Energy dissipation by grain boundary replacement during grain growth
Energy dissipation by grain boundary replacement during grain growth
复制标题
晶粒生长过程中晶界置换引起的能量耗散
DOI：
10.1016/j.scriptamat.2023.115405
复制
发表时间：
2023
影响因子：
6
通讯作者：
Rohrer, Gregory S.
中科院分区：
文献类型：
--
作者：
Xu, Zipeng;Hefferan, Christopher M.;Li, Shiu Fai;Lind, Jonathan;Suter, Robert M.;Abdeljawad, Fadi;Rohrer, Gregory S.
在晶粒生长过程中发生的晶界面积和晶界能的变化已被测量在多晶镍使用高能衍射显微镜。除了晶界面积的减少外，平均晶界能也随着高能晶界被低能晶界所取代而降低。这种能量耗散机制影响晶界迁移，并可能解释晶界曲率和迁移速度之间的相关性的情况下，各向同性晶粒生长的多晶体的经典研究一直基于这样的想法，即晶界（GB）迁移是由GB能量和曲率的产品驱动。[1，2]虽然在双晶体[3]和模拟[4]的研究中肯定发现了对这一基本概念的支持，但最近的实验证据与这一想法相矛盾。当测量的曲率和速度在Ni [5]和SrTiO 3 [6]中进行比较时，发现它们不相关。对α-Fe也有类似的观察报告，[7]其中测量的曲率和速度之间的比例常数并没有以预期的方式表现。这封信的目的是提出证据表明，在晶粒生长过程中，较低的能量边界取代较高的能量GB消耗能量的机制，是不相关的曲率。平均GB能量的这种降低表示晶粒生长的额外驱动力。对于由面积为aai的N个三角形网格单元组成的GB网络，总自由能（F）为：
The changes in both the grain boundary area and grain boundary energy that occur during grain growth have been measured in polycrystalline Ni using high energy diffraction microscopy. In addition to the reduction of grain boundary area, the average grain boundary energy decreases as higher energy grain boundaries are replaced by lower energy grain boundaries. This energy dissipation mechanism influences grain boundary migration and might explain the absence of a correlation between grain boundary curvature and migration velocity.Classical studies of isotropic grain growth in polycrystals have been based on the idea that grain boundary (GB) migration is driven by the product of the GB energy and curvature. [1,2] While support for this foundational concept is certainly found in studies of bicrystals [3] and simulations [4], recent experimental evidence contradicts this idea. When measured curvatures and velocities were compared in Ni [5] and SrTiO3, [6] they were found to be uncorrelated. Similar observations were reported for α-Fe, [7] where the measured constant of proportionality between curvature and velocity did not behave in expected ways. The purpose of this letter is to present evidence that, during grain growth, the replacement of higher energy GBs by lower energy boundaries dissipates energy by a mechanism that is not related to curvature. This reduction of the average GB energy represents an additional driving force for grain growth.For a GB network comprised of N triangular mesh elements of areaai, the total free energy (F) is:
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DOI：
10.1016/0001-6160(89)90138-7
发表时间：
1989-08-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
HSIEH, TE;BALLUFFI, RW
通讯作者：
BALLUFFI, RW
DOI：
--
发表时间：
1964
期刊：
影响因子：
--
作者：
C. Smith
通讯作者：
C. Smith
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
P. Goodhew;T. Tan;R. Balluffi
通讯作者：
R. Balluffi
晶粒生长过程中各向异性晶界特性对晶界面分布的影响
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
J. Gruber;D. George;A. Kuprat;G. Rohrer;A. Rollett
通讯作者：
A. Rollett
多晶材料中各向异性晶界特征分布的起源模型
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
G. Rohrer;J. Gruber;A. Rollett
通讯作者：
A. Rollett