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Investigation of microstructure and mechanical properties of the Cu–3% Ti alloy processed by multiaxial cryo-forging

Published online by Cambridge University Press:  07 August 2018

Ramesh Sampath ,
Hanumanthappa Shivananda Nayaka ,
Karekere Rangaraju Gopi ,
Sandeep Sahu  and
Udaya Bhat Kuruveri
Ramesh Sampath*
Affiliation:
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
Hanumanthappa Shivananda Nayaka
Affiliation:
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
Karekere Rangaraju Gopi
Affiliation:
Department of Mechanical Engineering, Rajeev Institute of Technology, Hassan 573201, India
Sandeep Sahu
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
Udaya Bhat Kuruveri*
Affiliation:
Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
*
a)Address all correspondence to this author. e-mail: ramnitk2016@gmail.com
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Abstract

A Cu–3%Ti (wt%) alloy was processed by multiaxial forging (MAF) at cryogenic temperature up to 3 cycles, imposing a total strain of 1.6. Microstructure and mechanical properties of the unprocessed and cryo-forged samples were analyzed. X-ray diffraction results showed deviation in peak broadening and peak intensity of the cryo-forged samples in comparison to that of unprocessed, which are due to texture modification caused by grain refinement during the MAF process. Microstructural analysis showed reduction in grain size from 80 µm in the as-received condition to 250 nm after 3 cycles. Electron backscatter diffraction results indicated the transformation of high angle grain boundaries to low angle grain boundaries in all 3 cycles when compared to the as-received condition. Reduction in ductility was observed after 1 cycle, but with an increase in the number of cycles, both strength and ductility increased. After 3 cycles, ultimate tensile strength and hardness reached 1126 MPa and 427 Hv as compared to 528 MPa and 224 Hv for the as-received condition. Fractography analysis showed decrement in dimple size after 1 cycle, in comparison to that of the as-received condition. However, it kept on increasing for higher number of cycles.

Keywords

Cu–Ti alloymultiaxial forgingmicrostructuregrain refinementX-ray diffraction
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3700 - 3710
Copyright
Copyright © Materials Research Society 2018 

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