CN105238961A - 6XXX aluminum alloy and machining method thereof - Google Patents
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Abstract
The invention relates to a 6XXX aluminum alloy and a machining method thereof. The alloy comprises the following components: 0.7-1.3 wt% of Mg, 0.7-1.3 wt% of Si, 0.5-1.2 wt% of Cu, Mn not more than 0.10 wt%, Cr not more than 0.10 wt%, Zr not more than 0.10 wt%, Ti not more than 0.10 wt%, Zn not more than 0.50 wt%, Fe not more than 0.20 wt%, and the balance of Al and inevitable impurities. The machining process of the aluminum alloy comprises the following steps: firstly, a cast rod is cast, is uniformly heated from room temperature to 500-540 DEG C with the heating speed of 20-300 DEG C/h for keeping 10-20 hours, is heated to 545-570 DEG C with the speed of 10-100 DEG C/h for keeping 6-30 hours, and is quickly cooled; the material is extruded after preheating, is cooled in water online, is quenched, and is straightened; and finally, the artificial aging is performed. As the content of elements in the 6XXX aluminum alloy is reasonably adjusted, the material both has higher strength and better anodic oxidization effect; and the alloy material is an ideal material for manufacturing an outer part of an electronic product, and is broad in market application prospect.
Description
Technical field
The present invention relates to a kind of 6XXX line aluminium alloy, particularly relate to a kind of electronic product appearance component high strength alumin ium alloy and working method thereof, belong to non-ferrous metal technical field.
Background technology
6XXX line aluminium alloy (as 6063,6061), owing to having the characteristics such as lightweight, thermal diffusivity is good, anodic oxidation is functional, is thus widely used in the manufacture of electronic product components.Wherein, although the yield strength of 6063 aluminium alloys (~ 220MPa) is lower than the yield strength (~ 280MPa) of 6061, the former anodic oxidation performance is better than the anodic oxidation performance of the latter.Thus 6063 alloys are applied in the manufacture of the harsher high-end electronic product component of antianode oxidation effectiveness requirement.
Intensity and the anodic oxidation performance of material determined by alloying constituent, but prior art (as, CN103131904A, US4589932, US20140017116) often focus on the intensity being improved material by composition adjustment, and ignore the impact of composition antianode oxidation susceptibility, thus there is limitation.
For expanding the range of application (in requiring that higher electronic unit manufactures as being applied to strength property) of 6063 aluminium alloys, be necessary to develop new alloy, the strength property of material is made to be greater than 6063 aluminium alloys, and anodic oxidation performance is consistent with 6063 aluminium alloys, to meet the needs of the electronics applications of development.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of 6XXX line aluminium alloy and working method thereof are provided.Object of the present invention is achieved through the following technical solutions:
A kind of 6XXX line aluminium alloy, its composition and mass percentage are: Si:0.7 ~ 1.3wt%, Mg:0.7 ~ 1.3wt%, Cu:0.5 ~ 1.2wt%, Mn≤0.10wt%, Cr≤0.10wt%, Ti≤0.10wt%, Zr≤0.10wt%, Zn≤0.50wt%, Fe≤0.20wt%, and all the other components are Al and inevitable impurity.Wherein, Mn+Cr≤0.15wt%, or, Mn+Cr≤0.10wt%; Zr≤0.05wt%, or, Zr≤0.01wt%.
The working method of aforementioned 6XXX line aluminium alloy is:
1. semicontinuous casting rod: according to alloy proportion, by direct chill casting casting rod;
2. homogenizing thermal treatment: rise to 500 ~ 540 DEG C with the temperature rise rate of 20 ~ 300 DEG C/h from room temperature, and be incubated 10 ~ 20 hours; Be raised to 545 ~ 570 DEG C with the speed of 10 ~ 100 DEG C/h again, and be incubated 6 ~ 30 hours;
3. cool fast: rate of cooling >=100 DEG C/h;
4. extrude after the alloy material preheating obtained, the Heating temperature of extrusion ingot is 490 ~ 540 DEG C, and container temperature is 440 ~ 510 DEG C, and die temperature is 460 ~ 520 DEG C, and extrusion stem speed is 0.5 ~ 6mm/s, squeeze wood temperature out >=530 DEG C;
5. online cold quenching+aligning, finally carries out artificial aging.
Preferably, described step 3. in the middle of, rate of cooling >=150 DEG C/h.
Preferably, described step 4. in the middle of, squeeze wood temperature out >=540 DEG C.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:
(1) the present invention passes through the content of main alloying element Mg, Si, Cu and trace element in Reasonable adjustment 6XXX line aluminium alloy, is ensureing also have preferably anodic oxidation performance while material has higher-strength;
(2) 6XXX line aluminium alloy material of the present invention is the ideal material manufacturing use for electronic products appearance component, and market application foreground is wide.
Embodiment
The present invention is optimized by alloying constituent and the improvement of technique, overcomes the limitation of prior art, proposes a kind ofly comprehensively to improve the mechanical property of aluminum alloy materials and the 6XXX line aluminium alloy of anodic oxidation performance and working method thereof.The present inventor is according to many experiments and creationary thinking, obtain the component content of following preferred 6XXX line aluminium alloy: Si:0.7 ~ 1.3wt%, Mg:0.7 ~ 1.3wt%, Cu:0.5 ~ 1.2wt%, Mn≤0.10wt%, Cr≤0.10wt%, Ti≤0.10wt%, Zr≤0.10wt%, Zn≤0.50wt%, Fe≤0.20wt%, all the other components are Al and inevitable impurity.Below the detailed description of wherein major alloy components:
Mg, Si are the main alloy element of 6XXX line aluminium alloy, and they form main ageing strengthening phase β ".The strength level of Mg and Si element overall control material, specifically: Mg+Si content summation is larger, and the strength of materials is higher, but Mg+Si too high levels, the superfluous Mg of indissoluble will be formed in the tissue
2si.Superfluous Mg
2the existence of Si, not only can not improve the strength of materials, and likely brings adverse influence to the anodic oxidation performance of material.For ensureing higher efficient hardening level, Mg+Si total amount should remain on 1.4 ~ 2.6wt% and be advisable.
Usually Cu element is added, to improve intensity and the work hardening ability of material in 6XXX line aluminium alloy.But add too much Cu element and easily cause material corrosion resisting property and anodic oxidation degradation (as low in anode oxide film production rate, alumina diaphragm defect is more, silver color shade deviation etc.).For ensureing higher strengthening level and significantly not reducing the anodic oxidation performance of material, the content of Cu need control at 0.5 ~ 1.2wt% to be good.
Mn, Cr are trace element, and its adding purpose is the grain-size in order to control material, but the interpolation of these elements can produce adverse influence (as oxide film is partially yellow, low in glossiness) to the color and luster of material anode oxide film; On the other hand, too much add Mn, Cr element easily make material extrude after grain structure changed to fibrous Deformation structure by recrystallized structure, thus increase anodic oxidation defect " piebald " appearance.Therefore its content need control respectively: Mn≤0.10wt%, Cr≤0.10wt%, and preferably, Mn+Cr≤0.15wt%, more preferably, Mn+Cr≤0.10wt%.
Zr is trace element, and adding Zr can produce adverse influence (as oxide film is partially yellow, low in glossiness) to the color and luster of material anode oxide film, needs to be restricted to below 0.1wt%, preferred below 0.05wt%, more preferably below 0.01wt%.
Ti plays refinement as-cast grain in the alloy, is advisable to be no more than 0.10wt%, preferred below 0.05wt%.Zn, Fe element is the impurity element in material, need control at 0.5wt% and below 0.2wt% respectively.
In addition, the working method of aforementioned 6XXX line aluminium alloy is:
(1) semicontinuous casting rod: according to above-mentioned alloy proportion, by direct chill casting casting rod.
(2) homogenizing thermal treatment: casting rod is risen to 500 ~ 540 DEG C from room temperature with the temperature rise rate of 20 ~ 300 DEG C/h, and be incubated 10 ~ 20 hours; Be raised to 545 ~ 570 DEG C with the speed of 10 ~ 100 DEG C/h again, and be incubated 6 ~ 30 hours.The heat treated object of homogenizing is: dissolve eutectic structure, for follow-up Precipitation provides enough degree of supersaturations, and improves the hot workability of material.
(3) cool fast: rate of cooling is greater than 100 DEG C/h, is preferentially greater than 150 DEG C/h.After homogenizing terminates, need cool fast material, to avoid thick Mg
2si phase is formed in process of cooling, thus brings adverse influence to performance.
(4) extrude after the alloy material preheating obtained, the Heating temperature of extrusion ingot is 490 ~ 540 DEG C, and container temperature is 440 ~ 510 DEG C, die temperature is 460 ~ 520 DEG C, extrusion stem speed is 0.5 ~ 6mm/s, and squeeze wood temperature out is greater than 530 DEG C, is preferentially greater than 540 DEG C.Extrusion process in proper range, just need can be taken into account high-strength and good crystal grain and control.
(5) online cold quenching+aligning, finally carries out artificial aging.
By above complete processing, the High performance electronics appearance component novel aluminum alloy taking into account intensity and anodic oxidation performance can be obtained.Following comparative illustration examples and comparative examples of the present invention, can confirm technique effect of the present invention further according to these embodiments and comparative example.But cited embodiment is only the preferred embodiment of the present invention, the scope that should not be understood as the above-mentioned theme of the present invention is only limitted to this, allly conceives the technical scheme formed based on the technology of the present invention, all falls within protection scope of the present invention.
Embodiment 1
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:1.12wt%, Si:1.05wt%, Cu:0.95wt%, Mn:0.01wt%, Cr:0.01wt%, Fe:0.13wt%, Zn:0.1wt%, Ti:0.04wt%, Zr:0.002wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: rise to 530 DEG C from room temperature with the temperature rise rate of 90 DEG C/h, and be incubated 15 hours, be then raised to 550 DEG C with the speed of 50 DEG C/h, and be incubated 20 hours, then cool fast with 160 DEG C/h.Material is extruded to (Heating temperature of extrusion ingot is 520 DEG C, container temperature is 470 DEG C, and die temperature is 500 DEG C, and extrusion stem speed is 2.8mm/s, squeeze wood temperature out 540 DEG C), press quenching, align laggard row artificial aging (175 DEG C × 8h).
Embodiment 2
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:0.97wt%, Si:1.03wt%, Cu:0.88wt%, Mn:0.005wt%, Cr:0.005wt%, Fe:0.12wt%, Zn:0.02wt%, Ti:0.02wt%, Zr:0.005wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: rise to 535 DEG C from room temperature with the temperature rise rate of 80 DEG C/h, and be incubated 12 hours, be then raised to 550 DEG C with the speed of 15 DEG C/h, and be incubated 20 hours, then cool fast with 160 DEG C/h.Material is extruded to (Heating temperature of extrusion ingot is 530 DEG C, container temperature is 460 DEG C, and die temperature is 490 DEG C, and extrusion stem speed is 3mm/s, squeeze wood temperature out 545 DEG C), press quenching, align laggard row artificial aging (175 DEG C × 8h).
Embodiment 3
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:0.96wt%, Si:0.95wt%, Cu:0.65wt%, Mn:0.05wt%, Cr:0.03wt%, Fe:0.16wt%, Zn:0.11wt%, Ti:0.03wt%, Zr:0.003wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: rise to 535 DEG C from room temperature with the temperature rise rate of 75 DEG C/h, and be incubated 12 hours, be then raised to 550 DEG C with the speed of 10 DEG C/h, and be incubated 22 hours, then cool fast with 160 DEG C/h.Material is extruded to (Heating temperature of extrusion ingot is 520 DEG C, container temperature is 460 DEG C, and die temperature is 490 DEG C, and extrusion stem speed is 3mm/s, squeeze wood temperature out 550 DEG C), press quenching, align laggard row artificial aging (175 DEG C × 8h).
Embodiment 4
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:1.3wt%, Si:1.25wt%, Cu:1.1wt%, Mn:0.03wt%, Cr:0.05wt%, Fe:0.16wt%, Zn:0.02wt%, Ti:0.025wt%, Zr:0.005wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: rise to 535 DEG C from room temperature with the temperature rise rate of 75 DEG C/h, and be incubated 12 hours, be then raised to 550 DEG C with the speed of 10 DEG C/h, and be incubated 20 hours, then cool fast with 160 DEG C/h.Material is extruded to (Heating temperature of extrusion ingot is 520 DEG C, container temperature is 460 DEG C, and die temperature is 490 DEG C, and extrusion stem speed is 3mm/s, squeeze wood temperature out 545 DEG C), press quenching, align laggard row artificial aging (180 DEG C × 8h).
Comparative example 1
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:0.7wt%, Si:0.85wt%, Cu:0.22wt%, Mn:0.08wt%, Cr:0.20wt%, Fe:0.11wt%, Zn:0.01wt%, Ti:0.02wt%, Zr:0.05wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: rise to 535 DEG C from room temperature with the temperature rise rate of 80 DEG C/h, and be incubated 12 hours, be then raised to 550 DEG C with the speed of 10 DEG C/h, and be incubated 20 hours, then cool fast with 160 DEG C/h.Material is extruded to (Heating temperature of extrusion ingot is 530 DEG C, container temperature is 460 DEG C, and die temperature is 490 DEG C, and extrusion stem speed is 3mm/s, squeeze wood temperature out 545 DEG C), press quenching, align laggard row artificial aging (175 DEG C × 8h).
Comparative example 2
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:0.96wt%, Si:1.18wt%, Cu:0.65wt%, Mn:0.05wt%, Cr:0.03wt%, Fe:0.16wt%, Zn:0.11wt%, Ti:0.05wt%, Zr:0.005wt%, and surplus is Al.
The thermal treatment of alloy casting rod homogenizing: with stove be warming up to 510 DEG C insulation 20h time after, then fast cool (speed of cooling is greater than 120 DEG C/h).Material is extruded (Heating temperature of extrusion ingot is 520 DEG C, and container temperature is 470 DEG C, and die temperature is 500 DEG C, and extrusion stem speed is 2.9mm/s, squeeze wood temperature out 525 DEG C).Press quenching, align laggard row artificial aging (175 DEG C × 8h).
Comparative example 3
Semicontinuous casting rod: diameter 178mm, casting rod composition is by percentage to the quality: Mg:0.95wt%, Si:1.06wt%, Cu:0.38wt%, Mn:0.20wt%, Cr:0.25wt%, Fe:0.12wt%, Zn:0.02wt%, Ti:0.02wt%, Zr:0.05wt%, and surplus is Al.
Alloy casting rod homogenizing thermal treatment: be raised to 560 DEG C of insulations 16 hours with the speed of 60 DEG C/h, then cool (speed of cooling is greater than 120 DEG C/h) fast.Material is extruded (Heating temperature of extrusion ingot is 480 DEG C, and container temperature is 470 DEG C, and die temperature is 505 DEG C, and extrusion stem speed is 3.5mm/s, squeeze wood temperature out 537 DEG C).Press quenching, align laggard row artificial aging (175 DEG C × 8h).
Table 1 illustrates the mechanical property of embodiment and comparative example interalloy, and wherein adopt the complete processing identical with embodiment 2 in comparative example 1, in comparative example 2, the composition of material is identical with embodiment 3; Table 2 illustrates the anodic oxidation performance of embodiment and comparative example.
Table 1: mechanical property contrasts
| Rm/Mpa | R p0.2/Mpa | A/％ | |
| Embodiment 1 | 386 | 360 | 9 |
| Embodiment 2 | 395 | 368 | 10 |
| Embodiment 3 | 384 | 356 | 8 |
| Embodiment 4 | 402 | 370 | 7 |
| Comparative example 1 | 339 | 315 | 12 |
| Comparative example 2 | 332 | 320 | 13 |
| Comparative example 3 | 347 | 335 | 12 |
| 6061 | 310 | 276 | 17 |
| 6063 | 241 | 214 | 15 |
Table 2: anodic oxidation performance comparison
As shown in table 1 and table 2, the present invention by the content of each element in Reasonable adjustment aluminium alloy and controlled working technique, can make material obtain higher mechanical property; And after material anodic oxidation, beautiful, the glossy sense of appearance luster, consistent with 6063 aluminium alloys.
Claims (8)
1. a 6XXX line aluminium alloy, it is characterized in that: the composition of this aluminium alloy and mass percentage thereof are: Si:0.7 ~ 1.3wt%, Mg:0.7 ~ 1.3wt%, Cu:0.5 ~ 1.2wt%, Mn≤0.10wt%, Cr≤0.10wt%, Ti≤0.10wt%, Zr≤0.10wt%, Zn≤0.50wt%, Fe≤0.20wt%, all the other components are Al and inevitable impurity.
2. a kind of 6XXX line aluminium alloy according to claim 1, is characterized in that: in the middle of described al alloy component, the total content≤0.15wt% of Mn and Cr.
3. a kind of 6XXX line aluminium alloy according to claim 2, is characterized in that: in the middle of described al alloy component, the total content≤0.10wt% of Mn and Cr.
4. a kind of 6XXX line aluminium alloy according to claim 1, is characterized in that: in the middle of described al alloy component, the content≤0.05wt% of Zr.
5. a kind of 6XXX line aluminium alloy according to claim 4, is characterized in that: in the middle of described al alloy component, the content≤0.01wt% of Zr.
6. the working method of a kind of 6XXX line aluminium alloy according to claim 1 to 5 any one, is characterized in that procedure of processing is:
1. semicontinuous casting rod: according to alloy proportion, by direct chill casting casting rod;
2. homogenizing thermal treatment: rise to 500 ~ 540 DEG C with the temperature rise rate of 20 ~ 300 DEG C/h from room temperature, and be incubated 10 ~ 20 hours; Be raised to 545 ~ 570 DEG C with the speed of 10 ~ 100 DEG C/h again, and be incubated 6 ~ 30 hours;
3. cool fast: rate of cooling >=100 DEG C/h;
4. extrude after the alloy material preheating obtained, the Heating temperature of extrusion ingot is 490 ~ 540 DEG C, and container temperature is 440 ~ 510 DEG C, and die temperature is 460 ~ 520 DEG C, and extrusion stem speed is 0.5 ~ 6mm/s, squeeze wood temperature out >=530 DEG C;
5. online cold quenching+aligning, finally carries out artificial aging.
7. the working method of a kind of 6XXX line aluminium alloy according to claim 6, is characterized in that: described step 3. in the middle of, rate of cooling >=150 DEG C/h.
8. the working method of a kind of 6XXX line aluminium alloy according to claim 6, is characterized in that: described step 4. in the middle of, squeeze wood temperature out >=540 DEG C.
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