Effects of boron on microstructure in cast titanium alloys

被引：177

作者：

Bermingham, M. J. ^{[1
]}

McDonald, S. D. ^{[1
]}

Nogita, K. ^{[2
]}

John, D. H. St. ^{[1
]}

Dargusch, M. S. ^{[1
]}

机构：

[1] Univ Queensland, Sch Engn, CAST Cooperat Res Ctr, Brisbane, Qld 4072, Australia

[2] Univ Queensland, Div Mat Engn, Brisbane, Qld 4072, Australia

来源：

SCRIPTA MATERIALIA | 2008年 / 59卷 / 05期

关键词：

titanium alloys; microstructure; grain refinement; boron;

D O I：

10.1016/j.scriptamat.2008.05.002

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Trace additions of boron to commercial purity titanium result in significant microstructural changes. Changes include the promotion of dendritic growth and refinement in both the prior-beta and alpha-grain size. Boron partitions strongly on solidification and TiB intermetallics are observed throughout the microstructure, confined to interdendritic regions. This strong partitioning of solute causes prior-beta grain refinement, and the presence of TiB intermetallics and/or the increased beta-grain boundary surface area associated with the change in beta-grain morphology assists nucleation of the alpha-phase. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：538 / 541

页数：4

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