0000-0001-8686-8705
Abstract
The objective of the present paper is to investigate the stress-controlled low-cycle fatigue behavior of piston aluminum-silicon (AlSi) alloy reinforced with nano-clay particles and T6 heat-treatment. The piston aluminum-silicon alloy strengthened by 1 wt.% nano-clay particles were prepared by the stir casting method and then subjected to the heat-treatment. The optical microscopy analysis demonstrates that heat-treatment changed the size, morphology, and distribution of silicon phases through the microstructure of the aluminum matrix. In addition to tensile tests, stress-controlled low-cycle fatigue experiments at different loading conditions including the variation of the mean stress, the stress rate, and the stress amplitude were conducted at room temperature. The obtained experimental results showed no clear improvement in either mechanical or fatigue properties of the material. Moreover, the density measurements using the Archimedes method reveal a higher content of the porosity in nano-composite. It was observed that the reinforcement (nano-particles and heat-treatment) can change the cyclic behavior of the AlSi alloy, significantly. The cyclic hardening feature of the AlSi alloy changed to cyclic softening and also the fatigue lifetime and the ratcheting resistance decreased after the nano-particles addition and heat-treatment. Through the microstructural analysis, it was indicated that the neglecting of higher kinematics of age hardening in nano-composite was the major source of mechanical properties reduction. In the end, it was shown that the fatigue lifetime of samples can be described adequately utilizing a modified plastic strain energy technique considering the mean stress effect.
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- ReceivedUntil the next stage: 20 days
- Revision requestedUntil the next stage: 7 days
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- AcceptedUntil the next stage: 5 days
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About the authors
Mohammad Azadi
Mohammad Azadi was born in Shiraz, Iran in 1983. He received B.Sc. and M.Sc. degrees in mechanical engineering from Shiraz University, Shiraz, Iran and K.N. Toosi University of Technology, Tehran, Iran, respectively, in 2006 and 2008; and then, the Ph.D. degree in mechanical engineering from Sharif University of Technology, Tehran, Iran, in 2013. During his Ph.D., he has awarded an exchange program by the Ministry of Science, Research and Technology and also Irankhodro Powertrain Company, in order to perform a fatigue testing project in University of Leoben, Leoben, Austria, 2012.
From 2008 to 2015, he has worked in Irankhodro Powertrain Company, Tehran, Iran and for last two years, he was a project manager of a national turbo-charged engine. Since 2015, he has been an Assistant Professor in the Faculty of Mechanical Engineering, Semnan University, Semnan, Iran. Now, He is an Associate Professor, since 2019.
He is the author of two chapter-books, two conference proceedings, more than 90 journal articles, about 110 conference papers and 12 patents. He has been also funded to perform 8 research projects by Iranian universities and industries; in addition to one international project, entitled "Iran-Austria Impulse". He is an advisory board of International Journal of Engineering and also a reviewer in different ISI journals, such as International Journal of Fatigue and Materials Science and Engineering A. His research interests include solid mechanics, fatigue, fracture and creep, numerical methods, surface engineering, materials characterization, design of experiments, with the application of engine, aerospace and automotive industries, besides biomechanics. Nowadays, he is working on additive manufacturing to fabricate composites and nano-composites by 3D-printing, in order to evaluate fatigue properties of materials.
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Licence
May be shared and adapted, provided appropriate credit is given. Copyright © 2021 Mohammad Azadi, Adel Basiri, Ali Dadashi, G. Winter, B. Seisenbacher, F. Grün.
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Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.
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