Electro-plasticity in Al-Cu eutectic alloys

Al-Cu 共晶合金的电塑性

• 批准号: 319419837
• 负责人: Professorin Dr. Sandra Korte-Kerzel, Ph.D.
• 金额: --
• 依托单位: Max-Planck-Institut für Eisenforschung GmbH (MPIE)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319419837?language=en
• 关键词: Electro; plasticity; Al; Cu; eutectic

The ultimate aim of this proposal within the SPP 'Manipulation of Matter Controlled by Electric and Magnetic Fields: Towards Novel Synthesis and Processing Routes of Inorganic Materials' is to unravel some of the underlying mechanisms facilitating enhanced plasticity during electro-mechanical deformation in otherwise brittle materials. To this end, an integrated computational materials engineering (ICME) approach is pursued by coupling a range of characterization techniques with mechanism-based multi-scale simulations in Al-Cu eutectic alloys. A better understanding of the electro-plastic effect in these alloys enables novel processing routes for more general metallic-intermetallic composite materials and thereby widening the technological application of this versatile class of materials. Complementary experimental and theoretical investigations of the electro-mechanical deformation behaviour of Al-Cu eutectic alloys are proposed with the aim to enhance the strength and formability of cast Al-Cu eutectic alloys. Specifically, we will synthesize Al-Cu alloys with varying microstructures using rapid alloy prototyping and characterize their electro-mechanical behaviour. Further, in-situ microscale electro-plasticity experiments using nano-indentation and micropillar compression will be performed to shed light on the influence of the electro-plastic effect in the different microstructural constituents. Meso- and microscale microstructure characterization using scanning electron microscopy, conventional and high resolution transmission electron microscopy, and atom probe tomography will be performed to investigate the local microstructural influence of the electro-plastic effect and correlate it with the macroscopic mechanical properties. All experimental data will be used as input and validation parameters for multi-scale simulations of the electro-plastic effect. Here the constitutive theory developed by Conrad et al. for the electron wind contribution to the plastic strain-rate will initially be used to adapt existing crystal plasticity constitutive laws. Additional factors such as joule heating and its effect on thermal expansion and softening will also be considered. The computational implementation will be performed within the flexible simulation toolkit DAMASK, and will be applied to study the electro-mechanical deformation mechanisms in relation to the underlying microstructure of the Al-Cu alloys.

该提案在SPP对电场控制的物质操纵中的最终目的：迈向新的无机材料的合成和加工途径，是为了揭示某些基本机制，从而促进了在其他脆性材料中电力变形过程中增强的可塑性。为此，通过将一系列特征技术与基于机制的多尺度仿真相连，可以追求一种集成的计算材料工程（ICME）方法。对这些合金中的电塑性效应的更好理解可以实现新的加工途径，以实现更一般的金属中层计算材料，从而扩大了这种多功能材料类别的技术应用。提出了对Al-Cu Eutectic合金的电力变形行为的互补实验和理论研究，目的是提高Cast al-Cu eutectic合金的强度和外形。具体而言，我们将使用快速合金原型制作与微观结构合成Al-Cu合金，并表征其电力机械行为。此外，将使用纳米识别和微柱压缩的原位显微镜电塑性实验，以阐明电塑性效应在不同的微观结构成分中的影响。将使用扫描电子显微镜，常规和高分辨率透射电子显微镜以及原子探针断层扫描进行中介质和微观显微结构表征，以研究电塑性效应的局部微观结构影响，并将其与巨型机械性能相关。所有实验数据将用作电塑性效应多尺度模拟的输入和验证参数。这里是Conrad等人开发的构成理论。对于电子对塑料应变率的贡献最初将用于适应现有的晶体可塑性本构定律。还将考虑其他因素，例如焦耳加热及其对热膨胀和软化的影响。计算实现将在灵活的仿真工具包中进行，并将应用于研究与Al-CU合金的基础微观结构有关的电力变形机制。