Effect of boron on microstructure and mechanical properties of multicomponent titanium alloys

被引：23
作者：
Okulov, I. V. [1 ,2 ]
Sarmanova, My. [3 ]
Volegov, A. S. [1 ,4 ]
Okulov, A. [5 ]
Kuehn, U. [1 ]
Skrotzki, W. [6 ]
Eckert, J. [1 ,2 ]
机构：
[1] IFW Dresden, Inst Komplexe Mat, D-01069 Dresden, Germany
[2] Tech Univ Dresden, Inst Werkstoffwissenschaft, D-01062 Dresden, Germany
[3] Leibniz Inst Oberflachenmodifizierung, D-04318 Leipzig, Germany
[4] Ural Fed Univ, Inst Nat Sci, Ekaterinburg 620000, Russia
[5] Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia
[6] Tech Univ Dresden, Inst Strukturphys, D-01062 Dresden, Germany
来源：
MATERIALS LETTERS | 2015年 / 158卷
关键词：
Titanium alloys; Microstructure; Boron refinement; Electron microscopy; Mechanical properties; GRAIN-REFINEMENT; COMPOSITE;
D O I：
10.1016/j.matlet.2015.06.017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Boron refinement is an established method to refine the grain structure of titanium alloys. The effect of boron on microstructure of multicomponent Ti-Nb-Cu-Co-Al-B alloys was studied. These as-cast alloys exhibit a composite-like microstructure consisting of about 92 vol% of beta-Ti dendrites surrounded by an ultrafine-structured eutectic composed of beta-Ti and B2 TiCo. It was found that significant additions (up to 1 at%) of boron do not result in a pronounced refinement of microstructure in these alloys. However, noticeable strengthening and stiffening effects are observed for the alloys with increasing boron concentration. In particular, the yield strength of Ti-13.6Nb-6Co-5.1Cu-6.5Al (at%) improves from 1110 +/- 30 MPa to 1200 +/- 30 MPa with addition of 1 at% of boron. Additionally, increasing boron content affects the morphology of the eutectic structure causing its degradation. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：111 / 114
页数：4
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