新型α+β双相钛合金时效过程中多个亚稳相的共同演化及其对强化的独特贡献

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-10-01 DOI:10.1016/j.scriptamat.2025.117022

Fei-Fei Du , Chun-Guang Bai , Diao-Feng Li , Zhi-Qiang Zhang , Jing-Ping Cui , Ran Wang , Dong-Sheng Xu , Rui Yang

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引用次数: 0

摘要

研究了新型α+β双相钛合金在400℃时效过程中α″、ωath和βm等亚稳相的共同演化行为。β相的详细时间变换顺序为ωath+α″+βr→α″+ωiso→ωiso+αs→αs。老化动力学可分为3个有代表性的阶段：（ⅰ）初始阶段ω ω快速分解（t <0.25 h），（ⅱ）ω ωiso持续α″→αs转变和析出/长大（0.25 h<t<4 h），（ⅲ）ω ωiso辅助αs成核和αs粗化（4 h<t<12 h）。建立了亚稳相转变、相尺寸、体积分数与拉伸性能之间的明确关系，实现了抗拉强度在1200 ~ 1700 MPa范围内的大规模可调。本研究不仅为双相钛合金中多个共存亚稳相的转变提供了新的认识，而且为亚稳相强化钛合金的策略设计提供了有价值的指导。

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Co-evolution of multiple metastable phases during ageing and their unique contributions to strengthening in a novel α+β dual-phase titanium alloy

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Co-evolution of multiple metastable phases during ageing and their unique contributions to strengthening in a novel α+β dual-phase titanium alloy

This study investigates the co-evolution behavior of multiple metastable phases, including α″, ω_ath, and β_m in a novel α+β dual-phase Ti alloy during ageing at 400 °C. The detailed temporal transformation sequence of the β phase is ω_ath+α″+β_r→α″+ω_iso→ω_iso+α_s→α_s. The ageing kinetics can be categorized into three representative stages: (ⅰ) rapid ω_ath decomposition in the initial stage (t <0.25 h), (ⅱ) sustained α″→α_s transformation and precipitation/growth of ω_iso(0.25 h<t<4 h), and (ⅲ) ω_iso assisted α_s nucleation and α_s coarsening (4 h<t<12 h). A clear relationship among metastable phases transformation, phase size, volume fraction and tensile properties was established, enabling the large-scale tunability of tensile strength from 1200 MPa to 1700 MPa. This work not only provides new insights into the transformation of multiple coexisting metastable phases in dual-phase titanium alloys, but also provides valuable guidance for the strategic design of metastable phases to strengthen titanium alloys.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.