CN101956107A - Method for controlling primary dendrite arm spacing of directional solidification by adding composite rare earth - Google Patents
Method for controlling primary dendrite arm spacing of directional solidification by adding composite rare earth Download PDFInfo
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- CN101956107A CN101956107A CN 201010508934 CN201010508934A CN101956107A CN 101956107 A CN101956107 A CN 101956107A CN 201010508934 CN201010508934 CN 201010508934 CN 201010508934 A CN201010508934 A CN 201010508934A CN 101956107 A CN101956107 A CN 101956107A
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Abstract
The invention relates to a method for controlling primary dendrite arm spacing of directional solidification by adding composite rare earth and belongs to the technical field of directional solidification. The method is characterized by comprising the following components in percentage by mass: 4.5 percent of alloy component Cu, 0.1 to 0.5 percent of composite rare earth with 50 percent of Ce and 50 percent of La, and balance of Al. The method comprises the following steps of: performing directional solidification on an alloy in a crucible pull-down vacuum directional solidification furnace of 5kg, wherein the temperature is controlled by three groups of thermocouples arranged on a heating element, and the working temperature is controlled to be +/-5K. The crystal growth rate is controlled by controlling the pull-down rate of a motor; the withdrawing rate of the motor can be approximately equal to the crystal growth rate when the withdrawing rate is not great (less than 100 r/min); and the temperature gradient is controlled by controlling three-section standing temperatures. In the method, the composite rare earth is added into an Al-Cu alloy with 4.5 percent of Cu so as to acquire the internal relations between the composite rare earth and the primary dendrite arm spacing through relevant parameter data.
Description
Technical field
The invention belongs to the directional solidification technique field, refer in particular to a kind of method that adds compound rare-earth control directional freeze primary dendritic spacing.
Background technology
In metal solidification process, metal is a kind of main mode with the form growth of dentrite.And the size of dentrite and form have very big influence to the performance of metal.Dendrite interval is exactly one of them most important parameter, and the generation of microsegregation in the size of spacing and the tissue, the formation that is mingled with, tiny crack and shrinkage porosite etc. all has confidential relation.Especially primary dendritic spacing is the important solidified structure parameter that influences solute in the alloy structure, intermediate phase, eutectic phase or Impurity Distribution, study its form mechanism and and the dependence of curing condition, help the alloy solidified structure is implemented accurately prediction and control, therefore have crucial meaning improving alloy property.
Crystal is when directional solidification growth, and the column crystal direction of growth is parallel with direction of heat flow, and both directions are opposite, and crystal is grown in liquid with certain speed.The dendrite tip temperature equates that with the metal or alloy liquidus temperature its crystal boundary is parallel with the main shaft of dendrite, and the main shaft of dendrite constantly produces branch, forms a full die at last.For the dendrite that is arranged in parallel, their interval is defined as primary dendritic spacing.In directional solidification theory, crystal growth rate is the important technical parameter in the directional solidification technique, is an important factor that influences metal freezing, dendritic growth.Determined crystalline microstructure (being dendrite interval), the little then crystal grain of dendrite interval is tiny, and alloy property improves, and therefore can satisfy the needs in fields such as engineering.Generally concentrate at present both at home and abroad the analysis of processing parameter aspect, the influence of oriented freezing organization is not had comprehensive research at present as yet about compound rare-earth for the research of the influence factor of oriented freezing organization.
The present invention is directed to this problem, developed a kind of method that adds compound rare-earth control directional freeze primary dendritic spacing.
Summary of the invention
Purpose of the present invention provides a kind of method that adds compound rare-earth control directional freeze primary dendritic spacing.
The concrete technical scheme of the present invention is directional freeze Al-4.5%Cu alloy primary dendritic spacing to be controlled, to satisfy the demand in fields such as engineering.It is characterized in that: (Ce50% wherein, La50%), all the other are Al to alloying constituent (massfraction %) Cu4.5% compound rare-earth 0.1-0.5%.Alloy is carried out directional freeze vacuum oriented the solidifying of 5kg crucible pull-down in the stove, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.The placement of thermopair parallels with the crucible direction of heat flow at work, in the heating and cooling process, records temperature distribution with thermopair.In order to guarantee furnace temperature, keep water coolant (steady temperature) in constant water pressure, the fixing distance between water coolant and the heating platform simultaneously, thermograde is constant when guaranteeing work.Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate.Come the controlled temperature gradient by controlling three sections dwell temperature.The present invention selects for use in the Al-4.5%Cu alloy and adds compound rare-earth, by the correlation parameter data of table 1, draws the internal relation of compound rare-earth and primary dendritic spacing.Table 1 is correlation parameter data of the present invention.
Table 1 correlation parameter data
By changing the add-on of compound rare-earth, record dendrite interval and see Table 2.
By table 2 as seen, the add-on of compound rare-earth can be preferably 0.4%
Table 2 adds the primary dendritic spacing and the lamellar spacing of the compound rare-earth of heterogeneity
| Numbering | Compound rare-earth | Cross section primary dendritic spacing μ m | Vertical section lamellar spacing μ m |
| 01 | 0.1％ | 119.601 | 210.612 |
| 02 | 0.2％ | 108.003 | 185.714 |
| 03 | 0.3％ | 104.090 | 163.415 |
| 04 | 0.4％ | 93.146 | 141.531 |
| 05 | 0.5％ | 115.396 | 162.243 |
Embodiment
Embodiment 1
Select alloying constituent (massfraction %) Cu4.5% compound rare-earth 0.1% for use, all the other are Al.Alloy is carried out directional freeze vacuum oriented the solidifying of 5kg crucible pull-down in the stove, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.Keeping under identical temperature of superheat and overheated time conditions, carrying out directional freeze under the constant condition of withdrawing rate and thermograde.Record cross section primary dendritic spacing 119.601 μ m, vertical section lamellar spacing 210.612 μ m.
Embodiment 2
Select alloying constituent (massfraction %) Cu4.5% compound rare-earth 0.4% for use, all the other are Al.Alloy is carried out directional freeze vacuum oriented the solidifying of 5kg crucible pull-down in the stove, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.Keeping under identical temperature of superheat and overheated time conditions, carrying out directional freeze under the constant condition of withdrawing rate and thermograde.Record cross section primary dendritic spacing 93.146 μ m, vertical section lamellar spacing 141.531 μ m.
Embodiment 3
Select alloying constituent (massfraction %) Cu4.5% compound rare-earth 0.5% for use, all the other are Al.Alloy is carried out directional freeze vacuum oriented the solidifying of 5kg crucible pull-down in the stove, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.Keeping under identical temperature of superheat and overheated time conditions, carrying out directional freeze under the constant condition of withdrawing rate and thermograde.Record cross section primary dendritic spacing 115.396 μ m, vertical section lamellar spacing 162.243 μ m.
Claims (3)
1. method that adds compound rare-earth control directional freeze primary dendritic spacing is characterized in that: alloying constituent, and massfraction %, Cu4.5%, compound rare-earth 0.1-0.5%, Ce50% wherein, La50%, all the other are Al; Alloy is carried out directional freeze vacuum oriented the solidifying of 5kg crucible pull-down in the stove, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.The placement of thermopair parallels with the crucible direction of heat flow at work, in the heating and cooling process, records temperature distribution with thermopair; In order to guarantee furnace temperature, keep water coolant steady temperature constant water pressure, the fixing distance between water coolant and the heating platform simultaneously, thermograde is constant when guaranteeing work; Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big, less than 100r/min, the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate; Come the controlled temperature gradient by controlling three sections dwell temperature; The present invention selects Al-4.5%Cu alloy middle-weight rare earths La for use, by the correlation parameter data of table 1, draws the internal relation of rare earth La and primary dendritic spacing.
Table 1 correlation parameter data
2. according to the described a kind of method that adds compound rare-earth control directional freeze primary dendritic spacing of claim 1,, record dendrite interval and see Table 2 by changing the add-on of compound rare-earth.
Table 2 adds the primary dendritic spacing and the lamellar spacing of the compound rare-earth of heterogeneity
3. according to the described a kind of method that adds compound rare-earth control directional freeze primary dendritic spacing of claim 2, the add-on of compound rare-earth can be preferably 0.4%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010508934 CN101956107A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendrite arm spacing of directional solidification by adding composite rare earth |
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| CN 201010508934 CN101956107A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendrite arm spacing of directional solidification by adding composite rare earth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794440A (en) * | 2012-09-08 | 2012-11-28 | 镇江忆诺唯记忆合金有限公司 | Compound rare earth additive for low-ferromanganese-based memory alloy |
| CN104372400A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for controlling aluminum-copper alloy directional solidification primary dendrite arm spacing by use of Ce |
-
2010
- 2010-10-15 CN CN 201010508934 patent/CN101956107A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 《中国博士学位论文全文数据库工程科技I辑》 20090915 刘海霞 工艺因素对Al-4.5％Cu合金定向凝固组织及性能的影响 第72页表6-5，第21页第3-4段，第45页第1段，第22页第1-2段，第52页第3段，第52-53页表5-1，第45页第2段，摘要，第73页第1段，第73页表表6-6 1-3 , 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794440A (en) * | 2012-09-08 | 2012-11-28 | 镇江忆诺唯记忆合金有限公司 | Compound rare earth additive for low-ferromanganese-based memory alloy |
| CN104372400A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for controlling aluminum-copper alloy directional solidification primary dendrite arm spacing by use of Ce |
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Open date: 20110126 |