Balancing strength and toughness of nacre-inspired (TiBw-TiB2p)/Al hybrid composites by regulating Ti addition

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

Materials Characterization Pub Date : 2025-05-02 DOI:10.1016/j.matchar.2025.115123

Jidong Zhang , Xuexi Zhang , Mingfang Qian , Junjian Zhou , Lin Geng

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引用次数: 0

Abstract

To address the problem of hot cracking caused by high temperature sintering for monolithic TiB₂ particle (TiB_2p) preforms, Ti particles were added to induce the an in-situ reaction Ti + TiB₂ → TiBw to create TiB whisker (TiBw) and reduce the sintering temperature of TiB_2p preforms. Nacre-inspired (TiBw-TiB_2p)/Al composites were prepared by freeze casting and pressure infiltration, and the microstructure and mechanical properties of the composites were tailored by regulating the Ti addition content. The addition of Ti particles altered the ceramic-rich layer thickness and the type/distribution of intermetallic compounds in the composites. The effect of Ti content on the flexural strength and fracture toughness of the composites was investigated. The results showed that 5Ti composite exhibited optimum mechanical properties with flexural strength of 811 MPa, crack initiation toughness (K_Ic) of 19.1 MPa·m^1/2 and crack growth toughness (K_Jc) of 24.9 MPa·m^1/2. The enhanced strength was mainly attributed to the hetero-deformation induced (HDI) hardening, while the improved toughness was due to multiple crack branching, deflection and blunting.

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通过调节Ti的添加量平衡珠核激发(TiBw-TiB2p)/Al杂化复合材料的强度和韧性

为解决TiB2p单片预制体高温烧结时热裂的问题，通过添加Ti颗粒诱导原位反应Ti + TiB2→TiBw生成TiB晶须（TiBw），降低TiB2p预制体的烧结温度。采用冷冻铸造和压力浸渗法制备了珠核激发(TiBw-TiB2p)/Al复合材料，并通过调节Ti的添加量来调整复合材料的组织和力学性能。Ti颗粒的加入改变了复合材料中富陶瓷层的厚度和金属间化合物的类型和分布。研究了钛含量对复合材料抗弯强度和断裂韧性的影响。结果表明，5Ti复合材料的抗折强度为811 MPa，裂纹萌生韧性（KIc）为19.1 MPa·m1/2，裂纹扩展韧性（KJc）为24.9 MPa·m1/2，力学性能最佳。强度的提高主要是由于异质变形诱导的硬化，而韧性的提高主要是由于多裂纹分支、挠曲和钝化。

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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.