Investigation of microstructure and mechanical properties of HfB2-HfC-TiC-B4C composites

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-04-21 DOI:10.1016/j.matchemphys.2025.130927

Parisa Chenari , Zohre Balak , Vahideh Shahedifar

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Abstract

To examine the microstructure and mechanical properties of boride-carbide composites, four quaternary composites with the following chemical compositions were synthesized: 70HfB2-10HfC-10TiC–10B4C (7HHTB), 70HfB2-10HfC-10TiC–10B4C/Nb (7HHTB/Nb), HfB2-HfC-TiC-B4C (HHTB), and HfB2-HfC-TiC-B4C/Nb (HHTB/Nb). These composites were densified using the spark plasma sintering (SPS) method at 2000 °C. The phase composition and microstructure were analyzed through X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The sintering performance of all composites was assessed by measuring relative density using the Archimedes method. Hardness and fracture toughness were determined via Vickers indentation and crack length measurements. The findings indicated that solid solutions of (Hf_1-xTi_x) B₂ and (Hf_1-xTi_x) C formed during sintering, with higher quantities present in composites with equal volume fractions of constituents compared to those with a 7:1:1:1 ratio, as well as in samples containing 2 wt% Nb versus those without. The highest fracture toughness recorded value was 5.7 MPa m^0.5, with a maximum hardness of 30.6 GPa, for the fully dense HHTB/Nb composite, which also exhibited the finest grain size of 0.52 μm.

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HfB2-HfC-TiC-B4C复合材料的显微组织和力学性能研究

为了研究硼化物-碳化物复合材料的微观结构和力学性能，合成了四种化学成分为70HfB2-10HfC-10TiC-10B4C （7HHTB）、70HfB2-10HfC-10TiC-10B4C /Nb （7HHTB/Nb）、HfB2-HfC-TiC-B4C （HHTB）和HfB2-HfC-TiC-B4C/Nb （HHTB/Nb）的季元复合材料。采用放电等离子烧结（SPS）方法在2000℃下对复合材料进行致密化处理。通过x射线衍射（XRD）和场发射扫描电镜（FE-SEM）分析了材料的相组成和微观结构。采用阿基米德法测定相对密度，评价复合材料的烧结性能。硬度和断裂韧性通过维氏压痕和裂纹长度测量来确定。结果表明，（Hf1-xTix） B2和（Hf1-xTix） C的固溶体在烧结过程中形成，在成分体积分数相等的复合材料中，与7:1:1:1比的复合材料相比，含量更高，在含有2wt % Nb的样品中，含量也高于不含Nb的样品。全致密htb /Nb复合材料的最高断裂韧性为5.7 MPa m0.5，最大硬度为30.6 GPa，最小晶粒尺寸为0.52 μm。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.