Production of nondendritic semisolid ZA3 alloy through heat treatment

Research output: Contribution to journalArticle

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Abstract

ZA3 is a zinc-based alloy with aluminium as its main alloying element. Producing ZA3 product by semisolid metal processing (SSM) can offer significant advantages such as the reduction of macrosegregations, porosity and low forming efforts. The aim of this study was to produce nondendritic semisolid ZA3 alloy through heat treatment. The thermal and microstructure analysis of ZA3 alloy were studied using Differential Scanning Calorimeter (DSC) and Scanning Electron Microscopy (SEM). The solidus and liquidus of the alloy can be determined by DSC analysis. The changes to the microstructures in response to two different isothermal treatments were investigated. They are heating at 100°C for 3-6 h and at 280°C for 0.5-5 h, respectively. Subsequently, all of the treated samples are partially remelt at 383°C for 15 min. The initial as-cast ZA3 alloy consisted of dendritic microstructure typical of a cast ingot. The major effort in the semi-solid technologies is the generation of small and spherical morphologies. The results indicated that when the respective heat-treated ZA3 alloy at 100°C for 4.5 h and 280°C for 3 h was subjected to partial remelting into its semisolid zone, the dendritic arms coalesced and coarsened into fine solid grains of 34±17 um with corresponds to 0.84 of shape factor and 33±16 um with the best shape factor of 0.85.

Original languageEnglish
Pages (from-to)323-329
Number of pages7
JournalJournal of Applied Sciences
Volume11
Issue number2
DOIs
Publication statusPublished - 2011

Fingerprint

Heat treatment
Calorimeters
Microstructure
Scanning
Remelting
Alloying elements
Ingots
Zinc
Porosity
Aluminum
Heating
Scanning electron microscopy
Processing
Metals
Hot Temperature

Keywords

  • Dendritic
  • Liquidus
  • Partially remelt
  • Solidus
  • Spherical morphologies

ASJC Scopus subject areas

  • General

Cite this

Production of nondendritic semisolid ZA3 alloy through heat treatment. / Arif, M. A M; Omar, Mohd. Zaidi; Muhamad, Norhamidi.

In: Journal of Applied Sciences, Vol. 11, No. 2, 2011, p. 323-329.

Research output: Contribution to journalArticle

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