CN108754365A - A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods - Google Patents

A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods Download PDF

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Publication number
CN108754365A
CN108754365A CN201810515386.8A CN201810515386A CN108754365A CN 108754365 A CN108754365 A CN 108754365A CN 201810515386 A CN201810515386 A CN 201810515386A CN 108754365 A CN108754365 A CN 108754365A
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CN
China
Prior art keywords
methods
magnesium alloy
block materials
twin
density twin
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CN201810515386.8A
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Chinese (zh)
Inventor
吴远志
叶拓
李庆芬
刘伟
邓彬
周小桃
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湖南工学院
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Priority to CN201810515386.8A priority Critical patent/CN108754365A/en
Publication of CN108754365A publication Critical patent/CN108754365A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00Casting ingots, e.g. from ferrous metals
    • B22D7/005Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00Casting ingots, e.g. from ferrous metals
    • B22D7/06Ingot moulds or their manufacture
    • B22D7/064Cooling the ingot moulds
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Abstract

A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods, casting including alloy and plastic processing, the casting mould of the alloy is rectangular water cooled copper mould, mold compact dimensions are 150mm*150mm*150mm, mold cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min;The plastic processing mode of the alloy is that the small passage of room temperature strains the forging of high strain rate three-dimensional, and forging equipment is pneumatic hammer, and passage dependent variable is 5 ± 0.5%, and rolling pass is 12 passages.The present invention prepares the cast sturcture of coarse grains and approximate solid solution by water cooled copper mould, without heat treatment before ingot casting plastic processing;High density twin structure is obtained using room temperature, high speed, the strain of small passage, the deformation of three-dimensional cyclic loading simultaneously, is suitable for the production of high intensity block ZK21 magnesium alloys.

Description

A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods

Technical field

The present invention relates to a kind of twin structure ZK21 magnesium alloy preparation methods, and in particular to a kind of high density twin structure ZK21 magnesium alloy block materials preparation methods.

Background technology

Magnesium alloy is most light structural metallic materials, has high specific strength, high specific stiffness, good damping capacity, excellent Thermal conductivity and electric conductivity, good dimensional stability, electromagnetic wave shielding and the characteristics such as be easily recycled.In recent years, with the energy With becoming increasingly conspicuous for environmental problem, magnesium alloy emerges rapidly as new engineering material, is increasingly becoming aluminium alloy, steel and engineering The ideal substitute of the engineering material such as plastics has weight in fields such as aerospace, communications and transportation, weaponry and electronic apparatus The application value and wide application prospect wanted.

But the lag of low strength and the high-strength magnesium alloy exploitation of magnesium alloy seriously constrains the extensive of magnesium alloy and answers With therefore, the research and development of high-strength magnesium alloy meets the important development direction of industrial requirement as it.Twinning strengthening is metal How the effective ways of material reinforcement prepare high density twin structure and provide the heat that enough reinforcings become metal material research Point, the methods of current electrolysis deposition, magnetron sputtering deposition can only prepare film scale high density twin, high density twin structure block Body material preparation method is also rarely reported.

Invention content

The technical problem to be solved by the invention is to provide a kind of high density twin structure ZK21 magnesium alloy block materials systems Preparation Method, this method is simple for process, high in machining efficiency, can efficient hardening ZK21 magnesium alloys.

The technical solution adopted by the present invention to solve the technical problems is:A kind of high density twin structure ZK21 magnesium alloy blocks Body material preparation method includes the casting and plastic processing of alloy, and the casting mould of the alloy is rectangular water cooled copper mould, mold Compact dimensions are 150mm*150mm*150mm, and mold cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min Clock;The plastic processing mode of the alloy is that the small passage of room temperature strains the forging of high strain rate three-dimensional, and forging equipment is pneumatic hammer, Passage dependent variable is 5 ± 0.5%, and rolling pass is 12 passages.

Further, the rectangular water cooled copper mould mold cooling water capacity is 300 ± 5ml, more preferable 300ml.

Further, the rectangular water cooled copper mould cooling water flow velocity is 3 ± 0.2 liters/min, more preferable 3 liters/min.

Further, the state before the alloy plasticity processing is as cast condition block materials.

Further, passage dependent variable is 5 ± 0.2%, more preferable 5%.

Further, pneumatic hammer forge number be 200 ± 5 times/min, more preferable 200 times/min, rapidity of blow be 5 ± 0.5m/s, more preferable 5 ± 0.5m/s.

The beneficial effects of the present invention are:

(1) casting mould of alloy is rectangular water cooled copper mould, and mold compact dimensions are 150mm*150mm*150mm, mold Cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min, at this time ingot casting can obtain tissue it is coarse etc. Axialite tissue so that Grain Boundary Sliding is difficult to play a role in follow-up plastic deformation, to promote twinning, ensures high density The formation of twin;In addition, alloying element has little time to be precipitated during being quickly cooled down, single phase solid solution is obtained substantially, is being moulded Property processing before without being heat-treated, shorten manufacturing cycle.

(2) the plastic processing temperature of alloy is room temperature, and basal slip, Prismatic slip and conical surface sliding at this temperature is difficult to Start, plastic deformation is mainly carried out with twin mechanism, to ensure the formation of high density twin.

(3) plastic processing mode is that the small passage of room temperature strains high strain rate multiway forging, and forging equipment is pneumatic hammer, road Secondary dependent variable is 5 ± 0.5%;It is twin to become plasticity since the time that can be used for dislocation movement by slip is shorter under the conditions of high-speed deformation Main Deformation Mechanism ensures the formation of high density twin;Stress concentration under three directional loads ringing near initial crystal boundary It is minimized, recrystallization is difficult to start near initial crystal boundary, and deformation and energy storage is mainly consumed by twin mechanism, is further ensured that High density twin formation.Using 5 ± 0.5% small passage dependent variable, the dislocation that initial crystal boundary is nearby accumulated is not enough to start again Crystallization, deformation and energy storage are mainly consumed by twin mechanism, also ensure the formation of high density twin to a certain extent.

Description of the drawings

Fig. 1 is the microstructure morphology of casting alloy;

Fig. 2 is that the small passage of room temperature strains high strain rate multiway forging process schematic representation;

Fig. 3 is the microstructure morphology of the 3rd passage alloy in 1 forming process of embodiment;

Fig. 4 is the microstructure morphology of the 6th passage alloy in 1 forming process of embodiment;

Fig. 5 is the microstructure morphology of the 9th passage alloy in 1 forming process of embodiment;

Fig. 6 is the microstructure morphology of the 12nd passage alloy in 1 forming process of embodiment;

Fig. 7 is high density twin structure TEM pictures prepared by embodiment 1;

Fig. 8 is the low power microstructure morphology of high density twin structure alloy prepared by embodiment 1;

Fig. 9 is that the room temperature before and after ZK21 magnesium alloy embodiments draws high curve.

Specific implementation mode

The invention will be further described with reference to the accompanying drawings and embodiments.

Embodiment 1

ZK21 magnesium alloys selected by the present embodiment, ingredient Mg-2Zn-0.45Zr, sample length, width and height are respectively before processing 35mm、35mm、40mm。

A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods, include the following steps:

1) casting technique:ZK21 magnesium alloy fused mass is prepared according to magnesium alloy smelting method, melt is poured into rectangular water-cooled copper Mould, copper mold compact dimensions are 150mm*150mm*150mm, and mold cooling water capacity is 300ml, and cooling water flow velocity is 3 liters/min Clock, casting process prevent from burning by spreading Cosan, take out ingot casting after cooling;Under the action of water cooled copper mould, alloy graining It is organized as the equiax crystal of coarse grains, and the second phase not coarse near crystal boundary, it is basic to obtain single phase solid solution body tissue, such as scheme Shown in 1;

2) the small passage strain high strain rate three-dimensional forging of room temperature:Heat processing and forming carries out on pneumatic hammer, pneumatic hammer It is 200 times/min to forge number, and rapidity of blow 5m/s, it is suitable that three-dimensional forging technology is as shown in Fig. 2, forge face by A-B-C-A ... Sequence carries out, and often forges a face and is counted as a time, pass deformation 5%.

Sample surfaces are good after hot-working, without apparent crackle, are lost without apparent macroscopic view.

With reference to the microstructure and mechanical property of the high density twin structure alloy that experimental data obtains embodiment 1 It can be analyzed.

1. microstructure characterizes:It chooses sample core in embodiment 1 and prepares microstructure observation's sample, by edge sample, in advance Mill, polishing, corrosion, using the sample after the micro- sem observation corrosion of MM6 type horizontal metallurgicals, the plane of observation is forged before sampling Direction, displaing micro tissue topography is respectively as shown in Fig. 3-Fig. 6 and Fig. 8.High density feather organization is divided using JEM-3010 Analysis, sample is standby through being electrolysed double sprays, and at -35 DEG C or so, current control is controlled in 50mA or so, voltage 65 for double spray temperature controls Between~70V, displaing micro tissue topography is as shown in Figure 7.

It can be seen that in embodiment 1 from Fig. 3-Fig. 8, deform early period, a large amount of twins are generated in initial grain, in crystal boundary On almost without recrystal grain is observed, as shown in Figure 3;With the continuation of deformation, twin density is continuously increased, and is not observed To recrystallized structure, as shown in Figure 4-Figure 6;Tem observation is carried out to high density feather organization, it can be found that twin lamellae thickness is about It it is 0.5-1 μm, as shown in Figure 7.In addition, being carried out to it has been observed that equal in entire sample interior under low power light microscope High density feather organization is formed, not local feature, as shown in Figure 8.

2. Mechanics Performance Testing:According to the standard of national standard GB228-2002, will there is high density described in the embodiment of the present invention The ZK21 magnesium alloys of twin structure are processed into standard tensile specimen and carry out tensile tests at room, and draw direction is parallel to forging before sampling Next forging direction in direction is made, measured room temperature draws high curve as shown in figure 9, its mechanical property is shown in Table 1.

It is from Fig. 9 and table 1 as can be seen that strong with the yield strength of the invention that can greatly improve ZK21 magnesium alloys and tension Degree, intensity of the ZK21 magnesium alloys block materials with superelevation with high density twin structure of preparation.

The mechanical property of 1 embodiment processed sample of table

Embodiment Yield strength (MPa) Tensile strength (MPa) Before deformation 126.2 211.9 Embodiment 1 281.9 407.7

High density twin structure ZK21 magnesium alloy block materials preparation methods of the present invention, pass through the work of water cooled copper mould With coarse isometric and approximate solid solution cast sturcture being obtained, without heat treatment before ingot casting plastic processing;Using low temperature, high speed, Small passage strain and three-dimensional cyclic loading obtain high density twin structure, and the high density twin structure ZK21 magnesium alloys of preparation have Superhigh intensity;In addition, the process-cycle of the invention is short, it is suitable for the mass production of block ZK21 magnesium alloys.

Finally it is pointed out that above example is only intended to illustrate rather than limitation, in fact, of the invention Method other alloys are equally applicable;When those skilled in the art do simple replacement to product under the teachings of the present invention, Still fall within protection scope of the present invention.

Claims (10)

1. a kind of high density twin structure ZK21 magnesium alloy block materials preparation methods, it is characterised in that:Casting including alloy And plastic processing, the casting mould of the alloy is rectangular water cooled copper mould, and mold compact dimensions are 150mm*150mm*150mm, Mold cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min;The plastic processing mode of the alloy is The small passage strain high strain rate three-dimensional forging of room temperature, forging equipment is pneumatic hammer, and passage dependent variable is 5 ± 0.5%, deforms road Secondary is 12 passages.
2. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 1, it is characterised in that: The rectangular water cooled copper mould mold cooling water capacity is 300 ± 5ml.
3. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 2, it is characterised in that: The rectangular water cooled copper mould mold cooling water capacity is 300ml.
4. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 1 or 2 or 3, special Sign is:The rectangular water cooled copper mould cooling water flow velocity is 3 ± 0.2 liters/min.
5. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 4, it is characterised in that: The water cooled copper mould cooling water flow velocity is 3 liters/min.
6. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 1 or 2 or 3, special Sign is:State before the alloy plasticity processing is as cast condition block materials.
7. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 1 or 2 or 3, special Sign is:Passage dependent variable is 5 ± 0.2%.
8. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 7, it is characterised in that: Passage dependent variable is 5%.
9. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 1 or 2, feature exist In:The number that forges of pneumatic hammer is 200 ± 5 times/min, and rapidity of blow is 5 ± 0.5m/s.
10. high density twin structure ZK21 magnesium alloy block materials preparation methods according to claim 9, feature exist In:The number that forges of pneumatic hammer is 200 times/min, rapidity of blow 5m/s.
CN201810515386.8A 2018-05-25 2018-05-25 A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods CN108754365A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101463454A (en) * 2009-01-16 2009-06-24 中南大学 Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation
CN103911569A (en) * 2012-12-28 2014-07-09 北京有色金属研究总院 Method for weakening anisotropy of wrought magnesium alloy product
KR20150033811A (en) * 2013-09-24 2015-04-02 한국기계연구원 Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby
CN107034400A (en) * 2017-03-23 2017-08-11 中南大学 One kind eliminates the anisotropic forging technology of big specification AQ80M magnesium alloy bearing carriers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101463454A (en) * 2009-01-16 2009-06-24 中南大学 Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation
CN103911569A (en) * 2012-12-28 2014-07-09 北京有色金属研究总院 Method for weakening anisotropy of wrought magnesium alloy product
KR20150033811A (en) * 2013-09-24 2015-04-02 한국기계연구원 Method for manufacturing forged magnesium alloy mebmer having enhanced hardness and forged magnesium alloy member manufactured thereby
CN107034400A (en) * 2017-03-23 2017-08-11 中南大学 One kind eliminates the anisotropic forging technology of big specification AQ80M magnesium alloy bearing carriers

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
吴远志: "《湖南大学博士学位论文》", 31 December 2012 *
吴远志等: "锻造方式对ZK21镁合金显微组织和力学性能的影响", 《中南大学学报》 *

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