Effects of layer thickness ratio on residual stress, microstructure and mechanical properties of TiB2-TiC/TiB2-TiN laminated ceramics

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2024-11-21 DOI:10.1007/s10853-024-10117-5

Zongzhe Yang, Jiaojiao Gao, Jinpeng Song, Yao Wang

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Abstract

TiB₂-TiC/TiB₂-TiN (TC/TN) laminated ceramics were fabricated, and effects of layer thickness ratio (LTR) on their residual stress, microstructure and mechanical properties were investigated. Residual compressive stress (RCS) and residual tensile stress distributed alternately with the alternation of TC and TN; with an increase in the LTR, the RCS decreased. The fracture mode of the ceramic consisted of transgranular fracture and intergranular fracture. Compared with the TN, the TC had less micro-void defects. With the LTR increasing, the fracture mode of the TC or TN was almost unchanged, and the variation of the number of microdefects was small; Vickers hardness (VH) and fracture toughness (FT) declined, while flexural strength (FS) first improved and then declined; at the same LTR, the TC had better VH and FT than the TN. When the LTR was 0.75, this ceramic had better comprehensive mechanical properties: VH of the TC and TN was 20.9 ± 0.2 GPa and 16.3 ± 0.3 GPa, respectively; FT of the TC and TN was 6.5 ± 0.1 MPa·m^1/2 and 6.1 ± 0.2 MPa·m^1/2, respectively; and FS was 748 ± 12 MPa. For TiB₂-based ceramics, this research to a certain extent played a great role on the road of exploration for improving their properties.

Graphical Abstract

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层厚比对TiB2-TiC/TiB2-TiN复合陶瓷残余应力、微观结构和力学性能的影响

制备了TiB2-TiC/TiB2-TiN （TC/TN）层状陶瓷，研究了层厚比（LTR）对其残余应力、微观结构和力学性能的影响。残余压应力（RCS）和残余拉应力随TC和TN的交替而交替分布；随着LTR的增加，RCS降低。陶瓷的断裂方式为穿晶断裂和沿晶断裂。与TN相比，TC的微孔缺陷较少。随着LTR的增大，TC和TN的断裂模式基本不变，微缺陷数量变化较小；维氏硬度（VH）和断裂韧性（FT）下降，抗弯强度（FS）先提高后下降；在相同的LTR下，TC的VH和FT优于TN，当LTR为0.75时，该陶瓷的综合力学性能更好：TC和TN的VH分别为20.9±0.2 GPa和16.3±0.3 GPa；TC和TN的FT分别为6.5±0.1 MPa·m1/2和6.1±0.2 MPa·m1/2；FS为748±12 MPa。对于tib2基陶瓷来说，本研究在一定程度上对改善其性能的探索之路上起到了很大的作用。图形抽象

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.