The hot extrusion reaction synthesis of nickel aluminide alloys

2004 ◽  
Vol 12 (1) ◽  
pp. 75-84 ◽  
Author(s):  
E.J. Minay ◽  
H.B. McShane ◽  
R.D. Rawlings
Keyword(s):  
Nickel Aluminide ◽  
Hot Extrusion ◽  
Reaction Synthesis ◽  
Extrusion Reaction

Formation of Ni3Al and NiAl by hot extrusion reaction synthesis (HERS)

1997 ◽  
Vol 37 (11) ◽  
pp. 1839-1842 ◽  
Author(s):  
K. Morsi ◽  
H. McShane ◽  
M. McLean
Keyword(s):  
Hot Extrusion ◽  
Reaction Synthesis ◽  
Extrusion Reaction

Processing defects in hot extrusion reaction synthesis

2000 ◽  
Vol 290 (1-2) ◽  
pp. 39-45 ◽  
Author(s):  
K Morsi ◽  
H.B McShane ◽  
M McLean
Keyword(s):  
Hot Extrusion ◽  
Reaction Synthesis ◽  
Processing Defects ◽  
Extrusion Reaction

scholarly journals Analysis of Residual Phases in Nickel Aluminide Powders Produced by Reaction Synthesis

1992 ◽  
Vol 288 ◽  
Author(s):  
K. P. Mccoy ◽  
K. G. Shaw ◽  
J. A. Trogolo
Keyword(s):  
Nickel Aluminide ◽  
Reaction Synthesis

Microstructure and Mechanical Bevavior of Ni3Al-Matrix Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
P. C. Brennan ◽  
W. H. Kao ◽  
S. M. Jeng ◽  
J.-M. Yang
Keyword(s):  
Yield Strength ◽  
Nickel Aluminide ◽  
Fracture Stress ◽  
Room Temperature ◽  
Hot Extrusion ◽  
Matrix Composites ◽  
The Matrix ◽  
Bend Tests ◽  
Point Bend ◽  
Particulate Reinforced

AbstractAn aluminum oxide particulate-reinforced nickel-aluminide composite was fabricated by vacuum hot pressing and hot extrusion. Room temperature three point bend tests were conducted after 1 and 100 h at 1000 °C. The composite exhibited a decrease in yield strength from 772 to 517 MPa after 100 h while the ultimate fracture stress decreased from 1174 to 998 MPa. The strain to failure increased from 4.6% to 6.0% after the same exposure. Saphikon single crystal Al2O3 fibers were used to demonstrate the materials' compatibility. The fracture surfaces of the failed composites indicated ductile failures in the matrix and decohesion between the particles and matrix.

scholarly journals 1300 K Compressive Properties of a Reaction Milled NiAl-AlN Composite

1990 ◽  
Vol 194 ◽  
Author(s):  
J. Daniel Whittenberger ◽  
Eduard Arzt ◽  
Michael J. Luton
Keyword(s):  
Stress Exponent ◽  
Nickel Aluminide ◽  
Thermomechanical Processing ◽  
Hot Isostatic Pressing ◽  
Small Diameter ◽  
Hot Extrusion ◽  
Second Phase ◽  
Strain Rates ◽  
Reaction Milling ◽  
The Matrix

AbstractCryomilling (high intensity mechanical ball milling in a liquid nitrogen bath) of the B2 crystal structure nickel aluminide leads to a NiAl-AlN composite containing about 10 vol pct second phase which is dispersed as very small diameter (< 50 nm) AlN particles in a mantle surrounding particle-free NiAl grains. The AlN particles are the result of reaction milling, where nitrogen incorporated into the matrix during cryomilling reacts with Al during subsequent thermomechanical processing to form a composite. Compressive testing at 1300 K of such materials densified by either hot extrusion or hot isostatic pressing have indicated that strength at relatively fast strain rates (>10−7 s−1 ) is dependent on the method of consolidation; however no clear dependency on densification technique appears to exist at slower rates. In addition deformation at 1300 K occurs by two distinct mechanisms, where at high strain rates the stress exponent is greater than 13 while at slower rates (< 10−7 s−1) a much lower stress exponent (∼6) was found.

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