Microstructures and mechanical properties of friction stir welded joints of Zr-Ti alloy
- Li Y.J. ,
- Fu R.D. ,
- Du D.X. ,
- et al
- Li Y.J. ,
- Fu R.D. ,
- Du D.X. ,
- Sang D. ,
- Wang J. and
- Jing L.
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The weldability of zirconium-titanium alloy joints fabricated by means of friction stir welding (FSW) was investigated. Sheets (thickness 3 mm) of Zr-Ti alloy (Zr, 41%Ti, 4%Al, 3%V) underwent FSW with a tungsten-rhenium alloy (W, 25%Re) tool with an unthreaded pin (shoulder diameter 16 mm; pin length 3 mm) using the following process parameters: tool rotational speed 700 rev/min; welding speed 50 mm/min; tool tilt angle 2 degrees; shielding gas argon. The temperature in the HAZ was monitored; the hardness profile and microstructural phase composition of the welds were determined; the tensile strength of the joints was measured; and the microstructural texture and fracture surface morphology were characterised. A physical simulation with a similar welding thermal cycle was performed to shed light on an observed reduction in FSW joint hardness. The results are discussed with regard to the relationships between microstructure and mechanical properties of Zr-Ti alloy FSW joints.
10th International Symposium, 20-22 May 2014, Session 7B: Titanium, Paper 02
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