Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Microstructures and Mechanical Behavior of 2024 Al Alloys Deformed by Equal Channel Angular Pressing

2024 Al 합금의 ECAP 공정에 따른 미세조직 변화와 강도특성

  • Kim, Seon-Hwa (Department of Materials Engineering, Soonchunhyang University) ;
  • Choi, Yong-Lak (Department of Materials Engineering, Soonchunhyang University)
  • 김선화 (순천향대학교 신소재공학과) ;
  • 최용락 (순천향대학교 신소재공학과)
  • Published : 2006.01.27
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Abstract

2024 Al alloys were severely deformed by equal channel angular pressing(ECAP) to obtain an ultrafine grain structure. The more deformation amount increased, the more grain size decreased. Most of the grain structure were changed from elongated to equiaxed shape with increasing pass number. The morphology of S' phases was also changed from rod-type to spherical type. The grain size of 6 passed specimen was 100 to 200 nm, and the size of S' phases was about 10 nm in the microstructure. XRD measurements have revealed that the texture formed by plastic deformation disappeared in the 6 passed specimen. SP test results described that the start of crack propagation occurred at the transition zone between plastic bending and membrane stretching because of small elongation. The maximum strength of ECA pressed specimen increased 1.9 GPa to 2.9 GPa with increasing pass number.

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