Effect of directionally solidified microstructures on the room-temperature fracture-toughness properties of Ni-33(at. pct)Al-33Cr-1Mo and Ni-33(at. pct)Al-31Cr-3Mo eutectic alloys grown at different solidification rates

2002 ◽  
Vol 33 (3) ◽  
pp. 597-612 ◽  
Author(s):  
S. V. Raj ◽  
J. A. Salem ◽  
I. E. Locci ◽  
R. J. Pawlik
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Eutectic Alloys ◽  
Directionally Solidified ◽  
Temperature Fracture

Processing and Mechanical Properties of RuAl-Based Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 1469-1474 ◽  
Author(s):  
T.D. Reynolds ◽  
M. Acosta ◽  
David R. Johnson
Keyword(s):  
Fracture Toughness ◽  
Cyclic Oxidation ◽  
Room Temperature ◽  
Single Phase ◽  
Tensile Ductility ◽  
Tensile Behavior ◽  
Directionally Solidified ◽  
Two Phase ◽  
Heat Treated ◽  
Temperature Fracture

Alloys of Ru-Al-Cr with compositions between Ru-10Al-35Cr and Ru-3Al-39Cr (at.%) were directionally solidified and heat treated to produce single phase hcp-Ru(Cr,Al) and two phase B2-hcp microstructures. The room temperature fracture toughness, tensile behavior, and cyclic oxidation behavior at 1100°C were investigated and compared to previous results measured from RuAl and Ru-Al-Mo alloys. For microstructures consisting of a Ru(Cr,Al) matrix with fine RuAl precipitate, a good room temperature fracture toughness, tensile ductility, and oxidation resistance at 1100°C were measured.

EFFECT OF Si ON MICROSTRUCTURE AND FRACTURE TOUGHNESS OF DIRECTIONALLY SOLIDIFIED Nb SILICIDE ALLOYS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2964-2969 ◽  
Author(s):  
MEILING WU ◽  
YUYE WANG ◽  
SHUSUO LI ◽  
LIWU JIANG ◽  
YAFANG HAN
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Directionally Solidified ◽  
X Ray Diffraction ◽  
X Ray ◽  
Three Point Bending ◽  
Micro Cracks ◽  
Temperature Fracture ◽  
Si Content ◽  
Energy Disperse Spectroscopy

Nb - xSi ( x =3,9,16)-22 Ti -3 Cr -3 Al -2 Hf (at.%) have been successfully prepared by directional solidification in an optical floating zone furnace. Microstructure analysis and phases identification of the alloys were examined by X-ray diffraction (XRD), Electro Probe Micro Analyzer (EPMA) and Energy Disperse Spectroscopy (EDS). Fracture toughness specimens without pre-crack were prepared, room temperature fracture toughness of alloys was tested by three-point bending method, and fracture mechanism was studied. The results showed that with increasing Si content, Nb 5 Si 3 phase gradually increased and the phase transformed from γ- Nb 5 Si 3 to the stable α- Nb 5 Si 3 phase and β- Nb 5 Si 3 phase. There appeared the Ti -rich Nb 5 Si 3 phase when the Si content is 16 at%. In addition, more micro-cracks generated in the Ti -rich Nb 5 Si 3 phase, which seriously affected room temperature fracture toughness of the alloys.

Microstructure and room temperature fracture toughness of directionally solidified NiAl–Mo eutectic in situ composites

2012 ◽  
Vol 21 (1) ◽  
pp. 18-25 ◽  
Author(s):  
Jian-Fei Zhang ◽  
Jun Shen ◽  
Zhao Shang ◽  
Zhou-Rong Feng ◽  
Ling-Shui Wang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Directionally Solidified ◽  
In Situ Composites ◽  
Temperature Fracture
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