Design and Characterization of New Ti-Nb-Hf Alloys

被引：22
|
作者：
Gonzalez, M. [1 ]
Pena, J. [1 ,2 ]
Manero, J. M. [1 ]
Arciniegas, M. [1 ]
Gil, F. J. [1 ]
机构：
[1] Univ Politecn Cataluna, Dept Mat Sci & Met, E-08028 Barcelona, Spain
[2] Elisava Escola Super Disseny, Barcelona 08002, Spain
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2009年 / 18卷 / 5-6期
关键词：
low elastic modulus; nanoindentation; Ni-free Ti alloys; shape memory effect; SHAPE-MEMORY; MECHANICAL-PROPERTIES; MODULUS;
D O I：
10.1007/s11665-009-9381-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Three new Ni-free Ti alloys Ti-16.2Hf-24.8Nb-1Zr, Ti-5.2Hf-31.2Nb-0.4Zr, and Ti-16Hf-36.2Nb-1Zr (wt.%), were designed and produced in order to obtain shape memory and/or low elastic modulus materials for the use in the load transfer implant field. For that, a method based on the molecular orbital theory was implemented to design the three new Ti-Nb-Hf system alloys. A vacuum arc-melted button of each alloy was treated at 1100 A degrees C for 1.5 h and quenched in a mixture of ethanol/water at 0 A degrees C. Finally, the alloys were microstructurally and mechanically characterized. Special attention on studying the elastic modulus and the thermoelastic martensitic transformation was given by means of nanoindentation tests using a Berkovich and a spherical tip, respectively. X-ray diffraction results showed the presence of beta-phase in the three studied alloys. Moreover, one of the alloys exhibited reversible phase transformation due to the presence of thermoelastic martensitic alpha''-plates inside the beta-grains observed by transmission electron microscopy. Results showed a low elastic modulus in all the studied alloys with values between 70 and 90 GPa, which are lower than those of the commercial alloys used in load transfer bone implants.
引用
收藏
页码：490 / 495
页数：6
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