The effect of friction stir processing on microstructure and tensile behavior of thixomolded AZ91 magnesium alloy

Bilal Mansoor, R. F. Decker, S. Kulkarni, S. E. LeBeau, Marwan Khraisheh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Friction Stir Processing (FSP) to partial sheet thickness can be utilized to engineer unique microstructures in metallic alloys. These composite microstructures consist of three distinct layers associated with stirred, transition and core microstructural regions. The stirred region is of particular interest where severe plastic deformation imparted by the rotating and translating FSP tool under frictional heat leads to grain refinement down to ∼ 1 μm grain size. In this work, partial depth penetration into thixomolded AZ91 Mg plate from the top and bottom surfaces by friction stir processing is explored. Furthermore, low temperature aging treatments are applied to the processed material. The present results with AZ91 Mg show that FSP processed material exhibits higher strength (> 300 MPa), and improvement in ductility (> 7% tensile elongation). It is found that in addition to Hall-Petch strengthening produced by ∼ 1 μm grain size in the stirred region, the enhanced strength levels and ductility are strongly influenced by dispersoids of the intermetallic precipitates found in this alloy.

Original languageEnglish
Title of host publicationMagnesium Technology
Pages391-396
Number of pages6
Publication statusPublished - 15 May 2012
Externally publishedYes
EventMagnesium Technology 2012 - TMS 2012 Annual Meeting and Exhibition - Orlando, FL, United States
Duration: 11 Mar 201215 Mar 2012

Other

OtherMagnesium Technology 2012 - TMS 2012 Annual Meeting and Exhibition
CountryUnited States
CityOrlando, FL
Period11/3/1215/3/12

Fingerprint

Magnesium alloys
Friction
Microstructure
Processing
Ductility
Grain refinement
Intermetallics
Precipitates
Elongation
Plastic deformation
Aging of materials
Engineers
Composite materials
Temperature

Keywords

  • Aging
  • Friction stir processing
  • Mg
  • Severe plastic deformation
  • Thixomolding
  • Ultrafine grain

ASJC Scopus subject areas

  • Engineering(all)

Cite this

The effect of friction stir processing on microstructure and tensile behavior of thixomolded AZ91 magnesium alloy. / Mansoor, Bilal; Decker, R. F.; Kulkarni, S.; LeBeau, S. E.; Khraisheh, Marwan.

Magnesium Technology. 2012. p. 391-396.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mansoor, B, Decker, RF, Kulkarni, S, LeBeau, SE & Khraisheh, M 2012, The effect of friction stir processing on microstructure and tensile behavior of thixomolded AZ91 magnesium alloy. in Magnesium Technology. pp. 391-396, Magnesium Technology 2012 - TMS 2012 Annual Meeting and Exhibition, Orlando, FL, United States, 11/3/12.
@inproceedings{f047f1454f5b4288a25ce7fa4b131763,
title = "The effect of friction stir processing on microstructure and tensile behavior of thixomolded AZ91 magnesium alloy",
abstract = "Friction Stir Processing (FSP) to partial sheet thickness can be utilized to engineer unique microstructures in metallic alloys. These composite microstructures consist of three distinct layers associated with stirred, transition and core microstructural regions. The stirred region is of particular interest where severe plastic deformation imparted by the rotating and translating FSP tool under frictional heat leads to grain refinement down to ∼ 1 μm grain size. In this work, partial depth penetration into thixomolded AZ91 Mg plate from the top and bottom surfaces by friction stir processing is explored. Furthermore, low temperature aging treatments are applied to the processed material. The present results with AZ91 Mg show that FSP processed material exhibits higher strength (> 300 MPa), and improvement in ductility (> 7{\%} tensile elongation). It is found that in addition to Hall-Petch strengthening produced by ∼ 1 μm grain size in the stirred region, the enhanced strength levels and ductility are strongly influenced by dispersoids of the intermetallic precipitates found in this alloy.",
keywords = "Aging, Friction stir processing, Mg, Severe plastic deformation, Thixomolding, Ultrafine grain",
author = "Bilal Mansoor and Decker, {R. F.} and S. Kulkarni and LeBeau, {S. E.} and Marwan Khraisheh",
year = "2012",
month = "5",
day = "15",
language = "English",
isbn = "9781118291214",
pages = "391--396",
booktitle = "Magnesium Technology",

}

TY - GEN

T1 - The effect of friction stir processing on microstructure and tensile behavior of thixomolded AZ91 magnesium alloy

AU - Mansoor, Bilal

AU - Decker, R. F.

AU - Kulkarni, S.

AU - LeBeau, S. E.

AU - Khraisheh, Marwan

PY - 2012/5/15

Y1 - 2012/5/15

N2 - Friction Stir Processing (FSP) to partial sheet thickness can be utilized to engineer unique microstructures in metallic alloys. These composite microstructures consist of three distinct layers associated with stirred, transition and core microstructural regions. The stirred region is of particular interest where severe plastic deformation imparted by the rotating and translating FSP tool under frictional heat leads to grain refinement down to ∼ 1 μm grain size. In this work, partial depth penetration into thixomolded AZ91 Mg plate from the top and bottom surfaces by friction stir processing is explored. Furthermore, low temperature aging treatments are applied to the processed material. The present results with AZ91 Mg show that FSP processed material exhibits higher strength (> 300 MPa), and improvement in ductility (> 7% tensile elongation). It is found that in addition to Hall-Petch strengthening produced by ∼ 1 μm grain size in the stirred region, the enhanced strength levels and ductility are strongly influenced by dispersoids of the intermetallic precipitates found in this alloy.

AB - Friction Stir Processing (FSP) to partial sheet thickness can be utilized to engineer unique microstructures in metallic alloys. These composite microstructures consist of three distinct layers associated with stirred, transition and core microstructural regions. The stirred region is of particular interest where severe plastic deformation imparted by the rotating and translating FSP tool under frictional heat leads to grain refinement down to ∼ 1 μm grain size. In this work, partial depth penetration into thixomolded AZ91 Mg plate from the top and bottom surfaces by friction stir processing is explored. Furthermore, low temperature aging treatments are applied to the processed material. The present results with AZ91 Mg show that FSP processed material exhibits higher strength (> 300 MPa), and improvement in ductility (> 7% tensile elongation). It is found that in addition to Hall-Petch strengthening produced by ∼ 1 μm grain size in the stirred region, the enhanced strength levels and ductility are strongly influenced by dispersoids of the intermetallic precipitates found in this alloy.

KW - Aging

KW - Friction stir processing

KW - Mg

KW - Severe plastic deformation

KW - Thixomolding

KW - Ultrafine grain

UR - http://www.scopus.com/inward/record.url?scp=84860803273&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860803273&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9781118291214

SP - 391

EP - 396

BT - Magnesium Technology

ER -