Smooth and notched fatigue performance of aging treated and shot peened ZK60 magnesium alloy
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Jie Donga) National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Ping Zhang Physical Metallurgy and Materials Technology, Technical University of Brandenburg at Cottbus, 03046 Cottbus, Germany
Xing-Wei Zheng National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Wen-Jiang Ding National Engineering Research Center of Light Alloy Net Forming, and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
De-Hui Li Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
Alexander M. Korsunsky Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom (Received 13 November 2009; accepted 29 March 2010)
The influence of shot peening (SP) on high cycle fatigue (HCF) performance of smooth and notched specimens of hot-extruded ZK60 magnesium alloy was investigated and compared to that of hot-extruded and T5 aging-treated ZK60 magnesium alloy referred to as ZK60-T5. The increases in fatigue properties at the optimum Almen intensities were found to depend on the material states. In contrast to ZK60 alloy, higher smooth and notched fatigue properties for both unpeened and peened specimens were observed for ZK60-T5 alloy. Meanwhile, the improvement of fatigue life for notched specimen by SP was much more than that for the smooth specimen. The mechanism by which the compressive residual stress induced by SP resulted in the improvement of fatigue performance of smooth and notched specimens for ZK60 and ZK60-T5 alloys was discussed. I. INTRODUCTION
The weight reduction of automobiles is one of the most effective ways to improve fuel consumption because the resistance of a vehicle to rolling, climbing, and acceleration are directly dependent on the vehicle mass. Therefore, the application of magnesium alloys, which have a density that is roughly 25% of steel and 66% of aluminum is expected to increase substantially in this decade.1,2 For these automotive components under the combined actions of fluctuating loads and corrosive environment, good high cycle fatigue (HCF) performance must be achieved. However, in comparison to aluminum a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2010.0173 J. Mater. Res., Vol. 25, No. 7, Jul 2010
http://journals.cambridge.org
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alloys and steels, the research results on fatigue properties of magnesium alloys, especially notched fatigue properties, are still limited. Some research has shown that the fatigue properties of magnesium alloys are poor,3,4 thus making it difficult to apply the alloys for loadbearing parts in automobiles. Therefore, the improvement of the fatigue properties of smooth and notched specimens of magnesium alloys becomes a vital research subject. On
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