Effects of dwell time on the microstructures and mechanical properties of water bath friction stir spot-welded AZ31 magnesium alloy joints

2015 ◽  
Vol 82 (1-4) ◽  
pp. 75-83 ◽  
Author(s):  
Xiong Xie ◽  
Jun Shen ◽  
Fubao Gong ◽  
Dong Wu ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Dwell Time ◽  
Water Bath ◽  
Az31 Magnesium Alloy ◽  
Friction Stir ◽  
Microstructures And Mechanical Properties ◽  
Spot Welded

Effect of Enhanced Cooling on the Microstructure and Mechanical Properties of Friction Stir Spot-Welded AZ31 Magnesium Alloy

2016 ◽  
Vol 850 ◽  
pp. 784-789
Author(s):  
Song Lin Chen ◽  
Da Tong Zhang
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Cooling Water ◽  
Stir Zone ◽  
Az31 Magnesium Alloy ◽  
Air Cooling ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
Average Grain Size ◽  
Spot Welded

AZ31 magnesium alloy was friction stir spot welded in air and cooling in water. The effect of the enhanced cooling rate on the microstructure and mechanical properties of the joint was analyzed. The results showed that flowing water had obvious cooling effect instantaneously, which significantly restrained the growth of dynamic recrystallized grains. The average grain size in stir zone was 1.3μm in cooling water condition, which is far smaller than that of the joint prepared in air cooling condition. Under the condition of enhanced cooling, the microhardness in stir zone significantly increased, the ultimate tensile load (~ 3.99kN) increased by 15.7%, and the tensile deformation value (~ 3.65 mm) increased by 62.2%. Dimples in SEM fracture morphologies indicated the better plastic deformation capacity of joints prepared by cooling water, which failed through a mixture mode of ductile and brittle fracture.

Effects of Extrusion–Shear Process Conditions on the Microstructures and Mechanical Properties of AZ31 Magnesium Alloy

2016 ◽  
Vol 35 (10) ◽  
pp. 967-972
Author(s):  
H.J. Hu ◽  
Y.Y. Li ◽  
X. Wang ◽  
D.F. Zhang ◽  
M.B. Yang
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Microstructure Analysis ◽  
Az31 Magnesium Alloy ◽  
Process Conditions ◽  
Compression Tests ◽  
Billet Temperature ◽  
Direct Extrusion ◽  
Shear Process ◽  
Microstructures And Mechanical Properties

AbstractIn this paper, the effects of extrusion–shear (ES) on the microstructures and mechanical properties of AZ31 magnesium alloy has been studied, which has been achieved by conducting a lot of experiments and tests, including ES process, direct extrusion with different billet temperatures, microstructure analysis, hardness test, tensile & compression tests. The results show that the ES-processed rods has higher strengths (yield strength and tensile strength) than the direct extrusion ones with the same billet temperature, which contributed to their lower averaged grain size obtained from microstructure analysis according to Hall–Petch relation. Besides, the hardness of ES-processed AZ31 magnesium alloy decreases with the increasing of billet temperature. By comparing the two processes, it can be seen that the ES process could refine the microstructure and improve the mechanical properties of magnesium alloy.

Effect of Rotational Speed and Dwell Time on Mechanical Properties of Dissimilar AA1050-AA3105 Friction Stir Spot Welded Joints*

2014 ◽  
Vol 56 (10) ◽  
pp. 818-825
Author(s):  
Hakan Aydin ◽  
Oguz Tuncel ◽  
Celalettin Yuce ◽  
Mumin Tutar ◽  
Nurettin Yavuz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Rotational Speed ◽  
Dwell Time ◽  
Friction Stir ◽  
Spot Welded
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