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Effect of hypoeutectic boron modification on the dynamic properties of Ti-6Al-4V alloy

Published online by Cambridge University Press:  04 July 2016

Aashranth Bommakanti ,
Shibayan Roy  and
Satyam Suwas
Aashranth Bommakanti
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Shibayan Roy*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India; and Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India
Satyam Suwas
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of boron on the room-temperature dynamic properties of Ti-6Al-4V alloy with and without boron addition in as-cast and β-forged conditions is studied by varying number of loading cycles, frequency of loading, and strain amplitude. Boron addition seems to lower the complex modulus and increases the damping of the base Ti-6Al-4V alloy. TiB precipitates in boron modified alloys play a key role in improving the damping through dislocation pinning (at all frequencies) and grain boundary pinning (at high frequencies). These effects are more prominent after β-forging wherein arrangement of TiB particles is found to be a deciding factor. Strain amplitude variation of damping shows trend reversal between 10 and 87 Hz frequencies; damping increases with strain amplitude at 10 Hz but reduces with strain amplitude at 87 Hz. A damping peak occurs near the 50 Hz frequency, and cycling through this range results in a significant improvement in damping (21% for as-cast and 93% for β-forged alloys).

Keywords

Ti-6Al-4Vboron additiondynamic mechanical analysisthermo–elastic damping (Zener model)dislocation damping (Granato–Lucke model)
Type
Focus Section: Reinventing Boron Chemistry and Materials for the 21st Century
Information
Journal of Materials Research , Volume 31 , Issue 18: Focus Section: Reinventing Boron Chemistry for the 21st Century , 28 September 2016 , pp. 2804 - 2816
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Copyright
Copyright © Materials Research Society 2016 

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