Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment

W. T. Sun; X. G. Qiao; M. Y. Zheng; X. J. Zhao; H. W. Chen; N. Gao; M. J. Starink

doi:10.1016/j.scriptamat.2018.06.009

Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment

W. T. Sun
, X. G. Qiao^*
, M. Y. Zheng
, X. J. Zhao
, H. W. Chen
, N. Gao
, M. J. Starink

^*Corresponding author for this work

Harbin Institute of Technology
Chongqing University
University of Southampton

Research output: Contribution to journal › Article › peer-review

87 Scopus citations

Abstract

A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.

Original language	English
Pages (from-to)	21-25
Number of pages	5
Journal	Scripta Materialia
Volume	155
DOIs	https://doi.org/10.1016/j.scriptamat.2018.06.009
State	Published - Oct 2018
Externally published	Yes

Keywords

Ageing response
High pressure torsion
Magnesium-rare earth alloy
Microstructure refinement
Solute segregation

Access to Document

10.1016/j.scriptamat.2018.06.009

Cite this

@article{89c211d28c7049cc843345879eaca771,

title = "Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment",

abstract = "A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt\%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.",

keywords = "Ageing response, High pressure torsion, Magnesium-rare earth alloy, Microstructure refinement, Solute segregation",

author = "Sun, \{W. T.\} and Qiao, \{X. G.\} and Zheng, \{M. Y.\} and Zhao, \{X. J.\} and Chen, \{H. W.\} and N. Gao and Starink, \{M. J.\}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = oct,

doi = "10.1016/j.scriptamat.2018.06.009",

language = "英语",

volume = "155",

pages = "21--25",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

}

TY - JOUR

T1 - Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment

AU - Sun, W. T.

AU - Qiao, X. G.

AU - Zheng, M. Y.

AU - Zhao, X. J.

AU - Chen, H. W.

AU - Gao, N.

AU - Starink, M. J.

PY - 2018/10

Y1 - 2018/10

N2 - A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.

AB - A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.

KW - Ageing response

KW - High pressure torsion

KW - Magnesium-rare earth alloy

KW - Microstructure refinement

KW - Solute segregation

UR - https://www.scopus.com/pages/publications/85048433276

U2 - 10.1016/j.scriptamat.2018.06.009

DO - 10.1016/j.scriptamat.2018.06.009

M3 - 文章

AN - SCOPUS:85048433276

SN - 1359-6462

VL - 155

SP - 21

EP - 25

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this