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Mikrostrukturuntersuchung und mechanische Eigenschaften eines Al‐Al 2 O 3 MMCs hergestellt durch halbfeste Erstarrung
Author(s) -
Carrasco C.,
Camurri C.,
García J.,
Montalba C.,
Prat O.,
Rojas D.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100785
Subject(s) - materials science , microstructure , composite material , alloy , ultimate tensile strength , elongation , aluminium , agglomerate , adhesion , yield (engineering) , metallurgy
The influence of the semi‐solid solidification production parameters (shear rate and agitation time) and the concentration of reinforcing particles on the microstructure formation and mechanical properties of a 520 aluminum alloy reinforced with Al 2 O 3 particles was investigated. Depending on the content of reinforcing particles and the stirring conditions different rosette structures were formed. The type of wear mechanism (delamination or adhesion) depends on the size of the rosettes and the distribution of Al 2 O 3 reinforcements. Best mechanical properties were obtained for metal matrix composites reinforced with 12 wt% of Al 2 O 3 stirred at a shear rate of 2100 s –1 for 1800 s. These samples showed tensile strength and yield stress similar to the commercial A520 alloy. The hardness and wear resistance were improved by the addition of Al 2 O 3 particles, meanwhile the elongation to fracture was reduced.