Microstructure regulation and mechanical properties of a newly developed ultra-high strength Ti-542 alloy

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2025-01-03 DOI:10.1007/s10853-024-10534-6

Hengpei Pan, Jinguang Li, Xiao Yang, Qianqian Chen, Keren Zhang, Mi Zhou, Shengqi Feng

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Abstract

A novel ultra-high strength Ti-5Mo-5Cr-4Al-4V-2Nb (Ti-542) alloy after quasi-β forging was treated by solid solution-aging (STA) process. The microstructure characteristics under different STA regimes were studied. Through deformation twin inheritance and substructure recrystallization, grain refinement of α_p can be achieved. The secondary phase precipitation behaviors in grain and at grain boundary were also analyzed in detail. It is found that α_GW consistently aligns with the \(\langle {11\overline{2}0} \rangle\) axis of α_G, and the growth of α_GW can be divided into three categories according to the orientation of adjacent β grains. Moreover, the excellent strength-plasticity matching of Ti-542 alloy, with the yield strength of 1345 MPa and the maximum strain exceeding 8% has been achieved. The fracture mechanisms with different microstructure characteristics were analyzed. The contributions of strengthening mechanisms, including fine grain strengthening, dislocation strengthening and precipitate strengthening, were systematically calculated based on strengthening models. The results will provide theoretical basis and process guidance for the microstructure design and mechanical property regulation of the new metastable β titanium alloy.

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新研制的超高强度Ti-542合金的组织调控与力学性能

采用固溶时效（STA）工艺对准β锻造后的新型超高强度Ti-5Mo-5Cr-4Al-4V-2Nb （Ti-542）合金进行了热处理。研究了不同热处理条件下的显微组织特征。通过变形孪晶继承和亚结构再结晶，实现αp的晶粒细化。详细分析了晶粒内和晶界处的二次相析出行为。结果表明，αGW与αG的\(\langle {11\overline{2}0} \rangle\)轴一致，αGW的生长根据邻近β晶粒的取向可分为三类。此外，Ti-542合金的屈服强度达到1345 MPa，最大应变超过8，具有良好的强度塑性匹配% has been achieved. The fracture mechanisms with different microstructure characteristics were analyzed. The contributions of strengthening mechanisms, including fine grain strengthening, dislocation strengthening and precipitate strengthening, were systematically calculated based on strengthening models. The results will provide theoretical basis and process guidance for the microstructure design and mechanical property regulation of the new metastable β titanium alloy.

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.