Microstructure and mechanical properties of a novel TiNi particulate reinforced AZ91 metal matrix composite

Kelen F., GAVGALI M., Aydoğmuş T.

MATERIALS LETTERS, vol.233, pp.12-15, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 233
  • Publication Date: 2018
  • Doi Number: 10.1016/j.matlet.2018.08.121
  • Journal Name: MATERIALS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.12-15
  • Keywords: AZ91 alloys, TiNi alloys, Metallic composites, Hot pressing, Microstructure, Mechanical properties, SHAPE-MEMORY ALLOYS
  • Ataturk University Affiliated: Yes

Abstract

A new AZ91/TiNi composite has been developed in the present study. The composite containing 20% (vol.) TiNi reinforcement micro-particles was produced by hot pressing of initial prealloyed AZ91D and Ti49.2Ni50.8 powders at 420 degrees C for 1 h. Microstructural analysis revealed that matrix and reinforcement phases did not react each other during processing and a good bonding which is free from porosity, oxide and carbides was attained. Ti49.2Ni50.8 reinforcement increased room temperature yield strength, compressive strength and ductility of AZ91D alloy 5%, 50% and 30%, respectively. Most importantly, yield strength of the composite at 100 degrees C was found to be 267 MPa, 50% higher than that of AZ91D alloy (176 MPa) due to stress-induced martensitic transformation observed in the reinforcing alloy. (C) 2018 Elsevier B.V. All rights reserved.