CN102303111A - Melt overheating treatment temperature for thinning aluminum-copper alloy directional solidification structure - Google Patents
Melt overheating treatment temperature for thinning aluminum-copper alloy directional solidification structure Download PDFInfo
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- CN102303111A CN102303111A CN201110280512A CN201110280512A CN102303111A CN 102303111 A CN102303111 A CN 102303111A CN 201110280512 A CN201110280512 A CN 201110280512A CN 201110280512 A CN201110280512 A CN 201110280512A CN 102303111 A CN102303111 A CN 102303111A
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Abstract
The invention relates to a melt overheating treatment temperature for thinning an aluminum-copper alloy directional solidification structure, and belongs to the technical field of directional solidification and aluminum alloy. The melt overheating treatment temperature is characterized in that: electrolytic aluminum with purity of 99.99 percent and electrolytic copper with purity of 99.99 percent are melted into Al-4.7 percent Cu alloy as required, and then a directional solidification test sample is prepared in a quick solidification process directional solidification furnace. For observing the influence of the melt overheating treatment temperature on the directional solidification structure under the condition of the same process factors such as temperature gradient, solidification rate and the like, massive experiment and exploration are needed; and by determining the directional solidification temperature T0 and the solidification rate V0 and selecting the melt overheating treatment temperature Ts, the same process factors such as the front edge temperature gradient of a liquid-solid interface, solidification rate and the like are ensured. The selected T0 is 750 DEG C, the V0 is 90mum/s, the ts is 60 minutes, and the melt overheating treatment temperature Ts is respectively 850 DEG C, 950 DEG C and 1,050 DEG C.
Description
Technical field
The invention belongs to directional solidification and aluminium alloy technical field, refer in particular to a kind of Melt Overheating Treatment temperature of refinement aluminium copper oriented freezing organization.
Background technology
The performance of unidirectional solidification material depends on characteristic lengths such as primary dendritic spacing to a great extent, and in recent years, many scholars have carried out big quantity research to the directional solidification dendritic growth.On the basis that solid liquid interface micro unit heat balance is analyzed, set up the theoretical model of crystal orientation to the primary dendritic spacing influence.This model shows that one dimension preferential crystallographic orientation is far away more with macroscopical directional solidification deviation in driction, and primary dendritic spacing is more little.Experimental studies results to single crystal super alloy solidified structure yardstick shows, crystal orientation to primary dendritic spacing influence trend and theoretical model matches, its influence degree is relevant with temperature gradient of solid-liquid interface and directional solidification rates.Model and experiment all show, improve temperature gradient of solid-liquid interface and directional solidification rates, and crystal orientation weakens the influence degree of primary dendritic spacing.
The Melt Overheating Treatment temperature has appreciable impact to oriented freezing organization.Someone has studied the influence of Melt Overheating Treatment temperature to the nickel-base high-temperature single crystal alloy solidified structure; Result of the test shows; Along with the increase of melt treatment temperature, to the brilliant transformation of withe, primary dendritic spacing reduces the solidified structure of alloy gradually from thick dendrite; And reduce suddenly 1700 ℃ of generations, the critical-temperature that alloy is described is about 1700 ℃; Dendrite is done, the size of interdendritic γ ' all reduces, and shape is rule more, and dendrite is done, interdendritic γ ' size difference reduces, and the dendritic segregation ratio levels off to 1, and this mainly is because the result of melt treatment temperature change melt structure.Along with the rising of melt temperature, the main peak height of alloy melt structure factor curve and symmetry reduce; It is level and smooth that secondary peak becomes.The increase of alloy melt along with overtemperature is described, atom group and various associative key in the melt are destroyed, and it is more even that melt becomes, and the degree of order reduces.The present invention develops a kind of melt overheat temperature of refinement aluminium copper oriented freezing organization.
Summary of the invention
The objective of the invention is to develop a kind of Melt Overheating Treatment temperature of refinement aluminium copper oriented freezing organization; It is characterized by; Being 99.99% electrolytic aluminium with purity earlier is made into the Al-4.7%Cu alloy with 99.99% the cathode copper fractional melting that becomes on request, then preparation directional solidification sample in the rapid solidification method directional solidification furnace.For under the identical condition of technological factors such as thermograde, freezing rate, observing the Melt Overheating Treatment temperature oriented freezing organization is influenced, must explore, confirm the directional solidification temperature T through lot of test
0And freezing rate V
0, selected again Melt Overheating Treatment temperature T
s, in each process of the test, all be to be heated to T
sAnd insulation t
sAfter be cooled to T rapidly
0Temperature is at identical freezing rate V
0Under carry out directional solidification, identical to guarantee technological factors such as liquid-solid boundary temp gradient at front edge, freezing rate.The present invention selectes T
0=750 ℃, V
0=90 μ m/s, t
s=60min, the Overheating Treatment temperature T of melt
sBe respectively 850 ℃, 950 ℃ and 1050 ℃.
The sample that directional solidification sample intercepted length on the position of stable growth 50mm is about 20mm; Process along two blocks of metallographic specimens of cross section and longitudinal section; On horizontal light microscope, carry out structure observation and photograph; Adopt the quantitative metallographic analysis appearance to measure spacing of dendrite, measure the mechanical property of Al-4.7Cu directional solidification sample under the treatment of different temperature condition with electronic universal tester.
Fig. 1 is at T
0=750 ℃, V
0=90 μ m/s, t
sUnder=60min the condition, the Al-4.7Cu alloy is at T
s=850～1050 ℃ of scope interior orientation setting test results.The result shows, along with the Melt Overheating Treatment temperature T
sRaising, the solidified structure of Al-4.7%Cu alloy changes alloy primary dendritic spacing λ from thick dendrite to withe is brilliant
1Reduce, promptly organize more and more finer and closely wovenly, and reduce the amplitude aggravation at 850～950 ℃.In the Al-Cu of Overheating Treatment alloy melt; Because melt overheat; Cause diminishing of irreversible type of solid type elementide fusing and atom group average dimension; Melt structure changes, thereby causes that the heterogeneous nucleation centric quantity reduces and the forming core degree of supercooling increases, and the homogeneous nucleation growth course progressively is dominant.And along with the Melt Overheating Treatment temperature T
sRaising, primary tiller crystals growth direction becomes straight gradually by deflection.Primary dendritic spacing through 850 ℃ and 1050 ℃ Overheating Treatment compares the 19.8%-36.2% that reduced 750 ℃ of no overheated direct directional solidifications.Visible by table 1, tensile strength sigma
b/ MPa has compared in the raising of 750 ℃ of no overheated direct directional solidifications 7.3%-28.8%, and percentage elongation δ/% has compared in the raising of 750 ℃ of no overheated direct directional solidifications 34.1%-38.6%.Obviously, the Melt Overheating Treatment temperature has appreciable impact to the directional solidification primary dendritic spacing, can the refinement oriented freezing organization, improve mechanical property, and this mainly is because Melt Overheating Treatment has changed the configuration state of melt.The Melt Overheating Treatment temperature is greater than after 1050 ℃, and the Al-4.7%Cu alloy is incompatible, so the Al-4.7%Cu alloy is when carrying out directional solidification, and the Melt Overheating Treatment temperature is not more than 1050 ℃.Its metallographic structure and mechanical property are seen Fig. 1 and table 1.
Description of drawings
Fig. 1 melt overheat temperature T
sInfluence to the Al-4.7Cu oriented freezing organization
(a) T
s=750 ℃ (no overheated), λ
1=230.9 μ m; (b) T
s=850 ℃, λ
1=185.2 μ m;
(c)T
s＝950℃，λ
1＝158.9μm；(d)T
s＝1050℃，λ
1＝147.4μm
The specific embodiment
Embodiment 1
Being 99.99% electrolytic aluminium with purity earlier is made into the Al-4.7%Cu alloy with 99.99% the cathode copper fractional melting that becomes on request, then preparation directional solidification sample in the rapid solidification method directional solidification furnace.For under the identical condition of technological factors such as thermograde, freezing rate, observing the Melt Overheating Treatment temperature oriented freezing organization is influenced, must explore, confirm the directional solidification temperature T through lot of test
0And freezing rate V
0, selected again Melt Overheating Treatment temperature T
s, in each process of the test, all be to be heated to T
sAnd insulation t
sAfter be cooled to T rapidly
0Temperature is at identical freezing rate V
0Under carry out directional solidification, identical to guarantee technological factors such as liquid-solid boundary temp gradient at front edge, freezing rate.The present invention selectes T
0=750 ℃, V
0=90 μ m/s, t
s=60min, the Overheating Treatment temperature T of melt
s850 ℃.Its metallographic structure and mechanical property are seen Fig. 1 and table 1.Through the primary dendritic spacing of 850 ℃ of overtemperatures than having reduced 19.8% 750 ℃ of no overheated direct directional solidifications.Tensile strength sigma
b/ MPa has compared in the raising of 750 ℃ of no overheated direct directional solidifications 7.3%, and percentage elongation 6/% has compared in the raising of 750 ℃ of no overheated direct directional solidifications 34.1%.
Embodiment 2
Being 99.99% electrolytic aluminium with purity earlier is made into the Al-4.7%Cu alloy with 99.99% the cathode copper fractional melting that becomes on request, then preparation directional solidification sample in the rapid solidification method directional solidification furnace.For under the identical condition of technological factors such as thermograde, freezing rate, observing the Melt Overheating Treatment temperature oriented freezing organization is influenced, must explore, confirm the directional solidification temperature T through lot of test
0And freezing rate V
0, selected again Melt Overheating Treatment temperature T
s, in each process of the test, all be to be heated to T
sAnd insulation t
sAfter be cooled to T rapidly
0Temperature is at identical freezing rate V
0Under carry out directional solidification, identical to guarantee technological factors such as liquid-solid boundary temp gradient at front edge, freezing rate.The present invention selectes T
0=750 ℃, V
0=90 μ m/s, t
s=60min, the Overheating Treatment temperature T of melt
s950 ℃.Its metallographic structure and mechanical property are seen Fig. 1 and table 1.Through the primary dendritic spacing of 950 ℃ of overtemperatures than having reduced 31.2% 750 ℃ of no overheated direct directional solidifications.Tensile strength sigma
b/ MPa has compared in the raising of 750 ℃ of no overheated direct directional solidifications 11.7%, and percentage elongation δ/% has compared in the raising of 750 ℃ of no overheated direct directional solidifications 34.8%.
Embodiment 3
Being 99.99% electrolytic aluminium with purity earlier is made into the A1-4.7%Cu alloy with 99.99% the cathode copper fractional melting that becomes on request, then preparation directional solidification sample in the rapid solidification method directional solidification furnace.For under the identical condition of technological factors such as thermograde, freezing rate, observing the Melt Overheating Treatment temperature oriented freezing organization is influenced, must explore, confirm the directional solidification temperature T through lot of test
0And freezing rate V
0, selected again Melt Overheating Treatment temperature T
s, in each process of the test, all be to be heated to T
sAnd insulation t
sAfter be cooled to T rapidly
0Temperature is at identical freezing rate V
0Under carry out directional solidification, identical to guarantee technological factors such as liquid-solid boundary temp gradient at front edge, freezing rate.The present invention selectes T
0=750 ℃, V
0=90 μ m/s, t
s=60min, the Overheating Treatment temperature T of melt
s950 ℃.Its metallographic structure and mechanical property are seen Fig. 1 and table 1.Through the primary dendritic spacing of 1050 ℃ of overtemperatures than having reduced 36.2% 750 ℃ of no overheated direct directional solidifications.Tensile strength sigma
b/ MPa has compared in the raising of 750 ℃ of no overheated direct directional solidifications 28.8%%, and percentage elongation δ/% has compared in the raising of 750 ℃ of no overheated direct directional solidifications 38.6%.
Table 1Al-4.7%Cu alloy primary dendritic spacing and mechanical property
Claims (2)
1. the Melt Overheating Treatment temperature of a refinement aluminium copper oriented freezing organization; It is characterized by; Being 99.99% electrolytic aluminium with purity earlier is made into the Al-4.7%Cu alloy with 99.99% the cathode copper fractional melting that becomes on request, then preparation directional solidification sample in the rapid solidification method directional solidification furnace; For under the identical condition of technological factors such as thermograde, freezing rate, observing the Melt Overheating Treatment temperature oriented freezing organization is influenced, must explore, confirm the directional solidification temperature T through lot of test
0And freezing rate V
0, the Overheating Treatment temperature T of selected again melt
s, identical to guarantee technological factors such as liquid-solid boundary temp gradient at front edge, freezing rate; The present invention selectes T
0=750 ℃, V
0=90 μ m/s, t
s=60min, the Overheating Treatment temperature T of melt
sBe respectively 850 ℃, 950 ℃ and 1050 ℃.
2. according to the Melt Overheating Treatment temperature of the said a kind of refinement aluminium copper oriented freezing organization of claim 1, the Overheating Treatment temperature T of melt
sWhen being respectively 850 ℃, 950 ℃ and 1050 ℃, primary dendritic spacing is than the 19.8%-36.2% that reduced 750 ℃ of no overheated direct directional solidifications, tensile strength sigma
b/ MPa has compared in the raising of 750 ℃ of no overheated direct directional solidifications 7.3%-28.8%, and percentage elongation δ/% has compared in the raising of 750 ℃ of no overheated direct directional solidifications 34.1%-38.6%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817607A (en) * | 2016-05-30 | 2016-08-03 | 合肥工业大学 | Method for raising combination intensity of liquid and solid compound interface of aluminum/copper double metal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994150A (en) * | 2010-10-15 | 2011-03-30 | 镇江忆诺唯记忆合金有限公司 | Method for deciding directional solidification primary dendrite arm spacing by controlling temperature gradient |
| CN102021456A (en) * | 2010-10-15 | 2011-04-20 | 镇江忆诺唯记忆合金有限公司 | Method for determining directional solidification of once dendritic crystal spacing by controlling crystal growth rate |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994150A (en) * | 2010-10-15 | 2011-03-30 | 镇江忆诺唯记忆合金有限公司 | Method for deciding directional solidification primary dendrite arm spacing by controlling temperature gradient |
| CN102021456A (en) * | 2010-10-15 | 2011-04-20 | 镇江忆诺唯记忆合金有限公司 | Method for determining directional solidification of once dendritic crystal spacing by controlling crystal growth rate |
Non-Patent Citations (3)
| Title |
|---|
| 司乃潮等: "熔体过热处理对Al-4.7%Cu合金定向凝固力学性能及晶体取向的影响", 《铸造》 * |
| 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", 《中国有色金属学报》 * |
| 孙克庆: "熔体过热处理对Al-Cu合金熔体结构和定向凝固组织、性能的影响", 《中国优秀硕士学位论文全文数据库工程科技I辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817607A (en) * | 2016-05-30 | 2016-08-03 | 合肥工业大学 | Method for raising combination intensity of liquid and solid compound interface of aluminum/copper double metal |
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Application publication date: 20120104 |