are carried out in the temperature range from 300 ?C to 460 ?C and the strain rate range from 0.001 s-1 to 1 s-1, and the height reduction degree is 70%. The flow stress is corrected because of the effect of friction. Results show the flow stress decreases with increasing the temperature increasing or decreasing the strain rate. The friction effect is more and more obvious when the temperature is low and the strain rate is high. A revised constitutive equation considering the influence of strain is established based on the Arrhenius-type model. Compared with the experimental and predicted flow stresses, the revised constitutive equation has a higher accuracy. Their correlation coefficient and average absolute relative error is 0.95 and 2.45%, respectively.

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石國輝,張永安,李錫武,李志輝,閆麗珍,閆宏偉,劉紅偉,熊柏青. Al-9.4Zn-1.9Mg-2.0Cu合金的熱變形流變行為與本構(gòu)方程[J].稀有金屬材料與工程,2019,48(9):2753~2758.[Guohui Shi, Yongan Zhang, Xiwu Li, Zhihui Li, Lizhen Yan, Hongwei Yan, Hongwei Liu, Baiqing Xiong. Flow behaviors and corresponding constitutive equation of the Al-9.4Zn-1.9Mg-2.0Cu alloy[J]. Rare Metal Materials and Engineering,2019,48(9):2753~2758.]
DOI：10.12442/j. issn.1002-185X. E20190007

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  • 收稿日期:2019-02-20
  • 最后修改日期:2019-07-01
  • 錄用日期:2019-05-09
  • 在線發(fā)布日期: 2019-10-09
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