Analysis of Structures at the Boundary of Contact Melting Al–Mg–Mn and Zn Based Alloys

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Abstract

The processes of contact melting of the AMg6 (Al-6%Mg-1%Mn) alloy with Zn–Cu–Al solder and the model Zn–Al alloy, as well as the structure of the contact fusion zone, are studied. Samples were obtained in two stages. At the first step, the solder was mechanically applied (tinned) to the surface of the AMg6 plates. Аt the second step, the resulting composite samples were subjected to heat treatment with a varied exposure time in the liquid state. According to the data of metallographic and X-ray diffraction analyses, as well as differential scanning calorimetry, it was shown that already at the tinning stage the active interaction between Zn and Al occurs, which leads to the formation of a developed microstructure in the joint zone. The presence of copper in the solder HTS-2000 reduces the melting point of the Zn-Al alloy by 30-40°C and improves the conditions for contact interaction with the grade AMg6 matrix. Active diffusion of zinc ensures the formation of an extensive melting zone during heat treatment, while zinc-rich areas during crystallization contain the Zn5Cu intermetallic phase, which prevents the formation of intermetallic ZnxMgy compounds, which does not lead to embrittlement of the contact zone.

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About the authors

E. А. Batalova

Udmurt Federal Research Center, UB RAS

Author for correspondence.
Email: elizaveta.smagina.97@mail.ru
Russian Federation, Izhevsk

L. V. Kamaeva

Udmurt Federal Research Center, UB RAS

Email: lara_kam@mail.ru
Russian Federation, Izhevsk

I. V. Shutov

Udmurt State University

Email: elizaveta.smagina.97@mail.ru
Russian Federation, Izhevsk

M. N. Korolev

Udmurt State University

Email: elizaveta.smagina.97@mail.ru
Russian Federation, Izhevsk

M. D. Krivilev

Udmurt Federal Research Center, UB RAS; Udmurt State University

Email: elizaveta.smagina.97@mail.ru
Russian Federation, Izhevsk; Izhevsk

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Supplementary files

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1. JATS XML
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2. Fig. 1. Morphology of the initial samples: AMg6 alloy (a), HTS-2000 solder (b) and Zn97.5Al2.5 alloy (c)

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3. Fig. 2. DSC curves of the initial alloys (a): HTS-2000 solder (1) and Zn97.5Al2.5 alloy (2), as well as AMg6 (b) when heated at a rate of v = 10°C/min

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4. Fig. 3. Morphology (a) and radiograph (b) of the solder layer after its mechanical application (tinning) to the surface of AMg6

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5. Fig. 4. Morphology (a) and RSA data (b) of HTS-2000 solder after heating to a temperature of 400 °C and cooling with v = 50-100°C/min

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6. Fig. 5. Thermogram of DSC heating with v = 10°C/min of HTS-2000/AMg6 composite obtained after tinning

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7. Fig. 6. Morphology of HTS-2000/AMg6 composites after heat treatment of TO1 (a–b) and TO2 (g–e)

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8. Fig. 7. Distribution of HTS-2000 solder components on the AMg6 substrate after TO2 according to energy dispersion analysis (a) along a line including various phases on the surface of the strip (b)

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9. Fig. 8. The structure of the Zn97.5Al2.5 alloy in the area of contact with AMg6 after TO2

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