Precision control of oxygen content in CP-Ti for ultra-high strength through titanium oxide decomposition: An in-situ study

IF 8.4

MATERIALS & DESIGN Pub Date : 2023-03-01 DOI:10.1016/j.matdes.2023.111797

Xianzhe Shi, Xiuxia Wang, Biao Chen, Junko Umeda, Abdollah Bahador, Katsuyoshi Kondoh, Jianghua Shen

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引用次数: 1

Abstract

Oxygen has been known as an effective strengthening element in titanium (Ti) and its alloys. However, an over-dose of oxygen can also lead to embrittlement of Ti alloys. To precisely control and push the limit of oxygen in Ti and its alloys, we studied the decomposition process of Ti oxides in pure α-Ti matrix using an in-situ high-temperature scanning electron microscope. The experimental results revealed that TiO particles decomposed in α-Ti at elevated temperatures and the oxygen atoms gradually diffused into the matrix, following the Fick’s second law. Then, the samples with different oxygen contents were produced using the aforementioned strategy, for which the oxygen content, microstructure, and mechanical properties were measured. The results revealed that the oxygen content can be precisely controlled, which can achieve an ultra-high tensile strength of close to 1100 MPa, at no expense of elongation-to-failure, with incorporating 0.87 wt% oxygen. An analysis showed that the strength contribution from oxygen follows the Labusch law. These findings offer a novel approach to design high-performance Ti alloys with non-toxic and cheap elements.

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利用氧化钛分解技术精确控制CP-Ti超高强度含氧量的研究

氧在钛及其合金中是一种有效的强化元素。然而，过量的氧气也会导致钛合金的脆化。为了精确控制和突破Ti及其合金中氧的极限，利用原位高温扫描电镜研究了纯α-Ti基体中Ti氧化物的分解过程。实验结果表明，tio2颗粒在高温下分解成α-Ti，氧原子逐渐扩散到基体中，符合菲克第二定律。然后，采用上述方法制备不同氧含量的样品，测量氧含量、微观结构和力学性能。结果表明，氧含量可以精确控制，在不牺牲延伸至失效的情况下，可以达到接近1100mpa的超高拉伸强度，含氧量为0.87 wt%。分析表明，氧的强度贡献符合Labusch定律。这些发现为设计具有无毒和廉价元素的高性能钛合金提供了一种新方法。

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MATERIALS & DESIGN

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期刊介绍： Materials and Design is a multidisciplinary journal that publishes original research reports, review articles, and express communications. It covers a wide range of topics including the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, as well as the design of materials and engineering systems, and their applications in technology. The journal aims to integrate various disciplines such as materials science, engineering, physics, and chemistry. By exploring themes from materials to design, it seeks to uncover connections between natural and artificial materials, and between experimental findings and theoretical models. Manuscripts submitted to Materials and Design are expected to offer elements of discovery and surprise, contributing to new insights into the architecture and function of matter.