CN103074530B - Preparation method of high-strength heat-resistant magnesium alloy - Google Patents
Preparation method of high-strength heat-resistant magnesium alloy Download PDFInfo
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Abstract
A preparation method of a high-strength heat-resistant magnesium alloy. The method is characterized by comprising the following steps: adding a Mg-Sm intermediate alloy into a 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 660 DEG C-680 DEG C; casting into ingots; conducting homogenization treatment on the ingots; preheating; and extruding. 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, uniformly distributed Al2Sm with small particle size, and improved high temperature performance; besides, the process is simple, safe, reliable, convenient for operation, and free of three wastes.
Description
Technical field
The present invention relates to a kind of preparation method of high-strength heat-resistant magnesium alloy.
Background technology
Magnesium alloy is current 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, there are extremely important using value and wide application prospect, are described as " 21 century green engineering material ".Due to shortcomings such as the resistance toheat of magnesium alloy are poor, creep strength is low, also limited to a certain extent the further application of magnesium alloy.When use temperature or envrionment temperature raise, intensity and the creep-resistant property of magnesium alloy significantly decline, and make it be difficult to be applied even more extensively in the industry such as, automobile large in aviation, boat as vital part (as the component in engine) material.Therefore, the research and development of heat-resistant deforming magnesium alloy have become one of important directions in world's Magnesium Industry.Most of magnesium alloy have close-packed hexagonal structure, so think that magnesium alloy is a kind of viscous deformation, poor metallic substance of press working forming property of being difficult to.And most of magnesium alloy have again good castability, current magnesium-alloy material is mostly shaped to cast particularly pressure casting method, the magnesium-alloy material of plastic molding method processing is seldom.Yet the mechanical property of foundry goods is not but very desirable, shape of product size has some limitations, and easily produces tissue defects, causes the use properties of magnesium alloy and range of application to be limited by very large.According to international magnesium association, analyze, the magnesium-alloy material of producing through plastic making has higher intensity, better ductility and more diversified mechanical property than cast magnesium alloys product.Therefore,, as the magnesium alloy of structured material, exploitation wrought magnesium alloys product is the trend of its following long term growth.
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 magnesium alloy resistance toheat by adding rare earth, alkaline earth, Si and other elements.Rare earth is generally considered and improves magnesium alloy resistance toheat the most directly and the most effective alloying element, 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
2sm intermetallic compound can effectively improve room temperature and the high-temperature behavior of magnesium alloy, but rare earth element Sm content reaches after 1-2wt%, Al
2the quantity of Sm phase increases gradually, size is constantly grown up and be tending towards segregation, and the Properties of High Temperature Creep of magnesium alloy is declined.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 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 refinement enhanced granule; improve enhanced granule uniformly dispersed in melt, to reach the object of improving alloy property.
Ultrasonic original position is in the application containing in the heat resistance magnesium alloy of Sm, and the effective generated in-situ strengthening phase of refinement of energy also promotes it dispersed, is expected to further improve the Properties of High Temperature Creep of magnesium alloy.
Summary of the invention
The preparation method who the object of this invention is to provide a kind of high-strength heat-resistant magnesium alloy, its feature preparation method is: the ultrasonic in-situ synthesis of a kind of use is prepared the method for Heat Resistant Rare Earth-magnesium Alloy, its feature preparation method is: when 720 ℃～780 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass, again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 600～1200W at ultrasonic power, ultrasonic 10～15min, melt temperature is down to 660 ℃～680 ℃, is cast into ingot casting.Above-mentioned ingot casting is carried out to homogenizing processing, then push after preheating.
The present invention is achieved like this, a kind of preparation method of high-strength heat-resistant magnesium alloy, its feature preparation method is: when 720 ℃～780 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass, again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 600～1200W at ultrasonic power, ultrasonic 10～15min, melt temperature is down to 660 ℃～680 ℃, is cast into ingot casting.Above-mentioned ingot casting is carried out to homogenizing processing, then push after preheating.
Magnesium alloy composition is (massfraction): Al:2.8-3.8%, Zn:0.6-1.4%, and Mn:0.4-0.8%, its rare earth elements Sm accounts for claim 1 prepared Heat Resistant Rare Earth-magnesium Alloy gross weight: 1.0-3.0%.
Technique effect of the present invention is: in the Heat Resistant Rare Earth-magnesium Alloy tissue that employing the present invention obtains, crystal grain is tiny, the Al of generation
2sm particle size is tiny and be evenly distributed, and the high-temperature behavior of alloy significantly improves, and technique is simple, safe and reliable, easy to operate, and three-waste free pollution.
Embodiment
A kind of preparation method of high-strength heat-resistant magnesium alloy
Embodiment 1: when 720 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 1.0%), again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 600W at ultrasonic power, ultrasonic 10min, melt temperature is down to 660 ℃, is cast into ingot casting.Above-mentioned ingot casting is carried out to homogenizing processing, and treatment temp is 400 ℃, soaking time 8 h; After preheating, push, preheating temperature is 380 ℃ again, and be 1h warm up time; Extrusion temperature is 400 ℃, extrusion ratio 6.25, and extrusion speed is 10mm/s.Magnesium alloy tensile strength prepared by aforesaid method is 208MPa.
Embodiment 2: when 780 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 2.0%), again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 800W at ultrasonic power, ultrasonic 15min, melt temperature is down to 680 ℃, is cast into ingot casting.Above-mentioned ingot casting is carried out to homogenizing processing, and treatment temp is 380 ℃, soaking time 8 h; After preheating, push, preheating temperature is 400 ℃ again, and be 2h warm up time; Extrusion temperature is 420 ℃, extrusion ratio 45, and extrusion speed is 15mm/s.Magnesium alloy tensile strength prepared by aforesaid method is 215MPa.
Embodiment 3: when 760 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass (wherein Sm account for final Heat Resistant Rare Earth-magnesium Alloy gross weight 3.0%), again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 800W at ultrasonic power, ultrasonic 10min, melt temperature is down to 660 ℃, is cast into ingot casting.Above-mentioned ingot casting is carried out to homogenizing processing, and treatment temp is 400 ℃, soaking time 10 h; After preheating, push, preheating temperature is 400 ℃ again, and be 1h warm up time; Extrusion temperature is 420 ℃, extrusion ratio 6.25, and extrusion speed is 20mm/s.Magnesium alloy tensile strength prepared by aforesaid method is 195MPa.
Claims (1)
1. the preparation method of a high-strength heat-resistant magnesium alloy, its feature preparation method is: when 720 ℃～780 ℃ of temperature, Mg-Sm master alloy is joined in magnesium alloy fused mass, again ultrasonic amplitude transformer is stretched in magnesium alloy fused mass, under the condition that is 600～1200W at ultrasonic power, ultrasonic 10～15min, melt temperature is down to 660 ℃～680 ℃, be cast into ingot casting, prepared Heat Resistant Rare Earth-magnesium Alloy composition is Al:2.8-3.8%, Zn:0.6-1.4%, Mn:0.4-0.8%, Sm:1.0 or 3.0%, above-mentioned ingot casting is carried out to homogenizing processing, treatment temp is 400 ℃, soaking time 10 h, after preheating, push, preheating temperature is 400 ℃ again, and be 1h warm up time, extrusion temperature is 420 ℃, extrusion ratio 6.25, and extrusion speed is 20mm/s.
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| CN104084567B (en) * | 2014-06-30 | 2016-10-05 | 华南理工大学 | Metal bath processing method based on power ultrasonic Yu coupling pressure |
| CN104498794A (en) * | 2014-12-15 | 2015-04-08 | 镁联科技（芜湖）有限公司 | High-temperature-resistant magnesium alloy, and preparation method and application thereof |
| CN106917021B (en) * | 2017-03-02 | 2018-10-16 | 东北大学 | High-plastic heat-resisting AZ systems high-alumina magnesium alloy squeeze wood of one kind and preparation method thereof |
| CN107177762A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy profiles |
| CN107283085A (en) * | 2017-06-23 | 2017-10-24 | 洛阳理工学院 | A kind of magnesium alloy brazing filler metal containing Sm and preparation method thereof, application |
| WO2022012024A1 (en) * | 2020-07-17 | 2022-01-20 | 东莞宜安科技股份有限公司 | Magnesium alloy material-based high vacuum precision die casting technique for new energy vehicles |
| CN115044845B (en) * | 2022-06-09 | 2023-05-05 | 中南大学 | Method for improving comprehensive performance of biodegradable Mg-Zn-Sc-Zr alloy |
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