Microstructure and mechanical properties of 1350 industrial pure aluminum and pure copper joints prepared by friction stir welding

作者：Li, Xia-Wei; Zhang, Da-Tong; Qiu, Cheng; Zhang, Wen

来源：Materials Science and Technology, 2011, 19(SUPPL. 1): 13-18.

• 1350 industrial pure aluminums
• Deformed microstructure
• Dissimilar welding
• Fine equiaxed grains
• Friction stir welding(FSW)
• Microstructure and mechanical properties
• Pure copper
• Thermomechanically affected zones

Friction stir welding(FSW) was used to join 1350 industrial pure aluminum and pure copper sheet with a thickness of 3 mm, microstructure and mechanical properties of the dissimilar weld was investigaged. The results showed that sound weld was obtained at a rotation speed of 1200 rpm and welding speed of 80 mm/min when aluminum sheet was placed at the retreating side. The joints was composed of four distinct zones, i. e. parent metal(PM), heat affected zone (HAZ), thermo-mechanically affected zone (THAZ) and stir zone(SZ) in both aluminum and copper side. Compared with PM, the grains in HAZ grew course, while a deformed microstructure existed in TMAZ. Microstructure of SZ consists of fine equiaxed grains due to the dynamic recrystallization. XRD result indicated that no intermetallic compound phase was found in SZ. The UTS and elongation of the dissimilar welds was 73 MPa and 1.7%, respectively. The fracture of tensile specimen located in the SZ close to the aluminum side. SEM fractography showed that most of the fracture surface was flat, while a few dimples could be seen, indicating the fracture mode of the joint was brittle fracture.

• 出版日期2011-12
• 单位华南理工大学