Friction Stir Processing: A New Grain Refinement Technique to Achieve High Strain Rate Superplasticity in Commercial Alloys

2001 ◽  
Vol 357-359 ◽  
pp. 507-514 ◽  
Author(s):  
Rajiv S. Mishra ◽  
Murray W. Mahoney
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Grain Refinement ◽  
Friction Stir Processing ◽  
High Strain ◽  
Friction Stir

High-Strain-Rate Superplasticity in Mg-Y-Nd Alloy Prepared by Submerged Friction Stir Processing

2015 ◽  
Vol 18 (2) ◽  
pp. 312-318 ◽  
Author(s):  
Genghua Cao ◽  
Datong Zhang ◽  
Fang Chai ◽  
Wen Zhang ◽  
Cheng Qiu
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
High Strain ◽  
Friction Stir

scholarly journals High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1573
Author(s):  
Marta Álvarez-Leal ◽  
Fernando Carreño ◽  
Alberto Orozco-Caballero ◽  
Pilar Rey ◽  
Oscar A. Ruano
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
High Strain ◽  
Flow Behavior ◽  
Traverse Speed ◽  
Grain Boundary Sliding ◽  
Coarse Grained ◽  
Friction Stir ◽  
Ultrafine Grained

Friction stir processing (FSP) was used on coarse-grained WE54 magnesium alloy plates of as-received material. These were subjected to FSP under two different cooling conditions, refrigerated and non-refrigerated, and different severe processing conditions characterized by low rotation rate and high traverse speed. After FSP, ultrafine equiaxed grains and refinement of the coarse precipitates were observed. The processed materials exhibited high resistance at room temperature and excellent superplasticity at the high strain rate of 10−2 s−1 and temperatures between 300 and 400 °C. Maximum tensile superplastic elongation of 726% was achieved at 400 °C. Beyond 400 °C, a noticeable loss of superplastic response occurred due to a loss of thermal stability of the grain size. Grain boundary sliding is the operative deformation mechanism that can explain the high-temperature flow behavior of the ultrafine grained FSP-WE54 alloy, showing increasing superplasticity with increasing processing severity.

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