Cargando…

3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields

In order to study the influence on the mechanical properties caused by microstructure evolution of metal powder in extreme environment, 3D real-time observation of the microstructure evolution of Al-Ti mixed powder in high temperature and microwave compound fields was realized by using synchrotron r...

Descripción completa

Detalles Bibliográficos
Autores principales: Kang, Dan, Xu, Feng, Hu, Xiao-fang, Dong, Bo, Xiao, Yu, Xiao, Ti-qiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3967726/
https://www.ncbi.nlm.nih.gov/pubmed/24737986
http://dx.doi.org/10.1155/2014/684081
_version_ 1782309055738413056
author Kang, Dan
Xu, Feng
Hu, Xiao-fang
Dong, Bo
Xiao, Yu
Xiao, Ti-qiao
author_facet Kang, Dan
Xu, Feng
Hu, Xiao-fang
Dong, Bo
Xiao, Yu
Xiao, Ti-qiao
author_sort Kang, Dan
collection PubMed
description In order to study the influence on the mechanical properties caused by microstructure evolution of metal powder in extreme environment, 3D real-time observation of the microstructure evolution of Al-Ti mixed powder in high temperature and microwave compound fields was realized by using synchrotron radiation computerized topography (SR-CT) technique; the spatial resolution was enhanced to 0.37 μm/pixel through the designed equipment and the introduction of excellent reconstruction method for the first time. The process of microstructure evolution during sintering was clearly distinguished from 2D and 3D reconstructed images. Typical sintering parameters such as sintering neck size, porosity, and particle size of the sample were presented for quantitative analysis of the influence on the mechanical properties and the sintering kinetics during microwave sintering. The neck size-time curve was obtained and the neck growth exponent was 7.3, which indicated that surface diffusion was the main diffusion mechanism; the reason was the eddy current loss induced by the external microwave fields providing an additional driving force for mass diffusion on the particle surface. From the reconstructed images and the curve of porosity and average particle size versus temperature, it was believed that the presence of liquid phase aluminum accelerated the densification and particle growth.
format Online
Article
Text
id pubmed-3967726
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher Hindawi Publishing Corporation
record_format MEDLINE/PubMed
spelling pubmed-39677262014-04-15 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields Kang, Dan Xu, Feng Hu, Xiao-fang Dong, Bo Xiao, Yu Xiao, Ti-qiao ScientificWorldJournal Research Article In order to study the influence on the mechanical properties caused by microstructure evolution of metal powder in extreme environment, 3D real-time observation of the microstructure evolution of Al-Ti mixed powder in high temperature and microwave compound fields was realized by using synchrotron radiation computerized topography (SR-CT) technique; the spatial resolution was enhanced to 0.37 μm/pixel through the designed equipment and the introduction of excellent reconstruction method for the first time. The process of microstructure evolution during sintering was clearly distinguished from 2D and 3D reconstructed images. Typical sintering parameters such as sintering neck size, porosity, and particle size of the sample were presented for quantitative analysis of the influence on the mechanical properties and the sintering kinetics during microwave sintering. The neck size-time curve was obtained and the neck growth exponent was 7.3, which indicated that surface diffusion was the main diffusion mechanism; the reason was the eddy current loss induced by the external microwave fields providing an additional driving force for mass diffusion on the particle surface. From the reconstructed images and the curve of porosity and average particle size versus temperature, it was believed that the presence of liquid phase aluminum accelerated the densification and particle growth. Hindawi Publishing Corporation 2014-03-11 /pmc/articles/PMC3967726/ /pubmed/24737986 http://dx.doi.org/10.1155/2014/684081 Text en Copyright © 2014 Dan Kang et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Kang, Dan
Xu, Feng
Hu, Xiao-fang
Dong, Bo
Xiao, Yu
Xiao, Ti-qiao
3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title_full 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title_fullStr 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title_full_unstemmed 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title_short 3D Online Submicron Scale Observation of Mixed Metal Powder's Microstructure Evolution in High Temperature and Microwave Compound Fields
title_sort 3d online submicron scale observation of mixed metal powder's microstructure evolution in high temperature and microwave compound fields
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3967726/
https://www.ncbi.nlm.nih.gov/pubmed/24737986
http://dx.doi.org/10.1155/2014/684081
work_keys_str_mv AT kangdan 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields
AT xufeng 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields
AT huxiaofang 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields
AT dongbo 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields
AT xiaoyu 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields
AT xiaotiqiao 3donlinesubmicronscaleobservationofmixedmetalpowdersmicrostructureevolutioninhightemperatureandmicrowavecompoundfields