挤压和峰值时效态Mg-6A...力学性能之间的关系(英文) 王森.pdf

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Transa
Technology, Qingdao 266525, China
Abstract: Herein, the microstructure and mechanical properties of as-extruded and
as-aged Mg–6Al–3Sn–2Zn (ATZ632) alloys were investigated. The as-extruded alloy
shows excellent mechanical properties, achieving the yield strength (YS), ultimate
tensile strength (UTS), and elongation (EL) of MPa, MPa, and %,
respectively. After aging treatment, the volume fraction of the precipitated Mg17Al12
phase increases and the Mg4Zn7 phase appears. The YS and UTS of the as-aged
ATZ632 alloy increased to and MPa, respectively; however, EL
decreased to %. The excellent strength of the as-aged alloys is attributed to the
precipitated Mg4Zn7 phase with an orientation perpendicular to the (0001) plane of
α-Mg and the Mg17Al12 phase with an orientation parallel to the basal plane.
Furthermore, the precipitation after aging decreases the EL. Static recrystallization
grains appear during low-temperature aging at 150℃, and their orientation shows a
high degree of consistency with the c-axis perpendicular to the extrusion direction.
Key words: Microstructure; mechanical property; aging; strengthening mechanism;
static recrystallization; precipitate orientation
1 Introduction
As the lightest structural materials, Mg alloys exhibit high specific strength,
specific rigidity, thermal conductivity, and good electromagnetic shielding
performance. Thus, they have received considerable attention in the fields of
transporta