Summary of the invention
The objective of the invention is to overcome the deficiency of AM series magnesium alloy, a kind of have good organization and excellent properties are provided, the automobile component of high-strength, high tenacity are with magnesium alloy and preparation method thereof.
The present invention is by the following technical solutions:
A kind of automobile component magnesium alloy, its component and weight percentage are: Al:5.0~7.0%, Mn:0.24~0.55%, Ti:0.025~0.075%, C:0.00125~0.00375%, RE:0.01~0.03%, impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%, surplus is Mg.
A kind of automobile component comprise the steps: with the preparation method of magnesium alloy
The first step, Steel Crucible are heated to 400 ℃, feed shielding gas SF
6And CO
2, add the AM60B magnesium alloy after removing surface irregularities behind the 5min, SF
6Flow is 40~50ml/min, CO
2Flow is 0.2~0.3m
3/ h;
Second the step, with the Al-Ti-C-RE master alloy through 150 ℃ ~ 250 ℃ preheating 15 ~ 30min;
The 3rd step, the Steel Crucible temperature is risen to 720 ℃, addition is accounted for the Al-Ti-C-RE master alloy of AM60B magnesium alloy gross weight 0.5% ~ 1.5%, be added in the molten state AM60B magnesium alloy, the Steel Crucible temperature is risen to 740 ℃ and be incubated 5 ~ 10min, evenly stir;
The 4th step, the Steel Crucible temperature is reduced to 710 ~ 720 ℃, leave standstill the oxide compound of removing the surface behind 10min ~ 20min, be poured in the metal die.
Further, in described the 4th step, be preheated to 100 ℃ after the rust cleaning in the metal die before the cast, coat the coating of the anti-oxidation easy demoulding at the metal die inner chamber, be preheated to 250 ℃ again, feed shielding gas 30s ~ 60s, described shielding gas is SF
6And CO
2
Further, in the described the first step, add the preceding AM60B magnesium alloy of Steel Crucible preheating 0.3h ~ 0.5h under 150 ~ 200 ℃ of temperature earlier.
Further, the chemical ingredients of described master alloy Al-Ti-C-RE and mass percent are: Al: 92.75%, and Ti:5%, C:0.25%, RE:2%.
Beneficial effect of the present invention is:
1, fining agent adopts the Al-Ti-C-RE master alloy to replace original carbonaceous material such as hexachloroethane, paraffin, carbon black etc., avoided original carbonaceous material its because of emitting of the very big harm of a large amount of toxic gases in the process on the turn to environment and human body generation; Al-Ti-C-RE not only has good refinement modification effect to the AM60B magnesium alloy, and cost is low, the operation is simple and easy, free from environmental pollution.
2, C, Ti, RE element add with the form of master alloy Al-Ti-C-RE, and fusing is fast, the specific absorption height, and preparation technology is simple, and it is convenient to implement.
3, in the AM60B alloy, add C, Ti, RE element simultaneously,, not only can change dendrite gap and the size of α-Mg, and can change Mg by refinement and rotten dual function
17Al
12Phase amount, size, pattern and distribution significantly improve alloy structure, improve alloy mechanical property.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can realize by following specification sheets specifically noted structure and obtain.
Embodiment
Below in conjunction with embodiment the present invention is further described:
Embodiment 1: contain Al:5.0~7.0% with preparation, Mn:0.24~0.55%, Ti:0.025%, C:0.00125%, RE:0.01%, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) all the other are example for the magnesium alloy of Mg.
The first step, Steel Crucible are heated to 400 ℃, feed SF
6+ CO
2Shielding gas (SF
6Flow is 45ml/min, CO
2Flow is 0.25m
3/ h) adding the AM60B magnesium alloy behind the 5min, the AM60B magnesium alloy needs first oil removing, dewaters and surperficial foreign material such as oxide compound preheating 0.5h under 150 ℃ of temperature;
In second step, the Al-Ti-C-RE master alloy is through 200 ℃ of preheating 15min;
The 3rd step rose to 720 ℃ with the Steel Crucible temperature, and the furnace charge that is housed to (being the AM60B magnesium alloy) all after the fusing, adds the Al-Ti-C-RE master alloy that accounts for AM60B magnesium alloy gross weight 0.5%, and the Steel Crucible temperature is risen to 740 ℃ and be incubated 5min, stirred;
The 4th step, the Steel Crucible temperature is reduced to 710 ℃, leave standstill the oxide compound of removing the surface behind the 20min, be poured in the metal die; Metal die needs pre-treatment before the cast: after adopting diameter to be the metal die rust cleaning of 25mm, be preheated to 100 ℃ earlier before cast, coat then with Al (OH)
3, the coating that is mixed with of Starso and water, be preheated to 250 ℃ again, feed shielding gas 30s~60s, shielding gas is SF
6And CO
2
The metal die inner chamber needs first preheating stenciling coating again, can make like this that moisture evaporates rapidly in the coating, and the effect of coating is anti-oxidation and is easy to the demoulding.Should prevent that evenly coating is dirty by spary, purpose is for obtaining the fine and close dope layer uniformly of one deck.During stenciling coating, mold preheating temperature is (preheating temperature is unsuitable too high, otherwise coating peels off easily) about 100 ℃, is preheated to 250 ℃ behind the stenciling coating again.In whole casting process, guarantee that melt all is under the protection of shielding gas, near funnel, cast should be steady as far as possible for cast gate during cast, avoids eddy current and splash.
In the 5th step, Steel Crucible is poured out remaining magnesium alloy liquation after cast finishes, naturally cool to below 150 ℃, slowly pours hot water into, behind the immersion several hrs, removes remaining slag.
OM and SEM pattern show, after the AM60B magnesium alloy adds the Al-Ti-C-RE master alloy, in the alloy originally thick α-Mg dentrite diminish slightly, dendrite interval is not found out obviously and is reduced; Originally be continuous or semicontinuous netted Mg
17Al
12Part fracture mutually, but still have continuous net-shaped Mg
17Al
12Be distributed on the magnesium matrix mutually.
The tensile property of sample: under this experiment condition, this Al:5.0~7.0% that contains, Mn:0.24~0.55%, Ti:0.025%, C:0.00125%, RE:0.01%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) magnesium alloy tensile strength is 175Mpa, elongation 10.3%.
Embodiment 2: contain Al:5.0~7.0% with preparation, Mn:0.24~0.55%, Ti:0.04%, C:0.002%, RE:0.016%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) magnesium alloy be example.
The first step, Steel Crucible are heated to 400 ℃, feed SF
6+ CO
2Shielding gas (SF
6Flow is 40ml/min, CO
2Flow is 0.3m
3/ h) add the AM60B magnesium alloy behind the 5min;
In second step, the Al-Ti-C-RE master alloy is through 150 ℃ of preheating 30min;
The 3rd step rose to 720 ℃ with the Steel Crucible temperature, and the furnace charge that is housed to (being the AM60B magnesium alloy) all after the fusing, adds the Al-Ti-C-RE master alloy that accounts for AM60B magnesium alloy gross weight 0.8%, and the Steel Crucible temperature is risen to 740 ℃ and be incubated 8min, stirred;
The 4th step, the Steel Crucible temperature is reduced to 710 ℃, leave standstill the oxide compound of removing the surface behind the 10min, be poured in the metal die; The preprocessing process such as the embodiment 1 of metal die before the cast;
In the 5th step, Steel Crucible is poured out remaining magnesium alloy liquation after cast finishes, naturally cool to below 150 ℃, slowly pours hot water into, behind the immersion several hrs, removes remaining slag.
OM and SEM pattern show that after AM60B added the Al-Ti-C-RE master alloy, the thick α-Mg dentrite of script diminished in the alloy, and primary dendritic spacing and secondary dendrite arm spacing reduce slightly, are continuous or semicontinuous netted Mg originally
17Al
12Substantially interrupted mutually, be corynebacterium or semicontinuous shape discrete distribution on magnesium matrix.
The tensile property of sample: under this experiment condition, this Al:5.0~7.0% that contains, Mn:0.24~0.55%, Ti:0.04%, C:0.002%, RE:0.016%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, the tensile strength of magnesium alloy Fe≤0.005%) is 186Mpa, elongation 11.1%.
Embodiment 3: contain Al:5.0~7.0% with preparation, Mn:0.24~0.55%, Ti:0.05%, C:0.0025%, RE:0.02%, all the other are Mg(impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) magnesium alloy be example.
The first step, Steel Crucible are heated to 400 ℃, feed SF
6+ CO
2Shielding gas (SF
6Flow is 50ml/min, CO
2Flow is 0.2m
3/ h) add the AM60B magnesium alloy behind the 5min;
In second step, the Al-Ti-C-RE master alloy is through 250 ℃ of preheating 15min;
The 3rd step, the Steel Crucible temperature is risen to 720 ℃, and the furnace charge that is housed to (being the AM60B magnesium alloy) adds the Al-Ti-C-RE master alloy that accounts for AM60B magnesium alloy gross weight 1.0% after all melting, the Steel Crucible temperature is risen to 740 ℃ and be incubated 10min, stir;
The 4th step, the Steel Crucible temperature is reduced to 710 ℃, leave standstill the oxide compound of removing the surface behind the 15min, be poured in the metal die; The preprocessing process such as the embodiment 1 of metal die before the cast;
In the 5th step, Steel Crucible is poured out remaining magnesium alloy liquation after cast finishes, naturally cool to below 150 ℃, slowly pours hot water into, behind the immersion several hrs, removes remaining slag.
OM and SEM pattern show that after AM60B added the Al-Ti-C-RE master alloy, the thick α-Mg dentrite of script obviously diminished in the alloy, and primary dendritic spacing and secondary dendrite arm spacing are less; Continuous or semicontinuous netted Mg
17Al
12All interrupted mutually, be corynebacterium or the cobble shape is uniformly distributed on the magnesium matrix.
The tensile property of sample: under this experiment condition, this Al:5.0~7.0% that contains, Mn:0.24~0.55%, Ti:0.05%, C:0.0025%, RE:0.02%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) magnesium alloy tensile strength is 195Mpa, and elongation is 11.3%
Embodiment 4: contain Al:5.0~7.0% with preparation, Mn:0.24~0.55%, Ti:0.075%, C:0.00375%, RE:0.03%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, Fe≤0.005%) magnesium alloy be example.
The first step, Steel Crucible are heated to 400 ℃, feed SF
6+ CO
2Shielding gas (SF
6Flow is 45ml/min, CO
2Flow is 0.25m
3/ h) add the AM60B magnesium alloy behind the 5min;
In second step, the Al-Ti-C-RE master alloy is through 250 ℃ of preheating 20min;
The 3rd step, the Steel Crucible temperature is risen to 720 ℃, and the furnace charge that is housed to (being the AM60B magnesium alloy) adds the Al-Ti-C-RE master alloy that accounts for AM60B magnesium alloy gross weight 1.5% after all melting, the Steel Crucible temperature is risen to 740 ℃ and be incubated 10min, stir;
The 4th step, the Steel Crucible temperature is reduced to 720 ℃, leave standstill the oxide compound of removing the surface behind the 10min, be poured in the metal die; The preprocessing process such as the embodiment 1 of metal die before the cast;
In the 5th step, Steel Crucible is poured out remaining magnesium alloy liquation after cast finishes, naturally cool to below 150 ℃, slowly pours hot water into, behind the immersion several hrs, removes remaining slag.
OM and SEM pattern show, after AM60B adds 1.5% Al-Ti-C-RE master alloy, though originally thick α-Mg dentrite by refinement, primary dendritic spacing and secondary dendrite arm spacing reduce and are not obvious, continuous or semicontinuous netted Mg
17Al
12Have only the part fracture to disperse mutually, be semicontinuous corynebacterium and be distributed on the magnesium matrix.Compare with embodiment 3, thinning effect presents decay.But the thinning effect of embodiment 4 is better than the thinning effect of embodiment 1.
The tensile property of sample: under this experiment condition, this Al:5.0~7.0% that contains, Mn:0.24~0.55%, Ti:0.075%, C:0.00375%, RE:0.03%, all the other are Mg, (impurity element: Zn≤0.22%, Si≤0.10%, Cu≤0.01%, Ni≤0.002%, the tensile strength of magnesium alloy Fe≤0.005%) is 180Mpa, and elongation is 10.5%.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications that those of ordinary skills make technical scheme of the present invention or be equal to replacement, only otherwise break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.