Impacts of nano-clay particles and heat-treating on out-of-phase thermo-mechanical fatigue characteristics in piston aluminum-silicon alloys

H. Bahmanabadi; Mohammad Azadi; A. Dadashi; J. Torkian; M.S.A. Parast; G. Winter; F. Grün

doi:10.3221/IGF-ESIS.65.15

Authors

H. Bahmanabadi Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Mohammad Azadi Faculty of Mechanical Engineering, Semnan University, Semnan, Iran https://orcid.org/0000-0001-8686-8705
A. Dadashi Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
J. Torkian Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
M.S.A. Parast Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
G. Winter Chair of Mechanical Engineering, Montanuniversität Leoben, Leoben, Austria
F. Grün Chair of Mechanical Engineering, Montanuniversität Leoben, Leoben, Austria

DOI:

https://doi.org/10.3221/IGF-ESIS.65.15

Keywords:

Heat-treating, Nano-clay particles, Thermo-mechanical fatigue, Out-of-phase loading, Piston aluminum-silicon alloy

Abstract

Abstract. In this article, the effect of nano-clay particles and heat-treating on thermo-mechanical fatigue (TMF) behaviors and failures of piston aluminum-silicon (AlSi) alloys was investigated. For this purpose, thermo-mechanical fatigue tests were conducted under out-of-phase (OP) loading conditions. Two loading conditions were checked based on different maximum temperatures (250, 300, and 350 °C) and various thermo-mechanical loading factors (100, 125, and 150%). The minimum temperature was constant in all tests at 50 °C under a heating/cooling rate of 10 °C/s and a dwell time of 5 s. Results showed that the nano-composites had a longer fatigue lifetime, at least 2 times higher, compared to the Al alloy, when the maximum temperature was 250 °C and the thermo-mechanical loading factor was 100%. However, no effective change was seen for the stress value and the plastic strain. At higher maximum temperatures, the change in the material behavior was lower. The fracture analysis by scanning electron microscopy (SEM) demonstrated that both materials had a brittle behavior due to cleavage and quasi-cleavage marks. The damage mechanism was also due to the Si-rich phase and intermetallics, respectively for the crack propagation and the micro-crack initiation.

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Author Biography

Mohammad Azadi, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran

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.