Effect of high-temperature vacuum treatment on the electrophysical properties of single crystals of niobium

1975 ◽  
Vol 9 (1) ◽  
pp. 91-92
Author(s):  
I. P. Kuritnyk ◽  
B. I. Stadnyk ◽  
V. I. Lakh
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
Vacuum Treatment ◽  
Electrophysical Properties

Precipitation of NiHfsi phase in NiAl single crystals containing Hf

1995 ◽  
Vol 53 ◽  
pp. 532-533
Author(s):  
A. Garg ◽  
R. D. Noebe ◽  
R. Darolia
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
High Temperature Strength ◽  
Bridgman Technique ◽  
Shell Mold ◽  
Third Phase ◽  
Unknown Phase ◽  
Transmission Electron ◽  
Two Phases ◽  
Nial Matrix

Small additions of Hf to NiAl produce a significant increase in the high-temperature strength of single crystals. Hf has a very limited solubility in NiAl and in the presence of Si, results in a high density of G-phase (Ni16Hf6Si7) cuboidal precipitates and some G-platelets in a NiAl matrix. These precipitates have a F.C.C structure and nucleate on {100}NiAl planes with almost perfect coherency and a cube-on-cube orientation-relationship (O.R.). However, G-phase is metastable and after prolonged aging at high temperature dissolves at the expense of a more stable Heusler (β'-Ni2AlHf) phase. In addition to these two phases, a third phase was shown to be present in a NiAl-0.3at. % Hf alloy, but was not previously identified (Fig. 4 of ref. 2 ). In this work, we report the morphology, crystal-structure, O.R., and stability of this unknown phase, which were determined using conventional and analytical transmission electron microscopy (TEM).Single crystals of NiAl containing 0.5at. % Hf were grown by a Bridgman technique. Chemical analysis indicated that these crystals also contained Si, which was not an intentional alloying addition but was picked up from the shell mold during directional solidification.

The effect of high-temperature and high-stress martensite aging on martensitic transformation and microstructure of Ti–51.5 at % Ni single crystals

2020 ◽  
Author(s):  
E. E. Timofeeva ◽  
E. Yu. Panchenko ◽  
A. S. Eftifeeva ◽  
E. I. Yanushonite ◽  
M. V. Zherdeva ◽  
...  
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Single Crystals ◽  
High Stress

Magnetic and superconducting properties of single crystals of Sr2HoRu1−xCuxO6 grown from high temperature solutions

2006 ◽  
Vol 89 (23) ◽  
pp. 232509 ◽  
Author(s):  
S. M. Rao ◽  
K. J. Wang ◽  
N. Y. Yen ◽  
Y. Y. Chen ◽  
C. B. Tsai ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
Superconducting Properties

High temperature solution growth of perovskite Pb2CoWO6 single crystals

1991 ◽  
Vol 112 (1) ◽  
pp. 71-83 ◽  
Author(s):  
B.N. Sun ◽  
R. Boutellier ◽  
Ph. Sciau ◽  
E. Burkhardt ◽  
V. Rodriguez ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
Solution Growth ◽  
High Temperature Solution ◽  
Temperature Solution

Macroscopic glass-permeated single-crystals of fresnoite

CrystEngComm ◽  
2015 ◽  
Vol 17 (27) ◽  
pp. 5019-5025 ◽  
Author(s):  
Wolfgang Wisniewski ◽  
Marcus Nagel ◽  
Christian Rüssel
Keyword(s):  
High Temperature ◽  
Single Crystals

Macroscopic single-crystals of fresnoite permeated by glass are grown by a Czochralski-like procedure for high temperature piezoelectric applications.

Compressive response of nickel-rich NiTiHf high-temperature shape memory single crystals along the [111] orientation

2011 ◽  
Vol 65 (7) ◽  
pp. 577-580 ◽  
Author(s):  
H.E. Karaca ◽  
S.M. Saghaian ◽  
B. Basaran ◽  
G.S. Bigelow ◽  
R.D. Noebe ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Single Crystals ◽  
Compressive Response

Evaluation of Multicomponent Nickel Base LI2 and Other Intermetallic Alloys as High Temperature Structural Materials

1986 ◽  
Vol 81 ◽  
Author(s):  
D. M. Shah ◽  
D. N. Duhl
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Impact Resistance ◽  
High Strength ◽  
Structural Materials ◽  
Nickel Base Superalloy ◽  
Intermetallic Alloys ◽  
Nickel Base ◽  
Base Superalloy

AbstractMulticomponent nickel base intermetallics with the L12 structure were evaluated as high temperature structural materials. The compounds were based on the γ' composition of PWA 1480, a high strength single crystal nickel base superalloy. The best balance of properties in the compound was achieved with <111> oriented single crystals but no significant advantage could be demonstrated over the precipitation hardened superalloys. Insufficient impact resistance was a major deficiency of the L12 compounds. Other nickel base intermetallics were also evaluated but showed little advantage over superalloys.

Sign in / Sign up

Export Citation Format

Share Document