{"title":"循环应变多晶铜晶间断口附近的位错结构","authors":"Jaroslav Polák, Ladislav Poczklán, Tomáš Vražina","doi":"10.1111/ffe.14663","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 10<sup>5</sup> to 10<sup>7</sup> cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub-boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain-induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active.</p>\n </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"48 7","pages":"3110-3121"},"PeriodicalIF":3.2000,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper\",\"authors\":\"Jaroslav Polák, Ladislav Poczklán, Tomáš Vražina\",\"doi\":\"10.1111/ffe.14663\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n <p>Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 10<sup>5</sup> to 10<sup>7</sup> cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub-boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain-induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active.</p>\\n </div>\",\"PeriodicalId\":12298,\"journal\":{\"name\":\"Fatigue & Fracture of Engineering Materials & Structures\",\"volume\":\"48 7\",\"pages\":\"3110-3121\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2025-04-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fatigue & Fracture of Engineering Materials & Structures\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/ffe.14663\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fatigue & Fracture of Engineering Materials & Structures","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/ffe.14663","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper
Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 105 to 107 cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub-boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain-induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active.
期刊介绍:
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.