Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2012 - zeszyt 1

Structure and mechanical properties of soldered joints of AZ61 magnesium alloy

nr katalogowy: 68014

Magnesium and its alloys, possessing excellent properties of extremely low density, high specific strength and good castability, have been widely used in various fields of industry. To broaden out fields of application of magnesium alloys it is necessary to develop filler metals for brazing or soldering magnesium alloys which would enable to obtain satisfactory joint. Conventional methods like welding, brazing, soldering are used for joining magnesium alloys, but these methods run into several difficulties. Magnesium has high affinity with oxygen and the magnesium surface is covered with a thick and very stable oxide film (MgO) which is very difficult to reduce [1]. Low melting temperature and low recrystallization temperature limit the amount of metals that can be used for brazing and soldering. For brazing magnesium alloys filler metals are based on Mg or Zn with the addition of Al, Mn and Zr [2]. Watanabe et al. [3] investigated filler metals for brazing magnesium alloy AZ31B and they developed filler metal composed of In, Mg and Zn with a melting point below 480°C. They also found out that the cross tensile load of the brazed joint decreased as the Zn content in the filler metal increased. Recent investigations made by Liu and Wu [4] showed that there is a possibility of soldering magnesium alloy AZ31B with the filler metal composed of 95% Zn and with the addition of Al, Mn, and Mg at soldering temperature 390°C. There is lack of information about soldering magnesium alloys with higher addition of Al and this paper is focused to investigate filler metals for soldering magnesium alloy AZ61. Experimental procedure The rod of magnesium alloy AZ61 with a diameter of 10 mm was cut into pieces to the length of 10 mm. Each sample consists of two pieces soldered using filler metal based on zinc. There were three compositions of the filler metal: zinc of purity 99.995 wt % (Zn), zinc with 0.15 wt % Cu (ZnCu) and zinc w[...]

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