Formation of a bimodal structure in ultrafine Ti-Fe-Nb alloys with high-strength and enhanced ductility

被引：27
作者：
Cao, G. H. [1 ]
Peng, Y. F. [1 ]
Liu, N. [1 ]
Li, X. [1 ]
Lei, Z. S. [1 ]
Ren, Z. M. [1 ]
Gerthsen, D. [2 ]
Russell, A. M. [3 ,4 ]
机构：
[1] Shanghai Univ, Dept Mat Engn, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China
[2] Karlsruher Inst Technol, Lab Elektronenmikroskopie, D-76128 Karlsruhe, Germany
[3] US DOE, Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA
[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 609卷
基金：
中国国家自然科学基金;
关键词：
Titanium alloys; Nanostructured materials; Eutectics; Mechanical characterization; Plasticity; Electron microscopy; NANOSTRUCTURE-DENDRITE COMPOSITE; MECHANICAL-PROPERTIES; LARGE PLASTICITY; BULK ALLOYS; SN; MICROSTRUCTURE; METALS; PHASE;
D O I：
10.1016/j.msea.2014.04.088
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Bulk (Ti(70.5)Fe29.5)(100-x)Nb-x (x=0, 3, 5 and 7 at%) alloys were prepared by cold crucible levitation melting, and their mechanical properties were tested in compression at room temperature. A (Ti70.5Fe29.5)(97)Nb-3 alloy specimen in compression exhibited an ultimate compressive strength of 2.53 GPa and a compressive plastic strain of 15%. Electron microscope observations indicated that lamellar structures present in the eutectic Ti70.5Fe29.5 alloy could be modified by the addition of Nb to obtain a bimodal structure. The improvement of the mechanical properties is attributed to two factors: (1) the bimodal phase size distribution with micrometer-sized primary beta-Ti dendrites embedded inside a matrix of refined ultrafine eutectics (beta-Ti+TiFe), and (2) the larger lattice mismatches between the beta-Ti and TiFe phases in Nb-modified eutectic Ti-Fe alloys that introduce coherency strain at the interface. The orientation relationship of A2 beta-Ti with B2 TiFe in binary and Nb-modified Ti-Fe alloys is TiFe (110)[001] II beta-Ti (110)[001]. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：60 / 64
页数：5
相关论文
共 26 条
[1]  
[Anonymous], 2000, 2000 ANN BOOK ASTM S
[2]  
[Anonymous], 2001, PCPDFWIN VERS 2 2
[3]   Sn and Nb modified ultrafine Ti-based bulk alloys with high-strength and enhanced ductility [J].
Cao, G. H. ;
Schneider, R. ;
Gerthsen, D. ;
Chulist, R. ;
Schaarschuch, R. ;
Oertel, C. -G. ;
Skrotzki, W. .
APPLIED PHYSICS LETTERS, 2013, 102 (06)
[4]   High-strength Ti-base ultrafine eutectic with enhanced ductility -: art. no. 161907 [J].
Das, J ;
Kim, KB ;
Baier, F ;
Löser, W ;
Eckert, J .
APPLIED PHYSICS LETTERS, 2005, 87 (16) :1-3
[5]   Effect of Sn on microstructure and mechanical properties of Ti-Fe-(Sn) ultrafine eutectic composites [J].
Das, Jayanta ;
Theissmann, Ralf ;
Loser, Wolfgang ;
Eckert, Jurgen .
JOURNAL OF MATERIALS RESEARCH, 2010, 25 (05) :943-956
[6]   Martensitic transformation and metastable β-phase in binary titanium alloys with d-metals of 4-6 periods [J].
Dobromyslov, AV ;
Elkin, VA .
SCRIPTA MATERIALIA, 2001, 44 (06) :905-910
[7]  
Haasen P., 1996, Physical Metallurgy
[8]   Influence of a bimodal eutectic structure on the plasticity of a (Ti70.5Fe29.5)91Sn9 ultrafine composite [J].
Han, J. H. ;
Kim, K. B. ;
Yi, S. ;
Park, J. M. ;
Kim, D. H. ;
Pauly, S. ;
Eckert, J. .
APPLIED PHYSICS LETTERS, 2008, 93 (20)
[9]   Formation of a bimodal eutectic structure in Ti-Fe-Sn alloys with enhanced plasticity [J].
Han, J. H. ;
Kim, K. B. ;
Yi, S. ;
Park, J. M. ;
Sohn, S. W. ;
Kim, T. E. ;
Kim, D. H. ;
Das, J. ;
Eckert, J. .
APPLIED PHYSICS LETTERS, 2008, 93 (14)
[10]   Effect of Sn on microstructure and mechanical properties of Ti-base dendrite/ultrafine-structured multicomponent alloys [J].
He, G ;
Eckert, J ;
Hagiwara, M .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (11) :3605-3612
123