Optimizing the mechanical properties of variations of Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy

优化 Al10Co25Cr8Fe15Ni36Ti6 成分复杂合金的力学性能

• 批准号: 316699240
• 负责人: Professor Dr.-Ing. Uwe Glatzel
• 金额: --
• 依托单位: Lehrstuhl Metallische Werkstoffe
• 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 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316699240?language=en
• 关键词: Optimizing; mechanical; properties; variations; Al10Co25Cr8Fe15Ni36Ti6

"Compositionally complex alloy/high entropy alloy" Al10Co25Cr8Fe15Ni36Ti6 and its variations with trace elements Hf, Zr, W, Mo, Y and B have been found to be good candidates for a long-term application in turbines. After an optimized heat treatment they are characterized mainly by a two phase microstructure consisting of cuboid precipitates of ordered crystal structure and a matrix of disordered structure. Additionally, a third phase has been detected. Depending on the trace element it has different shapes, i.e. needles or ellipsoids, and influences the mechanical properties massively.Tensile tests at room temperature and around 600-800°C show excellent mechanical properties, comparable to commercial Ni-based superalloy such as Inconel 617 or Fe-Ni based alloys like Alloy 800. The best trace element concerning mechanical properties has been found to be Hf. The alloy with Hf shall now be optimized further, e.g. by adding small amounts of interesting trace elements W and/or Zr which excel in the domains of microstructure and oxidation.

“成分复杂合金/高熵合金”Al 10 Co 25 Cr 8 Fe 15 Ni 36 Ti 6及其含有微量元素Hf、Zr、W、Mo、Y和B的变体已被发现是涡轮机中长期应用的良好候选者。经过优化的热处理后，它们的特征主要在于由有序晶体结构的立方沉淀物和无序结构的基体组成的两相显微组织。此外，还发现了第三个阶段。在室温和600-800°C的拉伸试验中，合金表现出优异的力学性能，可与商用镍基高温合金（如Inconel 617）或铁镍基合金（如Alloy 800）相媲美。Hf是影响合金力学性能的最佳微量元素。含Hf的合金现在应进一步优化，例如通过添加少量感兴趣的微量元素W和/或Zr，其在微观结构和氧化领域中表现优异。