Twinning-related grain boundary engineering

被引：666

作者：

Randle, V ^{[1
]}

机构：

[1] Univ Coll Swansea, Sch Engn, Mat Res Ctr, Swansea SA2 8PP, W Glam, Wales

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 14期

关键词：

coincidence lattice; interfaces; twinning; mechanical properties; grain boundary engineering;

D O I：

10.1016/j.actamat.2004.05.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This overview reports the fundamental concepts of grain boundary engineering (GBE) accompanied by a critical appraisal of GBE investigations. The main conclusions are as follows. There are many variants on processing route schedules to produce successfully a GBE microstructure with improved properties. The role of twinning is indirect and twins have several functions at different stages of the GBE process, which are necessary for the development of microstructure and properties: firstly to retain strain, then to generate non-coherent Sigma3s (and other 'special' boundaries), and finally to break up the random boundary network. Connectivity of boundary types is more important than the absolute fraction of special boundaries. The 'strain recrystallisation' description of GBE processing is in fact a recovery process. Accordingly, strain-recrystallisation and strain-anneal GBE do not involve separate mechanisms. The CSL model has ambiguities with regard to recognition of special boundaries. Finally, near-future challenges for GBE are identified. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4067 / 4081

页数：15

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