CN102059337A - Method for controlling orientation of TbxDy (1-x) Fe (1.75-1.95) alloy along easy magnetic axis by being solidified in magnetic field - Google Patents
Method for controlling orientation of TbxDy (1-x) Fe (1.75-1.95) alloy along easy magnetic axis by being solidified in magnetic field Download PDFInfo
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Abstract
The invention relates to a method for controlling the orientation of TbxDy (1-x) Fe (1.75-1.95) alloy along an easy magnetic axis by being solidified in a magnetic field, wherein x=0.24-0.33. The method is characterized in that: TbxDy (1-x) Fe (1.75-1.95) master alloy is heated to the temperature of 1,235-1,240 DEG C, and the temperature is maintained for more than 5 minutes; when the intensity of an applied static magnetic field is high, the alloy melt can be solidified at a relatively high solidification rate; when the intensity of the applied static magnetic field is low, the alloy melt can be solidified at a relatively low solidification rate; and thus nucleated grains in the magnetic field induced melt are orderly stacked parallel to the magnetic field direction along the easy magnetic axis, consequently the control of the crystal growth texture is realized. As the heating and solidification processes are carried out in a vacuum system with argon gas, the method has the characteristics of relatively low heating temperature, large intensity range of the applied magnetic field, and the like, and particularly the equipment cost of the method is greatly reduced under the magnetic field intensity of less than 2T.
Description
Technical field
The present invention relates to a kind of orientation control method of Metallic Functional Materials, specifically is Tb
xDy (
1-x) Fe (
1.75～1.95) (x=0.24～0.33) alloy obtains the texture controlling method that is orientated along easy magnetizing axis (promptly＜111 〉) through the magnetostatic field effect at process of setting.Belong to the Metallic Functional Materials technical field.
Background technology
Rare earth iron giant magnetostriction material Tb
xDy (
1-x) Fe (
1.75～1.95) (x=0.24～0.33) can realize the conversion of the signal of telecommunication and mechanical signal effectively.After 90 generations of last century, rare earth iron giant magnetostriction material has obtained the application of continuous expansion at military-civil industrial circle, begins to embody its excellent performance at aspects such as wing damping, various ultrasonic transducer, magnetic ()-mechanical actuator, intelligent sensing actuators.But rare earth iron giant magnetostriction material has the magnetostriction anisotropy.Along easy magnetizing axis＜111〉orientation can obtain best magnetostriction performance.But now at process of setting at Tb
0.3Dy
0.7Fe
1.9The technology of preparing of alloy and patent are serving as main directional solidification technique field of solidifying with unidirectional heat radiation mainly, use these technology can only produce both at home and abroad＜110 and＜112〉bar that is orientated.In laboratory, can produce the bar of short＜111〉orientation of minor diameter with the way of seed crystal, but this complex process, instability, and composition is uncontrollable, no industrial value.
Ferrimagnet is near the fusing point far above curie point, and remaining magnetocrystalline anisotropy is still existence, because in the system of magnetic field effect, crystal is parallel to magnetic field can realize that along the easy magnetizing axis orientation system's free energy is minimum, thereby the Tb in the process of setting
xDy (
1-x) Fe (
1.75～1.95) induce at magnetostatic field and can realize down being orientated along easy magnetizing axis (promptly＜111 〉) of forming core crystal grain.
It is the patent application of 200710099415.9 " a kind of rare-earth-iron giant magnetostrictive material and preparation method thereof " that application number is arranged at present, and this patent is attempted to increase a high-intensity magnetic field and realized Tb on the basis of directional solidification
0.3Dy
0.7Fe
1.9Alloy＜111〉orientation.In this patent, adopt the high-intensity magnetic field more than the 3T, carry out directional solidification in the drop-down speed of 20mm～400mm/h, wish to obtain＜111 orientation.This method is to finish in unidirectional heat radiation is main directional solidification process, promptly is set in material is pulled down to low-temperature space by the high-temperature region the process to finish, and application reference number is 200710099415.9 patent application again, and material is heated to the temperature far above fusing point.
Summary of the invention
The scheme of technical solution problem proposed by the invention be a kind of under the curing condition of non-unidirectional heat radiation Tb
xDy (
1-x) Fe (
1.75～1.95) alloy solidifies the control method of realization along easy magnetizing axis orientation in magnetic field.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of Tb
xDy (
1-x) Fe
(1.75～1.95)Alloy solidifies the control method of realization along the easy magnetizing axis orientation in magnetic field, it is characterized in that foundry alloy Tb
xDy (
1-x) Fe (
1.75～1.95) be heated to and be lower than melting temperature, not being higher than under 1240 ℃ of situations, insulation is more than 5 minutes, and the cooldown rate control process of setting of 0.4 ℃/min～100 ℃/min when applying static magnetic field strength greater than 2T, is adopted in x=0.24～0.33 wherein; When applying magnetostatic field 0.3-2T, adopt the cooldown rate control process of setting that 0.1 ℃/min～5 ℃/min is slower.In the process of solidifying, the heating power by reducing resistance wire rather than by lifting or drop-down alloy melt leaves the high-temperature region and realizes alloy graining, above-mentioned heating and being set in the vacuum system is carried out, or carries out in being filled with the vacuum system of argon gas.
Have and can adopt following three kinds:
First kind, comprise the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply more than the magnetostatic field 2T;
3. with the cooldown rate control process of setting of 0.4 ℃/min～100 ℃/min, until solidifying end.
Second kind, comprise the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply in magnetostatic field 0.8T～2T scope;
3. melt temperature evenly after, with the cooldown rate control process of setting of 0.2 ℃/min～5 ℃/min, until solidifying end.
The third comprises the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply in magnetostatic field 0.8T～2T scope;
3. melt temperature evenly after, with the cooldown rate control process of setting of 0.2 ℃/min～5 ℃/min, until solidifying end.
As preferably, described x=0.3 or x=0.27.
Compared with prior art, the invention has the advantages that: this patent is to finish under the condition that non-directional conducts heat, in process of setting material not by drop-down to finish unidirectional heat radiation, the alloy melt heat is environment conduction towards periphery equably, heating-up temperature is lower than material melting point, and whole heating and process of setting do not have the volatilization of obvious solute atoms; Characteristics such as the magnetic field intensity scope of utilization is big especially use the equipment cost that this patent will be used to descend greatly under the condition that is lower than the 3T magnetic field intensity.The powder metallurgic method that can substitute that operation is complicated, effect is not very desirable magnetic field preorientation.Melt texture control technology in the magnetic field is extended to the downfield field, and the use of low-intensity magnetic fields then greatly reduces the requirement of equipment and investment, requires the many-side of preparation of product to make technology more with practical value from equipment.As the Tb-Dy-Fe alloy, because very easily oxidation, its melting and process of setting can only carry out in vacuum system, and additional more low intensive magnetic field device is to be easy to fit together with vacuum system very much, and equipment cost is not high.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
Material: 1Tb
0.3Dy
0.7Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes, apply magnetostatic field, magnetic field intensity 0.7T; 6, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 2
Material: 1Tb
0.3Dy
0.7Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes, apply magnetostatic field, magnetic field intensity 1.8T; 6, after the melt temperature field is even, with the freezing rate control process of setting of 3 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 3
Material: 1Tb
0.3Dy
0.7Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, applied magnetostatic field, magnetic field intensity 8T in 30 minutes at this temperature hold-time; 3, after the melt temperature field is even, with the freezing rate control process of setting of 10 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 4
Material: 1Tb
0.3Dy
0.7Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃, apply magnetostatic field, magnetic field intensity 0.5T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 0.7 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 5
Material: 1Tb
0.3Dy
0.7Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃, apply magnetostatic field, magnetic field intensity 1.5T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 6
Material: 1Tb
0.3Dy
0.7Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃, apply magnetostatic field, magnetic field intensity 4T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 3 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.3Dy
0.7Fe
1.80Bar.
Embodiment 7
Material: 1Tb
0.27Dy
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃, this temperature hold-time 30 minutes, apply magnetostatic field, magnetic field intensity 0.3T; 6, after the melt temperature field is even, with the freezing rate control process of setting of 0.2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27y
0.73Fe
1.80Bar.
Embodiment 8
Material: 1Tb
0.27Dy
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃, this temperature hold-time 30 minutes, apply magnetostatic field, magnetic field intensity 1T; 6, after the melt temperature field is even, with the freezing rate control process of setting of 0.3 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27y
0.73Fe
1.80Bar.
Embodiment 9
Material: 1Tb
0.27y
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃, applied magnetostatic field, magnetic field intensity 3T in 30 minutes at this temperature hold-time; 3, after the melt temperature field is even, with the freezing rate control process of setting of 1 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27y
0.73Fe
1.80Bar.
Embodiment 10
Material: 1Tb
0.27Dy
0.73Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, apply magnetostatic field, magnetic field intensity 0.5T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27Dy
0.73e
1.90Bar.
Embodiment 11
Material: 1Tb
0.27Dy
0.73e
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, apply magnetostatic field, magnetic field intensity 1.5T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 1.5 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27Dy
0.73e
1.90Bar.
Embodiment 12
Material: 1Tb
0.27Dy
0.73e
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, apply magnetostatic field, magnetic field intensity 2.5T; This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation can obtain to be parallel to magnetic direction＜111〉be orientated dominant Tb
0.27Dy
0.73e
1.90Bar.
In above 12 embodiment, all can obtain Tb
xDy
(1-x)Fe
(1.75～195)(x=0.24～0.33) alloy be parallel to magnetic direction by easy axle＜111 crystal texture of orientation, microstructure flawless and micropore, the brilliant tissue of no Wei Shi body acupuncture shape precipitated phase and contraction (often appearing in the oriented freezing organization of this material, unfavorable) to the magnetostriction performance.
The contrast case:
Comparative Examples 1
Material: 1Tb
0.3Dy
0.7Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes; 6, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 2
Material: 1Tb
0.3y
0.70Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes; 6, after the melt temperature field is even, with the freezing rate control process of setting of 1 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.80Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 3
Material: 1Tb
0.3y
0.70Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.80Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 4
Material: 1Tb
0.3y
0.70Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃, this temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 5
Material: 1Tb
0.3y
0.70Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃, this temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 1 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 6
Material: 1Tb
0.3y
0.70Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1240 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1240 ℃,
This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.3y
0.70Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 7
Material: 1Tb
0.27Dy
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃, this temperature hold-time 30 minutes; 6, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73Fe
1.80Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 8
Material: 1Tb
0.27Dy
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃, this temperature hold-time 30 minutes; 6, after the melt temperature field is even, with the freezing rate control process of setting of 1 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73Fe
1.80Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 9
Material: 1Tb
0.27Dy
0.73Fe
1.802 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1237 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1237 ℃; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73Fe
1.80Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 10
Material: 1Tb
0.27Dy
0.73Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 0.8 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 11
Material: 1Tb
0.27Dy
0.73Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃, this temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 1 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73Fe
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Comparative Examples 12
Material: 1Tb
0.27Dy
0.73Fe
1.902 are put in material in the high-purity corundum pipe that internal diameter is 16mm, and 3, be evacuated to＜5 * 10-2Pa, applying argon gas is to 0.06-0.08MPa; 4, the heating foundry alloy slowly is warming up to 1239 ℃ with 1.5 ℃/minute during to 1150 ℃; 5, material temperature is remained on 1239 ℃,
This temperature hold-time 30 minutes; 3, after the melt temperature field is even, with the freezing rate control process of setting of 2 ℃/min; Until 1200 ℃ of material temperature.
Result of implementation only can obtain along Tb
0.27Dy
0.73e
1.90Bar is axial＜110 or＜113 etc. orientation or do not have the orientation tissue, do not have＜111〉orientation.
Solidifying in magnetostatic field in conjunction with necessary curing condition as can be known by the contrast case is to obtain Tb
0.3Dy
0.7Fe
1.90Bar is axially＜111〉correct method of orientation, and do not have the magnetostatic field effect, no matter under which kind of curing condition, all can not obtain＜111〉orientation.
Claims (5)
1. Tb
xDy
(1-x)Fe
(1.75～1.95)Alloy solidifies the control method of realization along the easy magnetizing axis orientation in magnetic field, wherein x=0.24～0.33 is characterized in that foundry alloy Tb
xDy (
1-x) Fe (
1.75～1.95) be heated under 1235～1240 ℃ of situations, insulation is more than 5 minutes, when applying static magnetic field strength greater than 2T, adopts the cooldown rate control process of setting of 0.4 ℃/min～100 ℃/min; When applying magnetostatic field 0.3～2T, adopt the cooldown rate control process of setting that 0.1 ℃/min～5 ℃/min is slower, above-mentioned heating and being set in the vacuum system is carried out, or carries out in being filled with the vacuum system of argon gas.
2. control method according to claim 1 is characterized in that comprising the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply more than the magnetostatic field 2T;
3. with the cooldown rate control process of setting of 0.4 ℃/min～100 ℃/min, until solidifying end.
3. control method according to claim 1 is characterized in that comprising the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply in magnetostatic field 0.8T～2T scope;
3. melt temperature evenly after, with the cooldown rate control process of setting of 0.2 ℃/min～5 ℃/min, until solidifying end.
4. control method according to claim 1 is characterized in that comprising the steps
1. heat foundry alloy, after temperature surpasses 1100 ℃, slowly heat up with speed less than 5 ℃/min;
2. in foundry alloy is heated to 1235～1240 ℃ temperature range, be incubated 5 fens more than the clock time, apply in magnetostatic field 0.3T～0.8T scope;
3. melt temperature evenly after, with the cooldown rate control process of setting of 0.1 ℃/min～3 ℃/min, until solidifying end.
5. according to the described control method of arbitrary claim in the claim 1～4, it is characterized in that described x=0.3 or x=0.27.
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