The Effect of Nb on the Recrystallization and Grain Growth of Ultra-High-Purity α-Fe: A Combinatorial Approach
The Effect of Nb on the Recrystallization and Grain Growth of Ultra-High-Purity α-Fe: A Combinatorial Approach
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DOI：
10.1007/s11661-007-9106-9
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
C. Sinclair;C. Hutchinson;Y. Bréchet
中科院分区：
文献类型：
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作者：
C. Sinclair;C. Hutchinson;Y. Bréchet
采用组合方法研究了Nb在固溶体中对超高纯度α-Fe再结晶和晶粒长大条件的影响。它被证明是估计溶质与晶界结合能、跨界溶质扩散率和晶界固有迁移率等参数的有效手段，对于现有溶质阻力理论在合金设计相关问题中的实际应用至关重要。利用温度梯度（RT-850℃）下的Fe-Nb扩散偶（Nb含量在0 ~ 0.095 wt pct之间），利用溶质阻力问题的Cahn解的慢分支，可以定量地推导出再结晶区和非再结晶区之间的边界以及晶粒生长行为作为Nb含量和温度的函数。
A combinatorial approach to the problem of the effect of Nb in solid solution on the conditions for recrystallization and grain growth in ultra-high-purity (UHP)α-Fe is presented. It is shown to be an efficient means for estimating parameters such as the binding energy of solute to grain boundaries, the transboundary solute diffusivity, and the intrinsic mobility of grain boundaries, crucial for practical applications of existing solute drag theories to questions related to alloy design. Using a Fe-Nb diffusion couple (Nb contents ranging from 0 to 0.095 wt pct) transformed within a temperature gradient (RT-850 °C), the boundary between the recrystallized and unrecrystallized regions and the grain growth behavior as a function of Nb content and temperature could be quantitatively rationalized using the slow branch of Cahn’s solution to the solute drag problem.