Orientation dependence of creep behavior of single crystal γ′ (Ni3Al)

1983 ◽  
Vol 17 (8) ◽  
pp. 997-1002 ◽  
Author(s):  
D.M. Shah
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Orientation Dependence

Orientation Dependent Strength and Cross-Slip Structure of Ordinary Dislocations in Single Crystal γ-Ti-56A1

1998 ◽  
Vol 552 ◽  
Author(s):  
Q. Feng ◽  
S. H.
Keyword(s):  
Single Crystal ◽  
High Temperatures ◽  
Slip Plane ◽  
Forward Direction ◽  
Orientation Dependence ◽  
Cross Slip ◽  
Dislocation Loops ◽  
Single Slip ◽  
Anomalous Hardening ◽  
Double Cross

ABSTRACTThe temperature as well as orientation dependence in anomalous hardening occurs in single crystal Ti-56AI between 673K and 1073K under single slip of ordinary dislocations. The ordinary dislocations (1/2<110]) are gliding not only on (111) plane but also on (110) plane in the temperature range where the anomalous hardening occurs in single crystal Ti-56A1. The TEM study shows that the (110) cross-slip of ordinary dislocations is a double cross-slip in nature in which first, the dislocations cross-slip from the primary (111) slip plane to (110) plane followed by cross-slipping again onto another primary slip plane. This double cross-slip leaves a pair of edge segments 'superjogs' in (110) planes. It appears that these superjogs are immobile in the forward direction and act as pinning points. Furthermore, these pinning points would act as a Frank-Read source for the double cross-slipped dislocations, which generate dislocation loops as well as dislocation dipoles. The pinning structure, multiplane dislocation loops, and dipoles of double cross-slip origin all contribute to anomalous hardening at high temperatures in this material.

Indirect Coupling Constants in a Thallium Single Crystal

1974 ◽  
Vol 52 (8) ◽  
pp. 687-693
Author(s):  
J. Schratter ◽  
D. Llewelyn Williams
Keyword(s):  
Single Crystal ◽  
Angular Dependence ◽  
Line Width ◽  
Orientation Dependence ◽  
Coupling Constants ◽  
Second Moment ◽  
Indirect Coupling ◽  
First Time

We have measured the angular dependence of the line width in thallium and related it to the second moment to estimate the pseudodipolar and pseudoexchange contributions for the first two shells of neighbors. These values are very different, despite the fact that both shells have nearly the same radius, and this establishes experimentally for the first time an orientation dependence of the indirect coupling constants.

Orientation dependence of electrical properties of 0.96Na0.5Bi0.5TiO3-0.04BaTiO3 lead-free piezoelectric single crystal

2009 ◽  
Vol 95 (3) ◽  
pp. 761-767 ◽  
Author(s):  
Wenwei Ge ◽  
Hong Liu ◽  
Xiangyong Zhao ◽  
Xiaobing Li ◽  
Xiaoming Pan ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Single Crystal ◽  
Orientation Dependence ◽  
Lead Free

Temperature and Orientation Dependence of Surface Film Effects in Single Crystal Nial

1986 ◽  
Vol 81 ◽  
Author(s):  
R.D. Noebe ◽  
J.T. Kim ◽  
R. Gibala
Keyword(s):  
Single Crystal ◽  
Crystallographic Orientation ◽  
Surface Film ◽  
Orientation Dependence ◽  
Surface Films ◽  
Temperature Dependent ◽  
Paper Surface ◽  
Bcc Metals ◽  
Coated Materials ◽  
Ordered Alloys

AbstractDuring deformation of bcc metals and bcc-based ordered alloys, conditions of elastic and plastic constraint associated with the presence of thin adherent surface films can be responsible for introducing increased densities of mobile dislocations in the metal, resulting in enhanced ductility and reduced yield and flow stresses of the film-coated materials. In the present paper, surface film effects were investigated as a function of temperature and crystallographic orientation for single crystal β-NiAl. Appreciable temperature-dependent and orientation-dependent surface film effects were observed, as were significant effects of film adherence on the observation of surface film softening.

Creep Behavior of Single Crystal Superalloy DD6 at 760°C and 980°C

2007 ◽  
Vol 539-543 ◽  
pp. 3118-3123 ◽  
Author(s):  
Jia Rong Li ◽  
Kai Guo Wang ◽  
Yu Shi Luo ◽  
Shi Zhong Liu ◽  
Mei Han ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Single Crystal Superalloy
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