Cavity growth rate in superplastic 5083 Al and AZ31 Mg alloys

2004 ◽  
Vol 19 (11) ◽  
pp. 3382-3388 ◽  
Author(s):  
Yasumasa Chino ◽  
Hajime Iwasaki ◽  
Mamoru Mabuchi
Keyword(s):  
Growth Rate ◽  
Grain Boundary ◽  
Cavity Growth ◽  
Grain Boundary Sliding ◽  
Mg Alloy ◽  
Al Alloy ◽  
Az31 Mg Alloy ◽  
Boundary Sliding ◽  
Cavity Growth Rate ◽  
5083 Al Alloy

The plasticity-controlled growth rate of cavities during superplastic deformationwas statistically investigated for 5083 Al alloy and AZ31 Mg alloy. When the cavity growth rate was evaluated on the basis of macroscopic strain calculated using the displacement of the specimen, the growth rate for the Al alloy was larger than thatfor the Mg alloy. However, the growth rate of the Al alloy was in agreement withthat of the Mg alloy when the cavity growth rate was evaluated on the basis of the microscopic strain due to grain boundary sliding. The results obtained lead to two conclusions: (i) the rate of cavity growth is not affected by the kind of materials,that is, the nature of the grain boundary, and (ii) the microscopic strain due to grain boundary sliding should be used to evaluate exactly the rate of cavity growth for superplastic deformation.

An Investigation of Cavity Growth Rate in Superplastic Al and Mg Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2945-2948 ◽  
Author(s):  
Mamoru Mabuchi ◽  
Yasumasa Chino ◽  
Hajime Iwasaki
Keyword(s):  
Growth Rate ◽  
Volume Fraction ◽  
Cavity Growth ◽  
Mg Alloy ◽  
Al Alloy ◽  
Cavity Volume ◽  
Superplastic Behavior ◽  
Fine Grained ◽  
Cavity Growth Rate ◽  
5083 Al Alloy

Fine-grained 5083 Al alloy and AZ91 Mg alloy showed superplastic behavior. The plasticitycontrolled growth rates of cavities during superplastic deformation for the Al alloy and Mg alloy were investigated. The cavity volume fraction for the Mg alloy was larger than that for the Al alloy. However, the cavity growth rate for the Mg alloy was lower than that for the Al alloy.

Deformation Behavior of Fine Grained Al-Mg Alloy under Biaxial Stress

2006 ◽  
Vol 503-504 ◽  
pp. 475-480 ◽  
Author(s):  
Masafumi Noda ◽  
Kunio Funami
Keyword(s):  
Grain Boundary ◽  
Tensile Deformation ◽  
Grain Boundary Sliding ◽  
Biaxial Stress ◽  
Mg Alloy ◽  
Strain Rates ◽  
Fine Grained ◽  
Biaxial Tensile ◽  
Wide Range ◽  
Boundary Sliding

The grain boundary sliding and the formation of slipped bands and cavitations during biaxial tensile deformation were examined in fine grained Al-Mg alloy. Biaxial tensile testing was conducted with cruciform specimens at initial strain rates of 10-4 to 101s-1. It was found that at the same equivalent strain conditions, the number of cavities under biaxial tension is significantly greater than that under uniaxial tension. A greater prevalence of slipped bands and grain separations were clearly observed under biaxial stress than under uniaxial stress. It was suggested that development of slipped bands resulted from the formation of elongated cavities and multiple deformed bands under biaxial stress. Additionally, the m-value under biaxial stress remained at about 0.3 over a wide range of strain rates. The effects of grain separation and formation of cavities were related to the motion of grain boundary sliding, grain size and loading conditions.

Blow Forming of Recycled 5083 Al Alloy and AZ31 Mg Alloy by Solid State Recycling

2005 ◽  
pp. 2919-2922
Author(s):  
Yasumasa Chino ◽  
Mamoru Mabuchi ◽  
Tetsuji Hoshika ◽  
Jae Seol Lee ◽  
Koji Shimojima ◽  
...  
Keyword(s):  
Solid State ◽  
Mg Alloy ◽  
Al Alloy ◽  
Az31 Mg Alloy ◽  
5083 Al Alloy

Effect of Initial Microstructure on the Compatibility of Rapidly Solidified Ti-Rich TiAl Powder

1996 ◽  
Vol 460 ◽  
Author(s):  
M. Nishida ◽  
A. Chiba ◽  
Y. Morizono ◽  
T. Kai ◽  
J. Sugimoto
Keyword(s):  
Grain Boundary ◽  
Orientation Relationship ◽  
Hot Pressing ◽  
Dendritic Structure ◽  
High Energy ◽  
Grain Boundary Sliding ◽  
Al Alloy ◽  
Initial Microstructure ◽  
Boundary Sliding ◽  
Rapidly Solidified

ABSTRACTInitial microstructure dependence of compactibility at elevated temperature in rapidly solidified Ti-rich TiAl alloy powders produced by plasma rotating electrode process (PREP) has been investigated. There were two kinds of powders with respect to the microstructure. The first one had a surface relief of a martensitic phase, which was referred as M powder. The second one had a dendritic structure, which was referred as D powder. α2+γ microduplex and α2/γ lamellar structures were formed in Mand D powders of the Ti-40 at%Al alloy by heat treatment at 1273 K, respectively. The microduplex structure consisted of γ precipitate in the twin related α2 matrix with the usual orientation relationship. It was difficult to compact the D powder by hot pressing at 1273 K under 50 MPa for 14.4 ks. On the other hand, the M powder was compacted easily by hot pressing with the same condition. The twin related α2 and α2 boundary changed to random ones and the α2 and γ phases were lost the usual orientation relationship in the duplex structure during the hot pressing. In other words, the low energy boundaries were changed to the high energy ones suitable for grain boundary sliding. Dislocations were scarcely observed inside of both the α2 and γ crystal grains. It was concluded that the grain boundary sliding was a predominant deformation mode in the M powder during the hot pressing. D and M powders in Ti-45 and 47 at%Al alloys showed the same tendency as those in Ti-40 at%Al alloy during hot pressing.

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