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A Study on the Fabrication of 2700 Series Al-alloy Sintered for Automobile Application

자동차 부품용 2700계열 Al소결체 제작에 관한 연구

  • Lim, Tae-Whan (Department of Hybrid Engineering, Sunmoon University) ;
  • Jang, Tae-Suk (Department of Hybrid Engineering, Sunmoon University)
  • 임태환 (선문대학교 하이브리드공학과) ;
  • 장태석 (선문대학교 하이브리드공학과)
  • Received : 2011.09.27
  • Accepted : 2011.12.13
  • Published : 2011.12.31

Abstract

In order to use as weight-reduced sintered parts for automobiles, mechanical properties of sintered compacts of 2712 Al-alloys containing 0, 10, 20, and 33% ceramics, respectively, were investigated in this study. (1)Regardless of ceramic contents, all sintered compacts possessed 4~7% pores. (2)After aging the compacts sintered for 12 minutes, tensile strength of the 2712 Al-alloys containing 0, 10, 20, and 33% ceramics was 165, 260, 256, and 166 N/$mm^2$, respectively, whereas those aged after sintering for 30 minutes exhibited the tensile strength of 186, 229, 219, and 202 N/$mm^2$, respectively. In addition, the 2712 sintered compact containing 10% ceramics showed the maximum elongation of about 3.6%, (3)After aging the 10% ceramic-containing sintered compacts reached a maximum apparent hardness ($H_RF$) of 97. (4)The minimum wear volume ($174{\times}10^{-3}mm^3$) was shown in the 10% ceramic-containing 2712 sintered compact after aging. From these results, the 2712 sintered compact containing 10% ceramics thought to be the most suitable one for the fabrication of aluminum engine part.

Keywords

Automobile;Sintered compact;Aging;Tensile strength;Wear

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