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 journalArticleResearchpeer-review

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

Fingerprint

cast alloys
magnesium alloys
Magnesium alloys
friction
Wear of materials
Friction
heat treatment
Processing
wear resistance
Heat treatment
wear tests
Wear resistance
microstructure
precipitates
dissolving
Microstructure
Precipitates
Dissolution
Annealing
annealing

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Cite this

The effects of friction stir processing on the wear beahvior of cast AZ91C magnesium alloy. / Hassani, Behzad ; Karimzadeh, Fathallah ; Enayati, Mohammad Hossein ; Mutschlechner, Fabian; Vallant, Rudolf; Hassani, Kamran.

In: International Journal of Materials Research, Vol. 109, No. 3, 109, 2018, p. 1-9.

Research output: Contribution to journalArticleResearchpeer-review

Hassani, Behzad ; Karimzadeh, Fathallah ; Enayati, Mohammad Hossein ; Mutschlechner, Fabian ; Vallant, Rudolf ; Hassani, Kamran. / The effects of friction stir processing on the wear beahvior of cast AZ91C magnesium alloy. In: International Journal of Materials Research. 2018 ; Vol. 109, No. 3. pp. 1-9.
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AB - The microstructure and wear properties of AZ91C alloywere studied by performing solution annealing and thenaging heat treatment, friction stir processing, and frictionstir processing followed by solution annealing and aging.The heat-treated microstructure included fine dendriticgrains (50 ± 14.2 lm) with a considerable dissolution anddispersion of continuous network-like b-Mg17Al12 precipitatesat grain boundaries. Friction stir processing significantlyrefined the microstructure and grains (9 ± 2.3 lm);followed by the breaking-up and dissolution of dendritesand continuous b-Mg17Al12 precipitates. Heat treatment ofthe friction stir processed area resulted in excessive graingrowth (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 stirprocessed samples showed improvement in wear behaviorat low stress, while at the higher stresses, along with the effectivenessof other processes it was the most effective processon improving the wear resistance. Heat treatment hadthe most effect on improving the wear resistance at the intermediatestress; moreover, applying it on the friction stirprocessed area remarkably enhanced the wear resistance atall stresses. Heat treatment of the friction stir processed areaalso resulted in the lowest friction coefficient values duringthe wear test, indicating the convenience of this process forwear performance of cast AZ91C alloy. Abrasion wasshown as the dominant wear mechanism.

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