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基于應(yīng)變補償和修正項的新型鋁鋰合金溫?zé)嶙冃伪緲?gòu)模型
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南京航空航天大學(xué),南京航空航天大學(xué),南京航空航天大學(xué),南京航空航天大學(xué)

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Constitutive Model of New Al-Li Alloy during Warm Deformation Considering Strain Compensation and Correction Term
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Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics

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    摘要:

    采用UTM5000電子萬能拉伸試驗機,在變形溫度573~648K和應(yīng)變速率0.001~0.1s-1條件下對2060-T8鋁鋰合金進行等溫恒應(yīng)變速率拉伸試驗，得到其在變形過程中的真應(yīng)力-真應(yīng)變曲線，建立了基于應(yīng)變補償和修正項的溫?zé)嶙冃伪緲?gòu)方程。通過掃描電子顯微鏡(SEM)分析拉伸斷口，對2060-T8鋁鋰合金的溫?zé)嶙冃涡袨檫M行研究。結(jié)果表明：2060-T8鋁鋰合金對變形溫度和應(yīng)變速率具有較高的敏感性，流變應(yīng)力曲線呈現(xiàn)出應(yīng)變硬化和流變軟化的特征，隨著變形溫度的升高和應(yīng)變速率的降低，穩(wěn)態(tài)流變特征逐漸消失，其在溫?zé)嶙冃螚l件下的斷裂形式為韌性斷裂。修正的本構(gòu)模型與實驗值吻合度較高，可以為2060-T8鋁鋰合金溫?zé)嶙冃蔚挠邢拊M提供前提條件。

    Abstract:

    Isothermal tensile tests of 2060-T8 Al-Li alloy were conducted on a UTM5000 electronic universal tensile testing machine at deformation temperature ranging from 573 to 648K and strain rate ranging from 0.001 to 0.1s-1. The true stress-strain curves of 2060-T8 Al-Li alloy were obtained and constitutive equation considering the strain compensation as well as correction term was also established. The warm deformation behavior of 2060-T8 Al-Li alloy was investigated by the analysis of tensile fractures using scanning electron microscopy (SEM). The results show that 2060-T8 Al-Li alloy is highly sensitive to deformation temperature and strain rate. The true stress-strain curves show the characteristics of strain hardening followed by flow softening and steady flow characteristic gradually disappears with the increase of deformation temperature and the decrease of strain rate. In addition, 2060-T8 Al-Li alloy is of ductile fracture during warm deformation. The modified constitutive model is in great agreement with the experimental data, which can provide a precondition for the finite element analysis of 2060-T8 Al-Li alloy during warm deformation.

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杜舜堯,陳明和,謝蘭生,陳燦.基于應(yīng)變補償和修正項的新型鋁鋰合金溫?zé)嶙冃伪緲?gòu)模型[J].稀有金屬材料與工程,2018,47(7):2113~2119.[Du Shunyao, Chen Minghe, Xie Lansheng, Chen Can. Constitutive Model of New Al-Li Alloy during Warm Deformation Considering Strain Compensation and Correction Term[J]. Rare Metal Materials and Engineering,2018,47(7):2113~2119.]
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  • 收稿日期:2016-06-23
  • 最后修改日期:2016-08-13
  • 錄用日期:2016-08-31
  • 在線發(fā)布日期: 2018-10-10
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