Inclination dependence of grain boundary energy and its impact on the faceting and kinetics of tilt grain boundaries in aluminum

被引：65

作者：

Kirch, D. M. ^{[1
]}

Jannot, E. ^{[1
]}

Barrales-Mora, L. A. ^{[1
]}

Molodov, D. A. ^{[1
]}

Gottstein, G. ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Phys Met & Met Phys, D-52056 Aachen, Germany

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 18期

关键词：

Grain boundary energy; Grain boundary motion; Inclination; Faceting;

D O I：

10.1016/j.actamat.2008.06.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The shape evolution and migration of < 100 > and < 111 > tilt grain boundaries with rotation angles theta in the range between 6 degrees and 24 degrees were investigated in situ in a scanning electron microscope at elevated temperatures. The results revealed that boundaries with misorientation theta < 15 degrees did not attain a continuously curved shape in the entire temperature range up to the melting point and, thus, did not move under a capillary driving force. Instead, they remained straight or formed several facets which were inclined to the initial boundary orientation. Molecular statics simulations suggest that the observed behavior of low-angle boundaries is due to the anisotropy of grain boundary energy with respect to boundary inclination. This anisotropy diminishes with increasing misorientation angle, and high-angle boundaries assume a continuously curved shape and move steadily under the curvature driving force. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4998 / 5011

页数：14

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