Study of the microstructures and mechanical properties of ZK61 magnesium alloy cylindrical parts with inner ribs formed
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ORIGINAL ARTICLE
Study of the microstructures and mechanical properties of ZK61 magnesium alloy cylindrical parts with inner ribs formed by hot power spinning Shuai Yuan 1 & Qinxiang Xia 1 & Jinchuan Long 1 & Gangfeng Xiao 1 & Xiuquan Cheng 2 Received: 14 May 2020 / Accepted: 14 September 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Cylindrical parts with inner ribs (CPIR) of magnesium alloy have increasingly become a research focus to adapt the continuous improvement of lightweight requirement. The hot power spinning (HPS) method was proposed to form the magnesium alloy CPIR, and the microstructures, textures, and mechanical properties of blank and spun workpiece at cylindrical wall (CW) and inner rib (IR) were analyzed experimentally. The results show that the average grain size at CW and IR of spun workpiece is refined from 2.49 μm of blank to 1.88 μm and 2.11 μm, respectively. The c-axis of most grains at CW and IR of spun workpiece is deflected from tangential direction (TD) to radial direction (RD) by 90° and 72°, respectively. Compared with blank, the elongation at CW and IR of spun workpiece is increased by 52.2% and 39.8%, respectively. The yield strength and ultimate tensile strength of IR are basically the same as those of blank, while those of CW are decreased by 6.5% and 3.9%, respectively. The difference of macro fracture directions of tensile specimen of blank and spun workpiece is resulted from the change of grains c-axis direction and the increase of grain freedom degree around c-axis. Keywords ZK61 magnesium alloy . Cylindrical parts with inner ribs . Hot power spinning . Microstructure . Texture . Mechanical properties
1 Introduction Magnesium alloys with low density, high specific strength, and specific stiffness are one of the most promising lightweight materials [1, 2]. Meanwhile, cylindrical parts with inner ribs (CPIRs) are increasingly used for reducing weight and improving overall performance of products such as aircraft, spacecraft, and military weapons, which makes magnesium alloy CPIR very attractive for the lightweight of key components [3, 4]. However, magnesium alloys with the closepacked hexagonal crystal structure exhibit poor ductility at room temperature, and their plastic forming is normally carried out under heating condition [5, 6]. Hot power spinning * Qinxiang Xia [email protected] 1
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
2
School of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou 510403, China
(HPS) is considered to be an effective method for manufacturing the thin-walled cylindrical parts made of difficult-todeform metals [7]. Therefore, the method of HPS can be used to realize the precision forming of magnesium alloys CPIR. However, magnesium alloys have been found to exhibit a large linear expansion coefficient and thermal conductivity [8, 9], which enhance the difficulty of temperature uniformity control between cylindrical wall (CW
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