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.

SPP“电场和磁场控制的物质的操纵：无机材料的新型合成和加工路线”中该提案的最终目标是揭示一些促进脆性材料在机电变形过程中增强塑性的潜在机制。为此，通过将一系列表征技术与 Al-Cu 共晶合金中基于机制的多尺度模拟相结合，寻求一种集成计算材料工程 (ICME) 方法。更好地了解这些合金中的电塑性效应，可以为更通用的金属-金属间复合材料提供新颖的加工路线，从而扩大这种多功能材料的技术应用。提出了 Al-Cu 共晶合金机电变形行为的补充实验和理论研究，旨在提高铸造 Al-Cu 共晶合金的强度和成形性。具体来说，我们将使用快速合金原型合成具有不同微观结构的 Al-Cu 合金，并表征其机电行为。此外，将进行使用纳米压痕和微柱压缩的原位微观电塑性实验，以阐明不同微观结构成分中电塑性效应的影响。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细观和微观微观结构表征，以研究电塑性效应对局部微观结构的影响，并将其与宏观机械性能相关联。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。这里康拉德等人发展的本构理论。对于电子风对塑性应变率的贡献，最初将用于适应现有的晶体塑性本构定律。还将考虑其他因素，例如焦耳热及其对热膨胀和软化的影响。计算实施将在灵活的模拟工具包 DAMASK 中进行，并将应用于研究与 Al-Cu 合金底层微观结构相关的机电变形机制。