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High-strength heat-resistant aluminum alloy suitable for large-scale complex structure castings and its preparation process

A preparation process and aluminum alloy technology, applied in the field of cast aluminum alloy materials and its preparation, high-strength heat-resistant cast aluminum alloy and its preparation, to achieve the effects of improving thermal crack resistance, excellent room temperature and high temperature mechanical properties, and solving room temperature brittleness

Active Publication Date: 2019-12-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these efforts have not fundamentally solved the problem of hot cracking tendency of Al-Cu based casting alloys
So far, the existing Al-Cu cast aluminum alloys can only cast small-sized castings

Method used

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  • High-strength heat-resistant aluminum alloy suitable for large-scale complex structure castings and its preparation process
  • High-strength heat-resistant aluminum alloy suitable for large-scale complex structure castings and its preparation process
  • High-strength heat-resistant aluminum alloy suitable for large-scale complex structure castings and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0036] The alloy composition is: 7.70% Cu, 1.22% Ag, 0.22% Mg, 0.20% Mn, 0.22% V, 0.05% Ti, 0.02% Fe, 0.03% Si, Cu / Mg=35, the balance is Al, and each group The sum of the points is 100%.

[0037] The smelting and casting process of the alloy follows the following steps: (1) According to the above formula, configure 3kg of the cast aluminum alloy material, wherein Al, Ag, and Mg are pure metals, Fe, Si are impurity elements, and the remaining elements are an intermediate alloy of aluminum, Clean the surface of the above metal, free from dust and oil, wrap the pure Mg tightly with aluminum foil, and then bake it at 150-200°C for 1-2h; (2) first melt the pure Al in a melting furnace at 760°C, and then add Pure Ag and Al-Cu, Al-Mn, Al-V intermediate alloys, after they are all melted, pass high-purity argon to degas the melt for 25 minutes, control the temperature of the melt at 735°C after removing slag, and use a clock Press the Mg into the melt under the hood, stir the melt slo...

Embodiment 1-2

[0040] The alloy composition is: 6.61% Cu, 0.60% Ag, 0.11% Mg, 0.50% Mn, 0.10% V, 0.15% Ti, 0.04% Fe, 0.06% Si, Cu / Mg=60, the balance is Al, and each group The sum of the points is 100%.

[0041] The melting and casting process of the alloy is the same as in Example 1-1.

[0042] The test rod is firstly subjected to solution heat treatment at 525°C / 10h, and then to artificial aging heat treatment at 180°C / 4h (T6 state). The room temperature and high temperature tensile properties of the T6 state test bars are shown in Table 1.

Embodiment 1-3

[0044] The alloy composition is: 6.40% Cu, 1.70% Ag, 0.38% Mg, 0.34% Mn, 0.35% V, 0.09% Ti, 0.06% Fe, 0.02% Si, Cu / Mg=16.8, the balance is Al, and each group The sum of the points is 100%.

[0045] The melting and casting process of the alloy is the same as in Example 1-1.

[0046] The test rod is firstly subjected to solution heat treatment at 530°C / 4h, and then to artificial aging heat treatment at 160°C / 14h (T6 state). The room temperature and high temperature tensile properties of the T6 state test bars are shown in Table 1.

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Abstract

The invention relates to a high-strength heat-resistant cast aluminum alloy material and a preparation process thereof which are suitable for casting large-size castings. A high-strength heat-resistant cast aluminum alloy comprises, by mass, 6.0-7.7% of Cu, 0.6-1.7% of Ag, 0.10-0.38% of Mg, 0.2-0.5% of Mn, 0.10-0.35% of V, 0.05-0.15% of Ti, no less than 15% and no more than 60% of Cu / Mg ratio, nomore than 0.06% of Fe, no more than 0.06% of Si, and the balance Al and other unavoidable impurity elements. The preparation process includes smelting and casting of the alloy and solid solution agingheat treatment of the castings. According to the high-strength heat-resistant cast aluminum alloy material and the preparation process thereof, the large-size castings with good heat resistance, roomtemperature mechanical properties and cutting machining properties can be casted.

Description

technical field [0001] The invention relates to a cast aluminum alloy material and a preparation method thereof, in particular to a high-strength heat-resistant cast aluminum alloy suitable for large-scale complex structure castings and a preparation process thereof, belonging to the technical field of non-ferrous metal materials. Background technique [0002] With the rapid development of China's aviation, aerospace and other industrial fields, the demand for large-scale high-strength and heat-resistant aluminum alloy structural parts is also increasing. Generally speaking, Al-Si series cast aluminum alloys have excellent process performance, and there is no problem in the preparation process of large-scale aluminum alloy castings prepared from Al-Si series cast aluminum alloy materials. For example, the Chinese invention patent application with the application publication number CN101844218A has disclosed "A Low-Pressure Casting Process for Aluminum Alloy Cylindrical Parts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22C1/03C22F1/057
CPCC22C1/026C22C1/03C22C21/16C22F1/002C22F1/057
Inventor 刘志义王建曹靖应普友刘冠华柏松
Owner CENT SOUTH UNIV
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