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Microstructure,mechanical properties and corrosion resistance of as-cast and as-extruded Mg-4Zn-1La magnesium alloy

Rare Metals 2020年第8期39卷 909-917页

作者： Huseyin Zengin Yunus Turen Hayrettin Ahlatci yavuz sun Department of Metallurgy and Materials Engineering Karabuk University78050 KarabukTurkey Iron and Steel Institute Karabuk University78050 KarabukTurkey

Microstructure,mechanical properties and corrosion resistance of as-cast and as-extruded Mg-4 wt%Zn-1 wt%La magnesium alloys were *** alloys were produced by low-pressure die casting method and extruded at 350℃after homogenization at 400℃for 24 *** results show that the as-cast alloy mainly consists of primaryα-Mg matrix and Mg-Zn-La ternary second phases(also called T-Phase)along grain boundaries and isolated spherical particles inside the *** extrusion at350℃,the average grain size decreases by 81%due to dynamic recrystallization mechanism and T-phase particles are distributed along the extrusion *** elongation,yield strength and tensile strength of the as-cast Mg-4Zn-1La alloy increase by 179%,90%and 40%,respectively,as a result of the extrusion *** as-extruded Mg-4Zn-1La alloy shows better corrosion resistance than the as-cast alloy due to increased grain boundaries and decreased content of T-phase.

关键词： Magnesium alloys La modification Extrusion Microstructure Mechanical properties Corrosion

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Production of 316L stainless steel implant materials by powder metallurgy and investigation of their wear properties

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Chinese Science Bulletin 2012年第15期57卷 1873-1878页

作者： KURGAN Naci sun yavuz CICEK Bunyamin AHLATCI Hayrettin Engineering Faculty Karabuk University

In this study,the mechanical and wear properties of AISI 316L stainless steel implant materials,produced by powder metallurgy(P/M),were *** 316L stainless steel powder was cold-pressed with 800 MPa of pressure and then sintered at 1200,1250 and 1300°C for 30 min as three sample *** microstructure,and mechanical and wear properties of the resulting steels were *** optical and scanning electron microscopiese were used to characterize the microstructure of the *** temperature mechanical properties of the steels were determined by hardness measurements and impact *** was determined using the pin-on-disc wear test,and the results were evaluated according to weight *** results indicate that the sintering temperature,time and atmosphere are important parameters that affect the porous ratio of materials produced by P/*** at high temperature can eliminate small pores and make the residual pores *** wear tests showed that the wear of the AISI 316L stainless steel implants changed depending on the sintering temperature and *** pores in the samples increase the wear ***,decreasing the porosity ratio of these materials improves all of their mechanical properties.

关键词： 316L不锈钢磨损性能粉末冶金法植入材料冶金生产植入物机械性能烧结温度

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Influence of Sn addition on microstructure and corrosion resistance of AS21 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2019年第7期29卷 1413-1423页

作者： Huseyin ZENGIN Yunus TUREN Hayrettin AHLATCI yavuz sun Abdullah Cahit KARAOGLANLI Department of Metallurgical and Materials Engineering Karabuk University Turkey Department of Metallurgical and Materials Engineering Bartιn University Turkey

This study aims to investigate the influence of Sn addition on microstructure and corrosion properties of AS21 magnesium alloys. The AS21 alloys with 0, 0.5, 1 and 2 wt.% Sn additions were produced by low pressure die casting method. Microstructure characterizations were performed by optical and scanning electron microscopy. Corrosion properties of the alloys were examined by immersion and electrochemical corrosion tests in 3.5% NaCl solution. The microscopic results showed that AS21 alloy consisted of α-Mg, isolated β-Mg17Al12 and Chinese script type Mg2Si intermetallic phases. With increasing amount of Sn, the distribution of Mg2Si phase became more discrete and denser. After 2 wt.% Sn addition, a Sn-rich network structure formed throughout the microstructure and islands of Chinese script shape were made of shorter rods of Mg2Si phase. The constant immersion corrosion tests revealed that increasing Sn addition led to a continual decrease in the degradation of AS21 alloys, in which the corrosion rate of AS21 alloy was decreased by approximately 65% with 2 wt.% Sn addition. The electrochemical corrosion tests also showed that the corrosion resistance of AS21 alloy was gradually improved with increasing Sn content.

关键词： AS21 magnesium alloy Sn addition microstructure corrosion

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Comparison of Solar Trackers and Application of a Sensor Less Dual Axis Solar Tracker

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Journal of Energy and Power Engineering 2015年第6期9卷 556-561页

作者： Ceyda Aksoy Tirmikci Cenk yavuz Electrical and Electronics Engineering Department Engineering Faculty Sakarya University Sakarya 54187 Turkey

In the 21th century, one of the biggest problems that the world faces is energy provision. Today, the way that most countries use for energy production is not clean and continuous. The most obvious proof for that is the change in the climate. The amount of CO2 （carbon dioxide） that is caused by fossil fuel burning increases day by day and this situation creates the greenhouse effect and change in the climate. The sun is one of the best solutions to this problem. It is not only clean and continuous, but also available anywhere, anytime. However, the efficiency of a photovoltaic system is directly related to the amount of solar energy acquired by the system which means that, it is necessary to follow the sun to have a high efficient system. There are two types of trackers that follow the sun and there are several ways to build them. In this paper, solar tracker designs are examined and a new dual axis solar tracker design is given.

关键词： Solar energy sensorless solar tracker solar math linear actuators efficiency low cost.

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