Analysis of the Stability of High Entropy Alloys by Dewetting of Thin Films

薄膜去湿分析高熵合金的稳定性

• 批准号: 316306182
• 负责人: Professor Dr. Gerhard Dehm
• 金额: --
• 依托单位: Centre Interdisciplinaire de Nanoscience de Marseille
• 依托单位国家: 德国
• 项目类别: Research Grants
• 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/316306182?language=en
• 关键词: Analysis; Stability; Entropy; Alloys; Dewetting

High-Entropy Alloys (HEAs) are a new class of materials, with the potential to realize exceptional combinations of mechanical, electrical and thermal properties unachievable by conventional alloys. They contain about equal amounts of at least five elements, and can surprisingly crystallize as single fcc or bcc solid solutions. A better knowledge of the metallurgical and physical behavior of those materials is a prerequisite to understand their property combinations. Eventually it will foster the development of reliable HEA thin films for innovative technology drivers such as the microelectronic industry, and of bulk HEAs. Since HEA stability is suggested to depend strongly on material defects, a consortium of experts will address HEA thin film phase stability by systematically manipulating 1D and 2D defects. The defect density in the films will be controlled by (i) nano-/microscale deformation to introduce gradients in the dislocation density, (ii) altering the interface structure by employing amorphous and single crystalline substrates and (iii) varying film growth and processing conditions to manipulate the grain size. The joint French-German team merges the recognized expertise in different fields of materials science of four complementary partners (combinatorial thin film synthesis, microstructure physics, thermodynamics and mechanics of materials) to investigate the following fundamental issues on HEA films: (i) HEA phase stability, (ii) phase evolution and corresponding kinetics including influence of composition, defects (dislocations, interfaces, grain boundaries) and dimensional constraints (film thickness, patterning) on phase stability, (iii) grain growth and texture, (iv) dewetting kinetics and morphologies, (v) temperature and microstructure-stress evolution, (vi) plastic deformation, (vii) thermo-mechanical fatigue mechanisms and lifetimes. AHEAD will focus on thin films of bcc-AlCrFeCoNi and fcc-MnCrFeCoNi as generic examples for two different crystal structures. Film synthesis, a key issue, will be performed by combinatorial deposition by one partner. The three other partners will address the mechanisms controlling the phase, microstructure and morphological stability of the HEA films during isothermal and cyclic thermo-mechanical annealing as a function of their thickness, composition and defect structure. Advanced experimental tools - from combinatorial thin film deposition and high-throughput characterization to multiscale quantitative microstructure analysis and miniaturized mechanical techniques - will be used and combined with the complementary expertise of the four partners, to provide for the first time a large and consistent data set on the thermodynamic, mechanical, microstructural and morphological stabilities of two types of HEA films.Within the AHEAD project, 2 PhD students and 2 postdoctoral fellows will benefit from a multidisciplinary working conditions, and international exchanges.

高渗透合金（HEAS）是一种新的材料，有可能实现常规合金无法实现的机械，电和热性能的异常组合。它们包含大约相同数量的至少五个元素，并且可以令人惊讶地将其作为单个FCC或BCC实心溶液结晶。更好地了解这些材料的冶金和物理行为是了解其特性组合的先决条件。最终，它将为创新的技术驱动力（例如微电子产业和散装Heas）促进可靠的He -The Film膜的开发。由于提出HEA稳定性在很大程度上取决于物质缺陷，因此专家联盟将通过系统地操纵1D和2D缺陷来解决He -Thin薄膜相位稳定性。膜中的缺陷密度将由（i）纳米/显微镜变形控制，以在脱位密度中引入梯度，（ii）通过采用无定形和单晶底物以及（iii）变化的膜生长和加工条件来改变界面结构以操纵晶粒尺寸。 The joint French-German team merges the recognized expertise in different fields of materials science of four complementary partners (combinatorial thin film synthesis, microstructure physics, thermodynamics and mechanics of materials) to investigate the following fundamental issues on HEA films: (i) HEA phase stability, (ii) phase evolution and corresponding kinetics including influence of composition, defects (dislocations, interfaces, grain boundaries) and dimensional （iii）（iii）晶粒生长和质地，（iv）脱湿动力学和形态学的约束（薄膜厚度，图案），（v）温度和微观结构压力增强，（vi）塑性变形，（VII）热力学疲劳机制和生命。领先于BCC-Alcrfeconi和FCC-MNCRFECONI的薄膜作为两个不同晶体结构的通用示例。胶片合成是一个关键问题，将由一个伙伴组合沉积执行。其他三个伴侣将解决控制在等温和循环热机电上的层，微观膜的相，微结构和形态稳定性的机制，这是其厚度，组成和缺陷结构的函数。先进的实验工具 - 从组合薄膜沉积和高通量表征到多尺度定量微观结构分析和微型机械技术 - 将与四个合作伙伴的互补专业知识一起使用并结合使用，以首次提供在热力学，机械，机械，微观结构和培训两种类型上的大型且一致的数据。博士后研究员将从多学科的工作条件和国际交流中受益。

项目成果

Accelerated atomic-scale exploration of phase evolution in compositionally complex materials

• DOI: 10.1039/c7mh00486a
• 发表时间: 2018-01-01
• 期刊: MATERIALS HORIZONS
• 影响因子: 13.3
• 作者: Li, Y. J.;Savan, A.;Ludwig, A.
• 通讯作者: Ludwig, A.

Modeling grain boundary and surface segregation in multicomponent high-entropy alloys

• DOI: 10.1103/physrevmaterials.3.054004
• 发表时间: 2019-05
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: P. Wynblatt;D. Chatain

Structure Zone Investigation of Multiple Principle Element Alloy Thin Films as Optimization for Nanoindentation Measurements

• DOI: 10.3390/ma13092113
• 发表时间: 2020-05
• 期刊: Materials
• 影响因子: 3.4
• 作者: A. Savan;Timo Allermann;Xiao Wang;Dario Grochla;Lars Banko;Y. Kalchev;A. Kostka;J. Pfetzing‐Micklich;A. Ludwig

Structure and hardness of in situ synthesized nano-oxide strengthened CoCrFeNi high entropy alloy thin films

• DOI: 10.1016/j.scriptamat.2021.114044
• 发表时间: 2021-02
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Subin Lee;D. Chatain;C. Liebscher;G. Dehm

Correlative chemical and structural investigations of accelerated phase evolution in a nanocrystalline high entropy alloy

• DOI: 10.1016/j.scriptamat.2020.03.016
• 发表时间: 2020-07
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Y. J. Li;A. Kostka;A. Savan;A. Ludwig