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Failures analysis of in-situ Al-Mg_2Si composites using actual microstructure based model

机译：使用基于实际微结构的模型的原位AL-MG_2SI复合材料的故障分析

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摘要

In-situ Al-Mg_2Si composites (0, 5, 10, 15, 20 wt% Mg_2Si) were synthesized in an Al-Mg-Si system through gravity casting route. Influences of the Mg_2Si addition (in terms of Mg and Si) on the mechanical properties, microstructural morphology, fracture behaviors, micro-mechanical response and failure initiation were systematically studied through experiments and mathematical modeling. Experimental results show that the primary Mg_2Si formed in Al-10 wt% Mg_2Si composite and the volume percentage and size of primary Mg_2Si particles are increasing with an increase in Mg_2Si concentration in the composite. The Mg_2Si reinforcement significantly improves ultimate tensile strength (UTS), hardness and yield strength (YS) of the composite, but unwantedly the elongation decreased. Fracture surface analysis reveals that the composites have both the ductile and brittle mode of fracture and the amount of brittle fracture increased with an increase in reinforcing phase (Mg_2Si) concentration. The fracture mode for the Mg_2Si particles includes matrix yielding, decohesion, particle fracture. The deformation plasticity (Ramberg-Osgood) model was considered to investigate the micro-mechanical response under tension. Actual microstructure two-dimensional (2D) representative volume element (RVE) models have been developed to investigate the deformation and failure phenomenon of the composites. The FE analysis results have a great concurrence with the experimental one. It established that the composite's strength and failure initiation regions increased and the elongation decreased with an increase in Mg_2Si concentration. It is noted that the eutectic Mg_2Si morphology is the cause for failure initiation and then primary Mg_2Si drive the final failure of the Al-Mg_2Si composites.
机译：通过重力铸造路线在Al-Mg-Si系统中合成原位Al-Mg_2SI复合材料（0,5,10,15,20wt％Mg_2Si）。通过实验和数学建模系统地研究了MG_2SI添加（根据Mg和Si）对机械性能，微观结构形态，断裂行为，微机械反应和失效引发的影响。实验结果表明，在Al-10wt％Mg_2Si复合材料中形成的初级Mg_2Si和初级Mg_2SI颗粒的体积百分比和大小随着复合材料中Mg_2Si浓度的增加而增加。 Mg_2SI加强件显着提高了复合材料的最终拉伸强度（UTS），硬度和屈服强度（YS），但是不需要的伸长率降低。断裂表面分析显示，复合材料具有延性和脆性模式，脆性骨折的量随着增强相（Mg_2Si）浓度的增加而增加。 Mg_2SI颗粒的断裂模式包括基质屈服，脱粘，颗粒骨折。被认为变形塑性（Ramberg-Osgood）模型研究了张力下的微机械反应。已经开发了实际微观结构二维（2D）代表体积元件（RVE）模型以研究复合材料的变形和失效现象。 Fe分析结果与实验性均匀同时发生。正建立复合材料的强度和失效启动区增加，伸长率随着Mg_2SI浓度的增加而降低。应注意，共晶Mg_2SI形态是失败启动的原因，然后初级Mg_2SI驱动Al-Mg_2SI复合材料的最终失效。

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