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300 MPa-grade high-strength and high-plasticity non-heat treatable self-strengthening die-casting aluminum alloy and manufacturing method

A non-heat treatment, cast aluminum alloy technology, which is applied in the field of 300MPa high-strength plastic non-heat-treated self-reinforced die-casting aluminum alloy and its manufacturing field, which can solve the problem of difficulty in meeting the processing needs of high-strength industrial parts, low tensile strength, low yield strength and elongation, etc. Problems, to achieve the effect of low die casting process performance, good fluidity, and reduce thermal cracks

Inactive Publication Date: 2020-04-10
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its overall tensile strength, yield strength, and elongation are still relatively low, and it is difficult to meet the processing needs of high-strength industrial parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The embodiment of the present invention provides a 300MPa grade high-strength plastic non-heat-treated self-strengthening die-casting aluminum alloy, the nominal composition is Si: 7.5%, Cu: 1.0%, Fe: 0.2%, Mn: 0.7%, Mg: 0.40%, Ti: 0.1 %, Cr: 0.05%, Sr: 0.03%, the balance Al (content is mass percentage).

[0034] The raw materials used are 99.70% (content is mass percentage, the same below) industrial pure aluminum, 99.95% pure magnesium and Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys, using crucibles The resistance furnace smelts alloys.

[0035] The manufacturing method of 300MPa high-strength plastic non-heat-treated self-strengthening die-cast aluminum alloy includes the following steps:

[0036] S1. After the pure aluminum ingot is remelted, add Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys in sequence after the furnace is heated to a temperature of 730°C until the raw materials are completely melted. Obtain molten metal A.

[0037] S2. Keep the...

Embodiment 2

[0041] The embodiment of the present invention provides a 300MPa grade high-strength plastic non-heat-treated self-strengthening die-casting aluminum alloy, the nominal composition is Si: 8.5%, Cu: 1.3%, Fe: 0.3%, Mn: 0.9%, Mg: 0.35%, Ti: 0.15 %, Cr: 0.08%, Sr: 0.025%, the balance Al (content is mass percentage).

[0042] The raw materials used are 99.70% (content is mass percentage, the same below) industrial pure aluminum, 99.95% pure magnesium and Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys, using crucibles The resistance furnace smelts alloys.

[0043] The manufacturing method of 300MPa high-strength plastic non-heat-treated self-strengthening die-cast aluminum alloy includes the following steps:

[0044] S1. After the pure aluminum ingot is remelted, add Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys in sequence after the furnace is heated to a temperature of 740°C until the raw materials are completely melted. Obtain molten metal A.

[0045] S2. Keep t...

Embodiment 3

[0049] The embodiment of the present invention provides a 300MPa grade high-strength plastic non-heat-treated self-strengthening die-casting aluminum alloy, the nominal composition is Si: 8.0%, Cu: 1.2%, Fe: 0.25%, Mn: 1.0%, Mg: 0.5%, Ti: 0.2 %, Cr: 0.1%, Sr: 0.02%, the balance Al (content is mass percentage).

[0050] The raw materials used are 99.70% (content is mass percentage, the same below) industrial pure aluminum, 99.95% pure magnesium and Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys, using crucibles The resistance furnace smelts alloys.

[0051] The manufacturing method of 300MPa high-strength plastic non-heat-treated self-strengthening die-cast aluminum alloy includes the following steps:

[0052] S1. After the pure aluminum ingot is remelted, add Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr, Al-10Sr master alloys in sequence after the furnace is heated to a temperature of 730°C until the raw materials are completely melted. Obtain molten metal A.

[0053] S2. Keep the ...

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Abstract

The invention discloses a 300MPa-grade high-strength and high-plasticity non-heat treatable self-strengthening die-casting aluminum alloy and a manufacturing method. The 300MPa-grade high-strength andhigh-plasticity non-heat treatable self-strengthening die-casting aluminum alloy is prepared from components in percentage by mass as follows: 7.5%-8.5% of Si, 1.0%-1.3% of Cu, 0.1%-0.3% of Fe, 0.7%-1.0% of Mn, 0.35%-0.5% of Mg, 0.1%-0.2% of Ti, 0.05%-0.1% of Cr, 0.02%-0.03% of Sr and the balance Al. The manufacturing method comprises the following steps: after remelting a pure aluminum ingot, melting in other components, and after complete melting, uniformly stirring the components until no sediments exist at the bottom of a furnace; keeping molten metal at 720 DEG C at constant temperaturefor 30 min, performing deslagging and degassing, decreasing the temperature of the molten metal to 680-690 DEG C, and pressing pure Mg wrapped by aluminum foil into molten aluminum by a bell jar; carrying out uniform stirring for 5-10 min after complete smelting, and carrying out deslagging; and after smelting, casting the molten metal into a metal die by a horizontal cold chamber die-casting machine to obtain an alloy casting. The manufactured non-heat treatable self-strengthening die-casting aluminum alloy has tensile strength up to 300 MPa or above and elongation larger than or equal to 8%before heat treatment, so that the aluminum alloy is a novel high-strength and high-plasticity aluminum alloy and can be popularized and used in the industry.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal materials, and specifically relates to a 300MPa grade high-strength plastic non-heat-treatment self-strengthening die-cast aluminum alloy and a manufacturing method. Background technique [0002] Aluminum and aluminum alloys have the characteristics of low density, high specific strength, good plasticity, excellent mechanical properties, low thermal expansion coefficient, good corrosion resistance, excellent electrical and thermal conductivity, easy processing, and recyclability. They are used in aviation, aerospace, automotive , Machinery manufacturing, shipbuilding, chemical industry and packaging have been widely used, becoming the most widely used non-ferrous metal material in modern industry (especially the automobile industry), and it is also a green and sustainable non-ferrous metal. material. The density of aluminum alloy is only about 1 / 3 of that of steel. Studies have shown that re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06B22D17/00
CPCB22D17/00C22C1/026C22C1/03C22C1/06C22C21/04
Inventor 郭纯丁胜长辛锐王飞胡瑞章陈丰魏宝丽张华
Owner ANHUI SCI & TECH UNIV
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