Sc을 첨가한 Al-7.7wt%Zn-2.0wt%Mg-1.9wt%Cu합금의 고온 변형거동

우기도; 유용석; 김석원; Deliang Zhang; Kee-Do Woo; Yong-Seok Ryu; Sug-Won Kim; Deliang Zhang

Korean Journal of Materials Research, Vol.13, No.12, 819-824, December, 2003

DOI10.3740/MRSK.2003.13.12.819 Export Citation

Sc을 첨가한 Al-7.7wt%Zn-2.0wt%Mg-1.9wt%Cu합금의 고온 변형거동

High Temperature Deformation Behavior of Sc Added Al-7.7wt%Zn-2.0wt%Mg-1.9wt%Cu Alloy

우기도^†, 유용석, 김석원, Deliang Zhang¹

전북대학교 신소재공학부. 공학연구원 신소재개발 연구센터
¹뉴질랜드 와이카토대학 재료.공정 공학과

Kee-Do Woo^†, Yong-Seok Ryu, Sug-Won Kim, and Deliang Zhang¹

Division of Advanced Materials Engineering, The Research Center of Advanced Materials Development, Chunbuk National University, Chongju 561-756, Korea
¹Department of Materials and Process Engineering, University of Waikato, Private Bag 3105, Hamilton, New Zealand

E-mail:

The Al-7.7Zn-2.0Mg-1.9Cu-0.1Zr-0.1Sc alloy exhibited excellent elongation by the new thermomechanical treatment (TMT) process; solution treatment and furnace cooling\longrightarrowhot and cold rolling and then annealing for short time. Tensile test at high temperature from 430 to 500 ? C has been performed with various strain rates using for the Al-7.7Zn-2.0Mg-1.9Cu-0.1Zr-0.1Sc alloy obtained by the TMT process. The elongation of the Al-7.7Zn-2.0Mg-1.9Cu-0.1Zr-0.1Sc was 550% tensile tested at 470 ? C temperature and 2.2 × 10 ?3 s ?1 strain rate. The m value of Al-7.7Zn-2.0Mg-1.9Cu-0.1Zr-0.1Sc alloy deformed 85% increased from 0.33 to 0.46 with increasing total elongation. This new TMT process was very simple and easy to make the sheets in the company.

Keywords:High temperature deformation;superplasticity;aluminum alloy;TMT

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