Phase constituent of an as-cast Co–Ni–Al–W–Re–Ti alloy: correlation of DTA results with CALPHAD and map structure simulations

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
A. Tomaszewska, G. Moskal, M. Homa, M. Kierat, M. Liśkiewicz, T. Mikuszewski, B. Witala, A. Szczotok, P. Kolakowski, T. Maciąg
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Abstract

Designing the chemical composition of new heat-resistant materials, including a new group of cobalt-based materials strengthened with the L12 phase with the general formula Co3(Al,X), requires the introduction of numerous alloy components, stabilizing the strengthening phase into the base composition. Typically, these are elements of high melting metals, whose main role is to stabilize the interphase boundary between the matrix and L12 precipitates and, in some way, strengthen the solid solution. These elements are characterized by high bond energy. On the other hand, the high content of this type of alloy addition increases the tendency of the alloy to release undesirable topologically compact phases, which rapidly deteriorate the mechanical properties of the alloy. These phases usually form in interdendritic areas, generating the so-called melting onset temperature, which deviates significantly from the solidus value. Therefore, the ability to predict the type and number of topologically compact phases being formed allows for the skilful design of the chemical composition of the alloy and its heat treatment, ensuring full dissolution of the mentioned phases in the matrix. This topic is the area of research in this article and concerns the Co–20Ni–9Al–7W–3Re–2Ti alloy in its immediately as-cast state. The scope of the research included simulations using the CALPHAD method and prediction of the phase composition of precipitates using two-dimensional structure maps. The obtained theoretical results were verified in microstructural tests using the STEM method and correlated with the results of DTA tests.

铸态Co-Ni-Al-W-Re-Ti合金的相组成:DTA结果与CALPHAD和图结构模拟的相关性
设计新型耐热材料的化学成分,包括一组用L12相强化的钴基材料,其通式为Co3(Al,X),需要引入大量合金成分,以稳定强化相到基体成分中。通常,这些元素是高熔点金属,其主要作用是稳定基体和L12析出相之间的相界,并以某种方式强化固溶体。这些元素的特点是化学键能高。另一方面,这种类型的合金添加物的高含量增加了合金释放不良拓扑致密相的倾向,这迅速恶化了合金的力学性能。这些相通常在枝晶间区域形成,产生所谓的熔化起始温度,该温度明显偏离固相值。因此,预测正在形成的拓扑致密相的类型和数量的能力允许巧妙地设计合金的化学成分及其热处理,确保上述相在基体中完全溶解。本课题是本文的研究领域,涉及Co-20Ni-9Al-7W-3Re-2Ti合金在立即铸态的研究。研究范围包括使用CALPHAD方法进行模拟和使用二维结构图预测析出相的相组成。利用STEM方法对所得理论结果进行了微观结构试验验证,并与DTA试验结果进行了相关性分析。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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