Cast aluminum alloy and its preparation method
A technology for casting aluminum alloys and alloys, which is applied in the field of casting aluminum alloys, can solve the problems of poor high-temperature durability, low strength, and reduced mechanical properties, and achieve the effect of improving high-temperature strength
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Embodiment 1
[0028] Example 1 Cast aluminum alloy X1
[0029] Including the following components by weight percentage: Cu: 5.0%; Ni: 1.3%; Mn: 0.4%; Ti: 0.25%; V: 0.25%; other impurities Si<0.1%; Fe<0.1%; Zn<0.1%; Al balance.
[0030] Such as figure 1 As shown, the structure of the X1 alloy is fine and uniform, and the grains are mainly in the form of cells or dendrites. There are θ(Al2Cu) phases, Al3Ni phases and Al6Cu3Ni phases distributed between the dendrites or on the grain boundaries, and T(Al12CuMn2 ) phase and Al7V phase, due to the less content of θ (Al2Cu) phase, the mechanical properties at room temperature are low, generally 320-340MPa.
Embodiment 2
[0031] Embodiment 2 cast aluminum alloy X2
[0032] Including the following components by weight percentage: Cu: 5.2%; Ni: 1.0%; Mn: 0.3%; Ti: 0.2%; V: 0.1%; other impurities Si<0.1%; Fe<0.1%; Zn<0.1%; Al balance.
[0033] Such as figure 2 As shown, the content of Ti and V in X2 alloy is less, and the effect of Ti and V on the grain refinement is weakened. The grain size in the alloy structure is 2 to 3 times that of the X1 alloy grain size, and the grains are in the form of block or cell Existence, the skeletal Al6Cu3Ni phase with larger size between dendrites splits the matrix structure, the dispersed particles distributed in the grain are less than X1, the mechanical properties at room temperature are lower, not higher than 320MPa, and the high temperature mechanical properties are lower. The tensile strength is not higher than 120MPa.
Embodiment 3
[0034] Embodiment 3 cast aluminum alloy X3
[0035] Including the following components by weight percentage: Cu: 5.3%; Ni: 1.2%; Mn: 0.35%; Ti: 0.22%; V: 0.2%; other impurities Si<0.1%; Fe<0.1%; Zn<0.1%; Al balance.
[0036] Such as image 3 As shown, the microstructure of X3 alloy is mainly cellular or dendritic, and the grain size is consistent with X1, but the interdendritic θ(Al2Cu) phase and the dispersed particles distributed in the grain are more than X1, and it has higher room temperature and high temperature than X1. mechanical properties.
[0037] The prepared aluminum alloy X3 test bar was subjected to tensile tests at room temperature and 320°C respectively, and the strength and elongation at different temperatures were obtained. The results are shown in Table 1 and Table 2.
[0038] Table 1. Mechanical properties of the alloy at room temperature
[0039]
[0040] Table 2. Mechanical properties of the alloy at 320°C
[0041]
[0042]
[0043] It can b...
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Abstract
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