Investigation of Ti-6Al-4V alloy acoustic softening

•Tensile properties of Ti-6Al-4V under superimposed high power ultrasonic are investigated.•Yield stress reduction up to 9.52% due to acoustic softening is observed.•Ultimate strength reduction up to 4.55% is observed.•The elongation of Ti-6Al-4V is improved up to 13% by the high power ultrasonic.•A...

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Bibliographic Details
Published in:Ultrasonics sonochemistry 2017-09, Vol.38, p.744-749
Main Authors: Fartashvand, V., Abdullah, A., Sadough Vanini, S.A.
Format: Article
Language:English
Subjects:
Acoustic softening
Longitudinal vibration
Mechanical property
Ti-6Al-4V alloy
Ultrasonic vibration
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Summary:•Tensile properties of Ti-6Al-4V under superimposed high power ultrasonic are investigated.•Yield stress reduction up to 9.52% due to acoustic softening is observed.•Ultimate strength reduction up to 4.55% is observed.•The elongation of Ti-6Al-4V is improved up to 13% by the high power ultrasonic.•Acoustic hardening effect is not observed. High power ultrasonic vibration is widely used for improving manufacturing processes such as machining and metal forming. High frequency mechanical vibration affects material properties and friction forces in contacting surfaces. Flow stress reduction under superimposed ultrasonic vibration is called as acoustic softening. The amount of this parameter should be determined for ultrasonic assisted metal forming processes. For determination of this parameter for workhorse Ti-6Al-4V alloy, experimental setup was designed and fabricated. Then tensile test under longitudinal ultrasonic vibration was performed for different ultrasonic powers. Results show that ultrasonic vibration has considerable effect on plastic behavior of the alloy and decreases flow stress. Also, increasing ultrasonic power leads to higher acoustic softening. Yield stress reduction up to 9.52%, ultimate stress reduction up to 4.55% and elongation up to 13% were obtained at 340W ultrasonic power. After applying ultrasonic vibrations and its termination, hardness of specimens were measured in which increase up to 9% was observed.
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2016.07.007