Kinetics of microstructure evolution in nanocrystalline Fe powder during mechanical attrition

被引：59

作者：

Tian, HH

Atzmon, M ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

来源：

ACTA MATERIALIA | 1999年 / 47卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S1359-6454(99)00002-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure evolution in Fe powder during ball milling at different temperatures and intensities is investigated. Steady-state grain sizes below 12 nm are obtained, which increase weakly with decreasing milling intensity or increasing temperature. A phenomenological model is proposed, based on the assumption of simultaneous grain refinement and grain growth. This model fits well all data sets. The weak temperature dependence of the grain-growth term is consistent with nonequilibrium vacancy production. The fit results indicate that the efficiency for refinement and vacancy production decreases with increasing vibration amplitude. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：1255 / 1261

页数：7

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[21] THEORY OF IMPURITY CONTROLLED GRAIN BOUNDARY MOTION [J].