Deformation mechanisms in free-standing nanoscale thin films: A quantitative in situ transmission electron microscope study

M. A. Haque, M. T.A. Saif

Research output: Contribution to journalArticle

Abstract

We have added force and displacement measurement capabilities in the transmission electron microscope (TEM) for in situ quantitative tensile experimentation on nanoscale specimens. Employing the technique, we measured the stress-strain response of several nanoscale free-standing aluminum and gold films subjected to several loading and unloading cycles. We observed low elastic modulus, nonlinear elasticity, lack of work hardening, and macroscopically brittle nature in these metals when their average grain size is 50 nm or less. Direct in situ TEM observation of the absence of dislocations in these films even at high stresses points to a grain-boundary-based mechanism as a dominant contributing factor in nanoscale metal deformation. When grain size is larger, the same metals regain their macroscopic behavior. Addition of quantitative capability makes the TEM a versatile tool for new fundamental investigations on materials and structures at the nanoscale.

Original languageEnglish (US)
Pages (from-to)6335-6340
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume101
Issue number17
DOIs
StatePublished - Apr 27 2004

Fingerprint

Elastic Modulus
Metals
Electrons
Aluminum
Gold
Observation

ASJC Scopus subject areas

  • General

Cite this

@article{5af55a18943945d5af4b37f47b18c9a4,
title = "Deformation mechanisms in free-standing nanoscale thin films: A quantitative in situ transmission electron microscope study",
abstract = "We have added force and displacement measurement capabilities in the transmission electron microscope (TEM) for in situ quantitative tensile experimentation on nanoscale specimens. Employing the technique, we measured the stress-strain response of several nanoscale free-standing aluminum and gold films subjected to several loading and unloading cycles. We observed low elastic modulus, nonlinear elasticity, lack of work hardening, and macroscopically brittle nature in these metals when their average grain size is 50 nm or less. Direct in situ TEM observation of the absence of dislocations in these films even at high stresses points to a grain-boundary-based mechanism as a dominant contributing factor in nanoscale metal deformation. When grain size is larger, the same metals regain their macroscopic behavior. Addition of quantitative capability makes the TEM a versatile tool for new fundamental investigations on materials and structures at the nanoscale.",
author = "Haque, {M. A.} and Saif, {M. T.A.}",
year = "2004",
month = "4",
day = "27",
doi = "10.1073/pnas.0400066101",
language = "English (US)",
volume = "101",
pages = "6335--6340",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
number = "17",

}

TY - JOUR

T1 - Deformation mechanisms in free-standing nanoscale thin films

T2 - A quantitative in situ transmission electron microscope study

AU - Haque, M. A.

AU - Saif, M. T.A.

PY - 2004/4/27

Y1 - 2004/4/27

N2 - We have added force and displacement measurement capabilities in the transmission electron microscope (TEM) for in situ quantitative tensile experimentation on nanoscale specimens. Employing the technique, we measured the stress-strain response of several nanoscale free-standing aluminum and gold films subjected to several loading and unloading cycles. We observed low elastic modulus, nonlinear elasticity, lack of work hardening, and macroscopically brittle nature in these metals when their average grain size is 50 nm or less. Direct in situ TEM observation of the absence of dislocations in these films even at high stresses points to a grain-boundary-based mechanism as a dominant contributing factor in nanoscale metal deformation. When grain size is larger, the same metals regain their macroscopic behavior. Addition of quantitative capability makes the TEM a versatile tool for new fundamental investigations on materials and structures at the nanoscale.

AB - We have added force and displacement measurement capabilities in the transmission electron microscope (TEM) for in situ quantitative tensile experimentation on nanoscale specimens. Employing the technique, we measured the stress-strain response of several nanoscale free-standing aluminum and gold films subjected to several loading and unloading cycles. We observed low elastic modulus, nonlinear elasticity, lack of work hardening, and macroscopically brittle nature in these metals when their average grain size is 50 nm or less. Direct in situ TEM observation of the absence of dislocations in these films even at high stresses points to a grain-boundary-based mechanism as a dominant contributing factor in nanoscale metal deformation. When grain size is larger, the same metals regain their macroscopic behavior. Addition of quantitative capability makes the TEM a versatile tool for new fundamental investigations on materials and structures at the nanoscale.

UR - http://www.scopus.com/inward/record.url?scp=2342468001&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2342468001&partnerID=8YFLogxK

U2 - 10.1073/pnas.0400066101

DO - 10.1073/pnas.0400066101

M3 - Article

C2 - 15084745

AN - SCOPUS:2342468001

VL - 101

SP - 6335

EP - 6340

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 17

ER -