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
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