Determination of HgCdTe Elasto-Plastic Properties using Nanoindentation

Mariusz Martyniuk, Richard Sewell, Charles Musca, John Dell, Lorenzo Faraone

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Depth sensing indentation has been used to investigate the elasto-plastic behavior of Hg0.7Cd0.3Te prepared by molecular beam epitaxy, liquid phase epitaxy, as well as of bulk Hg0.7Cd0.3Te prepared by the modified Bridgman method. It was found that Hg0.7Cd0.3Te was characterized by a modulus of elasticity of E-avg similar to 50 GPa and hardness of H-avg similar to 0.66 GPa, independent of growth technology. The measured hardness was observed to increase with decreasing size of indentation owing to the nucleation of dislocations within the plastic zone. The elasto-plastic response of the samples to nanoindentation was observed to be purely elastic at low indentation depths and developed into similar to 10% elastic and similar to 90% plastic response, with an increase in penetration contact depth to above 100 nm exhibiting significant amounts of creep. The transition from purely elastic to elasto-plastic behavior has been observed to be marked by discontinuities, or "pop-in" events in the indenter load-penetration curves, with the indentation zone maximum sheer stress varying with HgCdTe growth method in the range 1.1-1.8 GPa. This onset and subsequent flow of plasticity is postulated to be associated with the spontaneous nucleation and propagation of dislocations.
Original languageEnglish
Pages (from-to)1197-1205
JournalJournal of Electronic Materials
Volume35
Issue number6
DOIs
Publication statusPublished - 2006

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Nanoindentation
nanoindentation
plastic properties
indentation
plastics
Indentation
Plastics
Nucleation
hardness
penetration
Hardness
nucleation
Liquid phase epitaxy
Crystal growth from melt
Bridgman method
liquid phase epitaxy
Molecular beam epitaxy
Plasticity
modulus of elasticity
discontinuity

Cite this

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title = "Determination of HgCdTe Elasto-Plastic Properties using Nanoindentation",
abstract = "Depth sensing indentation has been used to investigate the elasto-plastic behavior of Hg0.7Cd0.3Te prepared by molecular beam epitaxy, liquid phase epitaxy, as well as of bulk Hg0.7Cd0.3Te prepared by the modified Bridgman method. It was found that Hg0.7Cd0.3Te was characterized by a modulus of elasticity of E-avg similar to 50 GPa and hardness of H-avg similar to 0.66 GPa, independent of growth technology. The measured hardness was observed to increase with decreasing size of indentation owing to the nucleation of dislocations within the plastic zone. The elasto-plastic response of the samples to nanoindentation was observed to be purely elastic at low indentation depths and developed into similar to 10{\%} elastic and similar to 90{\%} plastic response, with an increase in penetration contact depth to above 100 nm exhibiting significant amounts of creep. The transition from purely elastic to elasto-plastic behavior has been observed to be marked by discontinuities, or {"}pop-in{"} events in the indenter load-penetration curves, with the indentation zone maximum sheer stress varying with HgCdTe growth method in the range 1.1-1.8 GPa. This onset and subsequent flow of plasticity is postulated to be associated with the spontaneous nucleation and propagation of dislocations.",
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Determination of HgCdTe Elasto-Plastic Properties using Nanoindentation. / Martyniuk, Mariusz; Sewell, Richard; Musca, Charles; Dell, John; Faraone, Lorenzo.

In: Journal of Electronic Materials, Vol. 35, No. 6, 2006, p. 1197-1205.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Determination of HgCdTe Elasto-Plastic Properties using Nanoindentation

AU - Martyniuk, Mariusz

AU - Sewell, Richard

AU - Musca, Charles

AU - Dell, John

AU - Faraone, Lorenzo

PY - 2006

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AB - Depth sensing indentation has been used to investigate the elasto-plastic behavior of Hg0.7Cd0.3Te prepared by molecular beam epitaxy, liquid phase epitaxy, as well as of bulk Hg0.7Cd0.3Te prepared by the modified Bridgman method. It was found that Hg0.7Cd0.3Te was characterized by a modulus of elasticity of E-avg similar to 50 GPa and hardness of H-avg similar to 0.66 GPa, independent of growth technology. The measured hardness was observed to increase with decreasing size of indentation owing to the nucleation of dislocations within the plastic zone. The elasto-plastic response of the samples to nanoindentation was observed to be purely elastic at low indentation depths and developed into similar to 10% elastic and similar to 90% plastic response, with an increase in penetration contact depth to above 100 nm exhibiting significant amounts of creep. The transition from purely elastic to elasto-plastic behavior has been observed to be marked by discontinuities, or "pop-in" events in the indenter load-penetration curves, with the indentation zone maximum sheer stress varying with HgCdTe growth method in the range 1.1-1.8 GPa. This onset and subsequent flow of plasticity is postulated to be associated with the spontaneous nucleation and propagation of dislocations.

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