Wenxue Fan, Yu Bai, Tianxin Li, Hai Hao, Xingguo Zhang
{"title":"硬板轧制和退火处理对 NbB2 粒子增强 AZ91 复合材料微观结构和力学性能的影响","authors":"Wenxue Fan, Yu Bai, Tianxin Li, Hai Hao, Xingguo Zhang","doi":"10.1016/j.jma.2024.09.005","DOIUrl":null,"url":null,"abstract":"In this study, a NbB<sub>2</sub>/AZ91 composite exhibiting desirable mechanical properties was fabricated using a sample casting technique, followed by hard-plate rolling and short-term annealing. The effect of NbB<sub>2</sub> particles on the microstructural evolution of the AZ91 alloy was investigated. The presence of NbB<sub>2</sub> was shown to have a grain-refining effect on the AZ91 alloy and promoted dynamic recrystallization (DRX) and precipitation of fine Mg<sub>17</sub>Al<sub>12</sub> phases via particle-stimulated nucleation (PSN). Tensile testing revealed substantial enhancements in the ultimate tensile strength (UTS), yield strength (YS), and elongation (EL) of the as-rolled AZ91 alloy, with values of 379 MPa, 292 MPa, and 14.7 %, respectively, owing to the incorporation of NbB<sub>2</sub> particles. Annealing led to further enhancements in EL with slight reductions in UTS and YS (360 MPa, 252 MPa, and 16.8 %, respectively). Owing to grain refinement and the PSN effect of the NbB<sub>2</sub> particles, a significant number of geometrically necessary dislocations (GNDs) were induced in the matrix during the rolling process, which reduces the nucleation barrier and increases the number of nucleation sites for the recrystallized grains and Mg<sub>17</sub>Al<sub>12</sub> precipitates. Meanwhile, many residual dislocations and fine Mg<sub>17</sub>Al<sub>12</sub> precipitates in the as-rolled alloys were annihilated during annealing, resulting in slight grain growth and coarsening. The strengthening mechanism of the NbB<sub>2</sub>/AZ91 composite are mainly associated with grain-refinement strengthening, particle-induced dislocation strengthening, strengthening resulting from mismatching coefficients of thermal expansion (CTE), and hetero-deformation-induced (HDI) strengthening. Textural weakening, increased activation of non-basal slip systems, more-uniform strain patterns resulting from NbB<sub>2</sub> particles, and precipitation are mainly responsible for enhancing ductility.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"77 1","pages":""},"PeriodicalIF":15.8000,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of hard-plate rolling and annealing treatment on the microstructure and mechanical properties of NbB2 particle-reinforced AZ91 composite\",\"authors\":\"Wenxue Fan, Yu Bai, Tianxin Li, Hai Hao, Xingguo Zhang\",\"doi\":\"10.1016/j.jma.2024.09.005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this study, a NbB<sub>2</sub>/AZ91 composite exhibiting desirable mechanical properties was fabricated using a sample casting technique, followed by hard-plate rolling and short-term annealing. The effect of NbB<sub>2</sub> particles on the microstructural evolution of the AZ91 alloy was investigated. The presence of NbB<sub>2</sub> was shown to have a grain-refining effect on the AZ91 alloy and promoted dynamic recrystallization (DRX) and precipitation of fine Mg<sub>17</sub>Al<sub>12</sub> phases via particle-stimulated nucleation (PSN). Tensile testing revealed substantial enhancements in the ultimate tensile strength (UTS), yield strength (YS), and elongation (EL) of the as-rolled AZ91 alloy, with values of 379 MPa, 292 MPa, and 14.7 %, respectively, owing to the incorporation of NbB<sub>2</sub> particles. Annealing led to further enhancements in EL with slight reductions in UTS and YS (360 MPa, 252 MPa, and 16.8 %, respectively). Owing to grain refinement and the PSN effect of the NbB<sub>2</sub> particles, a significant number of geometrically necessary dislocations (GNDs) were induced in the matrix during the rolling process, which reduces the nucleation barrier and increases the number of nucleation sites for the recrystallized grains and Mg<sub>17</sub>Al<sub>12</sub> precipitates. Meanwhile, many residual dislocations and fine Mg<sub>17</sub>Al<sub>12</sub> precipitates in the as-rolled alloys were annihilated during annealing, resulting in slight grain growth and coarsening. The strengthening mechanism of the NbB<sub>2</sub>/AZ91 composite are mainly associated with grain-refinement strengthening, particle-induced dislocation strengthening, strengthening resulting from mismatching coefficients of thermal expansion (CTE), and hetero-deformation-induced (HDI) strengthening. Textural weakening, increased activation of non-basal slip systems, more-uniform strain patterns resulting from NbB<sub>2</sub> particles, and precipitation are mainly responsible for enhancing ductility.\",\"PeriodicalId\":16214,\"journal\":{\"name\":\"Journal of Magnesium and Alloys\",\"volume\":\"77 1\",\"pages\":\"\"},\"PeriodicalIF\":15.8000,\"publicationDate\":\"2024-09-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Magnesium and Alloys\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.jma.2024.09.005\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"METALLURGY & METALLURGICAL ENGINEERING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnesium and Alloys","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jma.2024.09.005","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
Effect of hard-plate rolling and annealing treatment on the microstructure and mechanical properties of NbB2 particle-reinforced AZ91 composite
In this study, a NbB2/AZ91 composite exhibiting desirable mechanical properties was fabricated using a sample casting technique, followed by hard-plate rolling and short-term annealing. The effect of NbB2 particles on the microstructural evolution of the AZ91 alloy was investigated. The presence of NbB2 was shown to have a grain-refining effect on the AZ91 alloy and promoted dynamic recrystallization (DRX) and precipitation of fine Mg17Al12 phases via particle-stimulated nucleation (PSN). Tensile testing revealed substantial enhancements in the ultimate tensile strength (UTS), yield strength (YS), and elongation (EL) of the as-rolled AZ91 alloy, with values of 379 MPa, 292 MPa, and 14.7 %, respectively, owing to the incorporation of NbB2 particles. Annealing led to further enhancements in EL with slight reductions in UTS and YS (360 MPa, 252 MPa, and 16.8 %, respectively). Owing to grain refinement and the PSN effect of the NbB2 particles, a significant number of geometrically necessary dislocations (GNDs) were induced in the matrix during the rolling process, which reduces the nucleation barrier and increases the number of nucleation sites for the recrystallized grains and Mg17Al12 precipitates. Meanwhile, many residual dislocations and fine Mg17Al12 precipitates in the as-rolled alloys were annihilated during annealing, resulting in slight grain growth and coarsening. The strengthening mechanism of the NbB2/AZ91 composite are mainly associated with grain-refinement strengthening, particle-induced dislocation strengthening, strengthening resulting from mismatching coefficients of thermal expansion (CTE), and hetero-deformation-induced (HDI) strengthening. Textural weakening, increased activation of non-basal slip systems, more-uniform strain patterns resulting from NbB2 particles, and precipitation are mainly responsible for enhancing ductility.
期刊介绍:
The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.