Hybrid ultrafine grained materials produced by high pressure torsion extrusion

我们建议开发一种科学的方法，用于合成新的混合超细晶材料，具有高强度和高延展性的基础上，新开发的剧烈塑性变形（SPD）的加工技术，称为高压扭转挤压（HPTE）。这种混合材料是由两种或更多种成分组成的金属基复合材料。它们的性质是至关重要的内部结构，实现了HPTE处理沿着与并发纳米结构。结构化是指梯度材料的处理，即在样品的特定区域具有改性微观结构（有时是相组成）的材料，和/或引入具有特殊设计形状的结构元件（增强物）。有充分的理由期待这些材料将具有出色的机械，物理和功能特性，这对于可靠性和寿命问题方面的工程应用至关重要。作为模型材料，纯铜，铜银和铝合金以及普通碳钢将被用来演示各种内部试样结构。对加工、结构和机械性能的实验工作将通过数值模拟得到补充。除了测量杂化材料的机械性能外，还将通过XRD，EBSD/SEM以及常规和分析TEM来确定其结构的细节。作为该项目的结果，可以预期创新的加工技术。与墨尔本（澳大利亚，纳米结构混合材料理论）、梅斯（法国，微观结构模拟）和顿涅茨克（乌克兰，机械性能模拟）的大学进一步密切合作，完成了拟议的工作。

We propose to develop a scientific approach for the synthesis of new hybrid ultrafine-grained materials with high strength and ductility on the base of a newly developed severe plastic deformation (SPD) processing technique, referred to as High Pressure Torsion Extrusion (HPTE). Such hybrid materials are metal-based composites comprised of two or more constituents. Their properties are crucially determined by the inner architecture, achieved by HPTE processing along with concurrent nanostructuring. Architecturing means processing of gradient materials, i.e. materials with modified microstructure (and sometimes, phase composition) in particular areas of the sample, and/or introduction of structural elements (reinforcements) with specially designed shape. There is every reason to expect that these materials will possess outstanding mechanical, physical and functional properties, which is of crucial relevance for engineering applications in terms of reliability and lifetime issues. As model materials pure copper, Cu-Ag and Al alloys as well as plain carbon steel will be used to demonstrate various kinds of inner specimen architectures. The experimental work on the processing, structure and mechanical properties will be complemented by numerical simulations. Besides the measurements of mechanical properties of hybrid materials, the details of their structure will be determined by using XRD, EBSD/SEM, as well as conventional and analytic TEM. As a result of the project innovative processing techniques can be expected. Further close cooperation with universities in Melbourne (Australia, theory of nanostructured hybrid materials), Metz (France, microstructure simulations) und Donetsk (Ukraine, mechanical properties simulations) round up the proposed work.