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首页> 外文期刊>Journal of Materials Science >Crystal plasticity-based finite element analysis of deformation and fracture of polycrystalline lamellar gamma-Tial + alpha(2)-Ti(3)al alloys
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Crystal plasticity-based finite element analysis of deformation and fracture of polycrystalline lamellar gamma-Tial + alpha(2)-Ti(3)al alloys

机译:基于晶体塑性的多晶层状γ-Tial+ alpha(2)-Ti(3)al合金变形和断裂的有限元分析

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Deformation behavior of fully-lamellar polycrystalline gamma-TiAl + alpha(2)-Ti3Al alloys has been analyzed using a finite element method. A three-dimensional rate-dependent, finite-strain, crystal-plasticity based materials constitutive model is used to represent the deformation behavior of the bulk material. The constitutive behavior of gamma-TiAl/gamma-TiAl lamellar interfaces and lamellae-colony boundaries, on the other hand, are modeled using a cohesive-zone formulation. The interface/boundary potentials used in this formulation are determined through the use of atomistic simulations of the interface/boundary decohesion. The constitutive relations for both the gamma-TiAl + alpha(2)-Ti3Al bulk material and the lamellar interfaces and colony boundaries are implemented in the commercial finite element program Abaqus/Standard within which the material state is integrated using an Euler-backward implicit formulation. The results obtained show that plastic flow localizes into deformation bands even at an overall strain level of only 0.5% and that incompatibilities in plastic flow between the adjacent colonies can give rise to high levels of the hydrostatic stress and, in turn, to intercolony fracture. Furthermore, it is found that when lamellar interfaces are admitted into colonies, fracture is delayed and the materials fail in a more gradual manner. (C) 2003 Kluwer Academic Publishers. [References: 35]
机译:全层多晶γ-TiAl+α(2)-Ti3Al合金的变形行为已使用有限元方法进行了分析。基于三维速率的有限应变,基于晶体塑性的材料本构模型用于表示块状材料的变形行为。另一方面,γ-TiAl/γ-TiAl层状界面和层状集落边界的本构行为是使用内聚区公式化的。通过使用界面/边界去内聚的原子模拟确定在该配方中使用的界面/边界电势。 γ-TiAl+ alpha(2)-Ti3Al块状材料以及层状界面和菌落边界的本构关系在商业有限元程序Abaqus / Standard中实现,其中使用Euler-backward隐式公式积分了材料状态。获得的结果表明,即使在总应变水平仅为0.5%的情况下,塑性流也位于变形带中,相邻菌落之间塑性流的不相容性会导致较高的静水压力,进而导致菌落间断裂。此外,发现当层状界面进入菌落时,破裂被延迟并且材料以更渐进的方式失效。 (C)2003 Kluwer学术出版社。 [参考:35]

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