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Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

机译：量化氧气对近α钛合金微力学性能的影响

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摘要

Titanium alloys are widely used in the aerospace industry, yet oxygen ingress can severely degrade the mechanical properties of titanium alloy components. Atom probe tomography (APT), electron probe microanalysis (EPMA) and nanoindentation were used to characterise the oxygen-rich layer on an in-service jet engine compressor disc, manufactured from the titanium alloy TIMETAL 834. Oxygen ingress was quantified and related to changes in mechanical properties through nanoindentation studies.The relationship between oxygen concentration, microstructure, crystal orientation and hardness has been explored through correlative hardness mapping, EPMA and electron backscatter diffraction (EBSD). It has been found that the hardening effects of microstructure and crystallography are only significant at very low-oxygen concentrations, whereas interstitial solid solution hardening dominates by order of magnitude for higher oxygen concentrations. The role of microstructure on oxygen ingress has been studied and oxygen ingress along a potential α/β interface was directly observed on the nanoscale using APT.
机译：钛合金广泛应用于航空航天工业，但氧气进入可能会严重降低钛合金组分的机械性能。原子探测断层扫描（APT），电子探针微扫描（EPMA）和纳米indentation用于表征富含服务喷射发动机压缩机盘上的富氧层，由钛合金234制造的。量化氧气进入并与变化有关通过纳米肾上腺化研究在机械性能中。通过相关性硬度映射，EPMA和电子反向散射（EBSD）探讨了氧浓度，微观结构，晶体取向和硬度的关系。已经发现，微观结构和结晶学的硬化效应在非常低氧浓度下仅显着，而间质固溶溶液硬化占较高氧浓度的级别的级。已经研究了微观结构对氧气进入的作用，并在纳米级上直接观察到潜在α/β界面的氧气进入。

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  • 来源
    《Journal of Materials Research》 |2021年第12期|2529-2544|共16页
  • 作者

    H. M. Gardner; P. Gopon; C. M. Magazzeni; A. Radecka; K. Fox; D. Rugg; J. Wade; D. E. J. Armstrong; M. P. Moody; P. A. J. Bagot;

  • 作者单位

    Department of Materials University of Oxford Oxford 0X1 3PH UK;

    Department of Earth Sciences University of Oxford Oxford 0X1 3AN UK;

    Department of Materials University of Oxford Oxford 0X1 3PH UK;

    Rolls-Royce Plc Derby DE24 8BJ UK;

    Rolls-Royce Plc Derby DE24 8BJ UK;

    Rolls-Royce Plc Derby DE24 8BJ UK;

    Department of Earth Sciences University of Oxford Oxford 0X1 3AN UK;

    Department of Materials University of Oxford Oxford 0X1 3PH UK;

    Department of Materials University of Oxford Oxford 0X1 3PH UK;

    Department of Materials University of Oxford Oxford 0X1 3PH UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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