Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys

L. Balogh, T. Ungár, Yonghao Zhao, Y. T. Zhu, Zenji Horita, Cheng Xu, Terence G. Langdon

Research output: Contribution to journalArticle

190 Citations (Scopus)

Abstract

Experiments were conducted on samples of pure Cu and two Cu-Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu-Zn alloy and this is consistent with the low SFE and slow rates of recovery.

Original languageEnglish
Pages (from-to)809-820
Number of pages12
JournalActa Materialia
Volume56
Issue number4
DOIs
Publication statusPublished - Feb 2008

Fingerprint

Zinc alloys
Copper alloys
Stacking faults
Copper
Torsional stress
Twinning
Dislocations (crystals)
Microhardness
Hardness
Transmission electron microscopy
Recovery
X ray diffraction
Ultrafine
Processing
Experiments

Keywords

  • Copper alloys
  • High-pressure torsion
  • Severe plastic deformation
  • Stacking-fault energy
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

Cite this

Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys. / Balogh, L.; Ungár, T.; Zhao, Yonghao; Zhu, Y. T.; Horita, Zenji; Xu, Cheng; Langdon, Terence G.

In: Acta Materialia, Vol. 56, No. 4, 02.2008, p. 809-820.

Research output: Contribution to journalArticle

Balogh, L. ; Ungár, T. ; Zhao, Yonghao ; Zhu, Y. T. ; Horita, Zenji ; Xu, Cheng ; Langdon, Terence G. / Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys. In: Acta Materialia. 2008 ; Vol. 56, No. 4. pp. 809-820.
@article{7860aa5bea1148c1b84d18357358be82,
title = "Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys",
abstract = "Experiments were conducted on samples of pure Cu and two Cu-Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu-Zn alloy and this is consistent with the low SFE and slow rates of recovery.",
keywords = "Copper alloys, High-pressure torsion, Severe plastic deformation, Stacking-fault energy, X-ray diffraction",
author = "L. Balogh and T. Ung{\'a}r and Yonghao Zhao and Zhu, {Y. T.} and Zenji Horita and Cheng Xu and Langdon, {Terence G.}",
year = "2008",
month = "2",
doi = "10.1016/j.actamat.2007.10.053",
language = "English",
volume = "56",
pages = "809--820",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys

AU - Balogh, L.

AU - Ungár, T.

AU - Zhao, Yonghao

AU - Zhu, Y. T.

AU - Horita, Zenji

AU - Xu, Cheng

AU - Langdon, Terence G.

PY - 2008/2

Y1 - 2008/2

N2 - Experiments were conducted on samples of pure Cu and two Cu-Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu-Zn alloy and this is consistent with the low SFE and slow rates of recovery.

AB - Experiments were conducted on samples of pure Cu and two Cu-Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu-Zn alloy and this is consistent with the low SFE and slow rates of recovery.

KW - Copper alloys

KW - High-pressure torsion

KW - Severe plastic deformation

KW - Stacking-fault energy

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=38749154681&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38749154681&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2007.10.053

DO - 10.1016/j.actamat.2007.10.053

M3 - Article

VL - 56

SP - 809

EP - 820

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 4

ER -