{"title":"剧烈塑性变形对铌晶界组织和状态的影响","authors":"V. V. Popov, E. N. Popova, E. V. Osinnikov","doi":"10.1007/s12540-024-01871-x","DOIUrl":null,"url":null,"abstract":"<div><p>The effect of severe plastic deformation by high-pressure torsion (HPT) on the formation of nanocrystalline structure in niobium has been studied by the methods of transmission electron microscopy, scanning tunneling microscopy, X-ray diffraction analysis and microhardness measurements. The thermal stability of the resulting structure has been analyzed. Specific features of grain boundaries (GBs) formed under the severe plastic deformation have been considered and analyzed. It is demonstrated that a considerable fraction of these boundaries are in the so-called nonequilibrium, or deformation-modified state, characterized by higher free energy and larger free volume in comparison with those of common relaxed GBs. It has been shown that contribution of nonequilibrium GBs to total strengthening is relatively small.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"31 7","pages":"2069 - 2081"},"PeriodicalIF":4.0000,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Severe Plastic Deformation on the Structure and State of Grain Boundaries in Niobium\",\"authors\":\"V. V. Popov, E. N. Popova, E. V. Osinnikov\",\"doi\":\"10.1007/s12540-024-01871-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The effect of severe plastic deformation by high-pressure torsion (HPT) on the formation of nanocrystalline structure in niobium has been studied by the methods of transmission electron microscopy, scanning tunneling microscopy, X-ray diffraction analysis and microhardness measurements. The thermal stability of the resulting structure has been analyzed. Specific features of grain boundaries (GBs) formed under the severe plastic deformation have been considered and analyzed. It is demonstrated that a considerable fraction of these boundaries are in the so-called nonequilibrium, or deformation-modified state, characterized by higher free energy and larger free volume in comparison with those of common relaxed GBs. It has been shown that contribution of nonequilibrium GBs to total strengthening is relatively small.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":703,\"journal\":{\"name\":\"Metals and Materials International\",\"volume\":\"31 7\",\"pages\":\"2069 - 2081\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2025-01-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Metals and Materials International\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12540-024-01871-x\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metals and Materials International","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s12540-024-01871-x","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Effect of Severe Plastic Deformation on the Structure and State of Grain Boundaries in Niobium
The effect of severe plastic deformation by high-pressure torsion (HPT) on the formation of nanocrystalline structure in niobium has been studied by the methods of transmission electron microscopy, scanning tunneling microscopy, X-ray diffraction analysis and microhardness measurements. The thermal stability of the resulting structure has been analyzed. Specific features of grain boundaries (GBs) formed under the severe plastic deformation have been considered and analyzed. It is demonstrated that a considerable fraction of these boundaries are in the so-called nonequilibrium, or deformation-modified state, characterized by higher free energy and larger free volume in comparison with those of common relaxed GBs. It has been shown that contribution of nonequilibrium GBs to total strengthening is relatively small.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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