CN103233272A - Method for phase separation of original ecological microcrystals in Bi-Mn alloy by using stereospecific polymerization - Google Patents
Method for phase separation of original ecological microcrystals in Bi-Mn alloy by using stereospecific polymerization Download PDFInfo
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Abstract
The invention relates to a method for phase separation of original ecological microcrystals in a Bi-Mn alloy by using stereospecific polymerization and belongs to the technical field of alloy structure control development. According to the method, a used device is a traditional general device and comprises electromagnetic field equipment, a water circulation protection system, a heating furnace and a temperature control system. The method disclosed by the invention aims at realizing phase separation by generating a specific surface layer of an alloy progenetic phase under the electromagnetic field. The method is characterized in that the special surface layer is formed by using segregation during alloy solidification caused by using the magnetocrystalline anisotropy of the crystals under the action of the electromagnetic field, namely, after easy magnetization axises of the crystals turn to the direction of the magnetic field under the action of the electromagnetic field, the crystals generate orientation, migration even polymerization phenomena under the traction effect of the electromagnetic force, a specific alloy progenetic phase surface layer is formed by segregation on the surface of sample, and therefore phase separation is achieved.
Description
Technical field
The present invention relates to the method that ecosystem crystallite tactic polymerization is separated in a kind of Bi-Mn alloy, provide new process orientation for utilizing electromagnetic field to carry out the exotic materials preparation, belong to alloy structure control studying technological domain.
Background technology
The material workpiece is in the process of using, because the restriction of itself characteristic might not be satisfied the work under some specific environments, the film of one or more layers differing materials of the material workpiece surface-coated of for this reason being everlasting reaches strengthening surface or makes the surface have the purpose of specific function.Yet in recent years, fast development along with science and technology, increasing modern technique is applied in the middle of the preparation, the course of processing of material, wherein electromagnetic field can produce the regular weaves that aligns because of it in the middle of the process of setting of material, improve the character of material, obtained people's attention, theory and experimental study in materials science applications also increase rapidly.At present, be applied at aspects such as crystallization and freezing, powder metallurgy, electrolysis, sintering, thermal treatment, plastic working, suspended smeltings, relate to a plurality of fields such as metallic substance, stupalith, macromolecular material.Find that wherein alloy solidifies the weave construction that rule can occur aligning under electromagnetic field, even in orientation, migration and the polymerism of outside surface generation material, form the special upper layer of one deck.For this reason, at the existing defective of obtaining material special surface layer method, as be subjected to the limiting surface layer instability of processing condition, price is high, complex process etc. are incorporated into electromagnetic field in the material crystallization and freezing process, form a kind of primary special list surface layer matrix material.
Summary of the invention
Defective at prior art, the purpose of this invention is to provide a kind of method that ecosystem crystallite tactic polymerization is separated in the Bi-Mn alloy of impelling under electromagnetic field, the skew combinate form becomes the special list surface layer when it is characterized in that utilizing under the effect of electromagnetic field the magnetocrystalline anisotropy of crystal to make alloy graining.
The method that ecosystem crystallite tactic polymerization is separated in a kind of Bi-Mn alloy, it is characterized in that having following process: choose purity and be 99.0% metal Bi and purity and be 99.5% metal M n, in the vacuum induction process furnace, melt out the Bi-Mn alloy of massfraction 6%Mn, and adopt the mode of line cutting to intercept diameter 10mm, the segment of length 30mm, the clean back of surface finish dries up with the alcohol flushing.The Bi-6%Mn alloy sample is put into process furnace, place the 10T magnetic field environment to be heated to 345 ℃, behind the constant temperature 30min, be cooled to solidify fully with the speed of 0.1 ℃/min; With the gained sample respectively along horizontal and vertical incision, grinding and polishing, and corroding; Then sample is made instrument and detected, find to become nascent BiMn phase in the inclined to one side combinate form of specimen surface, in the form of a ring, himself be grown to bar-shapedly, arrange for rule oriented, do not have nascent BiMn phase at the sample center substantially; Thereby realize being separated.
The used device of ecosystem crystallite tactic polymerization phase disengagement method in a kind of Bi-Mn alloy, it is the device of traditional common, includes: process furnace stationary installation (1), water cycle sleeve (2), process furnace (3), electromagnetic field equipment (4), Bi-Mn alloy (5), temperature controlling system (6), thermopair (7); It is good that the Bi-6%Mn alloy sample is put into the process furnace internal fixing, places the 10T steady magnetic field environment with water cycle sleeve protection, utilizes temperature controlling system that process furnace is warmed up to 345 ℃, behind the insulation 30min, is cooled to solidify fully with the speed of 0.1 ℃/min.
We's ratio juris is after making the crystal easy magnetizing axis turn to field direction under the effect of electromagnetic field, crystal is subjected to the draw of electromagnetic force, be orientated, migration even polymerism, thereby realized the separation of phase, become the special primary upper layer of one deck in the inclined to one side combinate form of specimen surface, its separation mechanism is as follows:
Become a magneto-dipole after crystal with magnetic is magnetized in electromagnetic field, the magnetic force that acts on this magnetic crystal is:
(1)
F in the formula
rBe crystal suffered magnetic force in magnetic field, unit: N; μ
0Be permeability of vacuum μ
0=4 π * 10
-7, unit: Wb (m ﹡ A); K is that the ratio magnetic of crystal divides coefficient, unit: m
3/ kg; M is the quality of crystal, unit: kg; H is the magneticstrength around the crystal, unit: A/m; GradH
rBe field gradient, the A/m of unit
2
Also there is magnetic interaction power in side direction between the crystal after the magnetization, and crystal is repelled mutually, this reactive force equation:
(2)
In the formula, μ is the magnetic permeability of crystal, and r is distance between two poles, H
ExRepresent the magnetic pole intensity of adjacent crystal, V
1And V
2Represent the volume of adjacent crystal crystal grain respectively, χ
cBe the volume susceptibility on the easy magnetizing axis, this power increases along with reducing of lateral distance between crystal.
Crystal also is subjected to the viscosity resistance F of liquid when motion
dInfluence, this power is followed the stokes law
In the formula, η is viscosity, and r is the radius of crystal, and v is the movement velocity of crystal.
Above-mentioned 3 kinds of power have determined the distributional pattern of crystal, because the adding of electromagnetic field forms the ring-type tissue that a kind of crystal distributes along the sample top layer the most at last under the effect of above-mentioned power.In addition, the thickness in poly-partially zone, namely the size of ring-type tissue also has important relation with concrete alloying constituent.
Description of drawings
Fig. 1 is the device synoptic diagram of the inventive method.Among the figure: 1 process furnace stationary installation; 2 water cycle sleeves; 3 process furnace; 4 electromagnetic field equipment; 5 samples; 6 temperature controlling systems; 7 thermopairs.
Fig. 2 is the specific examples result of present method, is example with the Bi-6%Mn alloy, is heated to 345 ℃, and constant temperature is after 30 minutes, is cooled to alloy with the speed of 0.1 ℃/min and solidifies resulting sample tissue microstructure figure fully.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the inventive method is done and to describe in further detail.
Choose purity and be 99.0% metal Bi and purity and be 99.5% metal M n, in the vacuum induction process furnace, melt out the Bi-Mn alloy of massfraction 6%Mn, and adopt the mode of line cutting to intercept diameter 10mm, and the segment of length 30mm, the clean back of surface finish dries up with the alcohol flushing.The Bi-6%Mn alloy sample is put into process furnace, place the 10T magnetic field environment to be heated to 345 ℃, behind the constant temperature 30min, be cooled to solidify fully with the speed of 0.1 ℃/min.Respectively along horizontal and vertical incision, grinding and polishing, and corroding is made instrument to sample then and is detected with the gained sample.
As shown in Figure 1, employed device is the traditional common device among the inventive method embodiment, comprises electromagnetic field equipment, water cycle securing system, process furnace, temperature controlling system.Process furnace is placed the electromagnetic field central zone with water cycle protection; it is fixing that alloy sample is put into process furnace, by temperature controlling system process furnace is warming up to certain temperature, after insulation for some time; begin cooling according to certain speed, solidify fully until alloy sample.
The detected result of present embodiment is referring to Fig. 2.As can be seen from the figure nascent BiMn is poly-partially in the form of a ring at the sample outside surface under the action of a magnetic field, himself is grown to bar-shapedly, and is the rule oriented arrangement.Substantially there is not nascent BiMn phase at the sample center.
The specific embodiment mode
Below in conjunction with accompanying drawing the embodiment of the inventive method is done and to describe in further detail.
Choose purity and be 99.0% metal Bi and purity and be 99.5% metal M n, in the vacuum induction process furnace, melt out the Bi-Mn alloy of massfraction 6%Mn, and adopt the mode of line cutting to intercept diameter 10mm, and the segment of length 30mm, the clean back of surface finish dries up with the alcohol flushing.The Bi-6%Mn alloy sample is put into process furnace, place the 10T magnetic field environment to be heated to 345 ℃, behind the constant temperature 30min, be cooled to solidify fully with the speed of 0.1 ℃/min.Respectively along horizontal and vertical incision, grinding and polishing, and corroding is made instrument to sample then and is detected with the gained sample.
As shown in Figure 1, employed device is the traditional common device among the inventive method embodiment, comprises electromagnetic field equipment, water cycle securing system, process furnace, temperature controlling system.Process furnace is placed the electromagnetic field central zone with water cycle protection; it is fixing that alloy sample is put into process furnace, by temperature controlling system process furnace is warming up to certain temperature, after insulation for some time; begin cooling according to certain speed, solidify fully until alloy sample.
The detected result of present embodiment is referring to Fig. 2.As can be seen from the figure nascent BiMn is poly-partially in the form of a ring at the sample outside surface under the action of a magnetic field, himself is grown to bar-shapedly, and is the rule oriented arrangement.Substantially there is not nascent BiMn phase at the sample center.
Claims (2)
1. the method that ecosystem crystallite tactic polymerization is separated in the Bi-Mn alloy, it is characterized in that having following process: choose purity and be 99.0% metal Bi and purity and be 99.5% metal M n, in the vacuum induction process furnace, melt out the Bi-Mn alloy of massfraction 6%Mn, and adopt the mode of line cutting to intercept diameter 10mm, the segment of length 30mm, the clean back of surface finish dries up with the alcohol flushing.The Bi-6%Mn alloy sample is put into process furnace, place the 10T magnetic field environment to be heated to 345 ℃, behind the constant temperature 30min, be cooled to solidify fully with the speed of 0.1 ℃/min.With the gained sample respectively along horizontal and vertical incision, grinding and polishing, and corroding; Then sample being made instrument and detected, find to become nascent BiMn phase in the inclined to one side combinate form of specimen surface, in the form of a ring, himself be grown to bar-shapedly, is that rule oriented is arranged; Substantially there is not nascent BiMn phase at the sample center; Thereby realize being separated.
2. the used device of ecosystem crystallite tactic polymerization phase disengagement method in the Bi-Mn alloy, it is the device of traditional common, includes: process furnace stationary installation (1), water cycle sleeve (2), process furnace (3), electromagnetic field equipment (4), Bi-Mn alloy (5), temperature controlling system (6), thermopair (7); It is good that the Bi-6%Mn alloy sample is put into the process furnace internal fixing, places the 10T steady magnetic field environment with water cycle sleeve protection, utilizes temperature controlling system that process furnace is warmed up to 345 ℃, behind the insulation 30min, is cooled to solidify fully with the speed of 0.1 ℃/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107297493A (en) * | 2017-06-13 | 2017-10-27 | 同济大学 | A kind of high-coercive force MnBi nano particles and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1613580A (en) * | 2004-09-23 | 2005-05-11 | 上海交通大学 | Texture controlling method of high temperature molten crystal growth axially |
| CN1740370A (en) * | 2005-09-01 | 2006-03-01 | 上海交通大学 | Axially oriented directional solidification process in magnetic field |
| CN102423800A (en) * | 2011-11-25 | 2012-04-25 | 上海工程技术大学 | Crystal oriented growth control method of magnetic material in low-temperature gradient |
| CN103056347A (en) * | 2013-01-09 | 2013-04-24 | 上海大学 | Method for controlling dendritic crystal orientation of oriented solidification structure by high-intensity magnetic field |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1613580A (en) * | 2004-09-23 | 2005-05-11 | 上海交通大学 | Texture controlling method of high temperature molten crystal growth axially |
| CN1740370A (en) * | 2005-09-01 | 2006-03-01 | 上海交通大学 | Axially oriented directional solidification process in magnetic field |
| CN102423800A (en) * | 2011-11-25 | 2012-04-25 | 上海工程技术大学 | Crystal oriented growth control method of magnetic material in low-temperature gradient |
| CN103056347A (en) * | 2013-01-09 | 2013-04-24 | 上海大学 | Method for controlling dendritic crystal orientation of oriented solidification structure by high-intensity magnetic field |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107297493A (en) * | 2017-06-13 | 2017-10-27 | 同济大学 | A kind of high-coercive force MnBi nano particles and preparation method thereof |
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Application publication date: 20130807 |