Damage behavior of heterogeneous magnesium matrix nanocomposites
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Research Letter
Damage behavior of heterogeneous magnesium matrix nanocomposites Xi Luo, Xu He, and Jinling Liu, State Key Laboratory of Traction Power & School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, Sichuan 610031, China Xinxin Zhu and Song Jiang, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China Ke Zhao, State Key Laboratory of Traction Power & School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, Sichuan 610031, China Linan An, Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA Address all correspondence to Jinling Liu at [email protected] (Received 27 March 2020; accepted 7 May 2020)
Abstract Heterogeneous magnesium matrix nanocomposites (Hetero-Mg-NCs) exhibited excellent strength–toughness synergy, but their damage behavior and toughness mechanism lacked of investigation. Here, atomic force microscopy was first employed to characterize the microstructure evolution and damage behavior of the Hetero-Mg-NCs after indentation. The heterogeneous structure comprised of pure Mg areas (soft phase) and Mg nanocomposite areas (hard phase) was revealed by the electrostatic force microscopy. Furthermore, the surface morphology and cracks of the deformed area were investigated with high resolution. The results indicated the soft phase undertook most of the deformation and played an important role in capturing and blunting the crack.
Introduction Heterogeneous magnesium matrix nanocomposites (Hetero-Mg-NCs) are a new class of particle-reinforced nanocomposites with bioinspired microstructure, which consists of soft and hard phases caused by the nonuniform distribution of nanometer-sized reinforcement.[1–4] Such a combination of the soft and hard phases has been shown to enable the designed composites to exhibit excellent mechanical properties (such as strength and toughness), which partially overcomes the dilemma between strength and toughness of traditional metal matrix composites.[5–8] Hence, the heterogeneous lightweight metal matrix nanocomposites have attracted more and more attention due to their potential applicability in automotive, aerospace, defence, and other industries.[9–12] Previous studies only focused on the elastoplastic deformation and fracture of these heterogeneous composites,[13–15] but the damage behaviors are still unidentified. Indeed, damage usually occurs followed the elastoplastic deformation and affects the failure mode and fracture toughness of the materials.[16] In order to better understand the relationship between the microstructure and performance, it is necessary to study the damage behavior of Hetero-Mg-NC. However, it is challenging to distinguish the
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