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AZ31B 마그네슘 합금의 기계적 특성에 미치는 열간압출의 영향

Influence of Hot-Extrusion on Mechanical Properties of AZ31B Magnesium Alloy Sheet

  • 김용길 (경남지방 중소기업청) ;
  • 최학규 (창원기능대학 금속학과) ;
  • 강민철 (한국마그네슘기술연구조합) ;
  • 정해용 (부경대학교 신소재공학부) ;
  • 배차헌 (부경대학교 신소재공학부)
  • Kim Yong-Gil (Gyeongnam Regional Office, Small and Medium Business Administration) ;
  • Choi Hak-Kyu (Dept. of materials, Changwon Polytechnic College) ;
  • Kang Min-Cheol (KMTRA(Korea Magnesium Technology Research Association)) ;
  • Jeong Hae-Yong (Dept. of materials science and engineering, Pukyong National Univ.) ;
  • Bae Cha-Hurn (Dept. of materials science and engineering, Pukyong National Univ.)
  • 발행 : 2005.01.01

초록

The microstructural changes by hot extrusion of AZ31B magnesium alloy were observed, and the relation to the tensile property was examined. The tensile properties as oriented longitudinal(L), half transverse(HT) and long transverse(LT) to the extrusion direction were investigated at $20^{\circ}C,\;100^{\circ}C,\;200^{\circ}C,\;300^{\circ}C\;and\;400^{\circ}C$, respectively. As the results, many recrystallized small grains distributed uniformly in large banded microstructures formed along the extrusion direction. The grain size of as-extruded specimen was around $30\~150\;{\mu}m$. As increasing the test temperature the tensile and yield strength with respect to the angle between the axis of the tensile and the longitudinal direction in extrusion was decreased, but their elongation were increased and their deviation between L and LT specimens have disappeared from $300^{\circ}C$. This mechanical anisotropy was reduced at elevated temperatures and almost disappeared at $400^{\circ}C$. It was considered that the homogenization was occured by the recrystallization and the change of slip system was occurred during tensile test process in elevated temperatures.

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참고문헌

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