Fabrication and properties of functionally graded Al/AlB2 composites

Kayikci R., Savaş Ö.

JOURNAL OF COMPOSITE MATERIALS, vol.49, pp.2029-2037, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49
  • Publication Date: 2015
  • Doi Number: 10.1177/0021998314541490
  • Journal Name: JOURNAL OF COMPOSITE MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2029-2037
  • Keywords: Aluminium boride, boron oxide, functionally graded Al-AlB2 composite, aluminium matrix composites, METAL-MATRIX COMPOSITES, B MASTER ALLOYS, MECHANICAL-PROPERTIES, WEAR-RESISTANCE, MICROSTRUCTURE
  • Yıldız Technical University Affiliated: Yes

Abstract

In the present study, an AlB2-reinforced functionally graded aluminium matrix composite has been produced by centrifugal casting. Boron 1.2-1.85% by weight has been dissolved in aluminium at 1400? by adding boron oxide resulting in AlB2 flakes 2.71-4.20% by weight before being cast centrifugally at 800?. Results showed that there were two distinct regions without a smooth grading: one is rich of AlB2 and the other is poor of AlB2. The highest AlB2 content has been found to be around 11% in outer zones, whereas the lowest AlB2 content has been observed to be below 0.02% in inner zones. Results also showed that, depending on the increase in the reinforcement phase in outer zones, up to 64% increase in the strength and hardness of the composite has been achieved.