期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 31, 期 9, 页码 930-934出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2015.01.012
关键词
Metal matrix composite; 7075Al; Interface; Nano precipitation; Mechanical properties
资金
- Key Laboratory Fund of Harbin Institute of Technology [5780011513]
- University Basic Fund of Harbin Institute of Technology [5710011113]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF. 20161]
Microstructure and mechanical behavior of high volume content SiCp/7xxxAl composites have not been explored yet. Therefore, in the present work, 45 vol.% SiCp/7075Al composite has been prepared by pressure infiltration method. High density dislocations were found around SiC/Al interface in SiCp/7075Al composite after water-quenching and aging treatment. Fine dispersed nano-eta' phases were observed after the aging treatment. Adverse to other SiCp/Al composites prepared by the pressure infiltration method, an interface layer was observed between SiC particles and Al matrix. Furthermore, high-resolution transmission electron microscopy (HRTEM) observation indicated that this interface layer was coherent/semi-coherent with that of the SiC particles. 45 vol.% SiCp/7075Al composite demonstrated high tensile strength (630 MPa) and micro-ductility. Compared to aged SiCp/2024Al composite, the aged SiCp/7075Al composite showed an increase of about 200% in the tensile strain and 90% in the tensile strength, respectively. It is speculated that nano-eta' phases in the Al matrix significantly contributed to the strengthening effect while the interface layer between SiC and Al matrix might be beneficial to the strength and plasticity of SiCp/7075Al composite. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.
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