Exploring the Impact of Configurational Entropy on the Design and Development of CoNi-Based Superalloys for Sustainable Applications
Exploring the Impact of Configurational Entropy on the Design and Development of CoNi-Based Superalloys for Sustainable Applications
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DOI：
10.1016/j.jallcom.2023.171380
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发表时间：
2023-07
影响因子：
6.2
通讯作者：
Ahad Mohammadzadeha;A. Heidarzadeh;Hailey Becker;Jorge Valilla Robles;A. Meza;M. Avella;M. Monclús;D. Tourret;J. M. Torralba
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文献类型：
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作者：
Ahad Mohammadzadeha;A. Heidarzadeh;Hailey Becker;Jorge Valilla Robles;A. Meza;M. Avella;M. Monclús;D. Tourret;J. M. Torralba
对最近重新发现的由 γ' 相强化的 Co 和/或 CoNi 基高温合金的综合文献综述揭示了系统的构型熵与 γ' 固溶线温度之间的关系。本研究是在具有高构型熵的高铬钴镍基高温合金系统上进行的，以检验我们基于可持续冶金框架的假设。通过热力学计算来设计化学成分，然后通过真空铸造和热处理来生产所需的合金。使用扫描电子显微镜、电子背散射衍射、透射电子显微镜和差热分析对微观结构进行表征。采用显微硬度和纳米压痕测试来测量机械性能。结果表明，构型熵和合金元素的类型决定了合金的最终高温性能。我们发现，为了提高较高的γ'固溶线温度，应通过添加γ'稳定元素来增加构型熵。详细讨论了热处理前后所设计合金的微观结构和机械特性。这项研究的结果有利于开发具有适当加工窗口和冷冻范围的钴基高熵高温合金，以实现先进的可持续制造目的，例如使用粉末床熔融技术。
A comprehensive literature review on recently rediscovered Co- and/or CoNi-based superalloys, strengthened by the γ' phase, revealed a relationship between the configurational entropy of the system and the γ' solvus temperature. This study was conducted on a high-Cr CoNi-based superalloy system with high configurational entropy to test our hypothesis based on the sustainable metallurgy framework. Thermodynamic calculations were performed to design the chemical compositions, followed by vacuum casting and heat treatments to produce the desired alloys. The microstructures were characterized using a scanning electron microscope, electron backscattered diffraction, transmission electron microscope, and differential thermal analysis. Microhardness and nanoindentation tests were employed to measure the mechanical properties. The results showed that both the configurational entropy and the type of alloying elements determine the final high-temperature performance of the alloys. We found that to enhance the higher γ' solvus temperature, the configurational entropy should be increased by adding γ' stabilizing elements. The microstructural and mechanical characteristics of the designed alloys before and after heat treatments are discussed in detail. The outcome of this study is beneficial for developing cobalt-based high-entropy superalloys with appropriate processing windows and freezing ranges foradvanced sustainable manufacturingpurposes, such as using powder bed fusion technologies.