Mo和Nb对W-Ni-Fe-Co基重钨合金液相烧结及力学性能的影响

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-14 DOI:10.1016/j.matchar.2025.115034

Indeevar Singh , Vikram Dabhade , Mayadhar Debata , Ajit Panigrahi

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引用次数: 0

摘要

为了提高钨重合金动能穿甲弹的自锐性能，在其成分和加工技术方面进行了创新。Mo和Nb分别因其晶粒细化能力和较低的热性能而成为重钨合金的两种潜在合金元素。因此，本研究考察了Mo和Nb在1.25、2.5和3.75% wt%浓度下对组成为90w - (6,2,2)（Ni:Fe:Co）的WHA的影响。合金在1500℃的还原性氢气气氛中烧结60 min，结果表明，Mo的加入使钨晶粒细化，而Nb的加入使晶粒略微长大。在1175℃下，Ni-Nb二元共晶反应导致了钨晶粒生长的早期液相形成。此外，Nb的加入导致了NbO2的形成，并在基体中形成了富Nb的贫铁条带和通道。随着Mo和Nb浓度的增加，合金中未溶解的钨含量增加，合金的邻接度和二面角增加。钼的加入使钨的晶粒细化，基体固溶强化，钨的邻接性增加，从而提高了合金的抗压强度。在低Nb浓度下，由于孔隙的形成，添加Nb导致抗压强度较差，而在高Nb浓度下，由于溶液强化、连续性增加和孔隙率最小化，抗压强度有所增加。

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The influence of Mo and Nb on liquid phase sintering and mechanical properties of W-Ni-Fe-Co based tungsten heavy alloy

Efforts to enhance the self-sharpening properties of tungsten heavy alloy based kinetic energy penetrators have led to innovations in its compositions and processing techniques. Mo and Nb are the two potential alloying elements for tungsten heavy alloys (WHA) due to their grain refinement capabilities and lower thermal properties respectively. Accordingly, this research investigates the influence of Mo and Nb addition to a WHA of composition 90 W- (6,2,2)(Ni:Fe:Co) in concentrations of 1.25, 2.5 and 3.75 wt%. The alloys were sintered at 1500 °C in a reducing hydrogen atmosphere for 60 min. The results demonstrated tungsten grain refinement with Mo addition, whereas Nb addition resulted in a slight grain growth. Ni-Nb binary eutectic reactions at 1175 °C lead to an early liquid phase formation expanding the time regime for tungsten grain growth. Additionally, Nb addition caused NbO₂ formation and Nb–rich Fe–lean strips and channels to form in the matrix. Increase in contiguity and dihedral angle was observed with increase in Mo and Nb concentration due to higher undissolved tungsten in the alloy. Mo addition resulted in enhanced compressive strength due to refined tungsten grain size, matrix solid solution strengthening and increased tungsten contiguity. Whereas Nb addition resulted in poor compressive strength at lower Nb concentrations due to pore formation, however the compressive strength was found to increase at higher Nb concentration due to solution strengthening, increase in contiguity and minimized porosity.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.