The Square Root Diffusivity

提出研究的目的是测试理论预测，扩散可以通过合金设计显着减少。这一点很重要，因为高温合金退化的主要因素是原子的快速扩散。使用新的“平方根扩散系数法”对多组分合金的扩散系数进行实验测量，将允许确定最佳成分。所研究的三元合金将以ni - 1ocr - 10oa1的成分为基础，其变化不大，而季元成分将由基本合金组成，并添加少量的Ta， Mo或Hf。

The objective of the proposed research is to test theoretical predictions that diffusion can be reduced significantly by alloy design. This is important because the major factor in the degradation of high-temperature alloys is rapid atomic diffusion. Experimental measurements of diffusivities in multicomponent alloys, using the new "square root diffusivity method", will permit the optimum compositions to be identified. Ternary alloys to be investigated will be based on the composition Ni-1OCr-1OA1 with small variations therefrom, while quaternary compositions will consist of the basic alloy with small additions of Ta, Mo or Hf.