CN102021455A - Method for controlling primary dendritic spacing of directional solidification by adding rare earth La - Google Patents
Method for controlling primary dendritic spacing of directional solidification by adding rare earth La Download PDFInfo
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- CN102021455A CN102021455A CN 201010508946 CN201010508946A CN102021455A CN 102021455 A CN102021455 A CN 102021455A CN 201010508946 CN201010508946 CN 201010508946 CN 201010508946 A CN201010508946 A CN 201010508946A CN 102021455 A CN102021455 A CN 102021455A
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Abstract
The invention discloses a method for controlling the primary dendritic spacing of directional solidification by adding rare earth La, which belongs to the technical field of directional solidification, and is characterized in that an alloy comprises the following components in percentage by mass: 4.5% of Cu, 0.1-0.5% of La and the balance Al. The alloy is subject to directional solidification in a 5kg-crucible pull-down vacuum directional solidification furnace, wherein the temperature is controlled by three groups of thermocouples mounted on a heating element, and the working temperature is controlled to +/-5 K. The crystal growth rate is controlled by controlling the pull-down rate of a motor; and when the withdrawal rate is less than 100r/min, the withdrawal rate of the motor can be approximately equal to the crystal growth rate. The temperature gradient is controlled by controlling the standing temperature of three sections. In the method for controlling the primary dendritic spacing, the rare earth La is added into the Al-4.5% Cu alloy, and the internal relation between the rare earth La and the primary dendritic spacing is obtained 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 rare earth La control directional freeze primary dendritic spacing.
Background technology
Metal solidification process is to be principal mode with the dendritic growth, and dendritic structure feature and freezing interface directly affect the performance of solidified structure and material.Wherein dendrite interval is solute in the decision alloy structure, the middle important solidified structure parameter that equates character.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 La 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 La control directional freeze primary dendritic spacing.
Summary of the invention
Purpose of the present invention provides a kind of method that adds rare earth La control directional freeze primary dendritic spacing.It is characterized in that: alloying constituent (massfraction %) Cu4.5% La0.1-0.5%, 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 La, by the correlation parameter data of table 1, draws the internal relation of rare earth La 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 La, record dendrite interval and see Table 2.
By table 2 as seen, the add-on of rare earth La can be preferably 0.3%
Table 2 adds the primary dendritic spacing and the lamellar spacing of the rare earth La of heterogeneity
| Numbering | Content of rare earth | Cross section primary dendritic spacing μ m | Vertical section lamellar spacing μ m |
| 01 | La0.1％ | 126.097 | 214.444 |
| 02 | La0.2％ | 119.601 | 196.667 |
| 03 | La0.3％ | 103.530 | 152.727 |
| 04 | La0.4％ | 116.126 | 212.376 |
| 05 | La0.5％ | 124.253 | 222.415 |
Embodiment
Embodiment 1
Select alloying constituent (massfraction %) Cu4.5%La0.1% 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 126.097 μ m, vertical section lamellar spacing 214.444 μ m.
Embodiment 2
Select alloying constituent (massfraction %) Cu4.5% La0.3% 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 103.530 μ m, vertical section lamellar spacing 152.727 μ m.
Embodiment 3
Select alloying constituent (massfraction %) Cu4.5% La0.5% 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 124.253 μ m, vertical section lamellar spacing 222.415 μ m.
Claims (3)
1. one kind adds the method that rare earth La is controlled the directional freeze primary dendritic spacing, it is characterized in that: alloying constituent (massfraction %) Cu4.5%La0.1-0.5%, 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 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 rare earth La control directional freeze primary dendritic spacing of claim 1,, record dendrite interval and see Table 2 by changing the add-on of rare earth La.
Table 2 adds the primary dendritic spacing and the lamellar spacing of the rare earth La of heterogeneity
3. according to the described a kind of method that adds cerium control directional freeze primary dendritic spacing of claim 2, the add-on of rare earth La can be preferably 0.3%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010508946 CN102021455A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendritic spacing of directional solidification by adding rare earth La |
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| CN 201010508946 CN102021455A (en) | 2010-10-15 | 2010-10-15 | Method for controlling primary dendritic spacing of directional solidification by adding rare earth La |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752808A (en) * | 2014-01-02 | 2014-04-30 | 西安交通大学 | Method for realizing casting variable withdrawing rate in directional solidification casting |
| 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 201010508946 patent/CN102021455A/en active Pending
Non-Patent Citations (3)
| 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 摘要，第21页第3-4段，第22页第1-2段，第45页1-2段，第52页第3段，第66-67页表6-1 1-3 , 第09期 2 * |
| 《中国有色金属学报》 20070430 司乃潮 等 熔体过热处理对Al-4.7%Cu合金定向凝固组织的影响 第547-553页 1-3 第17卷, 第4期 2 * |
| 《金属学报》 19951130 徐达鸣 等 变速生长条件下Al-Cu合金的定向凝固枝晶组织 第A501-A507页 1-3 第31卷, 第11期 2 * |
Cited By (3)
| 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 |
| CN103752808A (en) * | 2014-01-02 | 2014-04-30 | 西安交通大学 | Method for realizing casting variable withdrawing rate in directional solidification casting |
| CN103752808B (en) * | 2014-01-02 | 2015-07-01 | 西安交通大学 | Method for realizing casting variable withdrawing rate in directional solidification casting |
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Application publication date: 20110420 |