Abstract
Al-Si metal matrix composites have generally been manufactured using casting methods. Powder metallurgy has been used as an alternative manufacturing technique to obtain more homogeneous and segregation-free products. In this study, 2 wt.-% TiB2 particle reinforced Al-7 wt.-% Si composites were manufactured using high energy ball milling, cold pressing (at 450 MPa) and pressureless sintering (at 570 °C for 2 h under Ar flow) techniques. The effects of different milling processes, such as mechanical alloying at room temperature and/or cryomilling in an isolated polycarbonate cylinder soaked in liquid nitrogen or sequential milling, on the Al-7 wt.-% Si-2 wt.-% TiB2 powders and corresponding bulk products were investigated. The microstructural, physical and mechanical properties of the composites sintered from the mechanically alloyed, mechanically alloyed and cryomilled, and sequentially milled powders were significantly improved as compared with those of as-blended ones. The highest density, the highest microhardness and the lowest wear rate were obtained in a composite sintered from mechanically alloyed and cryomilled powders at 92.38 %, 214.14 ± 41.17 HV and 3.8 × 10−3 mm3·N−1 × m−1, respectively.
Kurzfassung
Al-Si-Metallmatrixkomposite werden generell mittels Gießprozessen hergestellt. Die Pulvermetallurgie wird als alternativer Herstellungsprozess eingesetzt, um homogenere und ausscheidungsfreie Produkte zu erhalten. In der diesem Beitrag zugrunde liegenden Studie wurden mit 2 wt.-% TiB2-Partikel verstärkte Al-7 wt.-% Si Komposite hergestellt, indem die Techniken des Hochenergie-Kugelmahlens, des Kaltpressens (bei 450 MPa) und des drucklosen Sinterns (bei 570 °C für 2 h unter Ar-Schutzgas) angewandt wurden. Die Auswirkungen verschiedener Mahlprozesse, wie dem mechanischen Legieren bei Raumtemperatur und/oder dem Kryomahlen in einem isolierten Plykarbonatzylinder unter flüssigem Stickstoff oder das sequentielle Mahlen, auf die Al-7 wt.-% Si-2 wt.-% TiB2 Pulver und die entsprechenden Massenprodukte wurden untersucht. Die mikrostrukturellen, physikalischen und mechanischen Eigenschaften der Komposite, die aus den mechanisch legierten und kryogemahlenen sowie den sequentiell gemahlenen Pulvern gesintert wurden, wurden im Vergleich zu denen des Gemischten significant verbessert. Die höchste Dichte, die höchste Mikrohärte und die geringste Verschleißrate ergaben sich für die Komposite, die aus den mechanisch legierten und kryogesinterten Pulvern hergestellt wurden und zwar mit entsprechend 92.38 %, 214.14 ± 41.17 HV und 3.8 × 10−3 mm3 × N−1 × m−1.
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