Affiliation:
1. China University of Mining and Technology
2. Beijing Institute of Aeronautical Materials
Abstract
The chemical element and its valence at the fracture surface of SiCp/Al2O3-Al
composites synthesized by oxidative infiltration of Al melt were analyzed quantitatively using
X-ray photoelectron spectrometer(XPS), the percentage content of various phase at fracture surface
was determined accordingly. Additionally, the volume fraction of different phase in the composites
was meassured by optical metallographic examination of the three-dimensional section. And then,
by the comparison of phase content between fracture surface and section of the composites, the
preference for the crack penetrating various phases of the composites was identified ,which in turn
micro-fracture mechanisms of the composites were revealed quantitatively. It is proved that SiC
particle size has a critical influence on the percent content of co-continuous Al2O3 and Al phases, as
well as the micro-fracture mechanisms of this kind of composites. Based on the analysis of
micro-fracture mechanisms, the moderate size (about 10μm) of SiC particulate would be beneficial
to the mechanical properties of composites, the tested results of mechanical properties under room
and elevated temperature verified the hypothesis.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science