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首页> 外文期刊>Materials Science and Engineering >Internal friction and atomic relaxation processes in an intermetallic Mo-rich Ti-44Al-7Mo (γ + β_o) model alloy
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Internal friction and atomic relaxation processes in an intermetallic Mo-rich Ti-44Al-7Mo (γ + β_o) model alloy

机译：金属间富Mo的Ti-44Al-7Mo（γ+β_o）模型合金的内摩擦和原子弛豫过程

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摘要

The design of the next generation of β-stabilized γ-TiAl based alloys as structural materials for high-temperature applications in aircraft engines requires the precise knowledge of the mobility of defects in the ordered β_o phase. To reach this goal a Mo-rich prototype alloy has been specifically produced and investigated. The mobility of defects, between 600 K and 1635 K, has been studied by mechanical spectroscopy. The internal friction spectra show a relaxation peak P1 (at 1130 K for 1 Hz) superimposed to a high-temperature background. We demonstrate that the relaxation peak is taking place inside the β_o phase and measure an activation energy of E_(P1) = 3.55 ± 0.05 eV. An atomistic model is additionally proposed to explain this relaxation peak, which is attributed to a Zener-like mechanism of stress-induced Mo-Mo dipoles reorientation by exchange with a vacancy, and consequently the measured activation energy corresponds to the one for Mo diffusion in the β_o phase.
机译：下一代β稳定的γ-TiAl基合金作为飞机发动机高温应用的结构材料的设计，需要对有序β_o相中缺陷迁移率的精确了解。为了达到这个目标，专门生产和研究了富钼的原型合金。缺陷的迁移率在600 K和1635 K之间，已通过机械光谱法进行了研究。内部摩擦谱显示出松弛峰P1（在1130 K，1 Hz）叠加在高温背景上。我们证明了弛豫峰发生在β_o相内部，并测量了E_（P1）= 3.55±0.05 eV的活化能。另外提出了一个原子模型来解释该弛豫峰，这归因于通过与空位交换而引起应力诱导的Mo-Mo偶极子重新定向的齐纳式机制，因此测得的活化能对应于Mo扩散的活化能。 β_o相。

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  • 来源
    《Materials Science and Engineering》 |2017年第17期|495-502|共8页
  • 作者

    L. Usategui; M.L. No; S. Mayer; H. Clemens; J. San Juan;

  • 作者单位

    Dpt. Fisica Materia Condensada, Facultad de Ciencia y Tecnologia, Univ. del Pais Vasco, Aptdo. 644, 48080 Bilbao, Spain;

    Dpt. Fisica Aplicada II, Facultad de Ciencia y Tecnologla, Univ. del Pais Vasco, Aptdo. 644, 48080 Bilbao, Spain;

    Dpt. Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, 8700 Leoben, Austria;

    Dpt. Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, 8700 Leoben, Austria;

    Dpt. Fisica Materia Condensada, Facultad de Ciencia y Tecnologia, Univ. del Pais Vasco, Aptdo. 644, 48080 Bilbao, Spain;

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  • 正文语种 eng
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  • 关键词

    Intermetallics; Ti-Al; Diffusion; Internal friction; Creep; Point defects;

    机译：金属间化合物钛铝;扩散;内部摩擦;蠕变;点缺陷;

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