Unveiling tensile creep mechanisms of W-Re-HfC alloys at elevated temperatures

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-08-05 DOI:10.1016/j.ijrmhm.2025.107358

Shuai Ma , Di Dong , Ye Gao , Zhuangzhi Wu , Dezhi Wang

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Abstract

This study systematically investigates the tensile creep properties and failure mechanisms of the W-Re-HfC (tungsten‑rhenium-HfC) alloy under near service temperatures of 1600–2000 °C with stresses of 40–80 MPa. Results show the corresponding stress exponent varies from 2.56 to 4.04, while the creep activation energy ranges from 372.4 to 569.5 kJ·mol⁻¹. Besides, the Larson-Miller parameter model demonstrates excellent predictive capability for creep life. The dominant creep mechanism shifts from the diffusion-controlled creep at 1600 °C to the dislocation-dominated type at 1800 °C. Microstructural analysis reveals interactions between creep deformation and recrystallization that influence the creep mechanism. And HfC particles effectively inhibit dislocation motion and grain boundary sliding, enhancing creep resistance. Slip bands collisions with grain boundaries play a role in dislocation creep failure. This work provides essential theoretical insights and data support for the engineering design of W-Re-HfC alloys in aerospace, nuclear energy, and semiconductor industries.

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揭示W-Re-HfC合金高温拉伸蠕变机理

本研究系统地研究了W-Re-HfC（钨铼- hfc）合金在近使用温度为1600-2000℃、应力为40-80 MPa下的拉伸蠕变性能和破坏机制。结果表明：相应的应力指数在2.56 ~ 4.04之间，蠕变活化能在372.4 ~ 569.5 kJ·mol−1之间。Larson-Miller参数模型对蠕变寿命具有较好的预测能力。1600℃时，主导蠕变机制由扩散控制蠕变转变为位错主导蠕变。微观组织分析揭示了蠕变变形和再结晶之间的相互作用对蠕变机理的影响。HfC颗粒能有效抑制位错运动和晶界滑动，增强抗蠕变能力。滑移带与晶界的碰撞是位错蠕变破坏的主要原因。这项工作为W-Re-HfC合金在航空航天、核能和半导体工业中的工程设计提供了重要的理论见解和数据支持。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.