The effects of friction stir processing on the wear beahvior of cast AZ91C magnesium alloy

Behzad Hassani, Fathallah Karimzadeh, Mohammad Hossein Enayati, Fabian Mutschlechner, Rudolf Vallant, Kamran Hassani

Research output: Contribution to journalArticle

Abstract

The microstructure and wear properties of AZ91C alloy
were studied by performing solution annealing and then
aging heat treatment, friction stir processing, and friction
stir processing followed by solution annealing and aging.
The heat-treated microstructure included fine dendritic
grains (50 ± 14.2 lm) with a considerable dissolution and
dispersion of continuous network-like b-Mg17Al12 precipitates
at grain boundaries. Friction stir processing significantly
refined the microstructure and grains (9 ± 2.3 lm);
followed by the breaking-up and dissolution of dendrites
and continuous b-Mg17Al12 precipitates. Heat treatment of
the friction stir processed area resulted in excessive grain
growth (175 ± 71.4 lm) and dispersion of fine b precipitates.
Under a range of applied stresses (0.78 MPa,
2.44 MPa and 3.66 MPa) for the wear tests, only friction stir
processed samples showed improvement in wear behavior
at low stress, while at the higher stresses, along with the effectiveness
of other processes it was the most effective process
on improving the wear resistance. Heat treatment had
the most effect on improving the wear resistance at the intermediate
stress; moreover, applying it on the friction stir
processed area remarkably enhanced the wear resistance at
all stresses. Heat treatment of the friction stir processed area
also resulted in the lowest friction coefficient values during
the wear test, indicating the convenience of this process for
wear performance of cast AZ91C alloy. Abrasion was
shown as the dominant wear mechanism.
Original languageEnglish
Article number109
Pages (from-to)1-9
JournalInternational Journal of Materials Research
Volume109
Issue number3
DOIs
Publication statusE-pub ahead of print - 2018

Keywords

  • AZ91C magnesium alloy; Friction stir processing; T6 heat treatment; Wear

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

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