Influence of equiatomic Zr/Nb substitution on superelastic behavior of Ti-Nb-Zr alloy

被引：94
|
作者：
Zhang, Jinyong [1 ]
Sun, Fan [1 ]
Hao, Yulin [2 ]
Gozdecki, Nicolas [1 ]
Lebrun, Emilie [1 ]
Vermaut, Philippe [1 ]
Portier, Richard [1 ]
Gloriant, Thierry [3 ]
Laheurte, Pascal [4 ]
Prima, Frederic [1 ]
机构：
[1] ENSCP, UMR 7045, Grp Met Struct, Lab Physicochim Surfaces, F-75231 Paris 05, France
[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[3] UMR CNRS 6226 Sci Chim Rennes Chim Met, Inst Sci Chim Rennes, F-35043 Rennes, France
[4] Univ Metz, Lab UMR CNRS 7239 LEM3, Metz, France
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 563卷
关键词：
Microstructure characterization; Mechanical properties; Superelasticity; Metastable beta titanium alloys; Equiatomic substitution; ELASTIC-DEFORMATION-BEHAVIOR; SHAPE-MEMORY; BIOMEDICAL APPLICATIONS; PHASE-STABILITY; TITANIUM-ALLOY; MO ALLOYS; MARTENSITIC-TRANSFORMATION; MECHANICAL-PROPERTIES; MICROSTRUCTURE; MODULUS;
D O I：
10.1016/j.msea.2012.11.045
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Based on a binary Ti-26Nb (at%) alloy, Ti-(26-z)at% Nb-(z)at% Zr (z=2, 6, 8 and 10) alloys via equiatomic substitution of Nb by Zr are formulated. Influence of equiatomic Zr/Nb substitution on microstructure evolution, mechanical properties and deformation mechanism of the superelastic Ti-Nb-Zr alloy are investigated. Experimental results show that the phase constitution is single beta phase or beta/omega(ath) phase at 0 < Zr/Nb < 0.35 since the measured Ms temperature is maintained at around 250 K. The two-phase microstructure consist of alpha '' martensite and beta phase is obtained at Zr/Nb ratio > 0.4 due to the attenuation of beta stabilizing effect of Zr, which is related closely to the Nb content in ternary Ti-Nb-Zr alloys. The mechanism of the superelastic behavior alters gradually from reversible beta/alpha '' martensitic transformation to rearrangement of pre-existing alpha '' martensites as a function of Zr/Nb ratio increase. At Zr/Nb=0.3, the alloy of corresponding composition exhibits the best superelasticity and combined mechanical performance. A coefficient of Delta T (Delta T=T-beta-Ms) is proposed to understand the experimental results by evaluating the beta instability of Ti-Nb-Zr alloys. (c) 2012 Elsevier B.V. All rights reserved.
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页码：78 / 85
页数：8
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