Effect of tool rotation rate on microstructure and mechanical properties of friction stir welded copper

An Mg-13.0Gd-1.6Ag-0.3Zr (wt.%) alloy casting was subjected to friction stir processing (FSP) at a tool rotation rate of 500 rpm and a traverse speed of 100 mm/min. The effects of FSP on the microstructures in different zones and mechanical properties were investigated. It indicates that FSP can result in significant break-up and dissolution of the coarse eutectic secondary phase‑‑Mg5Gd-type, and remarkable grain refinement (~2.5 µm) in stirring zone (SZ). Therefore, the mechanical properties of the casting can be significantly improved after FSP, i.e., it exhibits an ultimate tensile strength of 341 MPa and an elongation of 17 %.

Download Full-text

Effect of Rotation Rate on Microstructure and Mechanical Properties of Friction Stir Spot Welded DP780 Steel

Journal of Material Science and Technology ◽

10.1016/j.jmst.2015.10.009 ◽

2016 ◽

Vol 32 (4) ◽

pp. 326-332 ◽

Cited By ~ 30

Author(s):

G.M. Xie ◽

H.B. Cui ◽

Z.A. Luo ◽

W. Yu ◽

J. Ma ◽

...

Keyword(s):

Mechanical Properties ◽

Rotation Rate ◽

Friction Stir ◽

Microstructure And Mechanical Properties ◽

Dp780 Steel ◽

Spot Welded

Download Full-text

Study on the Joining of Titanium and Aluminum Dissimilar Alloys by Friction Stir Welding

The Open Materials Science Journal ◽

10.2174/1874088x01105010256 ◽

2011 ◽

Vol 5 (1) ◽

pp. 256-261 ◽

Cited By ~ 19

Author(s):

Yuhua Chen ◽

Changhua Liu ◽

Geping Liu

Keyword(s):

Titanium Alloy ◽

Shear Strength ◽

Aluminum Alloy ◽

Friction Stir Welding ◽

Welding Speed ◽

Rotation Rate ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Tool Rotation Rate ◽

Tool Rotation

Titanium alloy TC1 and Aluminum alloy LF6 were butt jointed and lap jointed by friction stir welding (FSW), and the influence of process parameters on formation of weld surface, cross-section morphology and strength were studied. The results show that, Titanium and Aluminum dissimilar alloy is difficult to be butt joined by FSW, and some defects such as cracks and grooves are easy to occur. When the tool rotation rate is 950 r/min and the welding speed is 118 mm/min, the tensile strength of the butt joint is 131MPa which is the highest. FSW is suitable for lap joining of TC1 Titanium alloy and LF6 Aluminum alloy dissimilar materials, an excellent surface appearance is easy to obtain, but the shear strength of the lap welding joint is not high. At the welding speed of 60 mm/min and the tool rotation rate of 1500 r/min, the lap joint has the largest shear strength of 48 MPa. At the welding speed of 150 mm/min and the tool rotation rate of 1500 r/min, crack like a groove occurs on the interface and the shear strength is zero.

Download Full-text

Effect of Welding Parameters on Microstructure and Tensile Properties of Friction Stir Welded 6061 AL Joints

Materials Science Forum ◽

10.4028/www.scientific.net/msf.618-619.41 ◽

2009 ◽

Vol 618-619 ◽

pp. 41-44 ◽

Cited By ~ 12

Author(s):

Ai Han Feng ◽

Dao Lun Chen ◽

Zong Yi Ma

Keyword(s):

Tensile Properties ◽

Welding Speed ◽

Rotation Rate ◽

Welding Parameters ◽

Nugget Zone ◽

Fine Needle ◽

Friction Stir ◽

Tool Rotation Rate ◽

The Relationship ◽

Tool Rotation

The present investigation is aimed at evaluating the influence of tool rotation rate and welding speed on the microstructure, tensile properties, and fracture mode of 6061 Al-T651 alloy after friction stir welding (FSW). TEM results revealed that in the nugget zone (NZ), FSW resulted in the dissolution of fine needle-shaped precipitates that previously existed in the base metal. At a given rotation rate of 1400rpm, the yield strength (YS) and ultimate tensile strength (UTS) of the welded joints increased with increasing welding speed from 200 to 600mm/min. However, the UTS of the joints was nearly independent of the rotation rate. Furthermore, the relationship between the hardness distribution and fracture location has also been identified.

Download Full-text

Effect of Tool Rotation Speed on the Microstructure and Mechanical Properties of Al-12.7 % Si Alloy by Friction Stir Processing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1001.155 ◽

2020 ◽

Vol 1001 ◽

pp. 155-160

Author(s):

Chun Xia Wang ◽

Sai Chang ◽

Gang Chen Sun ◽

Ze Qing Zhang

Keyword(s):

Mechanical Properties ◽

Rotation Speed ◽

Traverse Speed ◽

Friction Stir ◽

Tool Rotation Speed ◽

Microstructure And Mechanical Properties ◽

Increase With Increase ◽

Eutectic Si ◽

Tool Rotation ◽

Al Matrix

FSP was applied to the as-cast Al-12.7Si alloy at a traverse speed of 150mm/min and different rotation speeds (700rpm to 1000rpm). The coarse α-Al dendrites and eutectic Si phase can be refined by friction stir process. After FSP, Si particles are homogeneously distributed in the Al matrix with equaixed grains. Tool rotation speed has an effect on the microstructure and mechanical properties of the Al-12.7Si alloy. The size of Si particles decreases and that of the Al matrix grains increases with increase of the rotation speed. The microhardness values of the stir zone increase with increase of rotation speed. With rotation speed increases, the ultimate tensile strength is slightly increased and the elongation is greatly improved.

Download Full-text