J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (1): 22-28.

• Research Articles • 上一篇    下一篇

Liquid phase bonding of a 316L stainless steel to an AZ31 magnesium alloy

waled mohamed elthalabawy,Tahir I. Khan   

  1. University of Calgary, Alberta, CANADA
  • 收稿日期:2009-09-24 修回日期:2010-05-08 出版日期:2011-01-28 发布日期:2011-01-30
  • 通讯作者: waled mohamed elthalabawy

Liquid Phase Bonding of 316L Stainless Steel to AZ31 Magnesium Alloy

Waled Elthalabawy, Tahir Khan   

  1. Department of Mechanical and Manufacturing Engineering, University of Calgary, Alberta, Canada
  • Received:2009-09-24 Revised:2010-05-08 Online:2011-01-28 Published:2011-01-30
  • Contact: waled mohamedelthalabawy

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摘要： The excellent corrosion resistance, formability and strength make stainless steels versatile for diverse applications. However, its high specific strength and good crash worthiness make it suitable for the transportation and aerospace industry. On the other hand, the need to reduce the weight and thereby fuel consumption has created a renewed interest in the use of magnesium alloys. However, differences in physical and metallurgical properties of these two alloys presents challenge to join the 316L steel and AZ31 magnesium alloy using conventional fusion welding methods. Therefore, the use of liquid phase forming interlayers, which form a eutectic at temperatures lower than the melting point of steel and magnesium alloys, could overcome the differences in their physical properties. In this study both Cu and Ni interlayers were successively used to form a eutectic phase with the magnesium alloy. Intermetallics based rich in Mg-Cu-Al were formed at the joint when using the Cu interlayer and intermetallics rich in Mg-Ni-Al were produced when using the Ni interlayer. These intermetallics reduced the overall joint shear strengths, but an optimum hold time was identified at which a maximum shear strength of 57 MPa was obtained when the Cu interlayer was used and a value of 32 MPa was revealed when bonds were used with the Ni interlayer.

关键词: Magnesium alloy, Stainless steel, Eutectic Bonding, Microstructure, Shear strength

Abstract: The excellent corrosion resistance, formability and strength make stainless steels versatile for diverse applications. However, its high specific strength and good crashworthiness make it suitable for transportation and aerospace industry. On the other hand, the need to reduce the weight of vehicle and aerospace components has created renewed interest in the use of magnesium alloys. Due to their differences in physical and metallurgical properties, bonding of the 316L steel and AZ31 magnesium alloy using conventional fusion welding methods encountered many limitations. Therefore, the use of liquid phase forming interlayers is required to overcome the differences in their properties, eliminates the need for a high bonding pressure to achieve intimate contact between the bonded surfaces. Both Cu and Ni interlayers successively formed a eutectic phase with magnesium. The formation of intermetallics and Mg diffusion caused the eutectic phase to isothermally solidify with increasing bonding time. The formation of ternary intermetallic phases (λ1 and B2) impaired the bond shear strength particularly at the end of the isothermal solidification stage where no eutectic phase was observed. However, the joints showed a higher shear strength value of 57 MPa when bonding with Cu interlayer at 530°C for 30 min compared to 32 MPa when Ni interlayer was used at 510°C for 20 min.

Key words: Magnesium alloy, Stainless steel, Eutectic bonding, Microstructure, Shear strength