Investigation on microstructure and fracture mechanism of n-SiC p /7075 Al composites
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ORIGINAL ARTICLE
Investigation on microstructure and fracture mechanism of n‑SiCp/7075 Al composites Cheng Ming Zuo1 · Xiao Ming Du2 · Dao Cheng Luan1 · Kai Feng Zheng2 · Zhi Hua Hu1 · Yuan Li1 · Tian Xin Deng1 · Yang Ren1 · Zheng Yun Wang1 Received: 27 July 2020 / Accepted: 18 August 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In the present study, the composites have been prepared using vacuum hot pressing process technique. The influence of 2.0 wt.% nanometric SiC particles (n-SiCp) on the microstructure and fracture mechanism of 7075 aluminum alloy was studied by means of metallographic microscope, scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD), laser scanning confocal (LSC). The results indicate that SiCp fill at grain boundaries dispersing evenly and nail to aluminum grains which sizes have been reduced successfully, that making the organization tighter, the gaps fewer and the surface rougher. Meanwhile, phases (MgZn2) precipitated from the 7075 aluminum alloy were been detected. The grain bonding states of matrix alloys are strengthened by the combination of fine grains strengthening and dispersion strengthening and thus affect the fracture morphology. The micro-fracture mechanism of 7075 aluminum alloy is micro-porous aggregation fracture, however, the 7075 aluminum matrix composites (AMCs) are quasi cleavage fracture. Keywords Composite materials · 7075 aluminum alloy · Microstructure · Fracture mechanism
Introduction 7075 aluminum alloy is an ultra-strong aluminum alloy for Al–Zn–Mg–Cu system, which is widely used in many fields of equipment manufacturing, especially in aerospace industry. For instance, it is used to make structural stress parts of C919 large passenger plane made by China, the wing wall plate and the girder bar on the wing of ARJ21-700 regional jet, the wing of the Boeing 737 and other major international aircraft components. In addition, nanoparticles are often used to enhance the properties of composites, but their manufacturing processes are complex, energy consumption and pollution are serious. Therefore, more and more scholars are committed to the research and manufacturing, application of nanoparticles at the same time to find energy-saving * Xiao Ming Du [email protected] * Zheng Yun Wang wzy‑[email protected] 1
School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
School of Materials Science and Engineering, Shenyang ligong University, Shenyang 110000, China
2
and environment-friendly green production methods (Zhang et al. 2020, 2018; Masoudi et al. 2014). After the current advanced production concept has been put into practical use, it has been widely used in the fields of semiconductor, aerospace industry and so on, which has greatly changed people’s understanding of the production, manufacturing and application of nanoparticles (Jaya et al. 2012; Zhang et al. 2012). For example, materials used in the aviation industry are required to have high strength, high resonance
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