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A high-performance aluminum alloy material modified by strontium hydride and its preparation method

An aluminum alloy material and high-performance technology, applied in the field of high-performance aluminum alloy materials and its preparation, can solve problems such as white smoke, crucible corrosion damage, unsafe operation, etc., achieve good metamorphic effects and reduce overall costs

Inactive Publication Date: 2016-03-09
GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the sodium salt modification method is low, and the preparation is relatively simple. It is suitable for products with small batches and low requirements. Its disadvantages are: sodium is a chemically active element. Both the human body and the environment are harmful, and the operation is not safe, especially the crucible is easy to be corroded and damaged, and its effective time for full deterioration is short, generally no more than 1h
Its disadvantages are: the cost is higher than that of sodium salt, and it must be formulated into an intermediate alloy in advance, and it does not have the effect of dispersing the shrinkage of castings like sodium salt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1, select a group of elements according to the formula, in terms of weight ratio: the alloy composition is Cu: 1.4%, Mn: 0.4%, Mg: 1.5%, Cr: 0.1%, Zn: 4.0%, Ti: 0.01%, Modifier SrH 2 It is 0.2% of the total charge, and the rest is Al and unavoidable trace impurities, among which unavoidable trace impurities, Si and Fe are impurities brought by raw materials, and the content of impurity elements is: single ≤ 0.03%, total ≤0.15%, Si: ≤1.0%, Fe: ≤1.0%; the total amount of alloy prepared is 1000kg, then the weight of each substance required is calculated as: Cu: 14kg, Mn: 4kg, Mg: 15kg, Cr : 1kg, Zn: 40kg, Ti: 0.1kg, Al: 923.9kg, SrH 2 : 2kg;

[0023] Step 2: Add aluminum ingots or molten aluminum into the melting furnace, heat it to melt it completely and keep it warm at 700-800°C; the melting process is completed in a closed environment;

[0024] Step 3: Add the alloy elements selected in Step 1 according to the proportion of the formula to completely dissolve and...

Embodiment 2

[0029] Step 1: Select a group of elements according to the formula, and in terms of weight ratio: the alloy composition is Cu: 1.45%, Mn: 0.45%, Mg: 1.75%, Cr: 0.15%, Zn: 4.25%, Ti: 0.0125%, Modifier SrH 2 It is 0.075% of the total charge, and the rest is Al and unavoidable trace impurities. The unavoidable trace impurities, Si and Fe are all impurities brought by the raw materials, and the content of impurity elements is: single ≤ 0.03%, total ≤0.15%, Si: ≤1.0%, Fe: ≤1.0%; the total amount of the prepared alloy is 1000kg, then the weight of each substance required is calculated as: Cu: 14.5kg, Mn: 4.5kg, Mg: 17.5 kg, Cr: 1.5kg, Zn: 42.5kg, Ti: 0.125kg, Al: 918.63kg, SrH 2 : 0.75kg;

[0030] Step 2: Add aluminum ingots or molten aluminum into the melting furnace, heat it to melt it completely and keep it warm at 700-800°C; the melting process is completed in a closed environment;

[0031] Step 3: Add the alloy elements selected in Step 1 according to the proportion of the f...

Embodiment 3

[0036] Step 1: Select a group of elements according to the formula, and by weight ratio: the alloy composition is Cu: 1.5%, Mn: 0.5%, Mg: 2.0%, Cr: 0.2%, Zn: 4.5%, Ti: 0.15%, Modifier SrH 2 It is 0.01% of the total charge, and the rest is Al and unavoidable trace impurities. The unavoidable trace impurities, Si and Fe are all impurities brought by the raw materials, and the content of impurity elements is: single ≤ 0.03%, total ≤0.15%, Si: ≤1.0%, Fe: ≤1.0%; the total amount of alloy prepared is 1000kg, then the weight of each substance required is calculated as: Cu: 15kg, Mn: 5kg, Mg: 20kg, Cr : 2kg, Zn: 45kg, Ti: 1.5kg, Al: 911.4kg, SrH 2 : 0.1kg;

[0037]Step 2: Add aluminum ingots or molten aluminum into the melting furnace, heat it to melt it completely and keep it warm at 700-800°C; the melting process is completed in a closed environment;

[0038] Step 3: Add the alloy elements selected in Step 1 according to the proportion of the formula to completely dissolve and me...

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PUM

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Abstract

The invention discloses a high-performance aluminum alloy material modified by strontium hydride and a preparation method thereof. According to the weight ratio, the alloy composition is Cu: 1.4-1.5%, Mn: 0.4-0.5%, Mg: 1.5-2.0%, Cr: 0.1~0.2%, Zn: 4.0~4.5%, Ti: 0.01~0.15%, Si: ≤1.0%, Fe: ≤1.0%, the modifier SrH2 is 0.15~0.2% of the total charge, and the rest are Al and Unavoidable trace impurities, and the content of impurity elements is: single ≤ 0.03%, total ≤ 0.15%, the high-performance aluminum alloy material modified by strontium hydride of the present invention has a finer grain structure and higher purity.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to a high-performance aluminum alloy material modified by strontium hydride and a preparation method thereof. Background technique [0002] Modification can greatly improve the comprehensive mechanical properties and chemical stability indicators of aluminum alloys, sometimes even subversively. Substances capable of altering are called modificators. [0003] 1) Modification method of sodium salt modification agent Na can change the crystallization of eutectic silicon from short round needles to fine grains, reduce the eutectic temperature, increase the degree of supercooling, and refine the crystal grains. Its refinement effect is better for cold and slow sand and plaster castings, and it also has the effect of dispersing the shrinkage of castings (ingots), which plays an important role in castings that require good air tightness. The cost of the sodiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C21/02C22C21/06
Inventor 张中可门三泉车云倪斌
Owner GUIZHOU HUAKE ALUMINUM MATERIAL ENG TECH RES