{"title":"利用闪烁 DSC 研究 Ce68Al10Cu20Co2 块状金属玻璃的玻璃转变和结晶过程","authors":"Zikang Wei, Chenhui Wang, Luojia Zhang, Jintao Luo, Yulai Gao, Bingge Zhao","doi":"10.1557/s43578-024-01339-z","DOIUrl":null,"url":null,"abstract":"<p>In this study, glass transition and crystallization of Ce<sub>68</sub>Al<sub>10</sub>Cu<sub>20</sub>Co<sub>2</sub> bulk metallic glass at heating rates ranging from 0.083 to 14,000 K/s, covering six orders of magnitude, are investigated. For the glass transition, two linear regions with different apparent activation energies (<i>E</i><sub>a,g</sub>) are distinguished by a critical heating rate of 2000 K/s: <i>E</i><sub>a,g</sub> decreases from 208.7 to 67.3 kJ/mol with the increase of heating rate. During the crystallization, the nucleation rate and crystal growth rate between <i>T</i><sub>g</sub> and <i>T</i><sub>m</sub> are calculated. According to their dependence on temperature, the contact angle for the nucleation of Ce crystals is estimated at 11–14 degrees. For the crystal growth, a maximum crystal growth rate of 0.03 m/s is found at 0.97 <i>T</i><sub>m</sub>. Moreover, the breakdown of the Stokes–Einstein equation in the deeply undercooled melt is observed, where the diffusivity is related to viscosity by <i>D </i>∝ <i>η</i><sup>−0.865</sup>.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>\n","PeriodicalId":16306,"journal":{"name":"Journal of Materials Research","volume":"127 1","pages":""},"PeriodicalIF":2.7000,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Glass transition and crystallization of Ce68Al10Cu20Co2 bulk metallic glass studied by Flash DSC\",\"authors\":\"Zikang Wei, Chenhui Wang, Luojia Zhang, Jintao Luo, Yulai Gao, Bingge Zhao\",\"doi\":\"10.1557/s43578-024-01339-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>In this study, glass transition and crystallization of Ce<sub>68</sub>Al<sub>10</sub>Cu<sub>20</sub>Co<sub>2</sub> bulk metallic glass at heating rates ranging from 0.083 to 14,000 K/s, covering six orders of magnitude, are investigated. For the glass transition, two linear regions with different apparent activation energies (<i>E</i><sub>a,g</sub>) are distinguished by a critical heating rate of 2000 K/s: <i>E</i><sub>a,g</sub> decreases from 208.7 to 67.3 kJ/mol with the increase of heating rate. During the crystallization, the nucleation rate and crystal growth rate between <i>T</i><sub>g</sub> and <i>T</i><sub>m</sub> are calculated. According to their dependence on temperature, the contact angle for the nucleation of Ce crystals is estimated at 11–14 degrees. For the crystal growth, a maximum crystal growth rate of 0.03 m/s is found at 0.97 <i>T</i><sub>m</sub>. Moreover, the breakdown of the Stokes–Einstein equation in the deeply undercooled melt is observed, where the diffusivity is related to viscosity by <i>D </i>∝ <i>η</i><sup>−0.865</sup>.</p><h3 data-test=\\\"abstract-sub-heading\\\">Graphic abstract</h3>\\n\",\"PeriodicalId\":16306,\"journal\":{\"name\":\"Journal of Materials Research\",\"volume\":\"127 1\",\"pages\":\"\"},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-04-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Research\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1557/s43578-024-01339-z\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Research","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1557/s43578-024-01339-z","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Glass transition and crystallization of Ce68Al10Cu20Co2 bulk metallic glass studied by Flash DSC
In this study, glass transition and crystallization of Ce68Al10Cu20Co2 bulk metallic glass at heating rates ranging from 0.083 to 14,000 K/s, covering six orders of magnitude, are investigated. For the glass transition, two linear regions with different apparent activation energies (Ea,g) are distinguished by a critical heating rate of 2000 K/s: Ea,g decreases from 208.7 to 67.3 kJ/mol with the increase of heating rate. During the crystallization, the nucleation rate and crystal growth rate between Tg and Tm are calculated. According to their dependence on temperature, the contact angle for the nucleation of Ce crystals is estimated at 11–14 degrees. For the crystal growth, a maximum crystal growth rate of 0.03 m/s is found at 0.97 Tm. Moreover, the breakdown of the Stokes–Einstein equation in the deeply undercooled melt is observed, where the diffusivity is related to viscosity by D ∝ η−0.865.
期刊介绍：
Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome.
• Novel materials discovery
• Electronic, photonic and magnetic materials
• Energy Conversion and storage materials
• New thermal and structural materials
• Soft materials
• Biomaterials and related topics
• Nanoscale science and technology
• Advances in materials characterization methods and techniques
• Computational materials science, modeling and theory
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