| Al−Li−S4合金多相析出和多阶段蠕变时效行为的统一本构模型 |
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| 引用本文： | 李贺,湛利华,黄明辉,赵兴,周畅,胡立彬,胡正根,刘德博.Al−Li−S4合金多相析出和多阶段蠕变时效行为的统一本构模型[J].中国有色金属学会会刊,2021,31(5):1217-1234. |
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| 作者姓名： | 李贺 湛利华 黄明辉 赵兴 周畅 胡立彬 胡正根 刘德博 |
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| 摘 要： | 提出统一的本构模型,以预测最近观察到的Al?Li?S4合金的"多阶段"蠕变行为.通过X射线衍射(XRD)和透射电子显微镜(TEM),详细表征蠕变时效过程中与合金的屈服强度和蠕变变形相关的微观结构变量,包括位错和多种析出相.对于合金的屈服强度,该模型基于强化机制考虑多相强化行为,包括可剪切的T1析出相强化,不可剪切的T1...
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| 关 键 词： | 本构模型 Al-Li-S4合金 蠕变时效成形 微观结构 数值算法 |
| 收稿时间： | 2 May 2020 |
A unified constitutive model for multiphase precipitation and multi-stage creep ageing behavior of Al-Li-S4 alloy |
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| He LI,Li-hua ZHAN,Ming-hui HUANG,Xing ZHAO,Chang ZHOU,Li-bin HU,Zheng-gen HU,De-bo LIU.A unified constitutive model for multiphase precipitation and multi-stage creep ageing behavior of Al-Li-S4 alloy[J].Transactions of Nonferrous Metals Society of China,2021,31(5):1217-1234. |
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| Authors: | He LI Li-hua ZHAN Ming-hui HUANG Xing ZHAO Chang ZHOU Li-bin HU Zheng-gen HU De-bo LIU |
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| Affiliation: | 1. Light Alloy Research Institute, Central South University, Changsha 410083, China;2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;3. State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China;4. Beijing Institute of Astronautic Systems Engineering, Beijing 100076, China |
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| Abstract: | A unified constitutive model is presented to predict the recently observed “multi-stage” creep behavior of Al-Li-S4 alloy. The corresponding microstructural variables related to the yield strength and creep deformation of the alloy during the creep ageing process, including dislocations and multiple precipitates, have been characterized in detail by X-ray diffraction (XRD) and transmission electron microscopy (TEM). For the yield strength, the model considers the multiphase strengthening behavior of the alloy based on strengthening mechanisms, which includes shearable T1 precipitate strengthening, non-shearable T1 precipitate strengthening and θ′ precipitate strengthening. Based on creep deformation mechanism, the “multi-stage” creep behavior of the alloy is predicted by introducing the effects of interacting microstructural variables, including the radius of multiple precipitates, dislocation density and solute concentration, into the creep stress-strain model. It is concluded that the results calculated by the model are in a good agreement with the experimental data, which validates the proposed model. |
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| Keywords: | constitutive modelling Al-Li-S4 alloy creep age forming microstructures numerical algorithms |
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