CN102409269B - Surface nano-modification method for titanium and aluminum-based intermetallic compound material - Google Patents
Surface nano-modification method for titanium and aluminum-based intermetallic compound material Download PDFInfo
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- CN102409269B CN102409269B CN201110360670.0A CN201110360670A CN102409269B CN 102409269 B CN102409269 B CN 102409269B CN 201110360670 A CN201110360670 A CN 201110360670A CN 102409269 B CN102409269 B CN 102409269B
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Abstract
The invention discloses a surface nano-modification method for a titanium and aluminum-based intermetallic compound material. The method comprises the following steps of: (1) linearly cutting a titanium and aluminum-based intermetallic compound material into a sample; and (2) cleaning the surface of the sample, and drying; (3) putting the sample into a high-energy ball mill for performing surface nano-treatment, wherein the rotating speed is 200-350 revolutions per minute, the size of a wear-resistant steel ball is 1-10 millimeters, the ball-material mass ratio is 10:1-40:1, and the ball milling time is 0.5-24 hours. By adopting a high-energy ball milling technology, strong surface plastic deformation of a TiAl-based metal at a high strain rate in a random strain direction is realized, surface crystal grains are fully refined, a nanostructure surface layer with a certain thickness and a grain size gradual change gradient is formed, the surface hardness is increased greatly, and the fatigue resistance and wear resistance of a product are enhanced effectively.
Description
Technical field
The present invention relates to a kind of surface modifying method, particularly relate to a kind of nano surface method of modifying that is applied to titanium aluminum based metal compound material.
Background technology
Making Nano surface technology is proposed by the scholar such as Lu Ke and Lv Jian, and making Nano surface technology is considered to for some time from now on can be by Application of micron in one of important technology of engineering reality.This technology be directly with the material surface of environmental exposure prepare certain thickness identical with basic material but there is the upper layer of nanocrystalline structure, thereby the performances such as the antifatigue of raising engineering materials, corrosion-resistant, rub resistance wearing and tearing.
Based on the grain refinement mechanism of viscous deformation induction, the patented technology that surface mechanical attrition technology (SMAT) is prepared nanometer layer as bulk metal material surface is extensively approved.The surface nanometer layer that the method is prepared does not change the chemical composition of material, successfully at many metals and alloy material surface synthesis of nano layer, as the making Nano surface of the various metals such as technically pure iron, soft steel, stainless steel, Ti alloy, Al alloy, Cu, magnesium alloy, eutectoid steel, Fe-Ni alloy, 40Cr and Co and alloy.The principal feature of SMAT is random strong viscous deformation to be incorporated into metal material surface, by snappiness projectile impact material surface, pass through high strain rate and repeat multi-direction shock, cause severe plastic deformation at metal material surface, constantly form various dissimilar lattice defects, with phase co-conversion, be used for coordinating viscous deformation, progressively realize grain refining.Due to bullet diameter large (being generally 8mm left and right), can obviously not change surfaceness, even in the situation that the treatment time extends, surfaceness is slightly reduced.
High-energy ball-milling process (HEBM) is a kind of simple, maturation, low cost, suitable material kind nanostructure production technology widely, and the nano level metal powder of preparing can reach 20nm～30nm.Also can realize the making Nano surface of material by HEBM technology, in its process, a large amount of spheroids, with random direction high-speed impact, friction material surface, make it produce continuous, multidirectional viscous deformation, finally obtain surface nanometer layer.Use HEBM technology to there is Nanosurface structural sheet hardness that equipment requirements easily realizes, obtains high and be combined tight etc. advantage with matrix.
The mechanism of the grain refinement mechanism of large size polycrystalline material in making Nano surface process and viscous deformation is similar, comprises the multi-motion mode of dislocation and the variation of grain boundary.There is substantial connection in the slippage of viscous deformation behavior and dislocation and the crystalline structure of material and stacking fault energy.In high stacking fault energy material, strain causes the formation of dislocation wall and structure cell, and the formation of subgrain boundary is by coarse-grain refinement; And in low stacking fault energy material, the pattern of viscous deformation will be made into the generation (especially under low temperature high strain rate) of mechanical twin by slippage.In recent years, many scholars have carried out further investigated to the making Nano surface mechanism of differing materials, find the basic establishment for body-centered cubic and face-centred cubic structure (FCC and BCC) material of this rule, but for the material of close-packed hexagonal structure (HCP), no matter its stacking fault energy height, all coordinate viscous deformation taking Praw texturing as main mode, and have the inter-metallic compound material of special construction, its making Nano surface research have not been reported.
TiAl base intermetallic compound, because the atom long-range order of himself is arranged and special bonding mode, shows the mechanical property with the distinct excellence of conventional alloys material.But its stretching plastic and fracture toughness property is at room temperature lower, this is that actuatable slip system number is limited because in the long range ordered structure of intermetallic compound, and superstructure dislocation Bai Shi vector is large, and dislocation is handed over slippage difficulty.Therefore, be different from conventional alloys material, TiAl base alloy is mainly deformed into master with mechanical twin at normal temperatures, and Al content is lower, twin effect in distortion is more obvious, only, improving after texturing temperature, is subject to heat activated effect, the mobility of various dislocations is improved, and just can show certain high-temp plastic.And most failure procedure occurs in material surface, comprise repeated stress failure, corrode tired, abrasion and corrosion etc., these failure procedures all the structure to bill of material surface layer and performance very responsive.Therefore the surface tissue that, effectively improves TiAl base alloy by contributing to optimize its military service performance, promote its industrialization, marketization application the effective excellent properties of this material of performance.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of surface microstructure size of effective thinning TiAl-base alloy, improves the nano surface method of modifying of the titanium aluminum based metal compound material of its surface hardness.
In order to solve the problems of the technologies described above, the nano surface method of modifying of titanium aluminum based metal compound material provided by the invention, step is as follows:
(1), titanium aluminum based metal compound line of material is cut into sample;
(2), sample surfaces is cleaned to then oven dry;
(3), sample is put into high energy ball mill and carried out Surface Nanocrystalline, using speed range is 200 revs/min～350 revs/min, using abrasion-proof steel ball size range is 1mm～10mm, using ball material quality is 10: 1～40: 1 than scope, and Ball-milling Time scope is 0.5 hour～24 hours.
In above-mentioned steps (1), titanium aluminum based metal compound material sample line is cut into the sample of 8mm × 8mm × 8mm～12mm × 12mm × 12m.
In above-mentioned steps (2), use ultrasonic cleaning sample surfaces, then put into dryer 55～65 degree insulations and take out for 2～3 hours.
Adopt the nano surface method of modifying of the titanium aluminum based metal compound material of technique scheme, the effectively surface microstructure size of thinning TiAl-base alloy, improve its surface hardness, be that a kind of cost is low, efficiency is high and be easy to the high-energy ball-milling process of industrialization, by strict process control, realize TiAl base alloy has been carried out to effective nano surface modification.Its beneficial effect is to pass through high-energy ball-milling process, the high strain rate to TiAl Base Metal, the surperficial intense plastic strain of the direction of adjusting to changed conditions are realized, make its surface microstructure obtain abundant refinement, and form certain thickness, to there is grain-size depth-graded nano structure superficial layer, greatly increased surface hardness.
In sum, the present invention is a kind of surface microstructure size of effective thinning TiAl-base alloy, improves that its surface hardness and cost are low, efficiency is high and is easy to the nano surface method of modifying of the titanium aluminum based metal compound material of industrialization.
Brief description of the drawings
The schematic diagram of Fig. 1 high-energy ball milling treatment technology.
Fig. 2 is tissue topography's image in sample longitudinal section after high-energy ball milling is processed.
Fig. 3 is tissue topography's image of specimen surface nanometer layer after high-energy ball milling is processed.
Fig. 4 is the hardness value of specimen surface after high-energy ball milling is processed.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1:
The nano surface method of modifying of titanium aluminum based metal compound material, step is as follows:
(1), titanium aluminum based metal compound material sample line is cut into the sample of 8mm × 8mm × 8mm;
(2), use ultrasonic cleaning sample surfaces, then put into dryer 55 degree insulations taking-up in 2 hours;
(3), sample put into high energy ball mill carry out Surface Nanocrystalline, using speed range is 200 revs/min, using abrasion-proof steel ball size range is 1mm, using ball material quality is 10: 1 than scope, Ball-milling Time scope is 0.5 hour.
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the surface microstructure size of the effective thinning TiAl-base alloy of the present invention, improve its surface hardness, be that a kind of cost is low, efficiency is high and be easy to the high-energy ball-milling process of industrialization, by strict process control, realize TiAl base alloy has been carried out to effective nano surface modification.Its beneficial effect is to pass through high-energy ball-milling process, the high strain rate to TiAl Base Metal, the surperficial intense plastic strain of the direction of adjusting to changed conditions are realized, make its surface microstructure obtain abundant refinement, and form certain thickness, to there is grain-size depth-graded nano structure superficial layer, greatly increased surface hardness.
Embodiment 2:
The nano surface method of modifying of titanium aluminum based metal compound material, step is as follows:
(1), titanium aluminum based metal compound material sample line is cut into the sample of 10mm × 10mm × 10m;
(2), use ultrasonic cleaning sample surfaces, then put into dryer 60 degree insulations taking-up in 2.5 hours;
(3), sample put into high energy ball mill carry out Surface Nanocrystalline, using speed range is 300 revs/min, using abrasion-proof steel ball size range is 6mm, using ball material quality is 20: 1 than scope, Ball-milling Time scope is 12 hours.
Embodiment 3:
The nano surface method of modifying of titanium aluminum based metal compound material, step is as follows:
(1), titanium aluminum based metal compound material sample line is cut into the sample of 12mm × 12mm × 12m;
(2), use ultrasonic cleaning sample surfaces, then put into dryer 65 degree insulations taking-up in 3 hours;
(3), sample put into high energy ball mill carry out Surface Nanocrystalline, using speed range is 350 revs/min, using abrasion-proof steel ball size range is 10mm, using ball material quality is 40: 1 than scope, Ball-milling Time scope is 24 hours.
Embodiment 4:
The nano surface method of modifying of titanium aluminum based metal compound material, step is as follows:
(1), titanium aluminum based metal compound material sample line is cut into the sample of 9mm × 9mm × 9m;
(2), use ultrasonic cleaning sample surfaces, then put into dryer 55 degree insulations taking-up in 3 hours;
(3), sample put into high energy ball mill carry out Surface Nanocrystalline, using speed range is 320 revs/min, using abrasion-proof steel ball size range is 4mm, using ball material quality is 25: 1 than scope, Ball-milling Time scope is 8 hours.
Embodiment 5:
The nano surface method of modifying of titanium aluminum based metal compound material, step is as follows:
(1), titanium aluminum based metal compound material sample line is cut into the sample of 11mm × 11mm × 11m;
(2), use ultrasonic cleaning sample surfaces, then put into dryer 65 degree insulations taking-up in 2 hours;
(3), sample put into high energy ball mill carry out Surface Nanocrystalline, using speed range is 250 revs/min, using abrasion-proof steel ball size range is 8mm, using ball material quality is 30: 1 than scope, Ball-milling Time scope is 18 hours.
Claims (1)
1. a nano surface method of modifying for titanium aluminum based metal compound material, is characterized in that: step is as follows:
(1), titanium aluminum based metal compound line of material is cut into sample, titanium aluminum based metal compound material sample line is cut into the sample of 8mm × 8mm × 8mm～12mm × 12mm × 12m;
(2), sample surfaces is cleaned, then dry, use ultrasonic cleaning sample surfaces, then put into dryer 55～65 degree insulations taking-up in 2～3 hours;
(3), sample is put into high energy ball mill and carried out Surface Nanocrystalline, using speed range is 200 revs/min～350 revs/min, using abrasion-proof steel ball size range is 1mm～10mm, and using ball material quality is 10:1～40:1 than scope, and Ball-milling Time scope is 0.5 hour～24 hours.
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| CN104947013B (en) * | 2015-05-26 | 2016-12-07 | 昆明理工大学 | A kind of preparation method of double-deck gradient sphere grinding making Nano surface copper rod |
| CN105177645B (en) * | 2015-07-27 | 2017-05-31 | 昆明理工大学 | A kind of preparation method of MULTILAYER COMPOSITE gradient nano pure copper material |
| CN109332872A (en) * | 2018-11-27 | 2019-02-15 | 中国航空制造技术研究院 | The method for improving Ti2AlNb alloy diffusion weldering efficiency |
| CN113136540B (en) * | 2021-04-09 | 2022-09-02 | 贵州师范大学 | Preparation method of titanium alloy nano composite gradient strengthening layer |
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