The Effect of Magnesium Additions on Microstructural, Thermal, and Mechanical Properties of Rapidly Solidified Al-5.5wt.%Zn-x wt.%Mg (x=1, 5) Alloys

KARAKÖSE E., ÇOLAK H., KESKİN M.

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, vol.29, no.11, pp.7308-7320, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 11
  • Publication Date: 2020
  • Doi Number: 10.1007/s11665-020-05246-2
  • Journal Name: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.7308-7320
  • Erciyes University Affiliated: Yes

Abstract

The effect of magnesium addition on the morphological, thermal, and mechanical features of conventionally and rapidly solidified Al-5.5 wt.%Zn-x wt.%Mg (x = 1, 5) samples were examined in this work. Al-5.5wt.%Zn-x wt.%Mg (x = 1, 5) samples were produced by the conventionally solidified graphite casting and rapid solidification by the melt-spinning method. The morphological and phase structures of the alloys were shown by field emission scanning electron microscopy and x-ray diffractometry. The melting temperatures were examined by differential thermal analysis in an Argon gas environment and the stress and microhardness characteristics of the conventionally solidified and melt-spun ribbons were determined by hardness and tensile strength tests. It was observed that the content of 5 wt.%Mg allowed a radical change in the conventionally solidified alloy morphologies, such as nano-sized dot shape Al12Mg17 particles and smaller sized square shaped MgZn2 particles. Moreover, the ultimate tensile strength, yield strength, and microhardness values of the rapidly solidified Al-5.5Zn-5Mg samples increased by approximately 20%. Finally, it was observed that the microstructural and mechanical properties, such as microhardness/stress values and grain size refinement, were improved with high wheel speeds.