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Chinese Journal of Materials Research  2012, Vol. 26 Issue (6): 597-604    DOI:
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Effects of Trace Sc on the Evolution of Microstructure and Texture of Al–Zn–Mg–Cu Alloys
ZHANG Yunya, DENG Yunlai, QI Xiaohong, SONG Manxin, ZHANG Xinming
1.School of Materials Science and Engineering, Central South University, Changsha 410083
2.Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Changsha 410083
Cite this article: 

ZHANG Yunya DENG Yunlai QI Xiaohong SONG Manxin ZHANG Xinming. Effects of Trace Sc on the Evolution of Microstructure and Texture of Al–Zn–Mg–Cu Alloys. Chinese Journal of Materials Research, 2012, 26(6): 597-604.

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Abstract  

Two alloys with the different components of trace elements were prepared, and the effects of Sc on the microstructure and texture of Al–Zn–Mg–Cu alloys during hot deformation and solution treatment were investigated. Comparing with the alloy containing only trace Zr, alloy containing trace Sc and trace Zr exhibited following characteristics: after hot deformation, there are smaller sub–grains in the alloy; after solution treatment, the alloy has lower recrystalization fraction, and the density of
{011}<211> (B–) orientation is stronger, while the density of {112}<111> (C–) orientation is weaker. For this reason above all–Al3(Sc, Zr) particles formed during homogenization distribute uniformly in both inner grain areas and grain boundary areas, which severely prohibited the migration of dislocations and grain boundaries during hot deformation and solution treatment. Because of interfacial energy offered from sub–grain boundaries, the precipitation behavior of MgZn2 was promoted. The promotion and strengthen of sub–microstructural result in increase of the final hardness of alloys with the different components of trace elements by 11.3%.

Key words:  metallic materials      Al–Zn–Mg–Cu alloy      microstructure      texture      Sc element      EBSD     
Received:  15 May 2012     
ZTFLH:  TG146  
Fund: 

Supported by National Basic Research Program of China No.2012CB619500.

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2012/V26/I6/597

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