Microstructure and mechanical properties of FeCrVTa0.1W0.1Ti0.1Cx multi-principal element alloys

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-18 DOI:10.1016/j.msea.2025.149152

Wei Guo , Ziheng Cao , Longfeng Li , Mi Zhao , Shusen Wu

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Abstract

The present study investigates the role of carbon content (0–7 at.%) in tailoring the microstructure and mechanical properties of low-activation FeCrVTa_0.1W_0.1Ti_0.1C_x multi-principal element alloys. Increasing carbon content transforms precipitates from Laves phases to MC-type carbides (M = Ti, Ta, V). At 1 at.% C, grain refinement (∼15.33 μm) and optimized Laves phase distribution yields high strength (1702 MPa of yield stress) and ductility (18.8 % of fracture strain). Higher carbon content (≥3 at.%) promotes intragranular carbide dispersion and grain coarsening (∼44.98 μm), enhancing plasticity (35.8 % of fracture strain at 5 at.% C) but reducing strength. Fracture mode transitions from brittle (cleavage) to ductile-dominated (dimples) with C addition. The present work establishes carbon-mediated phase competition as a key design strategy for structural low activation multi-principal element alloys.

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FeCrVTa0.1W0.1Ti0.1Cx多主元素合金的组织与力学性能

本研究探讨了碳含量（0-7 at）的作用。%)，以适应低活化的FeCrVTa0.1W0.1Ti0.1Cx多主元素合金的组织和力学性能。随着碳含量的增加，析出物由Laves相转变为mc型碳化物（M = Ti, Ta， V）。1点。% C、晶粒细化（~ 15.33 μm）和优化的Laves相分布可获得高强度（屈服应力为1702 MPa）和高延展性（断裂应变为18.8%）。含碳量高（≥3 at）。%)促进晶内碳化物弥散和晶粒粗化（~ 44.98 μm），提高塑性（5 at时断裂应变的35.8%）。% C)但降低了强度。随着C的加入，断裂模式从脆性（解理）转变为延性主导（韧窝）。本文建立了碳介导相竞争作为结构低活化多主元素合金的关键设计策略。

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

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.