CN115029594A - Wrought magnesium alloy and preparation method thereof - Google Patents
Wrought magnesium alloy and preparation method thereof Download PDFInfo
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- CN115029594A CN115029594A CN202210701456.5A CN202210701456A CN115029594A CN 115029594 A CN115029594 A CN 115029594A CN 202210701456 A CN202210701456 A CN 202210701456A CN 115029594 A CN115029594 A CN 115029594A
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- magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Abstract
The invention discloses a wrought magnesium alloy and a preparation method thereof, wherein the wrought magnesium alloy comprises the following components in percentage by weight: 1-7% of Al, 0.6-2% of Mn, 0.5-1.5% of Zn, and the balance of Mg and inevitable impurities. The method can improve the content of Mn element in the Mg-Al-Mn series wrought magnesium alloy, so that Mn and Al generate more Al-Mn phases, and the solid solution strengthening and second phase strengthening effects of the Mn element in the magnesium alloy are improved, thereby obtaining the magnesium alloy with more excellent structure performance. The preparation method comprises the following steps: taking pure magnesium, pure zinc, pure aluminum and magnesium-manganese intermediate alloy as raw materials, and calculating and batching according to the component content of the magnesium alloy; putting the pure magnesium, magnesium and manganese intermediate alloy into a smelting furnace, completely smelting to obtain a melt, adding preheated pure aluminum and pure zinc into the completely smelted melt, preserving heat to completely smelt the pure aluminum and the pure zinc, stirring and removing surface scum, and then preserving heat for 10-15 minutes under the condition that the temperature is 740 +/-10 ℃; and step three, casting to obtain a magnesium alloy ingot.
Description
Technical Field
The invention relates to the field of metal materials, in particular to a wrought magnesium alloy and a preparation method thereof.
Background
Compared with the traditional structural materials including steel and aluminum alloy, magnesium and magnesium alloy have a series of advantages, such as low density, high specific strength and specific stiffness, high damping property, high thermal conductivity, good electromagnetic shielding effect, excellent machining performance and stable and easily-recycled part size, and become one of the structural materials with application prospects at present. However, because magnesium alloy has low absolute strength and poor plasticity due to lack of sufficient independent slip system, the structure can be optimized and the performance can be improved by adding other alloy elements into the magnesium alloy through an alloying method. The Mn element is used as an alloying element with low price, can reduce the difference value of the basal plane sliding resistance and the non-basal plane sliding resistance in the magnesium alloy, activate the non-basal plane sliding resistance, can separate out a fine second phase to prevent the recrystallization grains from growing, and can reduce the content of impurity element Fe and obviously improve the corrosion resistance of the alloy.
The Mg-Al-Mn alloy is a novel low-cost high-performance wrought magnesium alloy in recent development, and has the advantages of good mechanical property, good corrosion resistance and the like. CN105603281A discloses a low-cost high-performance Mg-Al-Mn alloy, the comprehensive mechanical properties of the obtained as-cast alloy are superior to those of the traditional commercial magnesium alloy AZ91 with equivalent cost, and the strength, toughness and formability of the deformed alloy are superior to those of the traditional commercial magnesium alloy AZ 31. However, in practical production applications, the Mn content of Mg-Al-Mn alloys is often lower than the designed nominal composition and a large amount of slag is formed during smelting. Therefore, the Mn content in the Mg-Al-Mn alloy is increased, which is beneficial to improving the structure and the performance of the alloy and can avoid resource waste.
Disclosure of Invention
The invention aims to provide a wrought magnesium alloy and a preparation method thereof, which can improve the content of Mn element in Mg-Al-Mn series wrought magnesium alloy, enable Mn and Al to generate more Al-Mn phases, and improve the solid solution strengthening and second phase strengthening effects of the Mn element in the magnesium alloy, thereby obtaining the magnesium alloy with more excellent structure property.
The wrought magnesium alloy comprises the following components in percentage by weight: 1-7% of Al, 0.6-2% of Mn, 0.5-1.5% of Zn, and the balance of Mg and inevitable impurities.
Further, the paint comprises the following components in percentage by weight: 3-6% of Al, 1% of Mn, 1% of Zn, and the balance of Mg and inevitable impurities.
A preparation method of a wrought magnesium alloy comprises the following steps:
taking pure magnesium, pure zinc, pure aluminum and magnesium-manganese intermediate alloy as raw materials, and calculating and batching according to the component content of the wrought magnesium alloy;
step two, putting the pure magnesium, magnesium and manganese intermediate alloy into a smelting furnace, and putting the pure magnesium, magnesium and manganese intermediate alloy into CO 2 And SF 6 Completely melting the mixture under the protection of the mixed gas to obtain a magnesium melt, adding preheated pure aluminum and pure zinc into the completely melted melt, preserving heat to completely melt the pure aluminum and the pure zinc, stirring and removing surface scum, and then preserving heat for 10-15 minutes at the temperature of 740 +/-10 ℃;
and step three, casting to obtain a magnesium alloy ingot.
Further, preheating a mould for casting in the third step at the temperature of 300 ℃, casting the melt into the mould, and cooling to obtain the magnesium alloy ingot.
Compared with the prior art, the invention has the following beneficial effects.
1. According to the invention, Zn element with specific content is added on the basis of Mg-Al-Mn series wrought magnesium alloy so as to improve the solid solubility of Mn element in the Mg-Al-Mn series wrought magnesium alloy. The addition of Zn does not change the phase composition in the Mg-Al-Mn series wrought magnesium alloy, so that the structural performance of the original wrought magnesium alloy is not influenced, and the addition of Zn with specific content can improve the solid solubility of Mn in the alloy, improve the content of Mn in the alloy, enable Mn and Al to generate more Al-Mn phases, improve the solid solution strengthening and second phase strengthening effects of Mn in the magnesium alloy, and further obtain the magnesium alloy with more excellent structural performance.
2. The raw material adopted by the invention is Zn with relatively low price, on one hand, Zn is easy to obtain in the market, is simple and easy to control in operation and is suitable for industrial mass production, and on the other hand, Zn is also a good alloying element in magnesium alloy and has very high solid solubility in Mg. Zn element is added into the magnesium alloy, and can also play a role in solid solution strengthening and second phase strengthening, thereby improving the strength; furthermore Zn can form Mg with the matrix 32 (Al,Zn) 49 A compound, thereby improving the creep resistance of the wrought magnesium alloy; in addition, Zn can improve the corrosion resistance to some extent by removing Fe element.
Detailed Description
The present invention will be described in further detail with reference to examples. The purities of the industrial pure magnesium, the pure aluminum and the pure zinc in the following examples are more than 99%; the magnesium-manganese master alloy is added in the form of Mg-3 Mn.
The first embodiment is a wrought magnesium alloy, which comprises the following components in percentage by weight: 3% of Al, 1% of Mn, 1% of Zn, and the balance of Mg and inevitable impurities.
The preparation method of the wrought magnesium alloy comprises the following steps:
firstly, preparing raw materials, namely taking pure magnesium, pure zinc, pure aluminum and magnesium-manganese intermediate alloy as raw materials, and calculating and batching according to the component content of the wrought magnesium alloy.
Step two, filling pure magnesium, magnesium and manganese intermediate alloy into a stainless steel crucible, and placing the stainless steel crucible in CO 2 And SF 6 Completely melting the mixture under the protection of mixed gas at 740 deg.C to obtain melt, wherein the CO is 2 And SF 6 Is 99: 1. after the pure magnesium and magnesium-manganese intermediate alloy is completely melted, adding the preheated pure aluminum and pure zinc into the completely melted melt, and preserving heat to completely melt the pure aluminum and the pure zinc. And a stainless steel colander is adopted for fully stirring to ensure that the components in the alloy are uniform, the segregation is avoided, and meanwhile, scum on the surface of the melt is knocked off. Then maintaining at 740 deg.CAnd (4) heating for 15 minutes to obtain a magnesium alloy melt.
And step three, casting the magnesium alloy melt obtained in the step two into a die preheated to 300 ℃, and cooling to obtain a magnesium alloy ingot.
The second embodiment is a wrought magnesium alloy, which comprises the following components in percentage by weight: 6% of Al, 1% of Mn, 1% of Zn, and the balance of Mg and inevitable impurities. The preparation method is the same as the first embodiment.
In a third embodiment, a wrought magnesium alloy comprises the following components in percentage by weight: 9% of Al, 1% of Mn, 1% of Zn, and the balance of Mg and inevitable impurities. The preparation method is the same as the first embodiment.
In order to better illustrate the effect of the Zn element of the invention, three groups of comparative examples are provided, which specifically comprise:
the first comparative example is a wrought magnesium alloy which comprises the following components in percentage by weight: 3% of Al, 1% of Mn, and the balance of Mg and inevitable impurities. The preparation method is the same as the first embodiment.
The second comparative example is a wrought magnesium alloy which comprises the following components in percentage by weight: 6% of Al, 1% of Mn, and the balance of Mg and inevitable impurities. The preparation method is the same as the first embodiment.
The third comparative example is a wrought magnesium alloy which comprises the following components in percentage by weight: 9% of Al, 1% of Mn, the balance Mg and unavoidable impurities. The preparation method is the same as the first embodiment.
Cutting magnesium alloy small blocks with the mass less than 0.2g from the centers of the ingots obtained in the first to third examples and the first to third comparative examples, grinding off surface oxide films, cleaning with alcohol, drying, and weighing the accurate mass m of the magnesium alloy small blocks by an electronic balance to obtain test samples. Then, the components of the magnesium alloy samples prepared in examples one to three and comparative examples one to three were measured by using an ICP inductively coupled plasma spectrometer, and the results are shown in table 1.
TABLE 1 test sample composition
| Examples | Mg(％) | Al(％) | Mn(％) | Zn(％) | m(g) |
| Comparative example 1 | Balance of | 3.1800 | 0.7066 | - | 0.0866 |
| Example one | Balance of | 2.8800 | 1.2275 | 0.9358 | 0.0641 |
| Comparative example No. two | Balance of | 4.7283 | 0.5612 | - | 0.1744 |
| Example two | Balance of | 4.5725 | 0.6789 | 0.8468 | 0.1905 |
| Comparative example No. three | Balance of | 8.4194 | 0.7248 | - | 0.0860 |
| EXAMPLE III | Balance of | 8.6690 | 0.6734 | 0.9588 | 0.0890 |
The result shows that the content of Mn in the Mg-Al-Mn series wrought magnesium alloy can be obviously improved by adding the Zn element, particularly the content of Mn in the Mg-3Al-1Mn alloy is improved from 0.7066 to 1.2275, and is increased by 73.7 percent. While the Mn content in the Mg-6Al-1Mn alloy is increased by 21.0 percent from 0.5612 to 0.6789, the increase of the Mn content is not as good as the former, probably because the increase of the Al content also has a certain influence on the Mn content, but the addition of Zn has a certain promotion effect on the increase of the Mn content. However, in the Mg-9Al-1Mn and Mg-9Al-1Mn-1Zn alloys, the Mn content is 0.7248 and 0.6734 respectively, and the Zn element is not greatly changed before and after the addition of the Mn element, so that when the Al content is within a certain range, namely the Al content is 1-6%, the addition of Zn in the Mg-Al-Mn alloys is beneficial to the improvement of the Mn content, which has important significance for improving the alloy performance and promoting the large-scale industrial production application of the alloy, and is beneficial to reducing the resource loss.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. The technical solution of the present invention is to be modified, replaced with equivalents or improved without departing from the spirit and principle of the technical solution of the present invention, and the technical solution of the present invention is to be covered by the claims of the present invention.
Claims (4)
1. The wrought magnesium alloy is characterized by comprising the following components in percentage by weight: 1-7% of Al, 0.6-2% of Mn, 0.5-1.5% of Zn, and the balance of Mg and inevitable impurities.
2. The wrought magnesium alloy of claim 1, comprising in weight percent: 3-6% of Al, 1% of Mn, 1% of Zn, and the balance of Mg and inevitable impurities.
3. The preparation method of the wrought magnesium alloy is characterized by comprising the following steps of:
firstly, pure magnesium, pure zinc, pure aluminum and magnesium-manganese intermediate alloy are used as raw materials, and ingredients are calculated and proportioned according to the component content of the wrought magnesium alloy of claim 1 or 2;
step two, putting the pure magnesium, magnesium and manganese intermediate alloy into a smelting furnace, and putting the pure magnesium, magnesium and manganese intermediate alloy into CO 2 And SF 6 Completely melting the aluminum alloy under the protection of the mixed gas to obtain a melt, adding preheated pure aluminum and pure zinc into the completely melted melt, preserving heat to completely melt the pure aluminum and the pure zinc, stirring and removing surface scum, and then preserving heat for 10-15 minutes at the temperature of 740 +/-10 ℃;
and step three, casting to obtain a magnesium alloy ingot.
4. The method for producing a wrought magnesium alloy according to claim 3, wherein: preheating a mould for casting in the third step at the temperature of 300 ℃, casting the melt into the mould, and cooling to obtain the magnesium alloy ingot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210701456.5A CN115029594A (en) | 2022-06-20 | 2022-06-20 | Wrought magnesium alloy and preparation method thereof |
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| CN202210701456.5A CN115029594A (en) | 2022-06-20 | 2022-06-20 | Wrought magnesium alloy and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005111251A1 (en) * | 2004-05-19 | 2005-11-24 | Institute Of Metal Research Chinese Academy Of Sciences | A high-strength, high-toughness cast magnesium alloy and the method thereof |
| CN101103131A (en) * | 2004-10-29 | 2008-01-09 | 独立行政法人产业技术综合研究所 | Housing made from magnesium alloy |
| KR101276665B1 (en) * | 2012-02-03 | 2013-06-19 | 한국기계연구원 | Magnesium alloy heat-treatable at high temperature |
| CN105238978A (en) * | 2015-09-28 | 2016-01-13 | 天津东义镁制品股份有限公司 | Preparation method of high-strength magnesium alloy profile |
| CN105603281A (en) * | 2016-04-01 | 2016-05-25 | 重庆大学 | Low-cost high-performance Mg-Al-Mn magnesium alloy |
-
2022
- 2022-06-20 CN CN202210701456.5A patent/CN115029594A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005111251A1 (en) * | 2004-05-19 | 2005-11-24 | Institute Of Metal Research Chinese Academy Of Sciences | A high-strength, high-toughness cast magnesium alloy and the method thereof |
| CN101103131A (en) * | 2004-10-29 | 2008-01-09 | 独立行政法人产业技术综合研究所 | Housing made from magnesium alloy |
| KR101276665B1 (en) * | 2012-02-03 | 2013-06-19 | 한국기계연구원 | Magnesium alloy heat-treatable at high temperature |
| CN105238978A (en) * | 2015-09-28 | 2016-01-13 | 天津东义镁制品股份有限公司 | Preparation method of high-strength magnesium alloy profile |
| CN105603281A (en) * | 2016-04-01 | 2016-05-25 | 重庆大学 | Low-cost high-performance Mg-Al-Mn magnesium alloy |
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