Silicon-Modified Ti-Based Refractory High Entropy Alloys for Enhanced Strength and Reduced Density

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-07-29 DOI:10.1016/j.jallcom.2025.182548

Poonam Diwan, Abhinandan Kumar Thakur, Priyam Kashyap Sarmah, Santosh Kumar Tamang, R Jose Immanuel, Anil Kumar, Ankur Jaiswal

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Abstract

This study examines the effect of silicon (Si) addition on the microstructure, mechanical properties, and corrosion behavior of Ti₄Al₁.₅Cr₁.₅V₁.₅Nb₁.₅Si_x (x = 0–0.75 atomic ratio) refractory high-entropy alloys (RHEAs) synthesized via vacuum arc melting. The base alloy exhibited a single-phase BCC structure, while Si addition promoted the formation of hard M₅Si₃ silicide. At 0.25 Si, the alloy achieved superior mechanical performance, with enhanced strength and ductility resulting from solid solution strengthening, grain refinement, and fine silicide dispersion. However, higher Si contents (0.50 and 0.75) led to increased brittleness due to coarse silicide growth and elemental segregation. Corrosion resistance improved initially due to stable passive film formation but deteriorated at higher Si levels owing to micro-galvanic effects and structural inhomogeneity. These results highlight that optimized Si incorporation (x = 0.25) offers a strategic pathway to develop lightweight, high-strength RHEAs with balanced mechanical integrity and corrosion resistance for extreme service environments.

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增强强度和降低密度的硅改性ti基难熔高熵合金

本研究考察了硅（Si）添加对Ti₄Al₁.₅Cr₁.₅V₁.₅Nb₁的微观结构、机械性能和腐蚀行为的影响。₅六（x = 0-0.75原子比）耐火高熵合金（RHEAs）通过真空电弧熔化合成。基合金表现出单相BCC结构，而Si的加入促进了硬质M₅Si₃硅化物的形成。在硅含量为0.25时，合金的力学性能优异，由于固溶体强化、晶粒细化和硅化物的精细分散，合金的强度和延展性都得到了提高。然而，较高的Si含量（0.50和0.75）导致脆性增加，这是由于粗硅化物生长和元素偏析。由于钝化膜形成稳定，耐蚀性最初有所提高，但由于微电效应和结构不均匀性，在硅含量较高时，耐蚀性下降。这些结果表明，优化的Si掺入量（x = 0.25）为开发具有平衡机械完整性和耐腐蚀性的轻质高强度rhea提供了一条战略途径。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.