CN101956108A - Method for controlling primary dendritic spacing during directional solidification by adding rare earth Ce - Google Patents
Method for controlling primary dendritic spacing during directional solidification by adding rare earth Ce Download PDFInfo
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- CN101956108A CN101956108A CN 201010508956 CN201010508956A CN101956108A CN 101956108 A CN101956108 A CN 101956108A CN 201010508956 CN201010508956 CN 201010508956 CN 201010508956 A CN201010508956 A CN 201010508956A CN 101956108 A CN101956108 A CN 101956108A
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Abstract
The invention discloses a method for controlling primary dendritic spacing during directional solidification by adding rare earth Ce, and belongs to the technical field of directional solidification. The method is characterized in that the alloy comprises the following components in percentage by mass: 4.5 percent of Cu, 0.1 to 0.5 percent of Ce and the balance of Al. The alloy is directionally solidified in a 5kg crucible-dropdown vacuum directional solidification furnace, and the temperature is controlled by three groups of thermocouples arranged in a heating element, and is controlled to be +/-5K during work; the growth rate of crystals is controlled by controlling the dropdown rate of a motor, and when the drawing rate is not very large (less than 100r/min), the drawing rate of the motor can be approximate to the growth rate of the crystals; and the temperature gradient is controlled by controlling three sections of standing temperature. The rare earth Ce is added into the Cu alloy with 4.5 percent of Al, and an internal relation between the rare earth Ce and the primary dendritic spacing is obtained through related parameter data.
Description
Technical field
The invention belongs to the directional solidification technique field, refer in particular to a kind of method that adds Rare-Earth Ce 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 Rare-Earth Ce 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 Rare-Earth Ce control directional freeze primary dendritic spacing.
Summary of the invention
Purpose of the present invention provides a kind of method that adds Rare-Earth Ce 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: alloying constituent (massfraction %) Cu4.5%Ce0.1-0.5%, 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) 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 Rare-Earth Ce, by the correlation parameter data of table 1, draws the internal relation of Rare-Earth Ce 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 Rare-Earth Ce, record dendrite interval and see Table 2.
By table 2 as seen, the add-on of Rare-Earth Ce can be preferably 0.3%
Table 2 adds the primary dendritic spacing and the lamellar spacing of the Rare-Earth Ce of heterogeneity
| Numbering | Content of rare earth | Cross section primary dendritic spacing μ m | Vertical section lamellar spacing μ m |
| 01 | Ce0.1％ | 126.625 | 211.714 |
| 02 | Ce0.2％ | 115.139 | 186.667 |
| 03 | Ce0.3％ | 104.332 | 156.756 |
| 04 | Ce0.4％ | 114.808 | 201.832 |
| 05 | Ce0.5％ | 121.146 | 224.235 |
Embodiment
Embodiment 1
Select alloying constituent (massfraction %) Cu4.5%Ce0.1% 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 126.625 μ m, vertical section lamellar spacing 211.714 μ m.
Embodiment 2
Select alloying constituent (massfraction %) Cu4.5%Ce0.3% 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 104.332 μ m, vertical section lamellar spacing 156.756 μ m.
Embodiment 3
Select alloying constituent (massfraction %) Cu4.5%Ce0.5% 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 121.146 μ m, vertical section lamellar spacing 224.235 μ m.
Claims (3)
1. one kind adds the method that Rare-Earth Ce is controlled the directional freeze primary dendritic spacing, it is characterized in that: alloying constituent (massfraction %) Cu4.5%Ce0.1-0.5%, and 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) 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 Rare-Earth Ce, by the correlation parameter data of table 1, draws the internal relation of rare-earth element cerium and primary dendritic spacing.
Table 1 correlation parameter data
2. according to the described a kind of method that adds Rare-Earth Ce control directional freeze primary dendritic spacing of claim 1,, record dendrite interval and see Table 2 by changing the add-on of Rare-Earth Ce.
Table 2 adds the primary dendritic spacing and the lamellar spacing of the Rare-Earth Ce of heterogeneity
3. according to the described a kind of method that adds Rare-Earth Ce control directional freeze primary dendritic spacing of claim 2, the add-on of Rare-Earth Ce can be preferably 0.3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010508956 CN101956108A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendritic spacing during directional solidification by adding rare earth Ce |
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| CN 201010508956 CN101956108A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendritic spacing during directional solidification by adding rare earth Ce |
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| CN101956108A true CN101956108A (en) | 2011-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2010
- 2010-10-15 CN CN 201010508956 patent/CN101956108A/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 21，22，45，52，53，69 1-3 , 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Application publication date: 20110126 |