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

总体思路是建立一个新的过程模型，该模型将含有部分非晶结构的ename -体系的内部异质结构信息与其宏观断裂概率相结合。为了了解由非晶相和晶相组成的ename -体系的异质结构的破坏事件，对不同批次产渣的单个颗粒进行了研究。重点是在破碎事件之前的变形和裂纹形成过程中的细观和微观效应，以及碎片的性质。碎片的表面分别提供了复合基体和渣内原子键断裂的信息。含有多个EnAM颗粒的混杂矿渣在压缩载荷作用下的弹塑性变形提供了局部保留机械能的信息，而这些机械能随后会导致材料破裂。将采用三种主要的实验方法：计算机断层扫描（CT）的原位载荷实验、破碎面AFM表征和单次压缩试验的统计验证实验。对实验数据进行汇总和分析，以确定含有ame -颗粒的初始颗粒以及该颗粒破碎后产生的碎片的特征结构特性。利用ct数据从碎片中虚拟重建三维颗粒，因为所有的破碎面都可以重建。将破碎面与试样的初始结构进行比较，得到了穿晶或晶间破碎的详细情况。在微观尺度上，AFM研究提供了有关断裂面拓扑结构的信息，从而提供了相互作用几何的微观信息，这是第二FP建模的基础。在数据分析的基础上，对断裂事件在微观和中观尺度上有了更深入的理解，得到了材料和工艺模型。

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.