Isothermal oxidation behavior and microstructure evolution of heat-treated TiAl alloys

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-06-01 Epub Date: 2025-03-07 DOI:10.1016/j.intermet.2025.108732

Qiang Wang , Hui Du , Wei Xu , Le Gu , Hongsheng Ding , Ruirun Chen , Jingjie Guo

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Abstract

In this work, Ti-44Al-5Nb-1Cr-0.3C alloy was heat treated by two processes (labeled as WQ and FC samples, respectively), and the isothermal oxidation behavior and oxide layer evolution of the heat-treated samples at 800 °C were studied in detail. Experimental results revealed that compared with FC sample, the rapid cooling of the WQ sample refined the inter-lamellar spacing and caused destruction to local lamellae. With the increase of oxidation duration, the oxidation kinetics of both samples changed from linear to parabolic law. The short-term oxidation resistance of WQ sample was better, while the FC sample showed more advantages in resisting long-term oxidation. The extension of oxidation time not only increased the size of oxide particles and the thickness of oxide scale, but also promoted the transformation of the mono-layer oxide scale composed of Al₂O₃ and TiO₂ to a multi-layer structure. Moreover, the specific component of the multi-layer oxide varied with oxidation duration. The dissolution and re-precipitation of Al₂O₃ and diffusion of various atoms along lamellar interfaces and cracks in the interlayer were responsible for differences in the specific component of the multi-layer structure of WQ and FC samples.

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热处理TiAl合金的等温氧化行为及组织演变

本文对Ti-44Al-5Nb-1Cr-0.3C合金进行了两种热处理工艺（分别标记为WQ和FC试样），详细研究了热处理试样在800℃时的等温氧化行为和氧化层演化。实验结果表明，与FC样品相比，WQ样品的快速冷却细化了片层间距，并造成了局部片层的破坏。随着氧化时间的延长，两种样品的氧化动力学均由线性规律变为抛物线规律。WQ样品的短期抗氧化性能较好，而FC样品在长期抗氧化性能上更有优势。氧化时间的延长不仅增加了氧化颗粒的尺寸和氧化皮的厚度，而且促进了由Al2O3和TiO2组成的单层氧化皮向多层结构的转变。此外，多层氧化物的特定组分随氧化时间而变化。Al2O3的溶解和再沉淀以及各种原子沿层间界面和裂纹的扩散是WQ和FC样品多层结构具体成分差异的主要原因。

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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.