Mechanism of steady-state grain growth in aluminum
Mechanism of steady-state grain growth in aluminum
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DOI：
10.1007/bf02644109
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发表时间：
1974-02
期刊：
影响因子：
--
通讯作者：
F. N. Rhines;K. Craig;R. Dehoff
中科院分区：
文献类型：
--
作者：
F. N. Rhines;K. Craig;R. Dehoff
晶粒生长，定义为平均晶粒体积的增加，被发现，在其稳定状态下，是成正比的等温退火的时间。在稳态晶粒生长过程中，晶粒角均为四重点，棱均为三线，角、面、棱之比为6：7：12。稳态晶粒生长的速率常数被证明是可计算的第一原理和性能，可以独立测量的生长观察。它是四个独立常数的乘积，即：1）表征任何材料中稳态晶粒生长的无量纲拓扑常数ε，2）特定材料中平均晶界的迁移率ε，3）特定材料中平均晶界的表面张力y，以及4）无量纲结构常数σ，表示在材料的特定试样中获得的晶粒形式阵列中的晶界表面的曲率，并且可以通过金相法确定。拓扑结构的变化，构成稳定状态的增长被证明存在作为一个简单的事件的逻辑序列。
Grain growth, defined as the increase in volume of the average grain, is found, in its steadystate, to be directly proportional to the time of isothermal annealing. During steady-state grain growth the grain corners are found all to be quadruple points, the grain edges all triple lines and the ratio of corners to faces to edges to be 6:7:12. The rate constant for steady-state grain growth is shown to be calculable from first principles and from properties that can be measured independently of the growth observation. It is the product of four individual constants, namely: 1) a dimensionless topological constant ⊝ that is characteristic of steady-state grain growth in any material, 2) the mobility ώ of the average grain boundary in the specific material, 3) the surface tension y of the average grain boundary in the specific material and 4) a dimensionless structural constant σ which expresses the curvature of surface of the grain boundary in the array of grain forms obtaining in the specific specimen of the material and which can be determined metallographically. The topological changes that constitute steady-state growth are shown to exist as a logical sequence of simple events.