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Title: Role of interfaces i nthe design of ultra-high strength, radiation damage tolerant nanocomposites

Abstract

The combination of high strength and high radiation damage tolerance in nanolaminate composites can be achieved when the individual layers in these composites are only a few nanometers thick and contain special interfaces that act both as obstacles to slip, as well as sinks for radiation-induced defects. The morphological and phase stabilities and strength and ductility of these nano-composites under ion irradiation are explored as a function of layer thickness, temperature and interface structure. Magnetron sputtered metallic multilayers such as Cu-Nb and V-Ag with a range of individual layer thickness from approximately 2 nm to 50 nm and the corresponding 1000 nm thick single layer films were implanted with helium ions at room temperature. Cross-sectional Transmission Electron Microscopy (TEM) was used to measure the distribution of helium bubbles and correlated with the helium concentration profile measured vis ion beam analysis techniques to obtain the helium concentration at which bubbles are detected in TEM. It was found that in multilayers the minimum helium concentration to form bubbles (approximately I nm in size) that are easily resolved in through-focus TEM imaging was several atomic %, orders of magnitude higher than that in single layer metal films. This observation is consistent with anmore » increased solubility of helium at interfaces that is predicted by atomistic modeling of the atomic structures of fcc-bcc interfaces. At helium concentrations as high as 7 at.%, a uniform distribution of I nm diameter bubbles results in negligible irradiation hardening and loss of deformability in multi layers with layer thicknesses of a few nanometers. The control of atomic structures of interfaces to produce high helium solubility at interfaces is crucial in the design of nano-composite materials that are radiation damage tolerant. Reduced radiation damage also leads to a reduction in the irradiation hardening, particularly at layer thickness of approximately 5 run and below. The strategies for design of radiation-tolerant structural materials based on the knowledge gained from this work will be discussed.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Los Alamos National Laboratory
  2. NON LANL
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1043478
Report Number(s):
LA-UR-10-08194; LA-UR-10-8194
TRN: US201214%%34
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: Plasticity 2011 ; January 2, 2011 ; Puerto Vallarta, Mexico
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BUBBLES; COMPOSITE MATERIALS; DAMAGE; DESIGN; FILMS; HELIUM; HELIUM IONS; INTERFACES; ION BEAMS; ION IMPLANTATION; IRRADIATION; LAYERS; PLASTICITY; RADIATION EFFECTS; RADIATION HARDENING; TEMPERATURE DEPENDENCE; THICKNESS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Misra, Amit, Wang, Yongqiang, Nastasi, Michael A, Baldwin, Jon K, Wei, Qiangmin, Li, Nan, Mara, Nathan, Zhang, Xinghang, Fu, Engang, Anderoglu, Osman, Li, Hongqi, and Bhattacharyya, Dhriti. Role of interfaces i nthe design of ultra-high strength, radiation damage tolerant nanocomposites. United States: N. p., 2010. Web.
Misra, Amit, Wang, Yongqiang, Nastasi, Michael A, Baldwin, Jon K, Wei, Qiangmin, Li, Nan, Mara, Nathan, Zhang, Xinghang, Fu, Engang, Anderoglu, Osman, Li, Hongqi, & Bhattacharyya, Dhriti. Role of interfaces i nthe design of ultra-high strength, radiation damage tolerant nanocomposites. United States.
Misra, Amit, Wang, Yongqiang, Nastasi, Michael A, Baldwin, Jon K, Wei, Qiangmin, Li, Nan, Mara, Nathan, Zhang, Xinghang, Fu, Engang, Anderoglu, Osman, Li, Hongqi, and Bhattacharyya, Dhriti. Thu . "Role of interfaces i nthe design of ultra-high strength, radiation damage tolerant nanocomposites". United States. https://www.osti.gov/servlets/purl/1043478.
@article{osti_1043478,
title = {Role of interfaces i nthe design of ultra-high strength, radiation damage tolerant nanocomposites},
author = {Misra, Amit and Wang, Yongqiang and Nastasi, Michael A and Baldwin, Jon K and Wei, Qiangmin and Li, Nan and Mara, Nathan and Zhang, Xinghang and Fu, Engang and Anderoglu, Osman and Li, Hongqi and Bhattacharyya, Dhriti},
abstractNote = {The combination of high strength and high radiation damage tolerance in nanolaminate composites can be achieved when the individual layers in these composites are only a few nanometers thick and contain special interfaces that act both as obstacles to slip, as well as sinks for radiation-induced defects. The morphological and phase stabilities and strength and ductility of these nano-composites under ion irradiation are explored as a function of layer thickness, temperature and interface structure. Magnetron sputtered metallic multilayers such as Cu-Nb and V-Ag with a range of individual layer thickness from approximately 2 nm to 50 nm and the corresponding 1000 nm thick single layer films were implanted with helium ions at room temperature. Cross-sectional Transmission Electron Microscopy (TEM) was used to measure the distribution of helium bubbles and correlated with the helium concentration profile measured vis ion beam analysis techniques to obtain the helium concentration at which bubbles are detected in TEM. It was found that in multilayers the minimum helium concentration to form bubbles (approximately I nm in size) that are easily resolved in through-focus TEM imaging was several atomic %, orders of magnitude higher than that in single layer metal films. This observation is consistent with an increased solubility of helium at interfaces that is predicted by atomistic modeling of the atomic structures of fcc-bcc interfaces. At helium concentrations as high as 7 at.%, a uniform distribution of I nm diameter bubbles results in negligible irradiation hardening and loss of deformability in multi layers with layer thicknesses of a few nanometers. The control of atomic structures of interfaces to produce high helium solubility at interfaces is crucial in the design of nano-composite materials that are radiation damage tolerant. Reduced radiation damage also leads to a reduction in the irradiation hardening, particularly at layer thickness of approximately 5 run and below. The strategies for design of radiation-tolerant structural materials based on the knowledge gained from this work will be discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {12}
}

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