Effect of Mg content on the minimum grain size of Al–Mg alloys obtained by friction stir processing

2011 ◽  
Vol 64 (4) ◽  
pp. 355-358 ◽  
Author(s):  
Taiki Morishige ◽  
Tomotake Hirata ◽  
Tokuteru Uesugi ◽  
Yorinobu Takigawa ◽  
Masato Tsujikawa ◽  
...  
Keyword(s):  
Grain Size ◽  
Friction Stir Processing ◽  
Mg Alloys ◽  
Friction Stir ◽  
Mg Content ◽  
Al Mg Alloys

Influence of Mg Content, Grain Size and Strain Rate on Mechanical Properties and DSA Behavior of Al-Mg Alloys Processed by ECAP and Annealing

2014 ◽  
Vol 794-796 ◽  
pp. 870-875 ◽  
Author(s):  
Min Zha ◽  
Yan Jun Li ◽  
Ragnvald H. Mathiesen ◽  
Christine Baumgart ◽  
Hans J. Roven
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strain Rate ◽  
Room Temperature ◽  
Uniform Elongation ◽  
Mg Alloys ◽  
Lower Strain Rate ◽  
Lower Strain ◽  
Mg Content ◽  
Al Mg Alloys

Ultrafine-grained (UFG) binary Al-xMg (x=1, 5 and 7 wt %) alloys were processed by equal channel angular pressing (ECAP) at room temperature via route Bccombined with inter-pass annealing. The effects of Mg content, grain size and strain rate on mechanical properties and dynamic strain aging (DSA) behaviour of the Al-Mg alloys upon tensile testing at room temperature were studied. An increase in Mg content from 5 to 7 wt % leads to a pronounced increase in strength and uniform elongation in both the as-homogenized and as-ECAP Al-Mg alloys. Thereby, the Al-7Mg alloy, either prior to or after ECAP processing, possess significantly higher strength and comparable or even higher uniform elongation than the more dilute Al-Mg alloys. However, the as-ECAP Al-Mg alloys exhibit significantly higher strength but little work hardening and hence rather limited uniform elongation. In general, decreasing grain size leads to significant increase in strength while dramatic decrease in ductility. Moreover, DSA serration amplitudes increase with reducing grain size in the micrometer range. However, the UFG Al-Mg alloys exhibit much less DSA effect than the micrometer scaled grain size counterparts, i.e. probably due to the high dislocation densities and special grain boundary features in the UFG materials. Also, the Al-Mg alloys, especially those with a UFG structure, exhibit higher strength and ductility at lower strain rate than at higher strain rate, due mainly to enhanced DSA effect and hence work hardening at a lower strain rate.

Enhancement of Formability in Magnesium Alloy AZ31B via Friction Stir Processing

2007 ◽  
Vol 539-543 ◽  
pp. 3775-3780 ◽  
Author(s):  
Yutaka S. Sato ◽  
A. Sasaki ◽  
A. Sugimoto ◽  
A. Honda ◽  
Hiroyuki Kokawa
Keyword(s):  
Grain Size ◽  
Friction Stir Processing ◽  
Base Material ◽  
Mg Alloys ◽  
Stir Zone ◽  
Mg Alloy ◽  
Homogeneous Microstructure ◽  
Friction Stir ◽  
Magnesium Alloy Az31b ◽  
Plane Strain Deformation

Mg alloy has a poor formability at room temperature because of lack of the active slip systems, but the grain refinement improves its ductility. Friction stir processing (FSP) can create homogeneous microstructure consisting of fine grains in Mg alloys, thus it would be expected that FSP enhances the formability of Mg alloys. In this study, multi-pass FSP was applied to Mg alloy AZ31B, and then formability of FSPed alloy was evaluated. Multi-pass FSP produced the fine recrystallized grains in Mg alloy. The stir zone exhibited larger fracture limit major strains than the base material under uniaxial tension and plane strain deformation, and these values increased with decreasing grain size. The stir zone having grain size of 2.9 μm showed the fracture limit major strains which are roughly as same as those of an annealed pure Al. The present study suggests that FSP is an effective method to enhance the formability of Mg alloys.

High strain rate superplasticity in continuous cast Al–Mg alloys prepared via friction stir processing

2009 ◽  
Vol 60 (10) ◽  
pp. 850-853 ◽  
Author(s):  
M.A. García-Bernal ◽  
R.S. Mishra ◽  
R. Verma ◽  
D. Hernández-Silva
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
High Strain ◽  
Mg Alloys ◽  
Continuous Cast ◽  
Friction Stir ◽  
Al Mg Alloys

A Novel Way to Fabricate Carbon Nanotubes Reinforced Copper Matrix Composites by Friction Stir Processing

2011 ◽  
Vol 391-392 ◽  
pp. 524-529 ◽  
Author(s):  
Wen Liang Chen ◽  
Chun Ping Huang ◽  
Li Ming Ke
Keyword(s):  
Carbon Nanotubes ◽  
Grain Size ◽  
Friction Stir Processing ◽  
Copper Matrix ◽  
Parent Material ◽  
Experimental Results ◽  
Matrix Composites ◽  
Small Decrease ◽  
Copper Matrix Composites ◽  
Friction Stir

Carbon nanotubes(CNTs) reinforced copper matrix composites were successfully produced by Friction Stir Processing (FSP). The effect of applying multiple FSP passes on the forming of composites was studied, the microstructure, microhardness and conductivity of the good forming composite were analyzed. The experimental results showed that CNTs uniformly distributed and good forming composite can be obtained by three FSP passes. Compared to the parent material, the grain size of the composite has significantly refined, and the microhardness of the composite has also greatly improved, but the conductivity of the composite has a small decrease.

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