Dislocation Structure Evolution in Thin Single Crystal Plates Under Cyclic Loading

MRS Proceedings ◽

10.1557/proc-399-397 ◽

1995 ◽

Vol 399 ◽

Author(s):

Yury. N. Stepanov ◽

Alexander M. Scorupsky

Keyword(s):

Material Processing ◽

Cyclic Loading ◽

Single Crystal ◽

Dislocation Structure ◽

Material Properties ◽

Uniaxial Loading ◽

Structure Evolution ◽

Dislocation Loops ◽

Optimum Regime

ABSTRACTThe effect of cyclic uniaxial loading applied to surfaces of thin single crystal plates on dislocation structure is analyzed analytically and numerically. This work investigates detailed changes in dislocation structure near surfaces and in size and concentration of dislocation loops inside the crystal. The results may be helpful in choosing the optimum regime for material processing and in predicting material properties.

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Microstructure and dislocation structure evolution during creep life of Ni-based single crystal superalloys

Journal of Material Science and Technology ◽

10.1016/j.jmst.2019.11.028 ◽

2020 ◽

Vol 45 ◽

pp. 207-214 ◽

Cited By ~ 4

Author(s):

Hao Yu ◽

Wei Xu ◽

Sybrand van der Zwaag

Keyword(s):

Single Crystal ◽

Dislocation Structure ◽

Structure Evolution ◽

Creep Life

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Dislocation Structure in Single Crystal L1o Type Ti-Al-V Compound

MRS Proceedings ◽

10.1557/proc-213-291 ◽

1990 ◽

Vol 213 ◽

Cited By ~ 5

Author(s):

Y.D. Hahn ◽

Z.X. Li ◽

S.H. Whang ◽

T. Kawabata

Keyword(s):

Single Crystal ◽

Single Crystals ◽

High Temperatures ◽

Dislocation Structure ◽

The Other ◽

Dislocation Loops ◽

Single Slip ◽

Pile Up ◽

Favorable Configuration ◽

Dipole Form

ABSTRACTSingle Crystals of L1o type Ti44Al54V2 alloy were deformed at high temperatures and various orientations. The dislocations thus produced by single slip were studied by TEM. 1/2<110] dislocations produced at 1073 K consist of dislocation loops and curled dislocations with spiral segments, which is in agreement with those shown in the polycrystalline Ti-Al-V, and -Nb alloys deformed under the same conditions. The normal dislocations produced at 873 K pile up in groups, each of which contains several straight dislocations with a screw character. On the other hand, the majority of superdislocations produced at 873 K were found in a dipole form, indicating that the dipole is a favorable configuration at this temperature.

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Dislocation Dynamics Simulations of Dislocation Interactions in Thin Fcc Metal Films

MRS Proceedings ◽

10.1557/proc-673-p2.2 ◽

2001 ◽

Vol 673 ◽

Cited By ~ 9

Author(s):

Prita Pant ◽

K.W. Schwarz ◽

S.P. Baker

Keyword(s):

Cyclic Loading ◽

Single Crystal ◽

Dislocation Structure ◽

Metal Films ◽

Dislocation Dynamics ◽

Threading Dislocation ◽

Dislocation Interactions ◽

Oriented Films ◽

Dynamics Simulations ◽

Fcc Metal

ABSTRACTMesoscopic simulations of dislocation interactions in thin, single crystal FCC metal films were carried out. Interactions between threading-misfit and threading-threading dislocation pairs were studied and the strength of the interactions determined. Threading-threading interactions were found to be significantly stronger than threading-misfit interactions. Dislocations with different possible combinations of Burgers vectors were studied under cyclic loading. Only annihilation of dislocations was seen to result in residual dislocation structure after complete unloading. No differences were observed in the nature of threading-misfit interactions in 111 and 001 oriented films.

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INFLUENCE OF INITIAL DISLOCATION STRUCTURE ON POINT AND MICROSCOPIC DEFECTS KINETIC UNDER IRRADIATION

Vestnik of Samara University Natural Science Series ◽

10.18287/2541-7525-2016-22-1-2-69-84 ◽

2017 ◽

Vol 22 (1-2) ◽

pp. 69-84

Author(s):

D. A. Kornilov ◽

V. M. Kosenkov ◽

P. P. Silantev

Keyword(s):

Neutron Irradiation ◽

Dislocation Structure ◽

Edge Dislocation ◽

Material Properties ◽

Radiation Defect ◽

Defect Concentration ◽

Dislocation Loops ◽

Quantitative Effect ◽

Radiation Swelling ◽

Edge Dislocations

This work is aimed for justification of quantitative effect of radiation defect concentration decreasing in materials depending on density of edge dislocation which are their outlet. The results of defect kinetics modeling with taking into account their recombination on dislocation loops, edge dislocations and pores are given. The summery of this work is useful in the frame of solving problem of decreasing radiation swelling and material properties degradation during neutron irradiation.

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Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010009292x ◽

1976 ◽

Vol 34 ◽

pp. 592-593

Author(s):

Ernest L. Hall ◽

J. B. Vander Sande

Keyword(s):

Mechanical Properties ◽

Single Crystal ◽

Dislocation Structure ◽

Room Temperature ◽

Elevated Temperatures ◽

Strain Curve ◽

Optical Devices ◽

Semiconductor Compound ◽

Wide Range ◽

Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

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