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Effects of silicon on microstructure and properties of Al-40Zn-xSi filler metal
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Affiliation:

南京航空航天大学,Nanjing University of Aeronautics and Astronautics

Clc Number:

TG425.2

Fund Project:

National Natural Science Foundation of China (50806007); Central Key Projects of Scientific Research in Colleges and Universities Operating Costs (CHD2011ZD008)

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    Abstract:

    Effect of Si on the brazability and microstructure of Al-40Zn-xSi filler metal was studied, the microstructure and the mechanical properties of the joints which brazed with Al-40Zn-xSi filler metal were investigated respectively. The results indicate that the Al-40Zn-xSi filler metal presents the best wettability on 6061 aluminum alloy when Si content is at 4.0 wt. %. The microstructure of the filler metal indicates that the primary silicon particles could be found when the silicon content exceeds 4.0 wt. %. Al-Si eutectic, mixed with Zn-Al eutectoid, locate at α-Al interdendritic regions in the brazing seam after cooled with water. Moreover, the Al-40Zn-4Si joint possesses the optimum shear strength at 142.28 MPa. However, excess Si would increase the amount of brittle eutectic structures and primary silicon particles in the brazed joints, and thereby decrease the mechanical properties.

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[yangjinlong, Xue Songbai. Effects of silicon on microstructure and properties of Al-40Zn-xSi filler metal[J]. Rare Metal Materials and Engineering,2016,45(2):333~338.]
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History
  • Received:March 03,2014
  • Revised:April 02,2014
  • Adopted:April 15,2014
  • Online: July 19,2016
  • Published: