Investigation of microstructure evolution and nanoindentation hardness of an oxygen-doped Ti35Zr35Hf20Nb10 nanograined multi-principal element alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-14 DOI:10.1016/j.intermet.2025.108826

Rong Huang , Zongde Kou , Song Tang , Shimao Lv , Gerhard Wilde , Si Lan , Tao Feng

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引用次数: 0

Abstract

In this study, an oxygen-doped nominal component of (Ti₃₅Zr₃₅Hf₂₀Nb₁₀)₉₈O₂ nanograined multi-principal element alloy (NG-MPEA) with an average grain size of about 50 nm was synthesized via inert gas condensation (IGC). Moreover, the mechanical properties and microstructural evolution of the alloys were systematically investigated. The as-prepared samples (as-IGC) are composed of two phases with body-centered cubic (bcc) and hexagonal close-packed (hcp) structures. The samples were annealed to regulate the microstructure. The results demonstrate that when annealed at temperatures below 450 °C, the dual-phase structure composed of bcc and hcp phases was maintained. However, when annealed at 650 °C, a phase transformation of bcc to nano-sized ordered ω’ were observed. The nanoindentation hardness of the NG-MPEA increases from 4.5 GPa to 6.3 GPa after annealing at 450 °C and further increases to 7.6 GPa after annealing at 650 °C. Compared with the as-IGC state, the hardness increased by 69 %. The relationship between microstructure evolution and nanoindentation hardness was further discussed. This work provides an effective approach for enhancing the hardness of bulk NG-MPEAs by adjusting their microstructure.

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氧掺杂Ti35Zr35Hf20Nb10纳米多主元素合金显微组织演变及纳米压痕硬度研究

本研究采用惰性气体冷凝法（IGC）合成了一种平均晶粒尺寸约为50 nm的（Ti35Zr35Hf20Nb10）98O2纳米多元素合金（NG-MPEA）的氧掺杂标称组分。并对合金的力学性能和显微组织演变进行了系统的研究。制备的样品（as-IGC）由体心立方（bcc）和六方密排（hcp）两种结构组成。对试样进行退火以调节其微观组织。结果表明，当温度低于450℃时，合金保持了bcc和hcp相的双相结构。然而，在650℃退火时，观察到bcc向纳米级有序ω '的相变。450℃退火后，NG-MPEA的纳米压痕硬度由4.5 GPa提高到6.3 GPa， 650℃退火后进一步提高到7.6 GPa。与as-IGC状态相比，硬度提高了69%。进一步讨论了显微组织演变与纳米压痕硬度的关系。本研究为通过调整ng - mpea的显微组织来提高其硬度提供了一种有效的方法。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.