Breakage mechanism in heterogenous structures – combining microstructure of EnAM and breakage / liberation behavior

总体思想是生成新的工艺模型，其将关于包含例如部分非晶结构的EnAM系统的内部异质结构的信息与其宏观断裂概率相结合。为了了解EnAM系统的异质结构的断裂事件，它由非晶相和结晶相组成，从不同批次的炉渣生成的单颗粒进行调查。重点是细观和微观的影响，在变形和裂纹形成之前的断裂事件，以及对碎片的属性。碎片的表面分别提供了关于复合基质、炉渣内的原子键断裂的信息。在可压缩载荷下，含有几个EnAM晶粒的共生渣的弹性和塑性变形提供了关于局部保留的机械能的信息，该信息稍后将导致材料破裂。三个主要的实验方法将被应用：原位负载实验与计算机断层扫描（CT），AFM表征的断裂平面和统计验证实验与单次压缩测试。实验数据进行汇总和分析，以确定包含EnAM颗粒的初始颗粒以及破碎后该颗粒的所得碎片的特征结构特性。使用CT数据的颗粒是虚拟重建的碎片在3D中，所有的断裂面可以重建。比较断裂面与EnAM样品的初始结构，我们获得了关于穿晶或沿晶断裂发生的详细视图。在微观尺度上，AFM研究提供了关于断裂平面的拓扑结构的信息，这给出了相互作用几何形状的微观信息，这是第二FP中建模的基础。在此基础上，进一步深入理解了细观尺度下的破碎过程，建立了材料和过程模型。

The overall idea is to generate a new process model, which combines information about the inner heterostructure of the EnAM-system containing e.g. partially amorphous structures to its macroscopic breaking probability. To understand the breakage event of the heterostructure of the EnAM-system, which consist of amorphous and crystalline phases, investigations with single particles from different batches of slag generation are conducted. The focus is on the meso- and microscopic effects during deformation and crack formation prior to the breakage event and as well as on the properties of the debris. The surfaces of the fragments provide information on the rupture of the atomic bonds within the composite matrix, the slag respectively. The elastic and plastic deformation of the intergrown slag containing several EnAM grains under compressible load provides information about the locally retained mechanical energy, which later on will lead to the material rupture. Three main experimental methods will be applied: in-situ load experiments with computer tomography (CT), AFM characterization of the breakage planes and statistical validation experiments with single compression testing. The experimental data is aggregated and analyzed to identify characteristic structural properties of the initial particle containing EnAM-grains as well as of the resulting debris of that particle after breakage. Using the CT-data the particle is virtually rebuilt from the debris in 3D, for that all breakage planes can be reconstructed. Comparing the breakage planes with he initial structure of the EnAM-sample we obtain a detailed view on the occurrence of transgranular or intergranular breakage. In microscale the AFM investigations provide information about the topology of the breakage planes, which gives a microscopic information of interacting geometries, which are the basis for the modelling in the 2nd FP. Based on the data analysis, a deeper understanding of the breakage event in the micro- and meso-scale is deducted, which results in a material and process model.