Fracture Toughness and the Effects of Stress State on Fracture of Nickel Aluminides

1990 ◽  
Vol 186 ◽  
Author(s):  
John J. Lewandowski ◽  
Gary M. Michal ◽  
Ivan Locci ◽  
Joseph D. Rigney
Keyword(s):  
Stress State ◽  
Hydrostatic Pressure ◽  
Tensile Testing ◽  
Fracture Behavior ◽  
Room Temperature ◽  
In Situ Monitoring ◽  
High Toughness ◽  
Tension Tests ◽  
Effects Of Stress

AbstractThe effects of stress state on the fracture behavior of Ni3Al, Ni3Al + B, and NiAl were determined using either notched, or fatigue-precracked bend bars tested to failure at room temperature, in addition to testing specimens in tension under superposed hydrostatic pressure. Although Ni3AI is observed to fail in a macroscopically brittle intergranular manner in tension tests conducted at room temperature, the fracture toughnesses (i.e. K IC presently obtained on Ni3Al exceeded 20 MPa1m and R-curve behavior was exhibited. In-situ monitoring of the fracture experiments was utilized to aid in interpreting the source(s) of the high toughness in Ni3Al, while SEM fractography was utilized to determine the operative fracture modes. The superposition of hydrostatic pressure during tensile testing of NiAl specimens was observed to produce increased ductility without changing the fracture mode.

Effects of stress state, strain rate, and temperature on fracture behavior of in situ TiB2/2024 Al composite

2020 ◽  
Vol 151 ◽  
pp. 103641
Author(s):  
Ruifeng Wang ◽  
Weiguo Guo ◽  
Jianjun Wang ◽  
Kangbo Yuan ◽  
Lanting Liu ◽  
...  
Keyword(s):  
Stress State ◽  
Strain Rate ◽  
Fracture Behavior ◽  
Al Composite ◽  
Effects Of Stress

Nanoindentation and Bending Fracture Behavior of Flexible Sulfide Thin Films Grown at Near Room Temperature With in Situ Tensile/Compressive Stress

2019 ◽  
Vol 21 (7) ◽  
pp. 1801329 ◽  
Author(s):  
Da Bin Kim ◽  
Seung Min Lee ◽  
Jin Woo Jang ◽  
Bhaskar Chandra Mohanty ◽  
Yong Soo Cho
Keyword(s):  
Thin Films ◽  
Compressive Stress ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Bending Fracture

Size-dependent fracture behavior of GaN pillars under room temperature compression

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23241-23247
Author(s):  
Sufeng Fan ◽  
Xiaocui Li ◽  
Rong Fan ◽  
Yang Lu
Keyword(s):  
Fracture Behavior ◽  
Room Temperature ◽  
Power Device ◽  
Compression Tests ◽  
Single Crystalline ◽  
Size Dependent ◽  
Electron Microscopes

Single crystalline GaN pillars are characterized by in situ compression tests inside electron microscopes, showing distinct size-dependent fracture behavior at room temperature for potential microelectronics, power device and MEMS applications.

Tensile and Fracture Behavior of NbSS/Nb5Si3 In Situ Composites Prepared by Arc Melting

2005 ◽  
Vol 297-300 ◽  
pp. 507-514
Author(s):  
Jin Hak Kim ◽  
Tatsuo Tabaru ◽  
Michiru Sakamoto ◽  
Shuji Hanada
Keyword(s):  
Base Composition ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Secondary Phase ◽  
Secondary Phases ◽  
In Situ Composites ◽  
Arc Melting ◽  
Negative Effect ◽  
Base Composite

Nb-base in-situ composites, which have the base composition of Nb-18Si-5Mo-5Hf, have been investigated in microstructure, hardness (Hv*), Young’s modulus (E), tensile properties and fracture behavior. The microstructures of all composites examined consist of NbSS matrix and Nb5Si3 secondary phases. No secondary phase such as Nb2C appeared. The crystal structure of Nb5Si3 is Mn5Si3-type when C replaces 2mol%-Nb, though typical structures of a (Cr5B3-type) and b (W5Si3-type) as in the base composition when W replaces. W addition is effective in increasing Hv* and E of both phases as expected. However, C alloying is somewhat beneficial only in Nb5Si3 with a noticeable negative effect in NbSS. Furthermore, the composite exhibits the highest strength at 1473 K, while the base composite exhibits the highest at room temperature. The fracture behavior is independent of the compositions and it is controlled by cleavage fractures of Nb5Si3, decohesion of NbSS/Nb5Si3 interface and ductile rupture of NbSS depending on the testing temperatures.

Hydrostatic Compression of Graphite Oxide to 49 GPa: A Raman Spectroscopic Study

2015 ◽  
Vol 1727 ◽  
Author(s):  
Varghese Swamy ◽  
Jong Boon Ooi ◽  
Alexander Kurnosov ◽  
Leonid S. Dubrovinsky ◽  
Alexei Y. Kuznetsov ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Graphite Oxide ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Hydrostatic Compression ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
In Situ Raman ◽  
Diamond Anvil

ABSTRACTThe compression and decompression behaviors of graphite oxide have been investigated using in situ Raman measurements in a diamond-anvil cell at room temperature. The so-called G band (in-plane E2g mode ∼1600 cm-1) was followed to 49 GPa during compression and back to ambient under decompression. The Raman frequency of the G band increases sublinearly with increasing hydrostatic pressure, eventually nearly flattening out at the highest pressure measured. This trend is reversed upon decompression, fully recovering to the ambient spectrum. The increased broadening suggests a reversible disordering of the structure without significant sp2-sp3 rehybridization under pressure.

Real‐Time, In Situ Monitoring of Room‐Temperature Silicon Surface Cleaning Using Hydrogen and Ammonia Plasmas

1993 ◽  
Vol 140 (11) ◽  
pp. 3316-3321 ◽  
Author(s):  
Zhen‐Hong Zhou ◽  
Eray S. Aydil ◽  
Richard A. Gottscho ◽  
Yves J. Chabal ◽  
Rafael Reif
Keyword(s):  
Real Time ◽  
Silicon Surface ◽  
Room Temperature ◽  
Surface Cleaning ◽  
In Situ Monitoring
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