Effects of Mg^sub 2^B^sub 2^O^sub 5^ whiskers on microstructure and mechanical properties of AZ31B magnesium matrix composites

The AZ31B matrix composites reinforced with different volume fractions (1.0, 3.5 and 6.0 vol%) of Mg2B2O5 whiskers were fabricated by stir casting. The microstructure, reinforcement distribution and texture evolution of the as-extruded specimens were investigated by optical microscopy, transmission...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 684; p. 205
Main Authors Zhu, YP, Jin, PP, Fei, WD, Xu, SC, Wang, JH
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 27.01.2017
Subjects
Basal plane
Casting
Concentration (composition)
Elongation
Extrusion
Grain refinement
Magnesium
Mechanical properties
Metal matrix composites
Microstructure
Optical microscopy
Reinforcement
Scanning electron microscopy
Tensile tests
Texture
Transmission electron microscopy
Whisker composites
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Summary:The AZ31B matrix composites reinforced with different volume fractions (1.0, 3.5 and 6.0 vol%) of Mg2B2O5 whiskers were fabricated by stir casting. The microstructure, reinforcement distribution and texture evolution of the as-extruded specimens were investigated by optical microscopy, transmission electron microscopy, scanning electron microscopy, and X-ray diffractometer. Microstructure characterization revealed relatively uniform distribution of reinforcement and significant grain refinement in the composite samples. It was found by X-ray diffractometer analyses that a typical fiber texture with (0002) basal plane parallel to the extrusion direction formed in both AZ31B alloys and Mg2B2O5 w/AZ31B composites. The Mg2B2O5 whiskers could weaken the texture and the fiber texture intensity decreases as the Mg2B2O5 whiskers volume fraction increases. Tensile tests along the extrusion direction were carried out at room temperature. It is the first time to find that the presence of Mg2B2O5 whiskers reinforcement could improve both the strength and elongation of AZ31B matrix composites with low volume fraction of Mg2B2O5 whiskers
ISSN:0921-5093
1873-4936