首页|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

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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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析出相强化和θ′析出相强化.基于蠕变变形机理,通过将相互作用的微观结构变量(包括多种析出相的半径,位错密度和溶质浓度)引入蠕变应力应变模型,可以预测合金的"多阶段"蠕变行为.结果表明,模型的计算结果与实验数据吻合良好,验证该模型的有效性.
A unified constitutive model for multiphase precipitation and multi-stage creep ageing behavior of Al−Li−S4 alloy
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.

constitutive modellingAl−Li−S4 alloycreep age formingmicrostructuresnumerical algorithms

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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中南大学 轻合金研究院,长沙 410083

中南大学 机电工程学院,长沙 410083

中南大学 高性能复杂制造国家重点实验室,长沙 410083

北京宇航系统工程研究所,北京 100076

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本构模型 Al−Li−S4合金 蠕变时效成形 微观结构 数值算法

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaState Key Laboratory of High-performance Complex Manufacturing,ChinaFundamental Research Funds for the Central Universities of Central South University,China

2017YFB03063005167553851601060ZZYJKT2018-182018zzts151

2021

10.1016/S1003-6326(21)65573-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(5)
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