On the applicability of Cu–17Zn–7Al–0.3Ni shape memory alloy particles as reinforcement in aluminium-based composites: Structural and mechanical behaviour considerations

Kenneth K. Alaneme, Oyediran Mayokun, Michael O. Bodunrin, Saheed A. Babalola, Adeolu A. Adediran, Kayode J. Olaleye

Research output: Contribution to journalArticlepeer-review

Abstract

The potentials of CuZnAlNi shape memory alloys to serve as viable reinforcement in Aluminium matrix composites (AMCs) was investigated. The AMCs were double stir cast developed, containing 4, 6, and 8 wt% CuZnAlNi particles; and their structural characteristics and mechanical properties were compared with that of the unreinforced Al alloy and AMC containing 8 wt% SiC. Scanning electron microscopy and X-ray diffraction results show that the CuZnAlNi refined the grain size, and increase in the CuZnAlNi wt% resulted in the formation of varied AlCu-based intermetallics, apart from the primary Al rich phase. The strength indicators – hardness, ultimate tensile strength, and specific strength largely improved with increase in the CuZnAlNi wt% and were comparatively higher than that of the unreinforced Al alloy and AMC reinforced with 8 wt% SiC for the 6 and 8 wt% CuZnAlNi reinforced AMC (specific strength being the only exception). The percentage elongation and fracture toughness values of the AMCs reinforced with CuZnAlNi (12–14.5% and 10.5–12.3 MPa m1/2) were equally superior to the SiC reinforced AMC (9% and 6.5 MPa m1/2, respectively). However, a partial reduction in the % elongation was observed with the increase in the CuZnAlNi wt%. Improved matrix/particle interface bonding, matrix refinements, thermoelastic-induced compressive residual stresses, inherent ductile, and tough nature of the SMA were advanced as mechanisms responsible for the improvements in properties.

Original languageEnglish
Pages (from-to)663-672
Number of pages10
JournalJournal of the Mechanical Behavior of Materials
Volume31
Issue number1
DOIs
Publication statusPublished - 1 Jan 2022

Keywords

  • Aluminium matrix composites
  • Cu based shape memory alloys
  • Damage tolerance
  • Metallic reinforcements
  • Strengthening mechanisms
  • Thermoelastic effect

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanics of Materials

Fingerprint

Dive into the research topics of 'On the applicability of Cu–17Zn–7Al–0.3Ni shape memory alloy particles as reinforcement in aluminium-based composites: Structural and mechanical behaviour considerations'. Together they form a unique fingerprint.

Cite this