[Kovove materialy - Metallic materials]
    Tue - May 21, 2019 - 11:07 No. of hits : 1019392 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 51 (2013), Issue 3

Formation of nano-sized grains in Ti-10Zr-5Nb-5Ta biomedical alloy processed by accumulative roll bonding (ARB)
vol. 51 (2013), no. 3, pp. 165 - 172

Formation of nano-sized grains in a new Ti-10Zr-5Nb-5Ta (wt.%) alloy without cytotoxic elements, through innovative accumulative roll bonding (ARB) process was the subject of investigation. The investigations consisted of structural and mechanical characterization of the alloy, processed by 4 ARB cycles at ambient temperatures. The micro-structural investigations were performed before and after each ARB cycle, using a SEM analyzing system, an X-ray diffractometer and a HRTEM analyzing system. The investigations of mechanical properties were based on tensile strength, Young‘s modulus, tensile elongation and micro-hardness measurements. Nano-sized grains were successfully obtained after 4 ARB cycles. The analyzed samples initially showed an ultra fine grain (UFG) structure, transformed during ARB cycles to a nano-sized grain (NG) structure, suitable for improving the alloy’s bioactivity. Consequently, the ARB process increases the strength of the samples: the values of tensile strength drastically increase in the initial stage of the ARB process, after which they tend to become saturated; the Young´s modulus constantly increases; the tensile elongation greatly decreases after 2 ARB cycles; the micro-Vickers hardness values are constantly high during ARB process.

Key words
Ti-Zr-Nb-Ta alloy, grain refining, accumulative roll bonding, structure characterization, mechanical properties testing, nano-crystalline structure

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

Article abstracts updated: 2019-05-07 08:10      
Articles in press revised: 2019-05-21 09:57     
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