CN103074528A - Ultrasonic in-situ synthesis method for preparing rare earth heat-resistant magnesium alloy - Google Patents
Ultrasonic in-situ synthesis method for preparing rare earth heat-resistant magnesium alloy Download PDFInfo
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- CN103074528A CN103074528A CN201210346060XA CN201210346060A CN103074528A CN 103074528 A CN103074528 A CN 103074528A CN 201210346060X A CN201210346060X A CN 201210346060XA CN 201210346060 A CN201210346060 A CN 201210346060A CN 103074528 A CN103074528 A CN 103074528A
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Abstract
An ultrasonic in-situ synthesis method for preparing a rare earth heat-resistant magnesium alloy. The preparation method is characterized by comprising the following steps: heating a magnesium alloy ingot in a crucible to a melt state; adding a Mg-Sm intermediate alloy into the magnesium alloy melt at a temperature of 720 DEG C-780 DEG C; then stretching an ultrasonic amplitude-change pole into the magnesium alloy melt; subjecting the magnesium alloy melt to ultrasonic treatment with power of 600-1200W for 10-15min; cooling the melt to 670 DEG C-680 DEG C; and continuously subjecting the magnesium alloy melt to ultrasound treatment for 8-10min. The invention has the following technical effects: the rare earth heat-resistant magnesium alloy prepared by the method provided by the invention has small grains in tissues, and uniformly distributed Al2Sm particles with small particle size; besides, the process is simple, safe, reliable, convenient for operation and free of three wastes.
Description
Technical field
The present invention relates to the method that the ultrasonic in-situ synthesis of a kind of usefulness prepares Heat Resistant Rare Earth-magnesium Alloy
Background technology
Magnesium alloy is present the lightest applicable structural metallic materials, have that density is low, specific tenacity and the advantage such as specific rigidity is high, damping vibration attenuation excellent performance, thermal conductivity are good, easy recovery, in fields such as aerospace, automobile making, household electrical appliances instrument, telecommunications, biomedicines extremely important using value and wide application prospect are arranged, be described as " 21 century green engineering material ".Because the shortcomings such as the resistance toheat of magnesium alloy is poor, creep strength is low have also limited the further application of magnesium alloy to a certain extent.When use temperature or envrionment temperature raise, intensity and the creep-resistant property of magnesium alloy significantly descended, and made it be difficult to be applied even more extensively in the industry such as, automobile large in aviation, boat as vital part (such as the component in the engine) material.Therefore, the research and development of heat-resistant deforming magnesium alloy have become one of important directions in world's Magnesium Industry.
The research of heat resistance magnesium alloy starts from mid-term in 20th century in the world, development through many decades, the design theory of heat resistance magnesium alloy is perfect gradually, has formed to carry out alloying and form the design philosophy that the high strengthening phase of thermostability improves the magnesium alloy resistance toheat by adding rare earth, alkaline earth, Si and other elements.Rare earth is generally considered and improves the direct and the most effective alloying element of magnesium alloy resistance toheat, wherein, the atomic size of Sm and magnesium approaches, solid solubility in magnesium (being 5.8% to the maximum) is larger than La, Ce, Pr, Nd, can realize the strengthening effects such as solution strengthening, thereby improve the resistance toheat of magnesium alloy.Thereby the remarkable effect of rare earth element Sm in heat resistance magnesium alloy caused numerous investigators' attention gradually.
Research is found: Al
2But room temperature and the high-temperature behavior of Sm intermetallic compound Effective Raise magnesium alloy, but after rare earth element Sm content reaches 1-2wt%, Al
2The quantity of Sm phase increases gradually, size is constantly grown up and be tending towards segregation, so that the Properties of High Temperature Creep of magnesium alloy descends.Ultrasonic in-situ synthesis is the novel method that a kind of latest developments get up to prepare high performance material; its principle is to utilize chemical reaction occurs between different elements or the chemicals under certain condition; and in metallic matrix, generate one or more ceramic phases or particle or intermetallic compound; and under the sound cavitation effect and acoustic streaming effect effect of high-energy ultrasonic; significantly improve pattern and size with the refinement enhanced granule; improve enhanced granule uniformly dispersed in melt, to reach the purpose of improving alloy property.
The application of ultrasonic original position in containing the heat resistance magnesium alloy of Sm, the effective generated in-situ strengthening phase of refinement of energy also promotes its Uniform Dispersion, is expected to further improve the Properties of High Temperature Creep of magnesium alloy.
Summary of the invention
The purpose of this invention is to provide the method that the ultrasonic in-situ synthesis of a kind of usefulness prepares Heat Resistant Rare Earth-magnesium Alloy, its feature preparation method is: magnesium alloy ingot is put into crucible be heated to fusing, when 750 ℃～780 ℃ of temperature, the Mg-Sm master alloy is joined in the melt, again ultrasonic amplitude transformer is stretched in the magnesium alloy fused mass, be under the condition of 800～1200W at ultrasonic power, ultrasonic 10～15min; Melt temperature is down to 670 ℃～680 ℃, continues ultrasonic 8～10min, the casting sampling.
The present invention is achieved like this, and magnesium alloy ingot is put into crucible be heated to fusing, when 750 ℃～780 ℃ of temperature, the Mg-Sm master alloy is joined in the melt, ultrasonic amplitude transformer being stretched in the magnesium alloy fused mass, is under the condition of 800～1200W at ultrasonic power again, ultrasonic 10～15min; Melt temperature is down to 670 ℃～680 ℃, continues ultrasonic 8～10min, the casting sampling.Wherein the magnesium alloy composition is (massfraction): Al:5.9-10.2%, and Mn:0.4-0.8%, rare earth element Sm account for claim 1 prepared Heat Resistant Rare Earth-magnesium Alloy gross weight: 2.0-5.0%.
Technique effect of the present invention is: crystal grain is tiny in the Heat Resistant Rare Earth-magnesium Alloy tissue that employing the present invention obtains, the Al of generation
2The Sm particle size is tiny and be evenly distributed, and technique is simple, safe and reliable, easy to operate, and three-waste free pollution.
Description of drawings
Fig. 1 is the heat resistance magnesium alloy microstructure that the present invention prepares.
Fig. 2 is Al in the heat resistance magnesium alloy for preparing of the present invention
2The distribution situation of Sm.
Embodiment
Ultrasonic in-situ synthesis prepares Heat Resistant Rare Earth-magnesium Alloy:
Embodiment 1: magnesium alloy ingot is put into crucible be heated to fusing, when temperature is 750 ℃, the Mg-15%Sm(massfraction that will coat with aluminium-foil paper) master alloy join in the melt (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 3%), again ultrasonic amplitude transformer is stretched in the magnesium alloy fused mass, be under the condition of 1000W at ultrasonic power, ultrasonic 10min; Melt temperature is down to 680 ℃, continues ultrasonic 8min, the casting sampling.
Embodiment 2: magnesium alloy ingot is put into crucible be heated to fusing, when temperature is 780 ℃, the Mg-40%Sm(massfraction that will coat with aluminium-foil paper) master alloy join in the melt (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 2%), again ultrasonic amplitude transformer is stretched in the magnesium alloy fused mass, be under the condition of 800W at ultrasonic power, ultrasonic 15min; Melt temperature is down to 670 ℃, continues ultrasonic 10min, the casting sampling.
Embodiment 3: magnesium alloy ingot is put into crucible be heated to fusing, when temperature is 780 ℃, with the Mg-20%Sm(massfraction) master alloy join in the melt (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 5%), again ultrasonic amplitude transformer is stretched in the magnesium alloy fused mass, be under the condition of 900W at ultrasonic power, ultrasonic 12min; Melt temperature is down to 680 ℃, continues ultrasonic 8min, the casting sampling.
As shown in Figure 1, there is not obvious dendritic crystal state Mg to occur in the heat resistance magnesium alloy tissue that under embodiment 2 conditions, obtains
17Al
12Obtained mutually significant refinement.
As shown in Figure 2, under high-energy ultrasonic, reaction has generated a large amount of tiny and equally distributed Al
2The Sm particle.The white punctate substance that generates as we can see from the figure mainly is distributed in crystals, and granular size is about 2-5
M.
Technique effect of the present invention is: crystal grain is tiny in the Heat Resistant Rare Earth-magnesium Alloy tissue that employing the present invention obtains, the Al of generation
2The Sm particle size is tiny and be evenly distributed, and technique is simple, safe and reliable, easy to operate, and three-waste free pollution.
Claims (2)
1. method for preparing Heat Resistant Rare Earth-magnesium Alloy with ultrasonic in-situ synthesis, it is characterized in that the preparation method is: magnesium alloy ingot is put into crucible be heated to fusing, when 750 ℃～780 ℃ of temperature, the Mg-Sm master alloy is joined in the melt, again ultrasonic amplitude transformer is stretched in the magnesium alloy fused mass, be under the condition of 800～1200W at ultrasonic power, ultrasonic 10～15min; Melt temperature is down to 670 ℃～680 ℃, continues ultrasonic 8～10min, the casting sampling.
2. the ultrasonic in-situ synthesis of a kind of usefulness according to claim 1 prepares the method for Heat Resistant Rare Earth-magnesium Alloy, it is characterized in that magnesium alloy massfraction composition is: Al:5.9-10.2%, Mn:0.4-0.8%, its rare earth elements Sm account for the prepared Heat Resistant Rare Earth-magnesium Alloy gross weight of claim 1: 2.0-5.0%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924140A (en) * | 2014-03-26 | 2014-07-16 | 南昌大学 | Preparation method of aluminum oxide reinforced magnesium-based nanocomposite |
| CN104313370A (en) * | 2014-09-24 | 2015-01-28 | 华中科技大学 | Method for refinement of rare earth-rich phase of rare earth-magnesium alloy |
| CN107838387A (en) * | 2017-11-28 | 2018-03-27 | 上海航天精密机械研究所 | The method that ultrasonic assistant prepares ZM5 Mg alloy castings |
| CN109112376A (en) * | 2018-09-25 | 2019-01-01 | 南昌大学 | A kind of preparation method of Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy |
| CN109385545A (en) * | 2018-09-25 | 2019-02-26 | 南昌大学 | A kind of preparation method of ultrasound Mg-Al-Zn-Mn-Nd corrosion resistant rare earth magnesium alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618757A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resistant magnesium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102618757A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resistant magnesium alloy |
Non-Patent Citations (3)
| Title |
|---|
| 吴庆捷 等: "《超声作用下原位反应制备MgZSi/AM60复合材料的显微组织》", 《机械工程材料》 * |
| 徐河: "《镁合金制备与加工技术》", 31 May 2007, 冶金工业出版社 * |
| 黄正华等: "《Mg-Al-Zn-Sm 耐热镁合金的组织与力学性能》", 《热加工工艺》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924140A (en) * | 2014-03-26 | 2014-07-16 | 南昌大学 | Preparation method of aluminum oxide reinforced magnesium-based nanocomposite |
| CN104313370A (en) * | 2014-09-24 | 2015-01-28 | 华中科技大学 | Method for refinement of rare earth-rich phase of rare earth-magnesium alloy |
| CN104313370B (en) * | 2014-09-24 | 2016-08-24 | 华中科技大学 | A kind of refine the method for Nd-rich phase in magnesium-rare earth |
| CN107838387A (en) * | 2017-11-28 | 2018-03-27 | 上海航天精密机械研究所 | The method that ultrasonic assistant prepares ZM5 Mg alloy castings |
| CN109112376A (en) * | 2018-09-25 | 2019-01-01 | 南昌大学 | A kind of preparation method of Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy |
| CN109385545A (en) * | 2018-09-25 | 2019-02-26 | 南昌大学 | A kind of preparation method of ultrasound Mg-Al-Zn-Mn-Nd corrosion resistant rare earth magnesium alloy |
| CN109385545B (en) * | 2018-09-25 | 2020-07-14 | 南昌大学 | Preparation method of ultrasonic Mg-Al-Zn-Mn-Nd corrosion-resistant rare earth magnesium alloy |
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