TY - JOUR
T1 - Effect of rotational speed on microstructure and mechanical properties of Al-Ti friction stir welds with ultrasonic vibrations
AU - Chan, Luen Chow
AU - Yu, Mingrun
AU - Zhao, Hongyun
AU - Xu, Fei
AU - Chen, Tiehue
AU - Li, Zhou
AU - Song, Xiaoguo
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/11
Y1 - 2023/11
N2 - Ultrasonic vibration-enhanced friction stir welding (UVFSW) has been conducted on Al and Ti alloys at various rotational speeds with the aim of improving the microstructure and mechanical properties of the resultant welds. The application of UVFSW in Al-Ti welding could limit the formation of intermetallic compounds at Al-Ti interface as well as improve the weld’s appearance and microstructure. Ultrasonic vibrations reduced the sizes of flash and wave, indicating the improved material flowability in UVFSW. At the UVFSW interface, Ti substrate was partly fragmented, forming Ti particles at the interface, while the presence of Ti particles decreased with the increase of rotational speed. In lap shear tests, the ultimate load subjected to UVFSW welds was 4.40 kN and achieved at 1000 rpm, whereas the ultimate load of FSW welds was 2.52 kN at 1200 rpm. Shear dimple was the dominant characteristic of the fracture of UVFSW welds, whereas FSW welds mainly exhibited faceted characteristics in fracture.
AB - Ultrasonic vibration-enhanced friction stir welding (UVFSW) has been conducted on Al and Ti alloys at various rotational speeds with the aim of improving the microstructure and mechanical properties of the resultant welds. The application of UVFSW in Al-Ti welding could limit the formation of intermetallic compounds at Al-Ti interface as well as improve the weld’s appearance and microstructure. Ultrasonic vibrations reduced the sizes of flash and wave, indicating the improved material flowability in UVFSW. At the UVFSW interface, Ti substrate was partly fragmented, forming Ti particles at the interface, while the presence of Ti particles decreased with the increase of rotational speed. In lap shear tests, the ultimate load subjected to UVFSW welds was 4.40 kN and achieved at 1000 rpm, whereas the ultimate load of FSW welds was 2.52 kN at 1200 rpm. Shear dimple was the dominant characteristic of the fracture of UVFSW welds, whereas FSW welds mainly exhibited faceted characteristics in fracture.
KW - Al
KW - Friction stir welding
KW - Mechanical properties
KW - Microstructure
KW - Ti
KW - Ultrasonic vibrations
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85167779883&origin=inward
U2 - 10.1016/j.jmatprotec.2023.118119
DO - 10.1016/j.jmatprotec.2023.118119
M3 - Journal article
SN - 0924-0136
VL - 320
JO - Journal of Materials Processing Tech.
JF - Journal of Materials Processing Tech.
M1 - 118119
ER -