Effect of NbB2 addition on the microstructure and mechanical properties of mechanically alloyed Al-12.6Si alloys

Emre Tekoglu, Siddika Mertdinç, Hasan Go¨kçe, Duygu Agaogullari, M. Lu¨tfi O¨veçoglu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This study reports the effect of NbB2 particles on the Al-12.6 wt.% Si matrix powders and composites in regard of physical, microstructural and mechanical properties. In order to obtain hybrid powders, Al-12.6 wt.% Si-2 wt.% NbB2 blends were mechanically alloyed (MA'd) for various durations (1, 4 and 8 h ) in a Spex™ Mixer/Mill using hardened steel vial/balls with a 7/1 ball-to-powder weight ratio. A hydraulic press with a uniaxial pressure of 450 MPa was used for the compaction of the as-blended/MA'd powders. Green compacts were sintered at 570°C for 2 h under Ar gas atmosphere. X-ray diffractometry (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) techniques were utilized for the microstructural characterization of the as-blended/MA'd powders and the sintered composites. Differential scanning calorimetry (DSC) analyses were also conducted on the powder products. Sintered samples were characterized by density and Vickers microhardness measurements and sliding wear tests. With increasing MA time, mechanical improvement in composite properties was observed. Reinforcing particles had positive effect on the mechanical properties of the matrix: Al-12.6 wt.% Si-2 wt.% NbB2 MA'd for 4 h showed higher microhardness value (158.50±10.02 MPa) and lower wear volume loss (0.161 mm3) than those of Al-12.6 wt.% Si matrix MA'd for 4 h. Al-12.6 wt.% Si matrix MA'd for 4 h showed microhardness value (146.70±8.81 MPa) and wear volume loss (0.194 mm3).

Original languageEnglish
Title of host publicationProceedings of the 2nd World Congress on Mechanical, Chemical, and Material Engineering, MCM 2016
PublisherAvestia Publishing
ISBN (Print)9781927877272
DOIs
Publication statusPublished - 2016
EventProceedings of the 2nd World Congress on Mechanical, Chemical, and Material Engineering, MCM 2016 - Budapest, Hungary
Duration: 22 Aug 201623 Aug 2016

Publication series

NameProceedings of the World Congress on Mechanical, Chemical, and Material Engineering
ISSN (Electronic)2369-8136

Conference

ConferenceProceedings of the 2nd World Congress on Mechanical, Chemical, and Material Engineering, MCM 2016
Country/TerritoryHungary
CityBudapest
Period22/08/1623/08/16

Bibliographical note

Publisher Copyright:
© Avestia Publishing, 2017.

Keywords

  • Al-Si matrix composites
  • Mechanical alloying
  • NbB2 Reinforcing particles
  • Pressureless sintering

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