Resolving the hardness–toughness trade-off dilemma of metal/ceramic multilayer films by introducing gradient structure

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-08-29 DOI:10.1111/jace.20112

Wentao Zhang, Kaiwen Wang, Rui Zhang, Xinlei Gu, Jingjie Pan, Zhongzhen Wu, Xiyao Zhang, Wen Mao, Kan Zhang

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Abstract

Equal-period modulated metal/ceramic multilayers have shown promise in enhancing the toughness of ceramic thin films. However, this toughness enhancement typically comes at the sacrifice of hardness, limiting their potential applications. To tackle this issue, this study designed and fabricated two gradient-structured multilayer variations using Ta/TaB₂: one with a higher ceramic layer fraction near the surface (M2) and the other with a converse structure (M3). A conventional equal modulation period Ta/TaB₂ multilayer film (M1) served as a reference. M2 exhibited superior performance, with a 30% hardness increase and significant toughness enhancement compared to M1. Conversely, M3 experienced failure due to excessive thermal stress from its unique gradient structure. Finite element simulations revealed that M2's structure could alleviate in-plane stress and enhance loading uniformity, thus enhancing the film's toughness. These findings suggest that a well-designed gradient structure holds promise for concurrently improving the hardness and toughness of metal/ceramic multilayer films.

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通过引入梯度结构解决金属/陶瓷多层薄膜的硬度-韧性权衡难题

等周期调制金属/陶瓷多层膜在提高陶瓷薄膜的韧性方面大有可为。然而，这种韧性的增强通常是以牺牲硬度为代价的，从而限制了它们的潜在应用。为了解决这个问题，本研究使用 Ta/TaB2 设计并制造了两种梯度结构的多层变化：一种是靠近表面的陶瓷层比例较高 (M2)，另一种是相反的结构 (M3)。传统的等调制周期 Ta/TaB2 多层薄膜（M1）作为参照。与 M1 相比，M2 表现出更优越的性能，硬度提高了 30%，韧性显著增强。相反，M3 则由于其独特的梯度结构产生了过大的热应力而失效。有限元模拟显示，M2 的结构可以减轻面内应力，提高加载均匀性，从而增强薄膜的韧性。这些发现表明，设计良好的梯度结构有望同时提高金属/陶瓷多层薄膜的硬度和韧性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.