{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T13:43:00Z","timestamp":1790948580800,"version":"4.1.0"},"reference-count":57,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52504341"],"award-info":[{"award-number":["52504341"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["52504341"],"award-info":[{"award-number":["52504341"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Major Science and Technology Special Plan of Shandong Provincial Department of Science and Technology","award":["2024CXGC010317"],"award-info":[{"award-number":["2024CXGC010317"]}]},{"name":"Major Science and Technology Special Plan of Yunnan Provincial Department of Science and Technology","award":["21610037"],"award-info":[{"award-number":["21610037"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Boron carbide (B4C) holds significant application potential in the fields of lightweight, high-hardness protective and high-end wear-resistant components due to its low density and exceptional hardness. However, its strong covalent bonding leads to low sintering activity and weak grain-boundary cohesion, resulting in high brittleness and crack sensitivity. These inherent properties make it difficult to achieve simultaneous full densification and toughness enhancement, severely limiting the reliability of B4C under complex service conditions. Although diamond is an attractive reinforcement because of its high elastic modulus and low coefficient of thermal expansion, the simultaneous realization of densification, graphitization suppression, and fracture-resistance improvement in diamond\/B4C composites remains insufficiently understood. In this study, diamond particles were introduced into the B4C matrix and consolidated by rapid high-temperature and high-pressure (HTHP) sintering to synergistically promote densification and fracture toughening. The effects of sintering temperature and diamond content on phase evolution, densification, microstructure, and mechanical properties were systematically investigated, and the associated toughening mechanisms were analyzed. The results indicate that the hardness generally increases with rising sintering temperature and diamond content. The primary toughening mechanisms are identified as the pull-out of diamond particles and crack deflection induced by residual stresses generated during the cooling process. Although the composite with 20 wt.% diamond exhibits higher hardness, it also experiences severe macroscopic cracking. The composite with 10 wt.% diamond sintered at 1450 \u00b0C under 5.3 GPa for 4 min exhibits the optimal balance of properties, achieving a relative density of 98.85%, a Vickers hardness of 40.72 GPa, and a fracture toughness of 9.20 MPa\u00b7m1\/2. This work confirms the effectiveness of combining diamond reinforcement with HTHP sintering in simultaneously achieving densification and toughening of B4C-based composites, providing a new pathway for developing high-performance lightweight protective ceramics.<\/jats:p>","DOI":"10.3390\/ma19132708","type":"journal-article","created":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T03:20:21Z","timestamp":1782357621000},"page":"2708","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Enhanced Fracture Toughness in Diamond\/B4C Composites Through Residual-Stress-Induced Crack Deflection"],"prefix":"10.3390","volume":"19","author":[{"given":"Yiyang","family":"Zhan","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3249-0430","authenticated-orcid":false,"given":"Zhengxin","family":"Li","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mu","family":"Qiao","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yujie","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuefei","family":"Fang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yakun","family":"Lan","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5259-4267","authenticated-orcid":false,"given":"Guangli","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6579-1913","authenticated-orcid":false,"given":"Yuanmin","family":"Zou","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering, Aalto University, 00076 Espoo, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenjie","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenyang","family":"Shi","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1111\/ijac.13423","article-title":"Pressureless sintering and properties of boron carbide composite materials","volume":"17","author":"Martin","year":"2020","journal-title":"Int. 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