Enhancement of mechanical properties and toughening mechanisms in high-entropy RETaO4 (RE = Y, Gd, Yb, Dy, Sm) ceramics

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

Materials Characterization Pub Date : 2025-04-14 DOI:10.1016/j.matchar.2025.115025

Qian Wen , Xiaopeng Hu , Junyao Wu , Qing Liu , Sai Liu , Duzhong Zhu , Jinwei Guo , Wang Zhu

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Abstract

Medium-high entropy RETaO₄ (RE = Y, Gd, Yb, Dy, Sm) ceramics are prepared by high-temperature solid-state reaction. Results show that doping rare earth ions into the A site improves the hardness, elastic modulus, fracture toughness, and fracture strength of the ceramics. As the solid solution components increase, hardness rises from 5.19 GPa to 7.43 GPa, elastic modulus from 55.2 GPa to 88.8 GPa, fracture toughness from 1.10 MPa·m^1/2 to 2.05 MPa·m^1/2, and fracture strength from 31.8 MPa to 58.6 MPa. This enhancement is attributed to higher lattice distortion, increased internal energy, and stronger bonding. The proportion of transgranular fracture increases with solid solution content. Ferroelastic domain structures cause crack tip deflection, leading to greater fracture energy absorption. Furthermore, high-entropy and lattice distortion effects in (5RE_1/5)TaO₄ ceramics promote high-density dislocation regions under stress, enhancing dislocation toughening.

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高熵RETaO4 （RE = Y, Gd, Yb, Dy, Sm）陶瓷的力学性能增强及增韧机理

采用高温固相反应法制备中高熵RETaO4 （RE = Y, Gd, Yb, Dy, Sm）陶瓷。结果表明，稀土离子在A位的掺入提高了陶瓷的硬度、弹性模量、断裂韧性和断裂强度。随着固溶体组分的增加，硬度从5.19 GPa增加到7.43 GPa，弹性模量从55.2 GPa增加到88.8 GPa，断裂韧性从1.10 MPa·m1/2增加到2.05 MPa·m1/2，断裂强度从31.8 MPa增加到58.6 MPa。这种增强是由于更高的晶格畸变、增加的内能和更强的键合。穿晶断裂比例随着固溶体含量的增加而增加。铁弹性畴结构导致裂纹尖端偏转，导致更大的断裂能吸收。此外，（5RE1/5）陶4陶瓷中的高熵效应和晶格畸变效应在应力作用下促进了高密度位错区，增强了位错的韧化。

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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.