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Title: Evaluation of strain caused by coherent precipitates in an Al alloy using TEM techniques

Abstract

Elastic strains, caused by GP zones in an aged Al alloy, were determined quantitatively using two techniques: Dark Field In-line Holography (DFH) and High Resolution Transmission Electron Microscopy-Geometric Phase Analysis (HRTEM-GPA). The results obtained by both techniques showed that the elastic strain was not uniform along the precipitate-matrix interface. In some areas, it was found that strain had negligible value and this was attributed to the loss of coherence between the lattices. It is suggested that a possible explanation for this fact could be a variation in the 'vacancies pump mechanism' kinetics. To obtain a better interpretation of the experimental deformation maps, a reference GP precipitate-matrix structure was built using QSTEM software. The main advantages of DFH over HRTEM-GPA were a bigger field of view and low electron dose requirements without spatial resolution loss. Another difference found was that crystalline defects such as dislocations were evidenced by HRTEM-GPA in contrast to the result obtained by DFH. However, strain measurements were affected by mask size effect in the former. - Highlights: Black-Right-Pointing-Pointer Strain around GP precipitates was not uniform and was in a more relaxed state. Black-Right-Pointing-Pointer Strain values determined by HRTEM had more artifacts compared with holography ones. Black-Right-Pointing-Pointer Strainmore » distribution was attributed to differences in the release of vacancies. Black-Right-Pointing-Pointer Holography showed important advantages over HRTEM regarding field of view mainly.« less

Authors:
 [1];  [2]; ; ; ;  [3];  [1]
  1. Centro de Investigacion en Materiales Avanzados (CIMAV), Laboratorio Nacional de Nanotecnologia, Miguel de Cervantes 120, Z.C. 31109, Chihuahua (Mexico)
  2. (Mexico)
  3. Facultad de Ingenieria-Instituto de Metalurgia, Universidad Autonoma de San Luis Potosi, Sierra Leona 550, Lomas 2a seccion, Z.C. 78210, San Luis Potosi (Mexico)
Publication Date:
OSTI Identifier:
22163143
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 73; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; DEFORMATION; DISLOCATIONS; HOLOGRAPHY; KINETICS; PRECIPITATION; SPATIAL RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Hernandez-Rivera, J.L., E-mail: jose.hernandez@cimav.edu.mx, Universidad del Valle de Mexico, Robles 600, Fraccionamiento Jacarandas, Z. C. 78220, San Luis Potosi, Rivera, J.J. Cruz, Garay-Reyes, C.G., Azpeitia, M. Ramos, Zuniga-Alonso, I., and Martinez-Sanchez, R. Evaluation of strain caused by coherent precipitates in an Al alloy using TEM techniques. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.07.017.
Hernandez-Rivera, J.L., E-mail: jose.hernandez@cimav.edu.mx, Universidad del Valle de Mexico, Robles 600, Fraccionamiento Jacarandas, Z. C. 78220, San Luis Potosi, Rivera, J.J. Cruz, Garay-Reyes, C.G., Azpeitia, M. Ramos, Zuniga-Alonso, I., & Martinez-Sanchez, R. Evaluation of strain caused by coherent precipitates in an Al alloy using TEM techniques. United States. doi:10.1016/J.MATCHAR.2012.07.017.
Hernandez-Rivera, J.L., E-mail: jose.hernandez@cimav.edu.mx, Universidad del Valle de Mexico, Robles 600, Fraccionamiento Jacarandas, Z. C. 78220, San Luis Potosi, Rivera, J.J. Cruz, Garay-Reyes, C.G., Azpeitia, M. Ramos, Zuniga-Alonso, I., and Martinez-Sanchez, R. Thu . "Evaluation of strain caused by coherent precipitates in an Al alloy using TEM techniques". United States. doi:10.1016/J.MATCHAR.2012.07.017.
@article{osti_22163143,
title = {Evaluation of strain caused by coherent precipitates in an Al alloy using TEM techniques},
author = {Hernandez-Rivera, J.L., E-mail: jose.hernandez@cimav.edu.mx and Universidad del Valle de Mexico, Robles 600, Fraccionamiento Jacarandas, Z. C. 78220, San Luis Potosi and Rivera, J.J. Cruz and Garay-Reyes, C.G. and Azpeitia, M. Ramos and Zuniga-Alonso, I. and Martinez-Sanchez, R.},
abstractNote = {Elastic strains, caused by GP zones in an aged Al alloy, were determined quantitatively using two techniques: Dark Field In-line Holography (DFH) and High Resolution Transmission Electron Microscopy-Geometric Phase Analysis (HRTEM-GPA). The results obtained by both techniques showed that the elastic strain was not uniform along the precipitate-matrix interface. In some areas, it was found that strain had negligible value and this was attributed to the loss of coherence between the lattices. It is suggested that a possible explanation for this fact could be a variation in the 'vacancies pump mechanism' kinetics. To obtain a better interpretation of the experimental deformation maps, a reference GP precipitate-matrix structure was built using QSTEM software. The main advantages of DFH over HRTEM-GPA were a bigger field of view and low electron dose requirements without spatial resolution loss. Another difference found was that crystalline defects such as dislocations were evidenced by HRTEM-GPA in contrast to the result obtained by DFH. However, strain measurements were affected by mask size effect in the former. - Highlights: Black-Right-Pointing-Pointer Strain around GP precipitates was not uniform and was in a more relaxed state. Black-Right-Pointing-Pointer Strain values determined by HRTEM had more artifacts compared with holography ones. Black-Right-Pointing-Pointer Strain distribution was attributed to differences in the release of vacancies. Black-Right-Pointing-Pointer Holography showed important advantages over HRTEM regarding field of view mainly.},
doi = {10.1016/J.MATCHAR.2012.07.017},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 73,
place = {United States},
year = {2012},
month = {11}
}