Enhanced mechanical properties of tungsten inert gas welded AZ31 magnesium alloy joint using two-pass friction stir processing with rapid cooling
- Xu N. and
- Bao Y.F.
- Xu N. and
- Bao Y.F.
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Description
AZ31 magnesium alloy sheets (thickness 3 mm) were joined by TIG welding and the effect of two run rapid cooling friction stir processing (RC-FSP) on welded joint microstructure and mechanical properties was investigated. TIG welding was undertaken at a current of 90 A, voltage of 10 V and welding speed of 15 mm/s, while RC-FSP was conducted at a rotational speed of 600 rpm, travel speed of 400 mm/min and tool tilt angle of 2.5 deg. Microstructures were observed by optical microscopy, SEM and electron backscattering diffraction. Tensile tests were carried out using an Instron type testing machine at a crosshead speed of 1 mm/min. Dissolution of the coarse eutectic beta-Mg17Al12 phase, stir zone grain refinement and tensile strength enhancement after RC-FSP are discussed.
11th International Symposium, 17-19 May 2016, Session 4B: FSP, Paper 04
Subjects
- Nonferrous
- Material
- Magnesium and Mg alloys
- Surface engineering
- Process
- Friction stir processing
- Arc welding
- Welding
- TIG welding
- Strength
- Mechanical properties
- Properties
- Ultimate tensile strength
- Microstructure
- Grain
- Weld zone
- Weld
- Dynamically recrystallised zone
- Process conditions
- Thermomechanically affected zone
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