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Study on microstructure and tensile properties of in situ fiber reinforced aluminum matrix composites
Ist Teil von
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2008-03, Vol.476 (1), p.157-161
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2008
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
A new in situ fiber reinforced aluminum matrix composites (in situ Al-MMCs) was fabricated based on powder metallurgy (PM). The reinforced fiber was in situ synthesized during hot extrusion procedure of a mixed pure metal powders compact of Al–10
wt%Mg. The microstructure and tensile properties of the in situ Al-MMCs were analyzed and measured. The experimental results showed that the in situ aluminum matrix composites consists of aluminum matrix and fibrous β-Al
3Mg
2 reinforcement with about tens of microns in diameter and 1
mm in length. Quantitative analysis showed that the content of reinforced fiber is about 18.9
wt%. The tensile stress–strain curve of in situ Al-MMCs involved a remarkable nonlinear deformation region and a long yield plateau region, and the reason is believed to result from deformation induced phase transition of β-Al
3Mg
2. The yield strength
σ
0.2, tensile strength and elongation of in situ Al-MMCs is 137
MPa, 147
MPa and 7.0%, respectively. No any fibers pulled out from aluminum matrix can be observed in fracture surface after tensile test. The tensile fracture mechanism of in situ Al-MMCs is quasi-cleavage feature model.