Grain growth in nanocrystalline iron prepared by mechanical attrition
Grain growth in nanocrystalline iron prepared by mechanical attrition
复制标题
DOI：
10.1016/s1359-6454(96)00300-x
复制
发表时间：
1997-05-01
期刊：
影响因子：
9.4
通讯作者：
Koch, CC
中科院分区：
文献类型：
--
作者：
Malow, TR;Koch, CC
研究了高能球磨法制备的纳米晶Fe的晶粒长大过程。用两种不同的晶体生长模型分析了晶体生长数据，其中一种模型考虑了晶界上的钉扎力。比较了纳米晶和常规多晶铁的D-L/n-D-o(L/n)=kt的晶粒长大指数n。使用上述方程得到的活化能为125kJ/mol，而第二个模型得到的活化能为248kJ/mol。将这些值与Fe中晶界和晶格扩散的值进行了比较。讨论了纳米晶Fe中两种不同的晶粒生长机制的证据。(C)1997年，Acta Metallurica Inc.
The grain growth in nanocrystalline Fe produced by high energy ball milling is investigated. Grain growth data are analysed using two different models of grain growth, one of which takes pinning forces on the grain boundaries into account. The grain growth exponents n from D-l/n - D-o(l/n) = kt for nanocrystalline and conventional polycrystalline Fe are compared. The use of the above mentioned equation yields an activation energy of 125 kJ/mol, while the second model gives 248 kJ/mol. These Values are compared to those for grain boundary and lattice diffusion in Fe. Some evidence for two different sets of mechanisms governing the grain growth in nanocrystalline Fe are discussed. (C) 1997 Acta Metallurgica Inc.