Elastic and Anelastic Properties of Molten Iron and Iron Alloys: Applications to the Earth's Core

铁水和铁合金的弹性和滞弹性特性：在地核中的应用

• 批准号: 8917531
• 负责人: Murli Manghnani
• 金额: $ 16.9万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-15 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917531&HistoricalAwards=false
• 关键词: Elastic; Anelastic; Properties; Molten; Iron

The PIs will investigate the elastic wave velocity, Vp, and attenuation, Qp-1, in pure melts of Fe and Fe-Ni-S alloys which are relevant to the outer core of the earth. By using the ultrasonic interferometric technique, the temperature, compositional and frequency dependences of Vp-1 will be determined in the frequency range from 3 to 20 MHz and in the temperature range from 988oC to 1650oC. Bulk modulus and viscosity will also be calculated. By characterizing any relaxation mechanisms, the results should prove very valuable criteria with which to interpret existing shock-wave elasticity data on pure Fe. In addition, these results will be analysed from the point of view of liquid structure. The static structure factor will be calculated and compared to previous experimental and theoretical values. The influence of parent solid structure on liquid structure will be investigated and interpreted in terms of its geophysical significance.

PI 将研究与地球外核相关的 Fe 和 Fe-Ni-S 合金纯熔体中的弹性波速度 Vp 和衰减 Qp-1。 通过使用超声波干涉技术，将在3至20 MHz的频率范围和988oC至1650oC的温度范围内确定Vp-1的温度、成分和频率依赖性。 体积模量和粘度也将被计算。 通过表征任何弛豫机制，结果应该证明非常有价值的标准，可以用来解释现有的纯铁冲击波弹性数据。 此外，这些结果将从液体结构的角度进行分析。 将计算静态结构系数并与之前的实验值和理论值进行比较。 母体固体结构对液体结构的影响将根据其地球物理意义进行研究和解释。