CN103103464A - Preparation method of magnesium alloy with high mechanical performance and tribological performance - Google Patents
Preparation method of magnesium alloy with high mechanical performance and tribological performance Download PDFInfo
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- CN103103464A CN103103464A CN201310017448XA CN201310017448A CN103103464A CN 103103464 A CN103103464 A CN 103103464A CN 201310017448X A CN201310017448X A CN 201310017448XA CN 201310017448 A CN201310017448 A CN 201310017448A CN 103103464 A CN103103464 A CN 103103464A
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Abstract
The invention discloses a preparation method of a magnesium alloy with high mechanical performance and tribological performance. The method comprises the following steps of: cutting an as-cast, as-rolled or as-forged magnesium alloy into a blank, wherein the section shape of the blank can be cut into a round or square shape according to actual need; performing surface machining treatment on the blank; coating the blank surface with a lubricating agent; performing equal-channel angular extrusion treatment by use of an equal-channel angular extrusion die consistent with the section shape of the blank; machining the blank surface after extrusion treatment each time; and after more than 4 times of equal-channel angular extrusion treatment, cleaning the blank surface, and performing surface laser fusing treatment so as to finally obtain a magnesium alloy block material of which the base body has high mechanical performance and the surface has high tribological performance, wherein the laser fusing treatment can change the working parameters of surface treatment according to actual need. The method disclosed by the invention can obviously improve the mechanical performance and tribological performance of the magnesium alloy, expands the application range of the alloy and meets the need for high-performance magnesium alloy in practical production.
Description
Technical field
The present invention relates to the magnesium alloy preparation method of a kind of strong mechanical performance and tribological property, the method that adopts Equal-channel Angular Pressing to combine with the laser melting technology prepares the high-performance magnesium-alloy alloy cube matherial, improve mechanical property and the tribological properties thereof such as plasticity, intensity, hardness of magnesium alloy, and then the practical engineering application that improves this alloy is worth.Belong to metal material moulding and processing technique field.
Background technology
Magnesium alloy is metal the lightest in structured material, have that density is little, specific tenacity is high, the advantage such as good rigidity, electromagnetic wave shielding are strong, pollution-free, can reclaim, this alloy also has good erosion resistance, thermal diffusivity, vibration damping, shock resistance, anti-electromagnetic interference, and good castability and dimensional stability, be described as the green engineering material of 21 century.Magnesium alloy is widely used in the fields such as Digital Video, photographic camera, mobile phone, notebook computer, electronic product.For economize on resources, protection of the environment, minimizing public hazards and make the product lightweight, magnesium alloy is widely used in industries such as automotive industry and aerospace in recent years.
, to the heavy demand of magnesium alloy the performance of magnesium alloy is had higher requirement along with the development of science and technology and various industry, but because also there is intensity in magnesium alloy itself and the problem such as wear resisting property is poor, restricting the further expansion of magnesium alloy range of application.The magnesium resource of China is abundant, is one of maximum former magnesium production and outlet in the world at present, still, in research and development magnesium alloy wrought magnesium alloys field particularly, still is in the starting stage.The preparation high-performance wrought magnesium alloy utilizes the resources advantage of China for the good performance of performance magnesium alloy, promotes Chinese society's Sustainable development and Resources for construction saving type and friendly environment society all to have very urgent and very important strategic importance.
The existing traditional plastic deformation method of the general employing of method who improves magnesium alloy mechanical property, though can improve to a certain extent the mechanical property of magnesium alloy by traditional plastic deformation method, this method also exists must weak point.Traditional complete processing such as rolling and conventional extrusion constantly reduces due to metallic substance cross-sectional area in the course of processing, therefore when proposing higher the requirement in engineering is used, these class methods just are difficult to meet the demands, and the sheet material tissue odds after rolling is even, anisotropy is serious, thin plate that produce below 1mm is more difficult, and the plastic deformation process deformation extents such as forging are limited, magnesium alloy mechanical property promotes less, and the traditional plastic deformation method can only improve the mechanical property of magnesium alloy by a small margin, and is less on improving the tribological property impact.
Summary of the invention
The present invention is intended to solve at least one of technical problem that exists in prior art.For this reason, the object of the invention is to propose a kind of magnesium alloy preparation method with high combination property for preparing, both can significantly improve the mechanical property of magnesium alloy, can significantly improve again the tribological property of magnesium alloy, solve the difficult problem that existing technologic mechanics performance and tribological property are difficult to take into account.
For realizing this purpose, in technical scheme of the present invention, the method that has adopted Equal-channel Angular Pressing to combine with the laser melting technology.At first as cast condition, the magnesium alloy that rolls attitude or forge attitude are carried out machining, cut into block blank, blank is carried out surface working to be processed, make blank surface smooth smooth, after blank surface coated graphite lubricant, adopt equal channel angular extrusion die to carry out Equal-channel Angular Pressing, after processing through 4 passage Equal-channel Angular Pressings, magnesium alloy after processing is carried out removing surface, carry out laser melting and process, finally obtain the well behaved magnesium alloy materials such as mechanical property, tribological property.
A kind of strong mechanical performance of the present invention is specially with the magnesium alloy preparation method of tribological property: adopt wire-electrode cutting and processing method to be processed into block blank identical with the equal channel angular extrusion die cross-sectional shape magnesium alloy blank, and blank surface is carried out grinding, make blank surface smooth smooth, have higher smooth finish.With acetone, blank is carried out surface cleaning, preheating is 10～20 minutes at the temperature of 70～120 ℃, then at the even coated graphite lubricant of blank surface, is placed at the temperature of 60～100 ℃ and dries 8～15 minutes.
It is 60～120 ° that the present invention adopts the squeezing passage angle of equal channel angular extrusion die.With acetone, mould is carried out surface and die cavity and clean, preheating is 30～50 minutes at the temperature of 150 ℃, coated graphite lubricant then, and coat-thickness is wanted evenly.The magnesium alloy blank that coats lubricant is put into equal channel angular extrusion die, and die assembly is good, on universal hydraulic testing machine, blank is pushed.The blank that squeezes out is carried out surface treatment again make it smooth smooth, and to mold cavity and blank coated graphite lubricant, then carry out the 2nd extruding, and repeat above process, carry out the 4 above Equal-channel Angular Pressings of passage.
Magnesium alloy blank after processing through Equal-channel Angular Pressing is carried out surfacing, with acetone, blank is carried out surface cleaning, dried at the temperature of 120 ℃ 10～20 minutes, carry out subsequently the laser melting surface treatment.In the laser melting treating processes, the processing parameter that the laser surface remeltings such as output rating, sweep velocity and defocusing amount are processed can be adjusted as required, the surface-treated layer of different depths can be obtained as required to have.
The preparation method that the present invention adopts Equal-channel Angular Pressing to combine with laser melting first carries out Equal-channel Angular Pressing to magnesium alloy and processes, then carries out laser melting and process, and this method has significantly improved mechanical property and the tribological property of magnesium alloy.Roll attitude or to forge the attitude magnesium alloy if adopt, so the class magnesium alloy carries out viscous deformation and processed, and waited the passage extrusion passes suitably to reduce; If the employing as-cast magnesium alloy, the Equal-channel Angular Pressing number of times can suitably increase.
After Equal-channel Angular Pressing is processed, the mechanical property such as magnesium alloy strength, hardness is compared with the magnesium alloy mechanical property that conventional plastic deformation process is processed and is significantly improved, can further improve the mechanical property of magnesium alloy, prepare the magnesium alloy substrate material with higher force performance; After processing through laser melting, the tribological property of Mg alloy surface significantly improves, and finally obtains the high magnesium alloy materials of over-all properties, can give full play to the advantage of magnesium alloy, enlarges the range of application of magnesium alloy.Sample is size constancy before and after extruding, processes simply, and lumber recovery is high, and can realize large workpiece processing.Before extruding, mold cavity and blank to be extruded are lubricated respectively processing, can reduce significantly the sliding-frictional resistance between blank and mold work surface, thereby effectively improve the flow uniformity of alloy material, the carrying out smoothly of assurance extrusion process; The swabbing processing method is simple, and salty is low, and after actually operating, blank and mould self falling are not bonded together mutually, good manufacturability, and have higher working efficiency.
Embodiment
Below by specific embodiment, technical scheme of the present invention is further described.
Embodiment 1:
Adopting wire-electrode cutting and processing method to be processed into sectional area the trade mark as-cast magnesium alloy blank that is ZM1 is 20 * 20mm, and length is the block blank of 300mm, and blank is carried out surface treatment, makes smooth surface smooth.With acetone, blank surface is carried out surface cleaning, blank is placed on clean stainless steel pallet, preheating is 15 minutes at the temperature of 120 ℃, then adopt the method for brushing at the even coated graphite lubricant of blank surface, after coating, blank was dried 10 minutes at the temperature of 100 ℃, if occur falling to being coated with, cut, the defective such as peel off, carry out coating or wash away recoat.Be that 90 degree moulds carry out the surface and die cavity cleans with acetone to the extruding angle, preheating is 40 minutes at the temperature of 150 ℃, then even coated graphite lubricant.The magnesium alloy that coats oildag is placed in mould, good die assembly, push on universal hydraulic testing machine, the blank that squeezes out is carried out carrying out the 2-5 time extruding after surface treatment again.
Magnesium alloy ZM1 after Equal-channel Angular Pressing is processed carries out surface treatment, make smooth surface smooth, with acetone, blank is carried out surface cleaning, dried at the temperature of 120 ℃ 10～20 minutes, carrying out laser melting after oven dry processes, the processing parameter of selecting the suitable laser surface remeltings such as output rating, sweep velocity and defocusing amount to process, having obtained the degree of depth is the surface-treated layer of 0.3mm.
Embodiment 2:
The attitude magnesium alloy blank that rolls that is AZ41M with the trade mark adopts wire-electrode cutting and processing method to be processed into cross-sectional shape for circular, and section radius is 10mm, and length is the cylinder blank of 300mm, and blank is carried out surface treatment, makes smooth surface smooth.With acetone, blank surface is carried out surface cleaning, blank is placed on clean stainless steel pallet, preheating is 15 minutes at the temperature of 120 ℃, then adopt the method for brushing at the even coated graphite lubricant of blank surface, after coating, blank was dried 10 minutes at the temperature of 100 ℃, if occur falling to being coated with, cut, the defective such as peel off, carry out coating or wash away recoat.Be that 90 degree moulds carry out the surface and die cavity cleans with acetone to the extruding angle, preheating is 40 minutes at the temperature of 150 ℃, then even coated graphite lubricant.The magnesium alloy that coats oildag is placed in mould, good die assembly, push on universal hydraulic testing machine, the blank that squeezes out is carried out carrying out the 2-5 time extruding after surface treatment again.
Magnesium alloy after Equal-channel Angular Pressing is processed carries out surface treatment, make smooth surface smooth, with acetone, blank is carried out surface cleaning, dried at the temperature of 120 ℃ 10～20 minutes, carrying out laser melting after oven dry processes, the processing parameter of selecting the suitable laser surface remeltings such as output rating, sweep velocity and defocusing amount to process, having obtained the degree of depth is the surface-treated layer of 0.4mm.
Embodiment 3:
The forging attitude magnesium alloy blank that is AZ40M with the trade mark adopts wire-electrode cutting and processing method to be processed into cross-sectional shape for circular, and section radius is 15mm, and length is the cylinder blank of 200mm, and blank is carried out surface treatment, makes smooth surface smooth.With acetone, blank surface is carried out surface cleaning, blank is placed on clean stainless steel pallet, preheating is 15 minutes at the temperature of 120 ℃, then adopt the method for brushing at the even coated graphite lubricant of blank surface, after coating, blank was dried 10 minutes at the temperature of 100 ℃, if occur falling to being coated with, cut, the defective such as peel off, carry out coating or wash away recoat.Be that 90 degree moulds carry out the surface and die cavity cleans with acetone to the extruding angle, preheating is 40 minutes at the temperature of 150 ℃, then even coated graphite lubricant.The magnesium alloy that coats oildag is placed in mould, good die assembly, push on universal hydraulic testing machine, the blank that squeezes out is carried out carrying out the 2-5 time extruding after surface treatment again.
Magnesium alloy after Equal-channel Angular Pressing is processed carries out surface treatment, make smooth surface smooth, with acetone, blank is carried out surface cleaning, dried at the temperature of 120 ℃ 10～20 minutes, carrying out laser melting after oven dry processes, the processing parameter of selecting the suitable laser surface remeltings such as output rating, sweep velocity and defocusing amount to process, having obtained the degree of depth is the surface-treated layer of 0.5mm.
Claims (5)
1. a strong mechanical performance and tribological property magnesium alloy preparation method, it is characterized in that: the method that adopts Equal-channel Angular Pressing to combine with laser melting, first magnesium alloy being carried out the multi-pass Equal-channel Angular Pressing processes, acquisition has the magnesium alloy substrate material of strong mechanical performance, afterwards the magnesium alloy after extrusion process is carried out the laser melting surface treatment, the final matrix that obtains has strong mechanical performance, and the surface has the magnesium alloy bulk of high tribological property.
2. strong mechanical performance according to claim 1 and tribological property magnesium alloy preparation method is characterized in that: the magnesium alloy that is used for Equal-channel Angular Pressing can be for as cast condition, roll attitude or forge any form of attitude.
3. strong mechanical performance according to claim 1 and tribological property magnesium alloy preparation method, it is characterized in that: before Equal-channel Angular Pressing is processed, magnesium alloy need cut into block blank, the cross-sectional shape of blank can cut into circular or square according to actual needs, and blank carries out need carrying out mechanical process before each Equal-channel Angular Pressing is processed.
4. strong mechanical performance according to claim 1 and tribological property magnesium alloy preparation method is characterized in that: when each Equal-channel Angular Pressing is processed, blank surface need apply lubricant, to reduce the wearing and tearing of blank and equal channel angular extrusion die.
5. strong mechanical performance according to claim 1 and tribological property magnesium alloy preparation method, it is characterized in that: after processing through Equal-channel Angular Pressing more than 4 times, magnesium alloy is carried out the laser melting surface treatment, capable of regulating laser technical parameters during processing is to obtain the surface-treated layer of different depths.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114561606A (en) * | 2022-01-25 | 2022-05-31 | 中北大学 | Preparation method of magnesium alloy wire for electric arc additive |
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Application publication date: 20130515 |