Effects of Boron Addition on Grain Refinement in TiAl-based Alloys

被引：44

作者：

Wang, W. D. ^{[1
]}

Ma, Y. C. ^{[1
]}

Chen, B. ^{[1
]}

Gao, M. ^{[1
]}

Liu, K. ^{[1
]}

Li, Y. Y. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2010年 / 26卷 / 07期

关键词：

Titanium aluminides; Phase transformation; Microstructure; PHASE-TRANSFORMATION; TITANIUM; MICROSTRUCTURE;

D O I：

10.1016/S1005-0302(10)60099-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Solid state phase transformation characteristics of the body centred beta(Ti) into the hexagonal closed packed alpha(Ti) in Ti45Al8Nb-(0, 0.3, 0.5 and 0.8 at. pct) B alloys were investigated by heat treatment to clarify gamma/alpha(2) lamellar microstructure refinement induced by B addition. Experimental results confirmed two kinds of boron-reduced grain refinement mechanisms through refining either beta phase then alpha phase (beta-refinement) or alpha phase directly (alpha-refinement) to refine lamellar microstructure at room temperature; however, the role of alpha-refinement dominated the as-cast lamellar microstructure refinement over beta-refinement in Ti45Al8NbxB alloy. It was also found that during the alpha-refinement the convoluted flake- and plate-like borides along beta grain boundaries assisted nucleation of alpha phase, and the particle-like borides near beta grain boundaries impeded alpha phase growth.

引用

页码：639 / 647

页数：9

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