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The molecular dynamics method was used to simulate thermodynamic properties of three binary alloys: Pb40Au60, Pb80Au20 and Pb90Au10. The energy functions, including excess free energy, cohesive energy and formation energy, were calculated. Formation energy and excess free energy are all negative values, so Pb-Au alloys belong to negative system. The atomic interactions were analyzed in macroscopic and microcosmic views. The calculated formation energy can describe the deviation degree between the actual alloy and the ideal melt quantitatively 相似文献
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Pb-Au合金热力学性质的分子动力学模拟 总被引:1,自引:0,他引:1
使用分子动力学方法模拟Pb40Au60、Pb80Au20和Pb90Au103种合金的热力学性质,计算合金的过剩自由能、结合能和形成能等能量方程。结果显示:合金的形成能和过剩自由能均为正值,因此Pb-Au合金为正偏差体系。从微观和宏观角度分析原子间的相互作用,并且使用形成能定量描述合金与理想熔体的偏离程度。 相似文献
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因其特殊的服役环境,电站锅炉关键材料需要同时满足力学性能与抗高温腐蚀性能的需求。本文从高温蒸汽氧化的角度,讨论了现有锅炉合金及下一代电站合金的高温蒸汽腐蚀研究进展和高温蒸汽氧化机理。 相似文献
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690合金中的相析出规律直接影响着其晶界应力腐蚀抗力。应用Thermo-Calc 软件模拟计算了690合金的成分变化和热处理温度对平衡相析出规律的影响。结果表明:C 含量明显影响 M23C6 的析出规律,而对γ′和α-Cr 相的影响较小;Cr 含量对 M23C6、γ′和α-Cr相的析出规律都有明显影响;Fe含量对相析出规律影响很小。由此得出结论:合金固溶温度应在1050 ℃以上,等温热处理温度应在700 ℃以上。 相似文献
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电站锅炉不锈钢管氧化皮检测技术 总被引:1,自引:0,他引:1
电站锅炉不锈钢管内壁由于蒸汽氧化容易产生氧化皮,剥落的氧化皮会堵塞管道,严重时甚至造成堵塞爆管。为了降低事故,减少损失,开展对电站锅炉不锈钢管氧化皮的检测就极为重要。基于磁性检测技术,提出了不锈钢管氧化皮检测方法,研制了检测仪器,并在现场进行了大量应用。实践表明,该仪器具有携带方便、检测快捷和灵敏度高等优点,可较好地满足电站锅炉不锈钢管氧化皮检测的要求。 相似文献
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According to the quasi-paraboloid rule, a computer program was developed and the Gibbs free energy functions of some compounds in Sialon system were assessed and predicted. It makes the theoretical design of the Sialon materials possible. 相似文献
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1QuasiparaboloidRuleBasedontheprinciplethatthemolarGibbsfreeenergyfunctionistowardsaminimumwhenaphaseisstable,ageneralrela... 相似文献
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高效数控加工实现的途径与措施探讨 总被引:2,自引:1,他引:1
从现阶段企业在数控加工技术应用方面的实际出发,结合作者的实际经验,从产品的生产管理、设计研发与制造模式、工艺的信息化建设、数控加工工艺与程序的编制及管理、数控人才的培养等多个方面,探讨了高效数控加工实现的途径与措施。 相似文献
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Different types of models are used to describe the interdependencies between logistic performance measures of production systems in research and practice. The most widely known analytical models in this field are queuing theory models. Simulation, on the other hand, is a widespread technique for the exploration, design and optimisation of complex production systems. Due to the limitations of queuing and simulation models, a mathematical approximation approach developed at the Institute of Production Systems and Logistics is becoming more relevant: the Logistic Operating Curves. The paper introduces the theory of these three modelling methods and compares as well as differentiates them. 相似文献