NDLI: In situ (α-Al$_{2}$O$_{3}$+ZrB$_{2}$)/Al composites with network distribution fabricated by reaction hot pressing

Content Provider	Springer Nature Link
Author	Mokhnache, El Oualid Wang, Gui song Geng, Lin Balasubramaniam, Kaveendran Henniche, Abdelkhalek Ramdani, Noureddine
Copyright Year	2015
Abstract	In situ (α-Al$_{2}$O$_{3}$+ZrB$_{2}$)/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis (DTA) was used to study the reaction mechanisms in the Al–ZrO$_{2}$–B system. X-ray diffraction (XRD) and scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al–ZrO$_{2}$–B system are 850°C and 60 min. In situ-synthesized α-Al$_{2}$O$_{3}$ and ZrB$_{2}$ particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al$_{2}$O$_{3}$ and ZrB$_{2}$ particles are approximately 1–3 μm. When the size of Al powder increases from 60–110 μm to 150–300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ (α-Al$_{2}$O$_{3}$–ZrB$_{2}$)/Al composites from Hv 163 to Hv 251.
Starting Page	1092
Ending Page	1100
Page Count	9
File Format	PDF
ISSN	16744799
Journal	International Journal of Minerals, Metallurgy, and Materials
Volume Number	22
Issue Number	10
e-ISSN	1869103X
Language	English
Publisher	University of Science and Technology Beijing
Publisher Date	2015-09-30
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	metal matrix composites network distribution sintering hot pressing microhardness Materials Science Metallic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Geochemistry and Petrology Mechanical Engineering

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