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High strength heat resistant aluminium alloy

A technology for heat-resistant alloys and aluminum alloys, applied in the field of casting aluminum-silicon alloys and high-strength heat-resistant aluminum alloys, can solve the problems of low stable working temperature, high cost, and no literature reports on alloy materials have been found, and achieve high-temperature mechanical properties. , high dimensional stability, the effect of solving performance stability problems

Inactive Publication Date: 2007-10-03
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention of Chinese Patent Publication No. 1556236 is "Titanium alloyed Al-Cu-Ag series high-strength heat-resistant aluminum alloy". There is no silicon in it, it is an aluminum-copper alloy, and the composition also contains silver, so its cost is also relatively high, and more importantly, the stable working temperature of the alloy is less than 300°C
[0010] After searching in existing information systems and networks, it has not been found that there are completely identical bibliographical reports with the alloy material and performance of the present invention

Method used

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Examples

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Effect test

Embodiment 1

[0044]Referring to Fig. 1, the alloy of the present invention is welded by alloy smelting method, and its chemical composition (wt%) is as follows: Si: 12.5, Cu: 3.5, Ni: 1.5, Mn: 0.7, Mg: 0.8, Ti: 0.1, B: 0.08, Zr: 0.6, Cd: 0.2, P: 0.03, and the rest are aluminum, Si / Mg is 15.6, and Cu / Mg is 4.375. Put industrial pure aluminum, pure magnesium, crystalline Si, electrolytic nickel Ni, electrolytic copper Cu, titanium Ti, manganese Mn or Al-Si, Al-Cu, Al-Ti, Al-Mn, Al-Ni master alloy in the crucible furnace Melting, pouring parts after refining, metamorphism, and static. The room temperature tensile strength of the obtained material is 320-380MPa, and the high-temperature (350°C) tensile strength is 120-160MPa, which is 3-4 times of the tensile strength of ordinary aluminum-silicon alloy under the same experimental conditions. The hardness is 50% higher than that of the aluminum-silicon matrix alloy, and the elastic modulus is 40% higher than that of the aluminum-silicon matrix...

Embodiment 2

[0046] The preparation method is the same as in Example 1, and the alloy of the present invention is prepared by using the alloy smelting technology. Its chemical composition (wt%) is as follows: Si: 6.5, Cu: 3.5, Ni: 1.5, Mn: 0.7, Mg: 0.6, Ti: 0.1, B: 0.08, Zr: 0.6, Cd: 0.2, P: 0.03, the rest It is aluminum, Si / Mg is 10.8, and Cu / Mg is 5.8. Figure 3 is a photo of the as-cast metallographic structure of the alloy

Embodiment 3

[0048] The preparation method is the same as in Example 1, and the alloy of the present invention is prepared by using the alloy smelting technology. Its chemical composition (wt%) is as follows: Si 17.5, Cu: 5.0, Ni: 1.5, Mn: 0.7, Mg: 0.9, Ti: 0.1, B: 0.08, Zr: 0.6, Cd: 0.2, P: 0.03, and the rest are Aluminum, Si / Mg is 19.4, Cu / Mg is 5.55. Figure 4 shows the alloy coherent nanophase Al 3 TEM topography of Ti; Figure 5 is the coherent nanophase TiB of the alloy 2 The TEM topography of the alloy, its size is 120 nanometers, Figure 6 is the alloy nanophase TiB 2 Diffraction spots, Figure 7 is the alloy nanophase TiB 2 Photo of the coherent relationship with the base aluminum.

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Abstract

The present invention is one kind of high strength heat resistant aluminum alloy capable of being used at 300-400 deg.c for long period. The high strength heat resistant aluminum alloy consists of Si 6.5-17.5 wt%, Cu 2.0-5.0 wt%, Ni 1.0-3.0 wt%, Mn 0.4-1.0 wt%, Mg 0.4-1.2 wt%, Ti 0.1-1.0 wt%, B 0.02-0.2 wt%, Zr 0.1-1.0 wt%, Cd 0.1- 0.6 wt%, P 0.005-0.05 wt%, and Al for the rest, and has Si / Mg ratio of 10-20 and Cu / Mg ratio of 4-13. The alloy includes Al3X grains with homogeneously distributed L12 crystal structures and TiB2 grains with homogeneously distributed hcp crystal structures possessing high heat stability, and grain fining and high temperature strengthening effects. The high strength heat resistant aluminum alloy may be made into part through cheap casting or used as the base material for composite material.

Description

technical field [0001] The invention relates to metal materials, in particular to cast aluminum-silicon alloys used at high temperatures, specifically high-strength heat-resistant aluminum alloys. Background technique [0002] Aluminum alloy is a light metal structure material with high specific strength and specific modulus, excellent machining performance, good corrosion resistance, excellent vibration damping performance and cutting performance, and can withstand certain shock and vibration loads , the use of aluminum alloys can reduce the weight of the product, reduce processing energy, and reduce energy consumption, so aluminum alloys are widely used in aircraft, automobiles, motorcycles and other industries. [0003] Aluminum-silicon alloy is the most widely used aluminum alloy, accounting for 85% to 90% of aluminum alloy castings in the automotive industry. According to the silicon content, it can be divided into: hypoeutectic aluminum-silicon alloy (<12wt%Si), eu...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22F1/04C22C1/03
Inventor 李建平杨忠杨觉民郭永春李高宏夏峰杨通
Owner XIAN TECHNOLOGICAL UNIV
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