Additive manufacturing of Ti/Zr/Mo/Al lightweight refractory complex concentrated Alloy: Integrated computational material engineering approach

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-21 DOI:10.1016/j.intermet.2025.108835

Madhavan Radhakrishnan , Jitesh Kumar , KN Chaithanya Kumar , Sudip Kumar Sarkar , Krishna Kamlesh Verma , Selvamurugan Palaniappan , Saikumar Dussa , Shashank Sharma , Narendra B. Dahotre

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引用次数: 0

Abstract

Refractory complex concentrated alloys (RCCAs) comprising refractory metals, are potential candidates for high-temperature applications. The compositional screening of a suitable alloy is very challenging due to the vast compositional space of complex concentrated alloys (CCAs). To address this issue, an integrated computational materials engineering (ICME) framework consisting of detailed CALPHAD (CALculation of PHase Diagram) modeling was adopted to design non-equiatomic Ti/Zr/Mo/Al CCAs. The one-axis equilibrium diagram reveals that Ti₄₀Zr₄₀Mo₁₀Al₁₀ (at. %) exhibits predominantly a single-phase BCC structure over the wide temperature range (860–1660 °C). The alloy was fabricated using laser based directed energy deposition technique. The detailed characterization of as-printed samples revealed the formation of equiaxed grains along build direction with single phase BCC microstructure. Due to the high fraction of porosities, the as-printed alloy was subjected to hot isostatic pressing treatment that resulted in near complete densification of the printed alloy and led to the precipitation of A₃B type precipitates and B2 nano clusters as evidenced by TEM and APT techniques. Finite element (FE) based multilayer and multitrack thermokinetic model approach was considered to seek an insight into the grain morphology evolution during additive manufacturing of these alloys.

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Ti/Zr/Mo/Al轻质难熔复合浓缩合金的增材制造：综合计算材料工程方法

含有难熔金属的难熔复合浓缩合金（RCCAs）是高温应用的潜在候选者。由于复杂浓缩合金（CCAs）的成分空间很大，因此筛选合适的合金是非常具有挑战性的。为了解决这一问题，采用由详细的CALPHAD（计算相图）建模组成的集成计算材料工程（ICME）框架来设计非等原子Ti/Zr/Mo/Al CCAs。单轴平衡图显示Ti40Zr40Mo10Al10 (at。%)在宽温度范围（860-1660°C）内主要表现为单相BCC结构。采用激光定向能沉积技术制备了该合金。打印样品的详细表征表明，沿构建方向形成等轴晶粒，具有单相BCC微观结构。由于孔隙率高，对打印合金进行热等静压处理，导致打印合金接近完全致密化，并导致A3B型析出相和B2纳米团簇，TEM和APT技术证实了这一点。采用基于有限元的多层多径热动力学模型方法，对增材制造过程中晶粒形貌的演变进行了深入研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.