Three-dimensional observations of grain volume changes during annealing of polycrystalline Ni

被引：34

作者：

Bhattacharya, Aditi ^{[1
]}

Shen, Yu-Feng ^{[2
]}

Hefferan, Christopher M. ^{[2
,3
]}

Li, Shiu Fai ^{[2
]}

Lind, Jonathan ^{[2
,4
]}

Suter, Robert M. ^{[2
]}

Rohrer, Gregory S. ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA

[2] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[3] RJ Lee Grp, 350 Hochberg Rd, Monroeville, PA 15146 USA

[4] Lawrence Livermore Natl Lab, Mat Engn Div, 7000 East Ave, Livermore, CA 94551 USA

来源：

ACTA MATERIALIA | 2019年 / 167卷

基金：

美国国家科学基金会;

关键词：

DIFFRACTION MICROSCOPY; COMPUTER-SIMULATION; TWIN NUCLEATION; GROWTH; MICROSTRUCTURE; STATISTICS; CONVERSION; CURVATURE; MECHANISM; NICKEL;

D O I：

10.1016/j.actamat.2019.01.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The orientations, locations, and sizes of approximately 2500 grains in a Ni polycrystal were measured at six points in time during an interrupted annealing experiment by synchrotron x-ray based, near field high-energy diffraction microscopy. The volume changes were compared to the geometric characteristics of the grains in both the original microstructures and microstructures in which adjacent twin related domains were merged. Neither the size of a grain nor the number of its nearest neighbors correlates strongly to a grain's volume change over the time scale of this experiment. However, the difference between the number of neighbors a grain has, F, and the average number of neighbors of the neighboring grains have, < F-NN >, is correlated to the volume change. A grain with more (fewer) neighbors than < F-NN > usually grows (shrinks). The correlation between the volume change and F - < F-NN > is obvious only if adjacent twin related domains are merged. The correct sign of the volume change is predicted by F - < F-NN > about two thirds of the time. The results show that the volume change for a given grain is better predicted by comparing a grain's characteristics to its neighbor's characteristics than to the characteristics of the entire ensemble of grains. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：40 / 50

页数：11

共 47 条

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