Andreia Sommerfeld
,
Bernd Bö
,
ttger
,
Babette Tonn
材料科学技术（英文）
Microstructure strongly influences the mechanical properties of cast iron. By inoculating the melt with proper inoculants, foreign substrates are brought into the melt and eventually the graphite can crystallize on them. The elements and substrates that really play a role for nucleation are yet unknown. Until now there is very little knowledge about the fundamentals of nucleation, such as composition and morphology of nuclei[1,2]. In this work we utilized EN-GJL-200 as a base material and examined several produced specimens. The specimens were cast with and without inoculants and quenched at different solidification states. Specimens were also examined with a high and low oxygen concentration, but the results showed that different oxygen contents have no influence on the nucleation in cast iron melts. Our research was focused on the microscopic examination and phase-field simulations. For studying the samples we applied different analytical methods, where SEM-EDS, -WDS were proved to be most effective. The simulations were conducted by using the software MICRESS®[3], which is based on a multiphase-field model and has been coupled directly to the TCFE3 thermodynamic database from TCAB. On the basis of the experimental investigations a nucleation mechanism is proposed, which claims MnS precipitates as the preferred site for graphite nucleation. This theory is supported by the results of the phase-field simulations.
关键词:
Graphite nucleation
,
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,
null
,
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张丽
,
蒋昌忠
,
任峰
,
石瑛
,
付强
功能材料
采用MEVVA源(metal vapor vacuum arcion source)引出的强束流脉冲Ag离子注入到SiO2玻璃,通过电镜观察和分析纳米颗粒的形貌和结构,从电镜照片可知样品中形成了大致呈球形的Ag纳米颗粒.将样品在氧化(空气)和还原(80%N2+20%H2)气氛下退火,由所测光谱曲线看出随着退火温度的升高,共振吸收峰的峰强渐渐减弱,峰位发生红移.根据Drude-Sommerfeld自由电子气模型,并考虑电子带间转换对介电函数的贡献,运用Maxwell-Granett有效媒质理论模拟吸收率与入射波之间的关系.
关键词:
离子注入
,
纳米颗粒
,
退火
,
光学吸收
