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首页> 外文期刊>Metallurgical and materials transactions. A, physical metallurgy and materials science >A High-Resolution Transmission Electron Microscopy Study of Interfaces between the γ, B2, and α_2 Phases in a Ti-Al-Mo Alloy
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A High-Resolution Transmission Electron Microscopy Study of Interfaces between the γ, B2, and α_2 Phases in a Ti-Al-Mo Alloy

机译：Ti-Al-Mo合金中γ，B2和α_2相之间的界面的高分辨率透射电镜研究

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摘要

Conventional and high-resolution transmission electron microscopy (HRTEM) were used to examine the interfacial structures in a Ti-50Al-5Mo (at. pct) alloy which was processed to produce combinations of γ, B2, and α_2 phases in a single sample. A small amount of a fourth phase labeled ζ was also found in the microstructure. It may be the phase Ti_2AlN but confirmation requires analysis of the N content in the phase. In this alloy, the orientation relationship between the γ and B2 phases is {111}_γ || {110}_(B2) and < 101 ]_γ || < 111 > _(B2) with a coherent habit-plane interface parallel to {474)_γ. The orientation relationship between the B2 and α_2 (and also the ζ) phases is {110}_(B2) || (0001)_(α2/ζ) and < 111 > _(B2) || < 1120 > _(α2/ζ) with a coherent interface parallel to the close-packed planes and along other orientations. The orientation relationship between the α_2 (and also the ζ) and γ phases is (0001)_(α2/ζ) || {111}_γ and < 1120 > _(α2/ζ) || < 101 ]_?. The α_2 phase has a coherent interface parallel to the close-packed planes, while the ζ phase appears to adopt the {474)_γ interface plane of the γ phase, similar to the B2 phase. In some cases, the interface configuration between the γ and B2 phases appears to be altered by the presence of α_2 phase, resulting in a semicoherent interface. The phase labeled ζ in this study has the same orientation relationship with the γ and B2 phases as α_2 but consists of an ABABAC... stacking of close-packed basal planes. The {474)_γ habit plane interface between the γ and B2 phases is analyzed by several different theories of interfacial structure, and microstructural evolution in this system is also discussed.
机译：传统的高分辨率透射电子显微镜（HRTEM）用于检查Ti-50Al-5Mo（at。pct）合金中的界面结构，该合金经过处理可在单个样品中产生γ，B2和α_2相的组合。在微结构中还发现了少量的标记为ζ的第四相。可能是Ti_2AlN相，但要确认需要分析该相中的N含量。在该合金中，γ和B2相之间的取向关系为{111}_γ||。 {110} _（B2）和<101]_γ|| <111> _（B2），其相干的习惯平面界面与{474）_γ平行。 B2和α_2（以及ζ）相之间的取向关系为{110} _（B2）||。 （0001）_（α2/ζ）和<111> _（B2）|| <1120> _（α2/ζ），其相干界面平行于密排平面并沿其他方向。 α_2（以及ζ）和γ相之间的取向关系为（0001）_（α2/ζ）||。 {111}_γ和<1120> _（α2/ζ）|| <101]_?。 α_2相具有平行于密堆积平面的相干界面，而ζ相似乎采用γ相的{474）_γ界面平面，类似于B2相。在某些情况下，γ相和B2相之间的界面结构似乎会由于存在α_2相而发生变化，从而导致半相干界面。在这项研究中标记为ζ的相与γ和B2相具有与α_2相同的取向关系，但由ABABAC ...紧密堆积的基面堆叠组成。通过几种不同的界面结构理论分析了γ和B2相之间的（474）_γ惯性平面界面，并讨论了该系统的微观结构演化。

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