scholarly journals High Temperature Deformation of Beta Titanium-Aluminum Solid Solution Alloys

1989 ◽  
Vol 30 (12) ◽  
pp. 1027-1032 ◽  
Author(s):  
Masahiro Seki ◽  
Hiroshi Oikawa
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Beta Titanium ◽  
Titanium Aluminum ◽  
Aluminum Solid Solution

Superplastic Elongation through Deformation Mechanism Transition during High-Temperature Deformation in Thermally Unstable Fine-Grained Aluminum Solid Solution Alloy

2016 ◽  
Vol 723 ◽  
pp. 21-26
Author(s):  
Tsutomu Ito ◽  
Takashi Mizuguchi
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Deformation Mechanism ◽  
Solute Drag ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Solid Solution Alloy ◽  
Fine Grained ◽  
Aluminum Solid Solution ◽  
Mechanism Transition

In this study, the superplastic behavior on a fine-grained aluminum solid solution alloy consisting of thermally unstable microstructures was investigated. In order to obtain the fine-grained microstructure, friction stir processing (FSP) was applied to a commercial 5083 aluminum alloy. An equiaxial fine-grained microstructure of 7.8 mm was obtained after FSP, but this microstructure was thermally unstable at high temperatures. Commonly, for fine-grained superplasticity to occur (or to continue grain boundary sliding (GBS)), it is necessary to keep the fine-grained microstructure to less than 10 mm during the high-temperature deformation. However, in this study, a large elongation of over 200% was observed at high temperatures in spite of the occurrence of grain growth. From the microstructural observations, it was determined that the fine-grained microstructure was maintained until the early stage of deformation, but the transgranular deformation was observed at a strain of over 100%. The microstructural feature of the abovementioned transgranular deformation is similar to the deformation microstructure of the solute drag creep occurring in "Class I"-type solid solution alloys. This indicates that the deformation mechanism transition from GBS to the solute drag creep occurred during high-temperature deformation. Here, the possibility of occurrence of the superplastic elongation through deformation mechanism transition is discussed as a model of the thermally unstable aluminum solid solution alloy.

Dislocation Creep in Al-22.2, 53.6 and 101 at.ppm Fe Solid Solution Alloys

2014 ◽  
Vol 922 ◽  
pp. 749-754
Author(s):  
K. Takeshima ◽  
Tokuteru Uesugi ◽  
Yorinobu Takigawa ◽  
Kenji Higashi
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Creep Resistance ◽  
Dislocation Creep ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Stress Range ◽  
Creep Tests ◽  
Ultra High Purity ◽  
Dominant Deformation Mechanism

Creep tests of ultra-high-purity (99.999%) Al and Al-22.2, 53.6, 101 at.ppm Fe solid solution alloys were conducted at 773 K in the stress range of 2-6 MPa in order to investigate effect of solute Fe on high temperature deformation of Al. Creep resistance was enhanced by addition of Fe in solid solution. The stress exponents of the samples exhibited values of about 5, which indicate that climb-controlled dislocation creep was dominant deformation mechanism. It could be suggested that Fe atoms segregating in dislocations due to the strong interaction between solute Fe atoms and the dislocation enhanced the creep resistance.

High-temperature deformation of polycrystalline beta titanium

1985 ◽  
Vol 19 (7) ◽  
pp. 825-828 ◽  
Author(s):  
Hiroshi Oikawa ◽  
Kazumi Nishimura ◽  
M.X. Cui
Keyword(s):  
High Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Beta Titanium

Texture Formation during High Temperature Deformation of Al-3mass%Mg Solid Solution

2005 ◽  
Vol 495-497 ◽  
pp. 579-584 ◽  
Author(s):  
Kazuto Okayasu ◽  
Hiroshi Fukutomi
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Strain Rate ◽  
Deformation Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Strain Rates ◽  
Texture Formation ◽  
Compression Tests ◽  
Temperature Strain

Uniaxial compression tests were conducted on Al-3mass%Mg alloy under various temperatures and strain rates. High temperature yielding was observed at the temperatures higher than 623K. Texture examination elucidated that fiber textures are constructed in all the deformation conditions examined in this study. It was found that the kinds and intensities of texture components varied depending on deformation temperature, strain rate and the amount of strain.

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