Simultaneous Improvement of Thermal Conductivity and Strength for Commercial A356 Alloy Using Strontium Modification Process

Kang Wang; Wenfang Li; Wenzhi Xu; Shengyu Hou; Shaodong Hu

doi:10.1007/s12540-020-00669-x

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자료유형: 학술저널

저자정보: Kang Wang (Dongguan University of Technology) Wenfang Li (Dongguan University of Technology) Wenzhi Xu (Guangdong University of Technology) Shengyu Hou (Guangdong University of Technology) Shaodong Hu (Dongguan University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.11

발행연도: 2021.11

수록면: 4,742 - 4,756 (15page)

DOI: 10.1007/s12540-020-00669-x

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The Aluminum?Silicon (Al?Si) die-casting alloys, such as the commercial A356 alloy, are expected to be used in heat-sinkand the device with high thermal conductivity due to their high production efficiency of casting process. These fields alsorequired them to possess sound mechanical properties. To meet these demands, the Strontium (Sr) was often utilized tomodify the silicon phase. According to our current work, the secondary dendrite arm spacing of the α-Al grains prominentlywas decreased when 0.05%?0.25% strontium was added. The decrease of the secondary dendrite arm spacing (SDAS) lead tothe enhancement of the mechanical strength as well as the improvement of the thermal and electrical conductivity. When theSr dosage was 0.15% in the commercial A356 alloy, the strength and the thermal conductivity of the A356 alloy simultaneouslyreached the maximum value. The improvement of the electrical and thermal conductivity might by contributed by theformation of a good conductor, Al2Si2Srphase, on the Si surface. Further investigations suggested that the improvement ofthermal conductivity was mainly due to the modification effect of Sr on the eutectic Si phase, which enlarged the specificarea between the α-Al/eutectic Si interface. The WDS analysis indicated that the solubility of Si decreased in aluminummatrix by increasing in the Sr dosage. However, the excessive dosage of strontium would result in the coarsening of themodified silicon phase, deteriorating the strength and the thermal and electrical conductivity of the modified A356 alloys.

#Al?Si die casting alloy #Sr modification #Thermal conductivity #Strength

참고문헌 (45)

참고문헌 신청

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