skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep

Abstract

The cutting of {gamma}{prime}-particles by dislocations during shear creep deformation of CMSX 6 superalloy single crystals loaded on the macroscopic crystallographic shear system {l_angle}110{r_angle}{l_brace}111{r_brace} at T = 1,025 C and {tau} = 85 MPa is analyzed using transmission electron microscopy (TEM). The formation of a {l_angle}010{r_angle}-dislocation in the {gamma}{prime}-phase was observed and investigated by means of stereo microscopy, line trace and g{center_dot}b-analysis. Two {gamma}-matrix channel dislocations with different Burgers vectors (b) of type a{sub 0}/2<110> jointly shear the {gamma}{prime}-particle where they form a superdislocation with a total Burgers vector of a{sub 0}{l_angle}010{r_angle}. The present paper provides microstructural evidence for this high temperature cutting process. The results are discussed in relation to the evolution of the dislocation structure in the {gamma}-channels during primary creep. Peach-Koehler forces were calculated to explain the formation of the {l_angle}010{r_angle}-dislocation.

Authors:
 [1];  [2]
  1. Ruhr-Univ. Bochum (Germany). Inst. fuer Werkstoffe-Werkstoffwissenschaft
  2. Academy of Sciences, Brno (Czech Republic). Inst. of Physics and Materials
Publication Date:
Sponsoring Org.:
Deutsche Forschungsgemeinschaft, Bonn (Germany); Government of the Czech Republic (Czech Republic)
OSTI Identifier:
554121
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 45; Journal Issue: 10; Other Information: PBD: Oct 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; CREEP; NICKEL BASE ALLOYS; MONOCRYSTALS; DISLOCATIONS; BURGERS VECTOR; TEMPERATURE RANGE 1000-4000 K; PARTICLES; CUTTING; SUPERDISLOCATIONS

Citation Formats

Eggeler, G, and Dlouhy, A. On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep. United States: N. p., 1997. Web. doi:10.1016/S1359-6454(97)00084-0.
Eggeler, G, & Dlouhy, A. On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep. United States. https://doi.org/10.1016/S1359-6454(97)00084-0
Eggeler, G, and Dlouhy, A. 1997. "On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep". United States. https://doi.org/10.1016/S1359-6454(97)00084-0.
@article{osti_554121,
title = {On the formation of {l_angle}010{r_angle}-dislocations in the {gamma}{prime}-phase of superalloy single crystals during high temperature low stress creep},
author = {Eggeler, G and Dlouhy, A},
abstractNote = {The cutting of {gamma}{prime}-particles by dislocations during shear creep deformation of CMSX 6 superalloy single crystals loaded on the macroscopic crystallographic shear system {l_angle}110{r_angle}{l_brace}111{r_brace} at T = 1,025 C and {tau} = 85 MPa is analyzed using transmission electron microscopy (TEM). The formation of a {l_angle}010{r_angle}-dislocation in the {gamma}{prime}-phase was observed and investigated by means of stereo microscopy, line trace and g{center_dot}b-analysis. Two {gamma}-matrix channel dislocations with different Burgers vectors (b) of type a{sub 0}/2<110> jointly shear the {gamma}{prime}-particle where they form a superdislocation with a total Burgers vector of a{sub 0}{l_angle}010{r_angle}. The present paper provides microstructural evidence for this high temperature cutting process. The results are discussed in relation to the evolution of the dislocation structure in the {gamma}-channels during primary creep. Peach-Koehler forces were calculated to explain the formation of the {l_angle}010{r_angle}-dislocation.},
doi = {10.1016/S1359-6454(97)00084-0},
url = {https://www.osti.gov/biblio/554121}, journal = {Acta Materialia},
number = 10,
volume = 45,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 1997},
month = {Wed Oct 01 00:00:00 EDT 1997}
}