EFFECT OF FRICTION STIR PROCESSING CONDITION ON TENSILE PROPERTIES OF Al-7Si-0.3Mg CAST ALLOY

2012 ◽  
Vol 06 ◽  
pp. 397-400
Author(s):  
Z.W. Chen
Keyword(s):  
Tensile Properties ◽  
Friction Stir Processing ◽  
Material Flow ◽  
Rotation Speed ◽  
Cast Alloy ◽  
Processing Condition ◽  
Flow Mechanism ◽  
Friction Stir ◽  
High Elongation ◽  
High Rotation Speed

Multipass friction stir processing (FSP) of cast Al -7 Si -0.3 Mg alloy was conducted and FS microstructures were related to the fracture paths and tensile properties. It has been found that high rotation speed (ω) FS caused alignments of Si particles, providing easy paths for fracturing during loading and resulting in low elongation and lower UTS values of the processed alloy. The material flow mechanism during FS leading to the alignments is suggested. This suggested mechanism has been verified after conducting FS experiments using a lower ω value which eliminated Si particle alignments and thus allowed high elongation and UTS values to be attained.

Microstructural Evolution in Various Regions of Stir Zone during Friction Stir Processing of Al-7Si-0.3Mg Cast Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 962-965 ◽  
Author(s):  
Zhan W. Chen ◽  
Song Cui ◽  
Wei Gao ◽  
Tian Ping Zhu
Keyword(s):  
Microstructural Evolution ◽  
Friction Stir Processing ◽  
Material Flow ◽  
Rotation Speed ◽  
Cast Alloy ◽  
Stir Zone ◽  
Forward Speed ◽  
Structural Components ◽  
Friction Stir

Castings may be used more as structural components if friction stir (FS) processing could refine the microstructures satisfactorily. For this, material flow and the formation of various microstructural regions during FS were studied. It was found that -Al dendrites and eutectic Al-Si were sheared into the thread spaces and the microstructures were significantly modified and refined. Material merely dragged into the FS zone remains microstructurally segregated. The volume of each flow was affected by rotation speed and forward speed and the reason for this is explained. Finally, textures determined together with the strain values estimated are presented to discuss further the microstructual development in various stir zones.

Tensile Fracture Behavior of Friction Stir Processed Al-7Si-0.3Mg Cast Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 971-976 ◽  
Author(s):  
Zhan W. Chen ◽  
Francis Abraham ◽  
Joshua Walker
Keyword(s):  
Fracture Behavior ◽  
Rotation Speed ◽  
Cast Alloy ◽  
Tensile Elongation ◽  
Tensile Fracture ◽  
Cast Material ◽  
Friction Stir ◽  
Cast Alloys ◽  
High Rotation Speed ◽  
Zone Pass

Elimination of porosity and refinement of the normally coarse cast microstructure ofaluminium cast alloys by the intensive plastic deformation during friction stir processing (FSP) iswell known. However less is known about the mechanical behavior of the FS processed regionwhich contains zone/pass boundaries and macro/microstructure segregations. In the present study ofFS processed cast Al-7Si-0.3Mg alloy, microstructures featuring the deformed α-Al, fragmented Siparticles and their distribution in the processed region were related to the fracture paths duringtensile testing. It has been found that under the condition of a high rotation speed and minimum pinoverlap there is a strong upward flow of deformed cast material in thermomechanial affected zone.The arrays of Si particles in that flow have provided favorable paths for crack propagation duringtensile testing. As a result, tensile elongation and thus UTS values are low. The mechanism of thatupward flow and FSP conditions for reducing the flow and thus for improving properties of theprocessed region are discussed.

Friction Stir Processing of Cast Alloy 718

2016 ◽  
pp. 505-511 ◽  
Author(s):  
Bharat K. Jasthi ◽  
Edward Chen ◽  
Brahmanandam Kaligotla ◽  
Todd Curtis ◽  
Michael West ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Cast Alloy ◽  
Alloy 718 ◽  
Friction Stir ◽  
Cast Alloy 718
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