Enhanced mechanical properties of as-cast Mg-Al-Ca magnesium alloys by friction stir processing

•As-cast Mg-xAl-yCa alloys were friction stir processed to disperse intermetallics.•More stable Al-Ca intermetallics were formed in Ca-containing alloys.•Dispersion and fragmentation of intermetallics led to grain refinement in stir zone.•AX43 alloy showed more intense grain refinement compared to t...

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Bibliographic Details
Published in:Materials letters 2021-08, Vol.296, p.129880, Article 129880
Main Authors: Nasiri, Zahra, Sarkari Khorrami, Mahmoud, Mirzadeh, Hamed, Emamy, Massoud
Format: Article
Language:English
Subjects:
Aluminum
Calcium
Friction
Friction stir processing
Grain refinement
Grain size
Intermetallic compounds
Magnesium alloys
Magnesium base alloys
Materials science
Mechanical properties
Metals and alloys
Microstructure
Tensile properties
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Summary:•As-cast Mg-xAl-yCa alloys were friction stir processed to disperse intermetallics.•More stable Al-Ca intermetallics were formed in Ca-containing alloys.•Dispersion and fragmentation of intermetallics led to grain refinement in stir zone.•AX43 alloy showed more intense grain refinement compared to the Mg-7Al alloy. Friction stir processing (FSP) of as-cast Mg-7Al, Mg-4Al-3Ca (AX43), and Mg-2Al-5Ca (AX25) magnesium alloys led to the remarkable grain refinement and enhancement of mechanical properties. This is due to the replacement of the interconnected, brittle constituents with uniformly dispersed fine particles after FSP. Due to the presence of thermally-stable Al-Ca intermetallics, the calcium-containing alloys showed more intense grain refinement compared to the Mg-7Al alloy with unstable Mg17Al12 phase. The friction stir processed AX43 alloy with a grain size of 1.7 μm exhibited the best tensile properties.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.129880