Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals

L. Wang; H. Bei; T. L. Li; Y. F. Gao; E. P. George; T. G. Nieh

doi:10.1016/j.scriptamat.2011.03.036

Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals

L. Wang, H. Bei, T. L. Li, Y. F. Gao, E. P. George, T. G. Nieh^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

62 Citations (Scopus)

Abstract

Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was ∼1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	179-182
Journal	Scripta Materialia
Volume	65
Issue number	3
DOIs	https://doi.org/10.1016/j.scriptamat.2011.03.036
Publication status	Published - Aug 2011
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Activation energy
Crystal structure
Dislocation nucleation
Nanoindentation
Pop-in

Access Output

10.1016/j.scriptamat.2011.03.036

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{bad2b93771104739a28ace968ead9d95,

title = "Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals",

abstract = "Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was ∼1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated. {\textcopyright} 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",

keywords = "Activation energy, Crystal structure, Dislocation nucleation, Nanoindentation, Pop-in",

author = "L. Wang and H. Bei and Li, {T. L.} and Gao, {Y. F.} and George, {E. P.} and Nieh, {T. G.}",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

year = "2011",

month = aug,

doi = "10.1016/j.scriptamat.2011.03.036",

language = "English",

volume = "65",

pages = "179--182",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

number = "3",

}

TY - JOUR

T1 - Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals

AU - Wang, L.

AU - Bei, H.

AU - Li, T. L.

AU - Gao, Y. F.

AU - George, E. P.

AU - Nieh, T. G.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2011/8

Y1 - 2011/8

N2 - Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was ∼1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

AB - Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was ∼1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

KW - Activation energy

KW - Crystal structure

KW - Dislocation nucleation

KW - Nanoindentation

KW - Pop-in

UR - http://www.scopus.com/inward/record.url?scp=79957504619&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-79957504619&origin=recordpage

U2 - 10.1016/j.scriptamat.2011.03.036

DO - 10.1016/j.scriptamat.2011.03.036

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6462

VL - 65

SP - 179

EP - 182

JO - Scripta Materialia

JF - Scripta Materialia

IS - 3

ER -

Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals

Abstract

Bibliographical note

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this