-1條件下的熱變形行為。結(jié)果表明：2060-T8E30鋁鋰合金在熱變形過(guò)程中,隨著溫度的升高和應(yīng)變速率的降低,其峰值應(yīng)力降低。合金的平均變形激活能為240.502 kJ/mol,平均應(yīng)變速率敏感指數(shù)為0.28。基于熱拉伸試驗(yàn)的真應(yīng)力-真應(yīng)變曲線,建立了具有應(yīng)變補(bǔ)償?shù)腁rrhenius本構(gòu)方程,模型的預(yù)測(cè)值與實(shí)驗(yàn)值平均相對(duì)誤差5.89%,模型的精確度較好。"/>

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2060-T8E30鋁鋰合金的熱變形行為及本構(gòu)模型研究
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南昌航空大學(xué)航空制造工程學(xué)院

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航空科學(xué)基金(2019ZE056009)，江西省重點(diǎn)研發(fā)計(jì)劃(20202BBEL53012)，輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室基金（EG201903175）


Study on Hot Deformation Behavior and Constitutive Model of 2060-T8E30 Al-Li Alloy
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Nanchang Aeronautical University

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    摘要:

    利用Sans CMT4104型電子萬(wàn)能實(shí)驗(yàn)機(jī)進(jìn)行等溫恒應(yīng)變速率熱拉伸試驗(yàn),研究了2060-T8E30鋁鋰合金在變形溫度425~500 ℃、應(yīng)變速率0.001~0.1 s-1條件下的熱變形行為。結(jié)果表明：2060-T8E30鋁鋰合金在熱變形過(guò)程中,隨著溫度的升高和應(yīng)變速率的降低,其峰值應(yīng)力降低。合金的平均變形激活能為240.502 kJ/mol,平均應(yīng)變速率敏感指數(shù)為0.28?；跓崂煸囼?yàn)的真應(yīng)力-真應(yīng)變曲線,建立了具有應(yīng)變補(bǔ)償?shù)腁rrhenius本構(gòu)方程,模型的預(yù)測(cè)值與實(shí)驗(yàn)值平均相對(duì)誤差5.89%,模型的精確度較好。

    Abstract:

    The thermal deformation behavior of 2060-T8E30 aluminum-lithium alloy at deformation temperature of 425 ~ 500 ℃ and strain rate of 0.001 ~ 0.1 s-1 was studied by using SansCMT4104 electronic universal experimental machine.The results show that the peak stress of 2060-T8E30 aluminum-lithium alloy decreases with the increase of temperature and the decrease of strain rate during thermal deformation.The average deformation activation energy of the alloy was 240.502kJ/mol, and the average strain rate sensitivity index was 0.28.Based on the true stress-true strain curve of the thermal tensile test, the Arrhenius constitutive equation with strain compensation was established. The average relative error between the predicted value and the experimental value of the model was 5.89%, showing a good accuracy of the model.

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于以標(biāo),陳樂(lè)平,徐勇,袁源平.2060-T8E30鋁鋰合金的熱變形行為及本構(gòu)模型研究[J].稀有金屬材料與工程,2021,50(12):4388~4394.[Yu Yibiao, Chen Leping, xu yong, Yuan Yuanping. Study on Hot Deformation Behavior and Constitutive Model of 2060-T8E30 Al-Li Alloy[J]. Rare Metal Materials and Engineering,2021,50(12):4388~4394.]
DOI：10.12442/j. issn.1002-185X.20200936

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  • 收稿日期:2020-12-04
  • 最后修改日期:2021-04-08
  • 錄用日期:2021-04-15
  • 在線發(fā)布日期: 2022-01-09
  • 出版日期: 2021-12-24