Abstract
Aluminum alloys based on the Al-Ge-Si system with a germanium content of up to 40 wt.%, promising for the brazing of aluminum alloy AA6082 with the stainless steel AISI 304, were studied. The temperature characteristics and microstructural and mechanical properties of the filler alloys were systematically investigated. Differential scanning calorimetry showed that with an increase in the germanium content from 28.0 to 40.0 wt.%, the liquidus temperature of the filler alloys decreased from 514.8 to 474.3 °C. X-ray diffraction analysis and electron microscopy data showed that the foil of the filler alloys reveals a homogeneous structure. The ingots of the alloys contain two eutectics, the first of which consists of a solid solution of (Al, Ge) with a solid solution of (Ge, Si), and the second consists of a solid solution of (Al, Ge) with a solid solution based on (Ge). When the content of germanium increases from 28.0 to 40.0 wt.%, a separation of the faceted solid solution particles (Ge, Si) and an increase in their number could be observed. Nanohardness measurements showed that the (Ge, Si) and (Ge) solid solutions had similar nanohardness, with values of 11.6 and 10.2 GPa, respectively. Simultaneously, the Al solid solution and the intermetallic Al7Ge2Fe phase exhibited significantly lower nanohardness values of 0.7 and 6.7 GPa, respectively. Brinell hardness measurements showed that the ingots of the filler alloys were sufficiently ductile and had a hardness comparable to that of AA6082, which is used for brazing with AISI 304 stainless steel. The obtained results for the studied ingots and the rapidly quenched foils can be used to predict the forming structure of the seam after brazing and adjusted for diffusion processes occurring between the brazed materials and the studied filler alloys.
Highlights
With the development of modern technologies, attention to lightweight materials has increased in all industries, resulting in a desire for in-depth research into high-strength aluminum alloys
The molten filler alloy was cooled to 60 ◦ C at the same rate
The thermal cycle was repeated with a drop of the filler alloy formed during equilibrium crystallization
Summary
With the development of modern technologies, attention to lightweight materials has increased in all industries, resulting in a desire for in-depth research into high-strength aluminum alloys. Aluminum alloys are widely used in the automotive, aerospace, and electronics industries [1,2,3]. The task of reducing the weight of vehicles and aircraft through the use of lighter materials is caused by the desire to save fuel, economic benefits, and the environmental agenda [4]. Aluminum alloys are used as radiator materials for heat dissipation devices, cylinder blocks, car body cladding, and so on [5,6,7]. Aluminum alloys of the 2XXX and 7XXX series are mainly used in the manufacture of aircraft frames, spars, and load-bearing elements [8,9,10].
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