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Strengthening of cast Ti-25Nb-3Mo-3Zr-2Sn alloy through precipitation of a in two discrete crystallographic orientations

机译:通过在两个离散晶体学方向上析出a来强化铸造Ti-25Nb-3Mo-3Zr-2Sn合金

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摘要

A detailed study of the microstructural development during aging of a Ti-25Nb-3Mo-3Zr-2Sn alloy is presented. Transmission electron microscopy observations show the as-cast microstructure is comprised of large β grains containing fine coherent ω precipitates. Fine scale a laths form in two different crystallographic orientations throughout the β matrix when the alloy is aged directly from the as-cast condition. The a laths typically have habit planes close to {11l}_β or {233}_β. Aging at 450 ℃ doubles the yield strength as compared to that in the as-cast condition. We suggest that the differently orientated α laths may contribute to this significant increase in the strength of the alloy. Martensitic α" phase, with its habit plane close to {433}_β, was observed in the as-cast microstructure subsequent to deformation.
机译:本文详细介绍了Ti-25Nb-3Mo-3Zr-2Sn合金在时效过程中的显微组织发展。透射电子显微镜观察表明,铸态的微观结构由大的β晶粒组成,其中包含精细的相干ω析出物。当直接从铸态进行时效时,在整个β基体中,细鳞片在整个β基体中以两种不同的晶体学取向形成。板条通常具有接近{11l}_β或{233}_β的习性平面。与铸态相比,在450℃时效时的屈服强度提高了一倍。我们建议,取向不同的α板条可能有助于合金强度的显着提高。在变形后的铸态显微组织中观察到马氏体α“相,其习性平面接近{433}_β。

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  • 来源
    《Materials Science and Engineering》 |2010年第25期|p.6601-6606|共6页
  • 作者单位

    Defence Materials Technology Centre, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands;

    rnDefence Materials Technology Centre, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia;

    rnDefence Materials Technology Centre, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia CAST CRC, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia;

    rnBiomaterial Research Centre, Northwest Institute for Nonferrous Metal Research, Xian 710016, China;

    rnDefence Materials Technology Centre, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia CAST CRC, School of Engineering, The University of Queensland, Brisbane QLD 4072, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    near β titanium alloy; mechanical properties; nucleation; habit plane; casting; precipitation;

    机译:近β钛合金;机械性能成核习惯飞机铸件;沉淀;

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