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放电等离子烧结制备的二硼化钛增强钛基复合材料的磨损及力学性能评估

Evaluation of the Wear and Mechanical Properties of Titanium Diboride-Reinforced Titanium Matrix Composites Prepared by Spark Plasma Sintering.

作者信息

Ayodele Olusoji Oluremi, Babalola Bukola Joseph, Olubambi Peter Apata

机构信息

Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Johannesburg 2028, South Africa.

出版信息

Materials (Basel). 2023 Mar 3;16(5):2078. doi: 10.3390/ma16052078.

DOI:10.3390/ma16052078
PMID:36903192
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10003867/
Abstract

The synthesis of x-wt.% (where x = 2.5, 5, 7.5, and 10) TiB-reinforced titanium matrix was accomplished through the spark plasma sintering technique (SPS). The sintered bulk samples were characterized, and their mechanical properties were evaluated. Near full density was attained, with the sintered sample having the least relative density of 97.5%. This indicates that the SPS process aids good sinterability. The Vickers hardness of the consolidated samples improved from 188.1 HV1 to 304.8 HV1, attributed to the high hardness of the TiB. The tensile strength and elongation of the sintered samples decreased with increasing TiB content. The nano hardness and reduced elastic modulus of the consolidated samples were upgraded due to the addition of TiB, with the Ti-7.5 wt.% TiB sample showing the maximum values of 9841 MPa and 188 GPa, respectively. The microstructures display the dispersion of whiskers and in-situ particles, and the X-ray diffraction analysis (XRD) showed new phases. Furthermore, the presence of TiB particles in the composites enhanced better wear resistance than the unreinforced Ti sample. Due to dimples and large cracks, ductile and brittle fracture behavior was noticed in the sintered composites.

摘要

通过放电等离子烧结技术（SPS）制备了x-wt.%（其中x = 2.5、5、7.5和10）TiB增强钛基复合材料。对烧结后的块状样品进行了表征，并评估了它们的力学性能。烧结样品的相对密度最低为97.5%，接近全密度。这表明SPS工艺有助于良好的烧结性。由于TiB硬度高，固结样品的维氏硬度从188.1 HV1提高到304.8 HV1。烧结样品的抗拉强度和伸长率随TiB含量的增加而降低。由于添加了TiB，固结样品的纳米硬度和折合弹性模量得到提升，Ti-7.5 wt.% TiB样品的纳米硬度和折合弹性模量分别显示出最大值9841 MPa和188 GPa。微观结构显示晶须和原位颗粒的分散，X射线衍射分析（XRD）显示有新相。此外，与未增强的Ti样品相比，复合材料中TiB颗粒的存在增强了耐磨性。由于出现凹坑和大裂纹，在烧结复合材料中观察到韧性和脆性断裂行为。

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