Enhanced mechanical properties and atomic-scale mechanisms of ferroelastic domain switching for GdNbO4-La2Zr2O7 materials

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Scripta Materialia Pub Date : 2024-09-16 DOI:10.1016/j.scriptamat.2024.116374

Xuezhen Cao , Yizhe Li , Ying Chen , Gyn Brewster , David A. Hall , Sarah J. Haigh , João P. Martins , Ping Xiao

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Abstract

Optimization of mechanical properties in La₂Zr₂O₇ (LZO) ceramics, composites and coatings is an on-going requirement for their practical application. Herein, the contribution of monoclinic (La, Gd)NbO₄ (m-LGNO) enhancement of fracture toughness by ∼56% reveals its capability to be a prominent toughening agent. Due to the ferroelastic nature of LGNO, ferroelastic switching takes place within the stress concentrated regions, giving rise to significant strain energy relaxation. Atomic-scale evidence reveals that ferroelastic 94°/86° domain switching can occur, yielding merged 94° domains and newly formed 86° domains. The relevant strains induced by ferroelastic domain switching are quantified up to 8.06% and 6.20% in shear and normal strain, respectively. Such domain switching strains highlight their contribution to accommodate external mechanical loading for the 50 mol% GNO-LZO composite. The results indicate that the unique ferroelastic nature and 94°/86° ferroelastic domain switching in m-LGNO cooperatively provide a significant toughening effect.

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增强 GdNbO4-La2Zr2O7 材料的力学性能和铁弹性畴切换的原子尺度机制

优化 La2Zr2O7 (LZO) 陶瓷、复合材料和涂层的机械性能是其实际应用的一项长期要求。在这里，单斜（La, Gd）NbO4（m-LGNO）将断裂韧性提高了 ∼ 56%，这显示了它作为一种重要增韧剂的能力。由于 LGNO 具有铁弹性，因此在应力集中区域会发生铁弹性转换，从而产生显著的应变能松弛。原子尺度证据显示，94°/86°铁弹性畴切换会发生，产生合并的 94°畴和新形成的 86°畴。铁弹性畴切换引起的相关应变在剪切应变和法向应变中的定量分别高达 8.06% 和 6.20%。这种畴切换应变凸显了 50 mol% GNO-LZO 复合材料在适应外部机械负载方面的贡献。结果表明，m-LGNO 中独特的铁弹性性质和 94°/86° 铁弹性畴切换共同提供了显著的增韧效果。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.