Superlattice phase precipitation in Ti-Fe-Mo-Al alloys

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-02 DOI:10.1016/j.matchar.2026.116139

A.M.L. Andersson, R.F.L. Mellor, J.M. Hogg, H.C. Cole, G.I. Lampronti, N.L. Church, O.S. Houghton, N.G. Jones, H.J. Stone

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引用次数: 0

Abstract

Ti-Fe-Al and Ti-Fe-Mo alloys containing B2 superlattice precipitates within an A2 matrix have attracted interest for structural applications. However, few studies have considered alloys derived from the quaternary Ti-Fe-Mo-Al system. In this work, six Ti-Fe-Mo-Al compositions with 70 at.% Ti have been aged for 1000 h at

600

800

, and 1000 °C to assess their equilibrium phases. A2+B2 phase microstructures formed in two of the alloys considered: Ti-20Fe-5Mo-5Al at both

800

and 1000 °C, and Ti-15Fe-10Mo-5Al at 800 °C. A2+B2 microstructures were not observed in the other alloys investigated. At high temperatures, most alloys were single-phase A2, while at lower temperatures A3 and D0₁₉ phases were widely observed.

Studying continuous cooling of Ti-20Fe-5Mo-5Al from the solid solution showed a change in precipitation behaviour with cooling rate. Intermediate cooling rates permitted discontinuous B2 precipitation. The slowest cooling rate led to continuous B2 precipitation and the observation of the D8

_{a}

G-phase. This transition in precipitation mechanism was attributed to the relative rates of bulk and grain boundary diffusion at varying temperatures.

Abstract Image

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Ti-Fe-Mo-Al合金的超晶格相析出

在A2基体中含有B2超晶格沉淀的Ti-Fe-Al和Ti-Fe-Mo合金引起了人们对结构应用的兴趣。然而，很少有研究考虑从季系Ti-Fe-Mo-Al衍生的合金。在这项工作中，六种Ti-Fe-Mo-Al组合物具有70 at。% Ti分别在600、800和1000℃下时效1000 h，以评估其平衡相。在800°C和1000°C时，Ti-20Fe-5Mo-5Al和800°C时，Ti-15Fe-10Mo-5Al合金中形成了A2+B2相组织。在其他合金中未观察到A2+B2组织。在高温下，大多数合金为单相A2，而在较低温度下，广泛观察到A3和D019相。对Ti-20Fe-5Mo-5Al固溶体的连续冷却研究表明，随着冷却速率的变化，析出行为发生了变化。中等冷却速率允许不连续的B2析出。最慢冷却速率导致B2连续析出，并观察到D8a g相。这种转变机制归因于不同温度下体扩散和晶界扩散的相对速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.