Superplasticity Mg Alloy Fabricated by Friction Stir Processing

2014 ◽  
Vol 941-944 ◽  
pp. 93-96 ◽  
Author(s):  
Shang Xiong Sheng ◽  
Yan Li Guo ◽  
Shou Fa Liu ◽  
Song Lin Wu
Keyword(s):  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Compressive Strain ◽  
Grain Boundary Sliding ◽  
Processing Technique ◽  
Friction Stir ◽  
Az61 Magnesium Alloy ◽  
Dominant Deformation Mechanism ◽  
Boundary Sliding ◽  
State Processing

In this research, one solid state processing technique, friction stir processing, is applied to modify the AZ61 magnesium alloy billet. The FSP modified AZ61 alloy could be refined to 3-8 μm via the dynamic recrystallization during processing. The AZ61 magnesium alloy billet with 75μm grain size could be refined to about 7.5μm by four-pass friction stir processing. The hardness of the stirred zone could increase to around 70-80 after friction stir processing, and after a further compressive strain of about 3% could raise the hardness to 81. The ductility of the weld direction specimens of the modified alloy could have a 235% elongation at 300°C and 1x10-4 s-1. The grain boundary sliding (GBS) might be the dominant deformation mechanism during superplastic deformation.

Experimental investigation and modelling of Friction Stir Processing of cast aluminium alloy AlSi9Mg

2013 ◽  
Vol 61 (4) ◽  
pp. 893-904 ◽  
Author(s):  
M.S. Węglowski ◽  
S. Dymek ◽  
C.B. Hamilton
Keyword(s):  
Friction Stir Processing ◽  
Processing Technique ◽  
Second Phase ◽  
Surface Layers ◽  
Temperature Estimation ◽  
Transmission Microscopy ◽  
Friction Stir ◽  
Microscopy Investigation ◽  
Second Phase Particles ◽  
State Processing

Abstract Friction Stir Processing (FSP) is a novel solid state processing technique which can be used for microstructural modification of surface layers in metallic materials. This paper analyzes the effects of FSP process parameters on spindle torque acting on the tool and on the tool temperature. It has been shown that an increase in the rotational speed brings about a decrease in the torque and an increase of temperature. For temperature estimation in the stir zone a numerical model was applied, while for predicting a relationship between the spindle torque acting on the tool, rotational and travelling speeds and the down force, the artificial neural networks approach was employed. Light and electron (scanning and transmission) microscopy investigation showed that the FSP process reduces porosity and produces a more uniform distribution of second-phase particles.

Cavitation during grain-boundary-sliding deformation in an AZ61 magnesium alloy

2008 ◽  
Vol 497 (1-2) ◽  
pp. 139-146 ◽  
Author(s):  
Yorinobu Takigawa ◽  
Juan Velázquez Aguirre ◽  
Eric M. Taleff ◽  
Kenji Higashi
Keyword(s):  
Magnesium Alloy ◽  
Grain Boundary ◽  
Grain Boundary Sliding ◽  
Az61 Magnesium Alloy ◽  
Boundary Sliding

scholarly journals Stretch Formability of an AZ61 Alloy Plate Prepared by Multi-Pass Friction Stir Processing

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3168
Author(s):  
Xicai Luo ◽  
Haolin Liu ◽  
Limei Kang ◽  
Jielin Lin ◽  
Yifei Liu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Friction Stir Processing ◽  
Room Temperature ◽  
Applied Load ◽  
Alloy Plate ◽  
Friction Stir ◽  
Az61 Magnesium Alloy ◽  
Az61 Alloy ◽  
Stretch Formability

The stretch formability behavior of an AZ61 magnesium alloy plate produced by multi-pass friction stir processing (M-FSP) was investigated, with the applied load vs. displacement curves recorded during Erichsen cupping tests at different punching speeds at room temperature. The stretch formability of M-FSP AZ61 magnesium alloy was significantly enhanced, compared with that of its cast counterpart. The highest Erichsen index of 3.7 mm was obtained at a punching speed of 0.1 mm/min. The improved stretch formability was mainly attributed to the grain refinement stemming from the M-FSP and the presence of extension twinning to accommodate deformation during Erichsen cupping testing.

scholarly journals Development and characterization of WE43/nano-TiC surface composite by friction stir processing technique

2020 ◽  
Vol 53 (3-4) ◽  
pp. 730-741
Author(s):  
Shivali Singla ◽  
Amardeep Singh Kang ◽  
TS Sidhu
Keyword(s):  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Corrosion Behaviour ◽  
Research Work ◽  
Surface Hardness ◽  
Maximum Level ◽  
Processing Technique ◽  
Friction Stir ◽  
Pin Geometry ◽  
Tool Pin

In present research work, an attempt has been made on the development of titanium carbide–reinforced magnesium-based surface composites through friction stir processing technique. Particularly, attempt has been made to observe the influence of input processing conditions, namely tools-pin geometry, travel speed, and rotational speed for the mechanical importance (surface hardness and elastic modulus) of the developed composites. Further, the, incurred modifications in the metallurgical characteristics and corrosion behaviour of the developed composites have also been analysed through microscopic and scanning electron microscopy, and immersion fluid test, respectively. It has been found that the quality characteristics of the composites have been greatly influenced by the selected range of input variables. As noticed, the grain size of the magnesium alloy has been significantly reduced from 22.42 to 6.6 µm. Furthermore, the maximum level of the micro-hardness (180 HV0.3) of the processed composite with square-shaped tool-pin geometry. Moreover, the degradation rate of the processed composite is found to be 45% lesser than the unprocessed magnesium alloy.

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