Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5
Interfacial dislocations found in single crystal superalloys after long term thermal aging have an important effect on mechanical properties. Long term thermal aging tests for DD5 single crystal superalloy were carried out at 1,100 °C for 20, 100, 200, 500 and 1000 h, and then cooled by air. The eff...
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doaj-983c164cfdc3414cb6499fd6cfd4fdfc2020-11-24T21:34:57ZengFoundry Journal AgencyChina Foundry1672-64211672-64212019-01-01161142210.1007/s41230-019-8113-yEvolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5Qiang Gao0Li-rong Liu1Xiao-hua Tang2School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaInterfacial dislocations found in single crystal superalloys after long term thermal aging have an important effect on mechanical properties. Long term thermal aging tests for DD5 single crystal superalloy were carried out at 1,100 °C for 20, 100, 200, 500 and 1000 h, and then cooled by air. The effect of long term thermal aging on the dislocation networks at the γ/γ' interfaces was investigated by FE-SEM. Results showed that during the long term thermal aging at 1,100 °C, misfit dislocations formed firstly and then reorientation in the (001) interfacial planes occurred. Different types of square or rectangular dislocation network form by dislocation reaction. Square dislocation networks consisting of four groups of dislocations can transform into octagonal dislocation networks, and then form another square dislocation network by dislocation reaction. Rectangular dislocation networks can also transform into hexagonal dislocation networks. The interfacial dislocation networks promote the γ' phase rafting process. The dislocation networks spacings become smaller and smaller, leading to the effective lattice misfit increasing from -0.10% to -0.32%. http://ff.foundryworld.com/uploadfile/2019012455829917.pdfDD5 single crystal superalloyinterfacial dislocationslong term thermal agingeffective lattice misfit |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qiang Gao Li-rong Liu Xiao-hua Tang |
spellingShingle |
Qiang Gao Li-rong Liu Xiao-hua Tang Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 China Foundry DD5 single crystal superalloy interfacial dislocations long term thermal aging effective lattice misfit |
author_facet |
Qiang Gao Li-rong Liu Xiao-hua Tang |
author_sort |
Qiang Gao |
title |
Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 |
title_short |
Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 |
title_full |
Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 |
title_fullStr |
Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 |
title_full_unstemmed |
Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5 |
title_sort |
evolution of interfacial dislocation networks during long term thermal aging in ni-based single crystal superalloy dd5 |
publisher |
Foundry Journal Agency |
series |
China Foundry |
issn |
1672-6421 1672-6421 |
publishDate |
2019-01-01 |
description |
Interfacial dislocations found in single crystal superalloys after long term thermal aging have an important effect on mechanical properties. Long term thermal aging tests for DD5 single crystal superalloy were carried out at 1,100 °C for 20, 100, 200, 500 and 1000 h, and then cooled by air. The effect of long term thermal aging on the dislocation networks at the γ/γ' interfaces was investigated by FE-SEM. Results showed that during the long term thermal aging at 1,100 °C, misfit dislocations formed firstly and then reorientation in the (001) interfacial planes occurred. Different types of square or rectangular dislocation network form by dislocation reaction. Square dislocation networks consisting of four groups of dislocations can transform into octagonal dislocation networks, and then form another square dislocation network by dislocation reaction. Rectangular dislocation networks can also transform into hexagonal dislocation networks. The interfacial dislocation networks promote the γ' phase rafting process. The dislocation networks spacings become smaller and smaller, leading to the effective lattice misfit increasing from -0.10% to -0.32%.
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topic |
DD5 single crystal superalloy interfacial dislocations long term thermal aging effective lattice misfit |
url |
http://ff.foundryworld.com/uploadfile/2019012455829917.pdf |
work_keys_str_mv |
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