Microstructure and Mechanical Properties of 45 vol.% SiCp/7075Al Composite. Issue 9 (September 2015)

• Record Type: Journal Article
• Authors: Xiu, Ziyang; Yang, Wenshu; Dong, Ronghua; Hussain, Murid; Jiang, Longtao; Liu, YongXing; Wu, Gaohui
• Is Part Of: Journal of materials science & technology. Volume 31:Issue 9(2015:Sep.)
• Page Start: 930
• Page End: 934
• Publication Date: 2015-09
• Subjects: Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2015.01.012
• Languages: English
• ISSNs: 1005-0302

Abstract

<abstract xml:lang="en" abstract-type="author" id="ab0010"> <title> <x xml:space="preserve">Abstract</x> </title> <sec> <p id="sp0010">Microstructure and mechanical behavior of high volume content SiC<sub>p</sub>/7xxxAl composites have not been explored yet. Therefore, in the present work, 45 vol.% SiC<sub>p</sub>/7075Al composite has been prepared by pressure infiltration method. High density dislocations were found around SiC/Al interface in SiC<sub>p</sub>/7075Al composite after water-quenching and aging treatment. Fine dispersed nano-η′ phases were observed after the aging treatment. Adverse to other SiC<sub>p</sub>/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.% SiC<sub>p</sub>/7075Al composite demonstrated high tensile strength (630 MPa) and micro-ductility. Compared to aged SiC<sub>p</sub>/2024Al composite, the aged SiC<sub>p</sub>/7075Al composite showed an increase of about 200% in the tensile strain and 90% in the tensile strength, respectively. It is speculated that nano-η′ 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 SiC<sub>p</sub>/7075Al composite.</p> </sec> </abstract>