-1條件下的熱變形行為。修正了應(yīng)變-應(yīng)力曲線中由于變形熱引起的流動(dòng)軟化現(xiàn)象后，利用Arrhenius本構(gòu)方程和熱加工圖預(yù)測(cè)并分析了Al-xMg-8Zn合金的熱變形行為。結(jié)果表明，隨著Mg含量的增加，應(yīng)變速率的升高，或者變形溫度的降低，流變應(yīng)力隨之增大。結(jié)合熱加工圖和微觀組織觀察，確定了合金的最佳熱加工參數(shù)范圍。通過對(duì)比發(fā)現(xiàn)，隨著Mg含量的增加，最佳熱變形溫度和應(yīng)變速率范圍均變大，變形失穩(wěn)區(qū)域向高溫和低應(yīng)變速率區(qū)域擴(kuò)展。"/>

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基于本構(gòu)方程和熱加工圖的Al-xMg-2.8Zn合金的熱變形行為研究
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1.北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100083;2.北京科技大學(xué) 現(xiàn)代交通金屬材料與加工技術(shù)北京實(shí)驗(yàn)室，北京 100083

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基金項(xiàng)目:

the Major State Research and Development Program of China (2016YFB0300801), the National Natural Science Foundation of China (51971019 and 51571013)


Study on Hot Deformation Behavior of Al-xMg-2.8Zn Alloy by Constitutive Equations and Processing Maps
Author:
Affiliation:

1.State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2.Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China

Fund Project:

Major State Research and Development Program of China (2016YFB0300801); National Natural Science Foundation of China (51971019, 51571013)

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    摘要:

    通過熱壓縮模擬試驗(yàn)研究了Al-xMg-2.8Zn合金在變形溫度為300~490 ℃、應(yīng)變速率為0.001~5 s-1條件下的熱變形行為。修正了應(yīng)變-應(yīng)力曲線中由于變形熱引起的流動(dòng)軟化現(xiàn)象后，利用Arrhenius本構(gòu)方程和熱加工圖預(yù)測(cè)并分析了Al-xMg-8Zn合金的熱變形行為。結(jié)果表明，隨著Mg含量的增加，應(yīng)變速率的升高，或者變形溫度的降低，流變應(yīng)力隨之增大。結(jié)合熱加工圖和微觀組織觀察，確定了合金的最佳熱加工參數(shù)范圍。通過對(duì)比發(fā)現(xiàn)，隨著Mg含量的增加，最佳熱變形溫度和應(yīng)變速率范圍均變大，變形失穩(wěn)區(qū)域向高溫和低應(yīng)變速率區(qū)域擴(kuò)展。

    Abstract:

    The hot deformation behavior of Al-xMg-2.8Zn alloys at deformation temperature of 300~490 °C, strain rate of 0.001~5 s-1 was studied by isothermal hot compression tests. After correcting the flow softening from deformation heating in stress-strain curves, Arrhenius-type constitutive equations and processing maps were used to predict and analyze the hot deformation behavior of Al-xMg-2.8Zn alloys. The results show that the flow stress increases with increasing Mg content and strain rate or decreasing temperature. According to the processing maps and corresponding microstructure of alloys, the range of optimum hot deformation parameters of alloys is determined. The range of hot deformation temperature and strain rate both extend and the instability domains extend to the zone of higher temperature and lower strain rate with increasing the Mg content.

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姚晶晶,張迪,張濟(jì)山.基于本構(gòu)方程和熱加工圖的Al-xMg-2.8Zn合金的熱變形行為研究[J].稀有金屬材料與工程,2022,51(6):2046~2055.[Yao Jingjing, Zhang Di, Zhang Jishan. Study on Hot Deformation Behavior of Al-xMg-2.8Zn Alloy by Constitutive Equations and Processing Maps[J]. Rare Metal Materials and Engineering,2022,51(6):2046~2055.]
DOI：10.12442/j. issn.1002-185X.20210288

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  • 收稿日期:2021-04-02
  • 最后修改日期:2021-11-01
  • 錄用日期:2022-01-22
  • 在線發(fā)布日期: 2022-06-29
  • 出版日期: 2022-06-29