CN101058877A - Method of preparing thin crystal layer on magnesium alloy surface - Google Patents
Method of preparing thin crystal layer on magnesium alloy surface Download PDFInfo
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- CN101058877A CN101058877A CN 200710017521 CN200710017521A CN101058877A CN 101058877 A CN101058877 A CN 101058877A CN 200710017521 CN200710017521 CN 200710017521 CN 200710017521 A CN200710017521 A CN 200710017521A CN 101058877 A CN101058877 A CN 101058877A
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Abstract
The invention discloses a preparing method of fine-grained layer on the surface of magnesium alloy, which is characterized by the following: adopting casting shaping magnesium alloy as raw material; sanding the surface of magnesium alloy; stirring the surface; forming the fine-grained layer with high antirusting and anti-abrasion resistance.
Description
Technical field
The invention belongs to the process for modifying surface field, relate to the raising of surface detail crystallization and corrosion resistance of surface.
Background technology
Patent of invention " magnesium alloy surface SiC+Al pile up welding method " (application number 200410089271.5) discloses a kind of magnesium alloy surface SiC+Al pile up welding method, with the magnesium alloy work-piece surface sand papering, removes oxide compound, again with the alcohol flushing, at air drying; SiC and Al powder are mixed back adding binding agent by granularity and volume ratio SiC/Al, stir, make coating material; The coating material for preparing is coated in magnesium alloy work-piece surface equably, will has the magnesium alloy workpiece oven dry of coating then; Magnesium alloy work-piece surface with coating is carried out protection of inert gas tungsten electrode arc built-up welding remelting handle, regulate welding current, welding speed and welding gun angle are selected shielding gas and protection airshed, select the tungsten electrode diameter for use.The weak point of this technology is that energy consumption is bigger, and the technology more complicated makes Mg alloy surface produce oxidation easily.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of thin crystal layer on magnesium alloy surface, the solidity to corrosion and the wear resistance of raising Mg alloy surface.
The present invention is a kind of method for preparing thin crystal layer on magnesium alloy surface, adopts the magnesium alloy of cast form, at first Mg alloy surface is polished, and Mg alloy surface is carried out agitating friction processing, forms fine grained texture at Mg alloy surface.
Usefulness of the present invention is: 1: multiple technique effect is arranged, process significantly crystal grain thinning by agitating friction, the homogenizing alloy structure is eliminated the as-cast structure defective.Grain refining to magnesium alloy strength and plasticity to improve effect fairly obvious, crystal grain thinning can promote crystal boundary cooperative slip deformability, improves the mechanical property and the plastic deformation ability of magnesium alloy.Moreover phase composite and Microstructure characteristics are the important factors that influences corrosion stability of magnesium alloy, and crystal grain is tiny, microtexture is even and do not have the magnesium alloy of composition segregation, help to form protective oxide film and eliminate the microbattery effect at Mg alloy surface.Obviously improve the corrosion resistance of magnesium alloy.2: technology is simple, and is easy to operate, need not specific equipment, uses friction stir welding machine and get final product.And the shape size of workpiece is unrestricted, so long as a plane just can process.Be not subjected to the restriction of processing environment, need not consider the problems such as oxidation of magnesium alloy.
Description of drawings
The Mg alloy surface Electronic Speculum microstructure that the AZ91D magnesium alloy that Fig. 1 obtains for permanent mold casting does not adopt the present invention to handle, the Mg alloy surface Electronic Speculum microstructure that the AZ91D magnesium alloy that Fig. 2 obtains for permanent mold casting adopts the present invention to handle.
Embodiment
With the AZ91D magnesium alloy that permanent mold casting obtains, at first Mg alloy surface is polished, on the friction stir welding machine that directly is installed Mg alloy surface to be processed, the rotating speed of friction stir welding machine is 250～500 commentaries on classics/per minutes, weldering speed is 160～450mm/ per second.Obtain the fine grained texture that one deck crystal grain is tiny, organize homogeneous densification, no casting flaw.Be illustrated in figure 1 as Mg alloy surface Electronic Speculum microstructure before the agitating friction processing, organize extremely inhomogeneous, eutectic Mg
17Al
12Be discontinuous netted or thin rod shape distribution, crystal grain is extremely thick.As shown in Figure 2, after agitating friction processing, eutectic Mg
17Al
12It is very tiny that completely dissolve, crystal grain also become.
Claims (2)
1, a kind of method for preparing thin crystal layer on magnesium alloy surface, the magnesium alloy of employing cast form is at first polished to Mg alloy surface, it is characterized in that Mg alloy surface is carried out agitating friction processing, forms fine grained texture at Mg alloy surface.
2, a kind of method for preparing thin crystal layer on magnesium alloy surface according to claim 1, the AZ91D magnesium alloy that adopts permanent mold casting to obtain, at first Mg alloy surface is polished, the specification that it is characterized in that the agitating friction head selected for use is: shaft shoulder diameter 18mm, mixing needle diameter 6mm, high 4mm, be contained on the friction stir welding machine Mg alloy surface is processed, the rotating speed of friction stir welding machine is 200～500 commentaries on classics/per minutes, and weldering speed is 150～450mm/ per second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017521 CN101058877A (en) | 2007-03-12 | 2007-03-12 | Method of preparing thin crystal layer on magnesium alloy surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017521 CN101058877A (en) | 2007-03-12 | 2007-03-12 | Method of preparing thin crystal layer on magnesium alloy surface |
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| Publication Number | Publication Date |
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| CN101058877A true CN101058877A (en) | 2007-10-24 |
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| CN 200710017521 Pending CN101058877A (en) | 2007-03-12 | 2007-03-12 | Method of preparing thin crystal layer on magnesium alloy surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489870A (en) * | 2011-12-13 | 2012-06-13 | 重庆大学 | Method for preparing thixomolding plate blank |
| CN105209212A (en) * | 2013-03-12 | 2015-12-30 | 洛克希德马丁公司 | Friction surface stir process |
| CN105463353A (en) * | 2015-11-23 | 2016-04-06 | 哈尔滨工业大学 | Method for manufacturing fine-grain magnesium alloy block through friction stir treatment |
| CN107858617A (en) * | 2017-11-06 | 2018-03-30 | 重庆理工大学 | The method that low-rotate speed mixing yoghurt was modified and prepared wear-resistant titanium surface to titanium surface |
| CN109161758A (en) * | 2018-09-14 | 2019-01-08 | 合肥工业大学 | A kind of high-strength high-plasticity magnesium alloy composite board and preparation method |
| CN110977141A (en) * | 2019-12-16 | 2020-04-10 | 南京工程学院 | Method for preparing nanocrystalline nickel-titanium shape memory alloy |
-
2007
- 2007-03-12 CN CN 200710017521 patent/CN101058877A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489870A (en) * | 2011-12-13 | 2012-06-13 | 重庆大学 | Method for preparing thixomolding plate blank |
| CN105209212A (en) * | 2013-03-12 | 2015-12-30 | 洛克希德马丁公司 | Friction surface stir process |
| CN105463353A (en) * | 2015-11-23 | 2016-04-06 | 哈尔滨工业大学 | Method for manufacturing fine-grain magnesium alloy block through friction stir treatment |
| CN105463353B (en) * | 2015-11-23 | 2017-07-28 | 哈尔滨工业大学 | A kind of method that stirring friction treatment prepares fine grain magnesium alloy block |
| CN107858617A (en) * | 2017-11-06 | 2018-03-30 | 重庆理工大学 | The method that low-rotate speed mixing yoghurt was modified and prepared wear-resistant titanium surface to titanium surface |
| CN109161758A (en) * | 2018-09-14 | 2019-01-08 | 合肥工业大学 | A kind of high-strength high-plasticity magnesium alloy composite board and preparation method |
| CN110977141A (en) * | 2019-12-16 | 2020-04-10 | 南京工程学院 | Method for preparing nanocrystalline nickel-titanium shape memory alloy |
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