Institute of Materials Physics, Graz University of Technology, A-8010 Graz, Austria.
Phys Rev Lett. 2012 Feb 3;108(5):055504. doi: 10.1103/PhysRevLett.108.055504. Epub 2012 Jan 31.
The grain boundary excess volume, i.e., the grain boundary expansion, e{GB}, was experimentally determined for high-angle grain boundaries in nickel using the direct technique of high-precision difference dilatometry. Values of e{GB}=(0.35±0.04)×10{-10} m and e{GB}=(0.32±0.04)×10{-10} m were obtained by measuring the removal of grain boundary volume upon grain growth for two different types of ultrafine-grained samples. The results are discussed in comparison to values obtained so far from indirect techniques and from computer simulations. It demonstrates the strength of the presented novel, direct approach for grain boundary expansion measurements.
使用高精度差示膨胀法的直接技术，实验确定了镍中高角度晶界的晶界过剩体积，即晶界膨胀 e{GB}。通过测量两种不同类型的超细晶样品在晶粒长大过程中晶界体积的去除，得到 e{GB}=(0.35±0.04)×10{-10} m 和 e{GB}=(0.32±0.04)×10{-10} m。将结果与迄今为止从间接技术和计算机模拟获得的值进行了讨论。它展示了所提出的用于测量晶界膨胀的新颖直接方法的优势。
