Effects of alloying elements on the microstructure and mechanical properties of laser powder deposited Ti-27Nb-5Zr-based metastable β-Ti alloys

IF 4.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI:10.1016/j.vacuum.2026.115136

Zelin Jiang , Jiaxuan Wang , Jinxiang Fang , Haotian He , Haojie Jin , Yuebing Li , Tong Sun , Yongxiong Chen

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Abstract

Four metastable β-Ti alloys, with nominal compositions of Ti-27Nb-5Zr-5Cr, Ti-27Nb-5Zr-2Cr, Ti-27Nb-5Zr-5Cr-2Fe, and Ti-27Nb-5Zr-3.5Mo (wt.%), were fabricated via intermittent laser powder deposition (ILD). The influence of Cr, Fe, and Mo on the microstructure and mechanical properties was systematically investigated. The results showed that all four alloys exhibited excellent strength-ductility synergy, with Ti-27Nb-5Zr-5Cr having the best strength-ductility product (17.2 ± 0.2 GPa·%). When the Cr content was reduced, both solid-solution strengthening and β phase stability were weakened, ω phase precipitation was promoted, and twinning-induced plasticity (TWIP) was enhanced. Although the elongation (EL) remained unchanged, the yield strength (YS) and ultimate tensile strength (UTS) decreased to 592 ± 26 MPa and 685 ± 18 MPa, respectively, corresponding to only 87% and 90% of those of Ti-27Nb-5Zr-5Cr, and the strength-ductility product decreased by 17%. The addition of 2 wt% Fe further enhanced β phase stability and solid-solution strengthening, increasing YS and UTS to 690 ± 11 MPa and 799 ± 4 MPa. Notably, the β phase in Ti-27Nb-5Zr-3.5Mo was more stable, and this alloy achieved the highest YS and UTS (710 ± 10 MPa and 814 ± 32 MPa), but the lowest EL and strength-ductility product (15 ± 3% and 11.9 ± 2.4 GPa·%).

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合金元素对激光粉末沉积ti - 27nb - 5zr基亚稳β-Ti合金组织和力学性能的影响

采用间歇激光粉末沉积（ILD）法制备了4种标称成分分别为Ti-27Nb-5Zr-5Cr、Ti-27Nb-5Zr-2Cr、ti - 27nb - 5zr - 2fe和Ti-27Nb-5Zr-3.5Mo的亚稳β-Ti合金。系统研究了Cr、Fe、Mo对合金组织和力学性能的影响。结果表明：4种合金均表现出良好的强度-塑性协同效应，其中Ti-27Nb-5Zr-5Cr合金的强度-塑性产物最佳（17.2±0.2 GPa·%）；当Cr含量降低时，固溶强化和β相稳定性减弱，ω相析出促进，孪晶诱导塑性（TWIP）增强。在伸长率不变的情况下，屈服强度和极限抗拉强度分别降至592±26 MPa和685±18 MPa，分别为Ti-27Nb-5Zr-5Cr的87%和90%，强度延性比下降17%。2 wt% Fe的加入进一步增强了β相稳定性和固溶强化，YS和UTS分别提高到690±11 MPa和799±4 MPa。值得注意的是，Ti-27Nb-5Zr-3.5Mo中的β相更加稳定，该合金获得了最高的YS和UTS(710±10 MPa和814±32 MPa)，但最低的EL和强度-塑性产物（15±3%和11.9±2.4 GPa·%）。

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

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.