Unveiling the effects of oxidation on the microstructure and microchemistry of the oxygen-rich layer in a near-α Ti alloy

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-21 DOI:10.1016/j.corsci.2025.113344

Yanhong Chang , Junyang He , Feilong Yang , Wenjun Lu , Yawen Zhao , Ruiwen Li , Bin Su , Anyi Yin

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Abstract

A combination of electro-probe microanalysis, transmission electron microscopy and atom probe tomography was employed to investigate the effects of high-temperature oxidation on the gradient of the microstructure and microchemistry of the oxygen-rich layer on a near-α Ti alloy, Ti6242s, with a bimodal microstructure. α₂ precipitation occurred within the oxygen-rich layer, more pronounced inside the primary α grains than within the secondary α laths. The degree of α₂ precipitation increases with increasing oxygen content, and the critical amount of oxygen triggering α₂ is ∼3 at. % in the primary α grains, and even higher within the secondary α laths. These values are far greater than the reported value, ∼0.6–0.75 at. %, for the bulk alloy. Heterogeneous Al segregation was observed within the secondary α laths while bcc-β phase persisted even at the very surface where the oxygen content was highest. These findings indicate that oxygen ingress accelerates precipitation of α₂ at elevated temperature, and faster O diffusion along the dislocations and boundaries stimulates heterogeneous Al segregation. The lower degree of ordering within the secondary α laths was probably owing to the lower Si content and Al supersaturation.

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揭示了氧化对近α钛合金富氧层微观组织和微观化学的影响

采用电探针显微分析、透射电镜和原子探针断层扫描相结合的方法，研究了高温氧化对双峰型近α钛合金Ti6242s显微组织梯度和富氧层微观化学的影响。α2析出主要发生在富氧层内，在初生α晶粒内比在次生α板条内更为明显。α2的析出程度随氧含量的增加而增加，α2的临界氧触发量为~ 3 at。%，在次生α条中更高。这些值远远大于报告值，约0.6-0.75 at。%，用于散装合金。在次级α板条内观察到非均相Al偏析，而bcc-β相即使在氧含量最高的表面也存在。结果表明，氧的加入加速了α2在高温下的析出，O沿位错和边界的快速扩散促进了Al的非均相偏析。次级α条内的有序程度较低可能是由于Si含量较低和Al过饱和所致。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.