Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Fo
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Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi‑Directional Forging L. B. Tong1,2 · J. H. Chu1,3 · D. N. Zou1 · Q. Sun1 · S. Kamado4 · H. G. Brokmeier5 · M. Y. Zheng2 Received: 1 July 2020 / Revised: 16 July 2020 / Accepted: 18 July 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, the mechanical properties and damping capacities of cast Mg-5.5Zn-0.6Zr (weight percent, ZK60) alloys have been simultaneously improved by a facile multi-directional forging (MDF) processing, and the mechanisms of microstructure evolution and texture modification are systematically investigated. The activation of tension twinning occurs during the initial MDF stage, due to the coarse-grained structure of the as-cast alloy. With increasing MDF passes, the continuous dynamic recrystallization (CDRX) results in a fine equiaxed-grain structure. The typical non-basal texture is formed in the as-MDFed alloy for 6 passes, with the (0001) planes inclined 60°–70° to forged direction and 10°–20° to transverse direction, respectively. A good balance between the strength (~ 194.9 MPa) and ductility (~ 24.9%) has been achieved, which can be ascribed to the grain refinement, non-basal texture and fine precipitate particles. The damping capacity is remarkably improved after MDF processing, because the severe deformation increases the dislocation density, which effectively enlarges the sweep areas of mobile dislocations. Keywords Mg alloy · Multi-directional forging · Microstructure · Texture evolution · Mechanical properties · Damping capacity
1 Introduction In recent years, magnesium (Mg) and its alloys have attracted much concern in the aerospace, automobile, biomedical and defense industries, because of their low density, Available online at https://link.springer.com/journal/40195. * L. B. Tong [email protected] * M. Y. Zheng [email protected] 1
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3
College of Materials Science and Engineering, Jilin University, Changchun 130025, China
4
Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940‑2188, Japan
5
Institute of Materials Science and Engineering, Clausthal University of Technology, Agricolastrasse 6, 38678 Clausthal‑Zellerfeld, Germany
high strength-weight ratio, superior damping capacity and biocompatibility [1–3]. Unfortunately, the poor ductility severely restricts the workability of Mg alloy, due to its dense-hexagonal structure. Therefore, Mg alloy is usually considered as one of the typical “difficult to work” metallic materials [4, 5]. Moreover, the relatively low strength of Mg alloys compared with the steels, Ti or Al alloys also hinders their wide range of industrial applications [6, 7]. The microalloying (Al, Zn, Ca or Mn) and thermomechan
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