Decisive influence of critical process parameters on the microstructure and tensile properties of friction stir back extruded magnesium alloy tubes
Section snippets
Nomenclature/abbreviations
Symbol Properties/parameters Unit LTSFSBE Tensile strength in the longitudinal direction MPa HTSFSBE Tensile strength in the hoop direction MPa YS Yield strength of the base metal MPa TS Tensile strength of the base metal MPa PE Percentage elongation % N Tool rotational rate rpm. F Axial tool feed mm/min T Dwell time s. Tp Deformation temperature o C davg average grain size μm strain rate s−1 Ra Average material movement rps r Active radius of the dynamically recrystallised zone mm h Active depth of the dynamically
FSBE magnesium alloy billet preparation
As-casted magnesium ZE41 alloy plate was sliced and machined into a cylindrical rod with 22 mm diameter and 200 mm length with a rectangular base of 30 × 25 × 10 mm. The base avoids the billet rotation with the plunger during the FSBE process. The H13 steel plunger was machined to 18 mm diameter so that an annular space of 2 mm was available between the plunger and the inner diameter of the FSBE die. As schematically represented in Fig. 1, this setup ensures the final production of magnesium
Effects of poor process parameters selection
The FSBE process with the tool rotational rate less than 1250 rpm led to the formation of cracks on the tube surface in line with the tube circumference (Fig. 3a), presumably due to poor deformation characteristics of the material. Similarly, the FSBE process attempted with the tool rotation rate greater than 2250 rpm has led to non-uniform deformation due to the severe turbulence caused by the higher tool rotation rates. In addition to this, the higher tool rotation rates also caused a
Conclusions
In this paper, the effect of FSBE process parameters on the microstructure and mechanical properties of Mg tubes was investigated. The following conclusions can be drawn based on the results and observations achieved by this study:
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FSBE process was used to produce Mg tubes with superior mechanical strength by carefully selecting crucial FSBE process parameters such as tool rotation rate, dwell time, and tool feed rate. It was confirmed that the tool rotational speed has a major impact on the
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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