Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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The Solution Treatment on Thixo-extrudates of Semi-solid Al-Zn-Mg Alloy

Al-Zn-Mg 반용융 압출재의 용체화처리

  • Kim, Dae-Hwan (Engineering Research Institute, School of Materials Science and Engineering Gyeongsang National University) ;
  • Kim, Hee-Kyung (Dongil-Metal) ;
  • Eom, Jeong-Pil (Gyeongnam Technopark) ;
  • Lim, Su-Gun (Engineering Research Institute, School of Materials Science and Engineering Gyeongsang National University)
  • 김대환 (공학연구원, 경상대학교 나노.신소재공학부) ;
  • 김희경 (동일메탈) ;
  • 엄정필 ((재) 경남테크노파크) ;
  • 임수근 (공학연구원, 경상대학교 나노.신소재공학부)
  • Received : 2012.12.28
  • Accepted : 2013.06.03
  • Published : 2013.07.30
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Abstract

In the present study, the microstructure and solution treatment response of Al-Zn-Mg alloys bars by thixo-extrusion was investigated. The alloy bars were solution treated at 400, 430, 460 and $490^{\circ}C$ for various times. In order to examine the microstructures and phase analysis of the samples after solution treatment, it was performed by optical and scanning electron microscopy. And, Vickers hardness and electrical conductivity was measured on the solution treated samples for each condition to investigate the solution treatment response of extruded bars during solution treatment. The results show that the optimum solution heat treatment conditions of thixo-extruded Al-Zn-Mg alloy for minimization of the grain growth and degradation promotion of the second phase is a temperature of $460^{\circ}C$ and holding time of 0.5 to 2 h.

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  1. Thixo-extrusion of Semi Solid 7075 Aluminum Alloys and Mechanical Properties of The Extrudates vol.34, pp.3, 2014, https://doi.org/10.7777/jkfs.2014.34.3.087