CN1114691A - Aluminium-lithium alloy electric field homogenizing treating method - Google Patents
Aluminium-lithium alloy electric field homogenizing treating method Download PDFInfo
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- CN1114691A CN1114691A CN 94110374 CN94110374A CN1114691A CN 1114691 A CN1114691 A CN 1114691A CN 94110374 CN94110374 CN 94110374 CN 94110374 A CN94110374 A CN 94110374A CN 1114691 A CN1114691 A CN 1114691A
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Abstract
The present invention discloses a method for uniformization treatment of alumino-lithium alloy in electric field. Firstly its body stock is used as positive pole, and is placed in a strong field action device, then the strong field generator is powered, and a high-voltage strong electric field is produced between the body stock and polar plate, and then the body stock is heated and uniformized for 8-16 h. at 430-540 deg.C, and then the body stock is subjected to non-field uniformization treatment for 8-16 h.. Said invention can be used for uniformization treatment of alumino-lithium alloy material.
Description
The present invention relates to metal heat treatmet, particularly the Al-Li alloy electric field homogenizing treating method.
There is serious dendritic segregation in casting alloy, and for the dendritic segregation of eliminating alloy improves the processing characteristics and the mechanical property of alloy, the homogenizing process of alloy is requisite thermal treatment means.The homogenizing process is an atomic diffusion process, and it is relevant with segregation scale, dendrite between centers and spread coefficient, and for slow refrigerative alloy, because dendrite interval is bigger, alloy almost can not homogenizing.Improve temperature, increase spread coefficient, can quicken the homogenizing process.Bi Di and Ke Kadi are in 371 pages of " metallurgical journal " 1971 the 2nd phases, and special the attention handled in the above homogenizing of segregation alloy melting point temperature, and its effect is fine.But, be easy to burning for Al-Li alloy.Reduce dendrite interval and can shorten homogenization time effectively.The ingot casting distortion reduces the transverse section, can shorten dendrite between centers, and distortion back homogenization time obviously shortens.But some casting Al-Li alloys are under as cast condition, and plasticity is relatively poor, almost can not process (01420 Al-Li alloy).Now conventional homogenization method can not solve the homogenizing problem of alloy effectively, and homogenization time is long, and blank center uniformization effect is relatively poor.So, the present method that does not also solve Al-Li alloy homogenizing problem effectively.
In view of the deficiency that prior art exists, it is long to the purpose of this invention is to provide solution Al-Li alloy homogenization time, the relatively poor electric field homogenizing treating method of the inner uniformization effect of alloy.
For achieving the above object, the present invention realizes by the following technical solutions.
Elder generation as positive pole, puts into the highfield acting device with stock, opens the highfield producer then, and strength of electric field can reach 1-10KV/cm, and the heating blank carries out homogenizing to be handled.Temperature is 430-550 ℃, and time 8-16 hour, the non-electric field homogenizing of carrying out again 8-16 hour was handled.
Al-Li alloy homogenizing process is the diffusion process of atom, the velocity of diffusion of the size decision atom of diffusion activation energy.Diffusion activation energy is relevant with the bound energy of alloy, and bound energy is weak more, and diffusion activation energy is more little, and atomic diffusion is fast more, and homogenization time is short more.The minimizing of alloy bound energy under the highfield effect is to realize by the effect that highfield weakens metallic bond.According to the free-electron theory of metal, unbound electron is distributed among the metal randomly, forms metallic bond.Under the effect of highfield (blank is anodal), the electron density of blank inside reduces, and the Fermi energy of alloy reduces, and melts combine can descend, and the intensity of activation of atomic diffusion reduces, and highfield quickens atomic diffusion, and homogenization time shortens.In addition, highfield reduces the surface energy of blank, and solute atoms is to surface diffusion, and the highfield effect has the directed characteristics of diffusion at a high speed, has eliminated the shortcoming of the inner uniformization effect difference of blank.
The present invention compared with prior art has following advantage:
1, shortened the Al-Li alloy homogenizing treatment time, the time can shorten more than 1/3rd, inner homogenizing quality improvement.
2, processing characteristics is obviously improved, and mechanical property also improves.2091 Al-Li alloy cold rolling reductions reach 90%, yield strength (T6) reaches 400MPa, disconnected strong intensity reaches 490MPa, the yield strength of strain aging reaches 497MPa, disconnected strong intensity reaches 544MPa, and 01420 Al-Li alloy processing characteristics is obviously improved, and hot rolling is ftractureed hardly, cold rolling reduction reaches more than 40%, and its performance reaches or be better than the index of general homogenizing processing.
Below in conjunction with accompanying drawing the present invention is described in detail.
Fig. 1 is the electric field homogenizing treating method setting drawing of Al-Li alloy of the present invention.
As can be seen from Figure 1, the electric field homogenizer of the present invention's employing is made up of three parts: First is the highfield generator, and purpose is in order to produce high-voltage dc voltage. The worker When doing, at first be three-phase alternating current 1, through pressure regulator 2, pass through again step-up transformer 3 have obtained the three-phase alternating current high voltage. Three-phase electricity is through high voltage silicon rectifier stack rectification 4 and high-tension electricity Capacitor filter 5 obtains the littler dc high voltage of pulsing, and its dc voltage value can be used high pressure Electrometer 6 is measured. Second portion is body of heater 7, in order to guarantee body of heater and electric field action The insulation of device, furnace lining has been inlayed one deck refractory ceramics 8, and the effect of this part is The heating blank, temperature range is 430-540 ℃, time 8-16 hour, also Can proceed 8-16 hour non-electric field homogenising processes.
Third part is electric field action device, and it is by blank one positive pole 9, pole plate-negative pole 11 and insulating ceramics 10 form. Its effect is to make blank be in the effect of highfield Lower, and blank, pole plate and body of heater mutual insulating. Between blank and pole plate, produce high Pressure electric field, electric-field intensity are 1-10kv/cm.
The invention provides following examples:
Embodiment 1:
2091 Al-Li alloys as positive pole, are put into the highfield acting device, open the highfield producer, produce the High Voltage electric field between blank and pole plate, strength of electric field is adjusted to 2kv/cm, temperature is 540 ℃, time is 8 hours, handles 8 hours through non-electric field again.Pole plate can adopt the high temperature oxidation resisting stainless steel plate.
Embodiment 2:
01420 Al-Li alloy as positive pole, is put into the highfield acting device, open the highfield producer, produce the High Voltage electric field between blank and pole plate, strength of electric field is adjusted to 10kv/cm, temperature is 430 ℃, time is 16 hours, carries out non-electric field again and handles 8 hours.Pole plate can adopt the high temperature oxidation resisting stainless-steel sheet.
Claims (1)
1, a kind of electric field homogenizing treating method of Al-Li alloy, it is characterized in that: earlier with blank as positive pole, put into the highfield acting device, open the highfield producer then, between blank and pole plate, produce the High Voltage electric field, strength of electric field is 1-10kv/cm, the reheat blank carries out homogenizing to be handled, and temperature is 430-540 ℃, 8-16 hours time, at last, carrying out 8-16 hours non-electric field homogenizing again handles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94110374A CN1039836C (en) | 1994-07-06 | 1994-07-06 | Aluminium-lithium alloy electric field homogenizing treating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94110374A CN1039836C (en) | 1994-07-06 | 1994-07-06 | Aluminium-lithium alloy electric field homogenizing treating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1114691A true CN1114691A (en) | 1996-01-10 |
| CN1039836C CN1039836C (en) | 1998-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94110374A Expired - Fee Related CN1039836C (en) | 1994-07-06 | 1994-07-06 | Aluminium-lithium alloy electric field homogenizing treating method |
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| Country | Link |
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| CN (1) | CN1039836C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404408A (en) * | 2014-12-03 | 2015-03-11 | 东北大学 | Current homogenizing device and current homogenizing method of aluminum alloy |
| CN106498141A (en) * | 2016-12-30 | 2017-03-15 | 哈尔滨工业大学 | A kind of sheet material handler for electric field heat treatment |
-
1994
- 1994-07-06 CN CN94110374A patent/CN1039836C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404408A (en) * | 2014-12-03 | 2015-03-11 | 东北大学 | Current homogenizing device and current homogenizing method of aluminum alloy |
| CN106498141A (en) * | 2016-12-30 | 2017-03-15 | 哈尔滨工业大学 | A kind of sheet material handler for electric field heat treatment |
| CN106498141B (en) * | 2016-12-30 | 2018-07-03 | 哈尔滨工业大学 | A kind of plank handler for electric field heat treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1039836C (en) | 1998-09-16 |
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