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Heat-resistant Al-Fe-Si aluminum alloy and preparation method thereof

An al-fe-si, aluminum alloy technology, applied in the field of heat-resistant Al-Fe-Si aluminum alloy, can solve the problem of inability to obtain alloy, harmful and equal, achieve excellent strength and toughness performance, high thermal stability of the structure, mechanical properties Enhanced effect

Active Publication Date: 2022-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Al-Fe-Si system involves three elements, and there are many kinds of iron-containing phases formed in it. Under normal conditions, it is impossible to obtain an alloy whose iron-containing phase is completely ɑ-AlFeSi, and it is inevitable to produce flaky Al. 13 Fe 4 and β-AlFeSi harmful phase
At present, there is no alloy whose microstructure containing iron phase is all ɑ-AlFeSi eutectic.

Method used

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  • Heat-resistant Al-Fe-Si aluminum alloy and preparation method thereof
  • Heat-resistant Al-Fe-Si aluminum alloy and preparation method thereof
  • Heat-resistant Al-Fe-Si aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The composition of the heat-resistant Al-Fe-Si aluminum alloy in Example 1 is calculated by mass percentage: 5% iron, 3% silicon, and the rest are Al and unavoidable impurities. According to the design ratio, pure aluminum, Al-10Fe, Al-20Si master alloys are melted and cast through the above process, vacuum sealed, and remelted at 800°C. After remelting, the quartz tube is clamped, and the samples are directly dropped into about 20°C. The water is quenched, and the alloy is cooled to room temperature in about 2s. After that, the water-cooled sample is obtained, which is Al-Fe-Si aluminum alloy. Afterwards, the mechanical properties of the Al-Fe-Si aluminum alloy were tested, and the tensile strength of the obtained alloy was 247MPa, and the elongation was 19%.

[0048] The Al-Fe-Si aluminum alloy was processed into thin slices with a thickness of 1mm by wire electric discharge, and three slices were taken and placed in a box furnace at 520°C, and heat-treated for 2 hou...

Embodiment 2

[0052] The composition of the heat-resistant Al-Fe-Si aluminum alloy in Example 2 is calculated by mass percentage: 4.8% iron, 3% silicon, and the rest are Al and unavoidable impurities. According to the design ratio, pure aluminum, Al-10Fe, Al-20Si master alloys are melted and cast through the above process, vacuum sealed, and remelted at 800°C. After remelting, the quartz tube is clamped, and the samples are directly dropped into about 20°C. The water is quenched, and the alloy is cooled to room temperature in about 2s.

[0053] After chilling, the water-cooled sample is Al-Fe-Si aluminum alloy, and then the mechanical properties of the alloy are tested. The tensile strength of the obtained alloy is 244MPa, and the elongation is 16%.

[0054] Figure 4 It is the SEM picture of the microstructure of Example 2. It can be seen from the figure that the iron-containing phases in the alloy are all fine eutectic ɑ-AlFeSi.

Embodiment 3

[0056] The composition of the heat-resistant Al-Fe-Si aluminum alloy in Example 3 is calculated by mass percentage: 5% iron, 3.5% silicon, and the rest are Al and unavoidable impurities. Melt and cast pure aluminum, Al-10Fe, Al-20Si master alloys through the above process, vacuum seal the tube, and remelt at 800°C. , about 2s alloy is cooled to room temperature. After chilling, the water-cooled sample is Al-Fe-Si aluminum alloy. Afterwards, the mechanical properties of the Al-Fe-Si aluminum alloy were tested, and the tensile strength of the obtained alloy was 252MPa, and the elongation was 15%.

[0057] Figure 5 It is the SEM picture of the microstructure of Example 3. It can be seen from the figure that the iron-containing phases in the alloy are all fine eutectic ɑ-AlFeSi.

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Abstract

The invention provides a heat-resistant Al-Fe-Si aluminum alloy and a preparation method thereof. The Al-Fe-Si aluminum alloy comprises the following components of, in percentage by mass, 4.5%-5.5% of iron, 2.8%-3.5% of silicon and the balance Al and inevitable impurities, wherein the total amount of the impurities is less than or equal to 0.06%. The preparation method comprises the steps that an Al-Fe-Si alloy cast ingot is remelted in a vacuum environment at the temperature of 750-820 DEG C, and then is chilled to obtain heat-resistant Al-Fe-Si aluminum alloy, wherein the chilling speed is larger than or equal to 300 DEG C / s. According to the preparation method, the Al-Fe-Si aluminum alloy of which an iron-containing phase is 100% of eutectic alpha-AlFeSi is obtained through cooperation of component control and remelting chilling treatment, and the eutectic alpha-AlFeSi has an extremely excellent enhancement effect, so that the Al-Fe-Si aluminum alloy has the characteristics of being high in structure heat stability and excellent in strength and toughness performance, and can be applied to parts serving at high temperature, such as engine shell bodies, pistons and the like.

Description

technical field [0001] The invention relates to a heat-resistant Al-Fe-Si aluminum alloy, belonging to the technical field of aluminum alloy preparation. Background technique [0002] Al-Si alloy is a commonly used material for automobile engines. Pure Al-Si alloy has low strength, so a small amount of Cu and Mg elements are usually added to the alloy to improve the strength of the alloy. The main strengthening mechanism is aging precipitation strengthening, and the aging heat treatment temperature is generally below 200 °C. These Mg-containing and Cu-containing precipitates will coarsen after being kept for a long time (above 100h) at a temperature of 200°C and above, and the size will become larger, the number density will decrease, and the ability to hinder dislocation movement will decrease, thereby making the strength of the alloy reduce. However, the operating temperature of an automobile engine is about 200°C, which is detrimental to the strength of the Al-Si alloy....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/02
CPCC22C21/00C22C1/026
Inventor 李凯兰新月杜勇鲁强
Owner CENT SOUTH UNIV