The microstructure and mechanical properties of low-temperature and low-speed extruded Mg–3Sn–2Al–1Zn alloy

ABSTRACT

The microstructure and mechanical properties of the Mg–3Sn–2Al–1Zn (TAZ321) alloy extruded at 180–250°C and at a ram speed of 0.08 mm/s were investigated by optical microscope, X-ray diffraction, scanning electron microscope, transmission electron microscope, tensile testing and microhardness tester. The results indicate that the as-extruded alloy shows ultrafine dynamic recrystallisation grains, nanoscale Mg₂Sn precipitates of 50–80 nm, strong texture and excellent mechanical properties, the degree of which mainly depends on the extrusion temperature. The tensile yield strength and elongation vary from 413 MPa and 6.7% of TAZ321 extruded at 180°C to 312 MPa and 14.1% of TAZ321 extruded at 250°C, which can be regulated flexibly.

KEYWORDS:

• Magnesium alloy
• extrusion
• low temperature
• dynamic recrystallisation

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Wucheng Ding http://orcid.org/0000-0003-0361-6233

Yungui Chen http://orcid.org/0000-0001-8403-7289