In-situ synthesis and characterization of Al2O3nanostructured whiskers in Ti–Al intermetallic matrix composites

2010 ◽  
Vol 101 (10) ◽  
pp. 1241-1244
Author(s):  
Taotao Ai ◽  
Yingtang Zhang ◽  
Xiaoming Feng ◽  
Wenhu Li
Keyword(s):  
In Situ Synthesis ◽  
Synthesis And Characterization ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites

scholarly journals Rapid Synthesis of Metallic Reinforced in Situ Intermetallic Composites in Ti-Al-Nb System via Resistive Sintering

2018 ◽  
Vol 16 (1) ◽  
pp. 869-875
Author(s):  
Mediha İpek ◽  
Tuba Yener ◽  
Gözde Ç. Efe ◽  
Ibrahim Altınsoy ◽  
Cuma Bindal ◽  
...  
Keyword(s):  
High Hardness ◽  
Processing Technique ◽  
Metallic Phase ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
One Step ◽  
Intermetallic Matrix Composites ◽  
Hardness Values ◽  
A Current

AbstractIntermetallics are known as a group of materials that draws attention with their features such as ordered structure, high temperature resistance, high hardness and low density. In this paper, it is aimed to obtain intermetallic matrix composites and also to maintain some ductile Nb and Ti metallic phase by using 99.5% purity, 35-44 μm particle size titanium, niobium and aluminium powders in one step via recently developed powder metallurgy processing technique - Electric current activated/assisted sintering system (ECAS). In this way, metallic reinforced intermetallic matrix composites were produced. Dominant phases of TiAl3 and NbAl3 which were the first compounds formed between peritectic reaction of solid titanium, niobium and molten aluminum in Ti-Al-Nb system during 10, 30 and 90 s for 2000 A current and 1.5-2.0 voltage were detected by XRD and SEM-EDS analysis. Hardness values of the test samples were measured by Vickers indentation technique and it was detected that the hardnesses of intermetallic phases as 411 HVN whereas ductile metallic phase as 120 HVN.

scholarly journals In situ synthesis and characterization of sulfonic acid functionalized hierarchical silica monoliths

2020 ◽  
Vol 96 (1) ◽  
pp. 67-82
Author(s):  
Richard Kohns ◽  
Ralf Meyer ◽  
Marianne Wenzel ◽  
Jörg Matysik ◽  
Dirk Enke ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
In Situ Synthesis ◽  
Synthesis And Characterization ◽  
Silica Monoliths

Microstruciture and Properties of Intermetallic Matrix Composites Produced by Reaction Synthesis

1994 ◽  
Vol 350 ◽  
Author(s):  
D. E. Alman ◽  
J. A. Hawk ◽  
C. P. Dogan ◽  
M. Ziomek-Moroz ◽  
A. V. Petty
Keyword(s):  
Alkaline Solutions ◽  
Reaction Synthesis ◽  
Matrix Composites ◽  
Reaction Products ◽  
Hot Press ◽  
Press Temperature ◽  
Intermetallic Matrix ◽  
Microstructural Evaluation ◽  
Intermetallic Matrix Composites

AbstractIn this US Bureau of Mines study, a variety of TiAl based composites were produced in situ by reaction synthesis. Mixtures of elemental Ti, Al and B and Ti, Al, and Si powders were reactive hot-pressed to form TiAl reinforced with 10, 20, 25 or 60 vol. pct. TiB2 or Ti5Si3. Microstructural evaluation of the resultant composites confirmed that the reaction products were primarily TiAl and TiB2 or Ti5S3, with a small amount of Ti3Al. The hot-press temperature and pressure had a significant effect on the density of the composites. In general, higher temperatures and initiating the reaction under pressure promoted dense composites. Room temperature biaxial flexure strength tests indicated that the addition of the reinforcing phases can improve the strength of TiAl. Potentiodynamic experiments revealed that TiAl, TiAl+TiB2 and TiAl+Ti5Si3 composites display active-passive corrosion behavior in both acidic and alkaline solutions.

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