Microstructural study and mechanical properties of a thixoformed AZ91

M. Cabibbo, E. Cerri, E. Evangelista, S. Spigarelli, M. Talianker, V. Ezersky

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations


The microstructure of a thixoformed AZ91 (Mg-Al-Zn system) alloys was investigated by different techniques and mechanical tests were performed after different heat treatments conditions. A correlation was established between microstructure and mechanical properties. The material was furnished in the thixocast state, and then solution treated and aged in order to study its ageing response. Optical microscopy, scanning and electron microscopies and X-rays were carried out to follow the structure evolution. Observations showed that the α-Mg developed into globules, while the β-phase (Mg17Al12) particles are present only in the eutectic area. During solution treatment at 415°C the original microstructure was produced by thixoforming transformed in a conventional structure of equiaxed grains with a redistribution of solute atoms. Different precipitates were observed during heat treatments. A quasicrystal phase of composition close to (Al,Mg)86Mn14 was also observed after solution treatment and quenching. A good compromise of mechanical properties is reached after 4-6h heat treatment at 415°C.

Original languageEnglish
Number of pages7
StatePublished - 1 Jan 2000
EventMagnesium Technology 2000 - Nashville, TN, United States
Duration: 12 Mar 200016 Mar 2000


ConferenceMagnesium Technology 2000
Country/TerritoryUnited States
CityNashville, TN

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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