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CHEN Jiqiang, YIN Zhimin, HE Zhenbo, PENG Yongyi. Microstructure and mechanical properties of friction stir welding joints of AlZn-Mg-Sc-Zr Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (10): 68-72.
Citation: CHEN Jiqiang, YIN Zhimin, HE Zhenbo, PENG Yongyi. Microstructure and mechanical properties of friction stir welding joints of AlZn-Mg-Sc-Zr Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (10): 68-72.

Microstructure and mechanical properties of friction stir welding joints of AlZn-Mg-Sc-Zr Alloy

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  • Received Date: January 02, 2009
  • The joints of friction stir welding of Al-Zn-Mg-Sc-Zr alloy were investigated, and the mechanical properties and microstructures of the joint were analysed.The results show that the distribution of micro-hardness in the cross-section presents a trend of high-low-high-low-high, the maximal hardness appears in the region of the weld nugget and the lowest hardness in head-affected zone(HAZ), and the welding coefficient reaches 0.90.The weld nugget has a dynamic recrystallized, fine isometric crystal structure with the size of 1-2 μm, and the precipitation phases in the base metal are melted and broken up to small round particles;the thermo-mechanically affected zone has a highly curved structure, and the precipitation phases transform to club-shaped;the size of grains in HAZ is larger than that in the base metal.The tensile samples of welding joint break in the HAZ.

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