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Reinforcement and damage mechanisms in three- and four-phase aluminum-matrix composites

三相和四相铝基复合材料的强化和损伤机制

基本信息

批准号：
329546524
负责人：
Professor Dr.-Ing. Giovanni Bruno
金额：
--
依托单位：
Fachbereich 8.5: Mikro-ZfP
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/329546524?language=en
关键词：
Reinforcement damage mechanisms three four

项目摘要

We will use synchrotron computed tomography and scanning electron microscopy to study the microstructural changes of three- and four-phase composites with Al-Mg-Si-alloy matrix, both after heat treatment and plastic pre-strain. It has been observed that the precipitated Si phase spherodises after heat treatment. Here we will investigate which consequence has this microstructure development on the mechanical properties of the composites. We will also investigate how the ceramic reinforcement (SiC particles and Al2O3 fibres) fails, and which consequences this failure has on the whole composite damage behavior.To the latter aim, in-situ neutron diffraction uniaxial compression and tension experiments will be carried out to disclose the load transfer between the various phases. Those experiments are supposed to directly show the effect of the microstructural changes on the mechanical properties of the composites. We will also determine phase specific residual stresses in the various composites.All experimental results will be input into a model capable of predicting phase specific stress also in amorphous phases (not detectable by neutron diffraction). The model will take into account realistic microstructures and residual stress, and will be used to predict the materials behavior under cyclic loading.

我们将使用同步辐射计算机断层扫描仪和扫描电子显微镜来研究Al-Mg-Si合金基体的三相和四相复合材料在热处理和塑性预应变后的显微组织变化。已经观察到，在热处理之后，析出的Si相球化。在这里，我们将调查的结果有这种微观结构的发展对复合材料的机械性能。我们还将研究陶瓷增强体（SiC颗粒和Al 2 O3纤维）是如何失效的，以及这种失效对整个复合材料损伤行为的影响。为了后者，将进行原位中子衍射单轴压缩和拉伸实验，以揭示各相之间的载荷传递。这些实验被认为是直接显示微观结构的变化对复合材料的力学性能的影响。我们还将确定在各种复合材料中的相特定的残余应力。所有的实验结果将被输入到一个模型中，该模型能够预测非晶相中的相特定的应力（不能通过中子衍射检测到）。该模型将考虑真实的微观结构和残余应力，并将用于预测循环载荷下的材料行为。