heat resistant aluminum alloy
A technology of aluminum alloy and alloy, which is applied in the field of aluminum metallurgy, can solve problems such as the price drop of alloys, and achieve the effect of high thermal conductivity and increased electrical conductivity
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Embodiment 1
[0028] In order to confirm that the alloy structure is distributed with Al 3 Zr L1 2 In the laboratory, seven alloy compositions were prepared (Table 1). The alloy is prepared from aluminum (99.95) and Al-20Ni, Al-10Fe, Al-15Zr master alloys in a graphite crucible in a resistance furnace. The alloy is obtained in the form of flat ingots of 200 x 40 mm, by intermediate heat treatment using a maximum heating temperature of 460 °C for the decomposition of the aluminum matrix and the formation of Al 3 Zr L1 2 The secondary phase particles were further rolled into 2 mm thick sheets at room temperature from the ingot. The alloy melting and casting was maintained at 800°C for alloys 1-4, and the alloy melting and casting was maintained at 850°C for alloys 5-7. Rolling from 40mm to 10mm thickness is kept at 400°C, and rolling from 10mm to 2mm is kept at room temperature.
[0029] Relative to Δσ=(σ 0 -σ т ) / σ 0 , to evaluate the strength property loss (Δσ), where σ 0 is the te...
Embodiment 2
[0039] Samples with various structural parameters, in particular alloyed aluminum matrices containing variable zirconium mass concentrations, were obtained from the claimed alloys with compositions 3, 6 and 5 (Table 1). The remaining zirconium is Al 3 Zr L1 2 The form of secondary precipitates. The variable zirconium concentration is achieved by changing the annealing temperature of the sheet in the range of 350°C to 460°C, while "1" (100% Zr) in the aluminum melt corresponds to the casting condition value.
[0040] Table 3 shows that only when the zirconium content in the aluminum solution is reduced to less than 1 / 3 of the total zirconium content in the alloy, the claimed alloy composition achieves the required resistivity of not less than 59.1% IACS and not less than 220W / (m·K) thermal conductivity.
[0041] Table 3 – Electrical conductivity - Zr mass fraction in aluminum solution (Al)
[0042]
[0043] 1 - Alloy composition see Table 1
Embodiment 3
[0045] Samples with various structural parameters, especially with variable Al 3 Zr L1 2 Samples of phase secondary precipitates, obtained from the claimed alloy with composition 3 (Table 1). Different sizes of Al are achieved by using various heat treatments 3 Zr1 2 phase secondary precipitates. Evaluation of the relative loss of strength properties after heat treatment at 400°C for 1 hour Δσ=(σ 0 -σ т ) / σ 0 .
[0046] Table 4 shows that only when Al 3 Zr L1 2 When the particle size of the phase is not less than 16 nm, the reduction in tensile strength may not exceed 10%.
[0047] Table 4 – Relative loss of strength properties of experimental alloys after heating
[0048]
[0049] 1 - Alloy composition see Table 1
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