4.5 Article

Mechanical Properties and Microstructure of TIG and FSW Joints of a New Al-Mg-Mn-Sc-Zr Alloy

Journal

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 25, Issue 4, Pages 1249-1256

Publisher

SPRINGER
DOI: 10.1007/s11665-016-1942-6

Keywords

aluminum alloys; FSW; mechanical property; microstructure; TIG

Funding

  1. National General Pre-research Project of China [51312010402]
  2. China Postdoctoral Science Foundation [2014M552149]
  3. Young Talents Lift Engineering Project
  4. Hunan Province Science and Technology Innovation Talent Plan Project [2015RS4001]

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A new Al-5.8%Mg-0.4%Mn-0.25%Sc-0.10%Zr (wt.%) alloy was successfully welded by tungsten inert gas (TIG) and friction stir welding (FSW) techniques, respectively. The mechanical properties and microstructure of the welded joints were investigated by microhardness measurements, tensile tests, and microscopy methods. The results show that the ultimate tensile strength, yield strength, and elongation to failure are 358, 234 MPa, and 27.6% for TIG welded joint, and 376, 245 MPa and 31.9% for FSW joint, respectively, showing high strength and superior ductility. The TIG welded joint fails in the heat-affected zone and the fracture of FSW joint is located in stirred zone. Al-Mg-Mn-Sc-Zr alloy is characterized by lots of dislocation tangles and secondary coherent Al-3(Sc,Zr) particles. The superior mechanical properties of the TIG and FSW joints are mainly derived from the Orowan strengthening and grain boundary strengthening caused by secondary coherent Al-3(Sc,Zr) nano-particles (20-40 nm). For new Al-Mg-Mn-Sc-Zr alloy, the positive effect from secondary Al-3(Sc, Zr) particles in the base metal can be better preserved in FSW joint than in TIG welded joint.

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