Microstructure and tensile performance of Ti-1Al-8V-5Fe alloy produced by laser powder bed fusion versus directed energy deposition

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2025-04-01 Epub Date: 2025-02-06 DOI:10.1016/j.vacuum.2025.114114

Chun Shang , Jiangpeng Zheng , Xiaodong Hou , Keyu Jin , Mingqiang Chu , Shuyan Zhang

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Abstract

This study investigates microstructure and tensile performance of Ti-1Al-8V-5Fe (Ti-185), a high-strength and cost-effective β-titanium (β-Ti) alloy, fabricated using two techniques: laser powder bed fusion (LPBF) and laser directed energy deposition (LDED). The results demonstrate superior capability of LPBF in producing Ti-185 with a refined microstructure, due to ultra-high cooling rates (∼10⁶ K/s). This process inhibits the formation of brittle ω phase, achieving an impressive tensile strength of approximately 1100 MPa and ductility around 9 %. Conversely, LDED's lower cooling rates (∼10² K/s) result in coarser grains and significant ω phase precipitation, leading to reduced ductility and brittle fracture behavior. This work provides a systematic comparison of LPBF and LDED Ti-185, addressing key challenges such as Fe micro-segregation and brittle phase formation. These findings highlight LPBF's potential for optimizing the balance of strength and ductility in Ti-185 alloy, offering valuable insights into processing strategies for advanced β-Ti alloys in industrial applications.

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激光粉末床熔合与定向能沉积制备Ti-1Al-8V-5Fe合金的组织与拉伸性能

采用激光粉末床熔合（LPBF）和激光定向能沉积（LDED）两种工艺制备了高强度、高性价比的β-钛（β-Ti）合金Ti-1Al-8V-5Fe （Ti-185）的显微组织和拉伸性能。结果表明，由于超高的冷却速率（~ 10 26 K/s）， LPBF在制备Ti-185方面具有优异的性能，并具有精致的微观结构。这一过程抑制了脆性ω相的形成，获得了令人印象深刻的抗拉强度约为1100mpa，延展性约为9%。相反，低冷却速率（~ 102 K/s）会导致更粗的晶粒和显著的ω相析出，从而导致延展性降低和脆性断裂行为。这项工作提供了LPBF和LDED Ti-185的系统比较，解决了Fe微偏析和脆性相形成等关键挑战。这些发现突出了LPBF在优化Ti-185合金强度和延展性平衡方面的潜力，为工业应用中先进β-Ti合金的加工策略提供了有价值的见解。

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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.