Wetting Properties of Molten Iron Alloy at High-Pressure

9417855该奖项将支持确定压力对铁合金熔体润湿硅酸盐和氧化物晶界的影响的实验。晶体-液体界面的二面角将被测量，以量化晶界润湿和合金熔体连通性。建议的原料是Homestead L5普通球粒陨石。首先将使用活塞-气缸技术进行实验，以确定达到织构平衡的最佳条件，并检查压力在0.5至4 Gpa范围内的影响。调查的第二阶段将尝试将这项工作扩展到多砧座装置中的更高压力。拟议的研究结果将对从球粒陨石地幔中提取岩心的模型施加重要的物理约束。

9417855 Agee This award will support experiments to determine the effect of pressure on the wetting of silicate and oxide grain boundaries by molten iron alloy. dihedral angles of crystal-liquid interfaces will be measured on quenched run products to quantify grain boundary wetting and alloy melt connectivity. The proposed starting material is the Homestead L5 ordinary chondrite. Experiments will first be carried out using piston-cylinder techniques to establish the optimum conditions for achievement of textural equilibrium and to examine the effect of pressure in the 0.5 to 4 GPa range. The second stage of the investigation will attempt to extend the work to higher pressures in a multi-anvil device. The results of the proposed research will place important physical constraints on models for core extraction from chondritic mantle.