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Title: Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE)

Abstract

In the present work, the microstructural evolutions and microhardness of AA1050 subjected to one, two and three passes of accumulative back extrusion (ABE) were investigated. The microstructural evolutions were characterized using transmission electron microscopy. The results revealed that applying three passes of accumulative back extrusion led to significant grain refinement. The initial grain size of 47 {mu}m was refined to the grains of 500 nm after three passes of ABE. Increasing the number of passes resulted in more decrease in grain size, better microstructure homogeneity and increase in the microhardness. The cross-section of ABEed specimen consisted of two different zones: (i) shear deformation zone, and (ii) normal deformation zone. The microhardness measurements indicated that the hardness increased from the initial value of 31 Hv to 67 Hv, verifying the significant microstructural refinement via accumulative back extrusion. - Highlights: Black-Right-Pointing-Pointer A significant grain refinement can be achieved in AA1050, Al alloy by applying ABE. Black-Right-Pointing-Pointer Microstructural homogeneity of ABEed samples increased by increasing the number of ABE cycles. Black-Right-Pointing-Pointer A substantial increase in the hardness, from 31 Hv to 67 Hv, was recorded.

Authors:
 [1];  [2]; ;  [1];  [3]
  1. Mechanical Engineering Department, University of Tehran, Tehran (Iran, Islamic Republic of)
  2. (Iran, Islamic Republic of)
  3. Materials Science and Engineering Department, Engineering School, Amirkabir University, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22066451
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 68; 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; ALUMINIUM BASE ALLOYS; DEFORMATION; EXTRUSION; GRAIN REFINEMENT; GRAIN SIZE; MICROHARDNESS; PLASTICITY; SHEAR; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Alihosseini, H., E-mail: hamid.alihossieni@gmail.com, Materials Science and Engineering Department, Engineering School, Amirkabir University, Tehran, Faraji, G., Dizaji, A.F., and Dehghani, K. Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE). United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.03.004.
Alihosseini, H., E-mail: hamid.alihossieni@gmail.com, Materials Science and Engineering Department, Engineering School, Amirkabir University, Tehran, Faraji, G., Dizaji, A.F., & Dehghani, K. Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE). United States. doi:10.1016/J.MATCHAR.2012.03.004.
Alihosseini, H., E-mail: hamid.alihossieni@gmail.com, Materials Science and Engineering Department, Engineering School, Amirkabir University, Tehran, Faraji, G., Dizaji, A.F., and Dehghani, K. Fri . "Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE)". United States. doi:10.1016/J.MATCHAR.2012.03.004.
@article{osti_22066451,
title = {Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE)},
author = {Alihosseini, H., E-mail: hamid.alihossieni@gmail.com and Materials Science and Engineering Department, Engineering School, Amirkabir University, Tehran and Faraji, G. and Dizaji, A.F. and Dehghani, K.},
abstractNote = {In the present work, the microstructural evolutions and microhardness of AA1050 subjected to one, two and three passes of accumulative back extrusion (ABE) were investigated. The microstructural evolutions were characterized using transmission electron microscopy. The results revealed that applying three passes of accumulative back extrusion led to significant grain refinement. The initial grain size of 47 {mu}m was refined to the grains of 500 nm after three passes of ABE. Increasing the number of passes resulted in more decrease in grain size, better microstructure homogeneity and increase in the microhardness. The cross-section of ABEed specimen consisted of two different zones: (i) shear deformation zone, and (ii) normal deformation zone. The microhardness measurements indicated that the hardness increased from the initial value of 31 Hv to 67 Hv, verifying the significant microstructural refinement via accumulative back extrusion. - Highlights: Black-Right-Pointing-Pointer A significant grain refinement can be achieved in AA1050, Al alloy by applying ABE. Black-Right-Pointing-Pointer Microstructural homogeneity of ABEed samples increased by increasing the number of ABE cycles. Black-Right-Pointing-Pointer A substantial increase in the hardness, from 31 Hv to 67 Hv, was recorded.},
doi = {10.1016/J.MATCHAR.2012.03.004},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 68,
place = {United States},
year = {2012},
month = {6}
}