CN110029254A - A kind of multicomponent microalloying two-phase magnesium lithium alloy and preparation method thereof - Google Patents
A kind of multicomponent microalloying two-phase magnesium lithium alloy and preparation method thereof Download PDFInfo
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- CN110029254A CN110029254A CN201910335920.1A CN201910335920A CN110029254A CN 110029254 A CN110029254 A CN 110029254A CN 201910335920 A CN201910335920 A CN 201910335920A CN 110029254 A CN110029254 A CN 110029254A
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- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
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Abstract
The present invention provides a kind of multicomponent microalloying two-phase magnesium lithium alloy and preparation method thereof, multicomponent microalloying two-phase magnesium lithium alloy is made of the element of following mass percent: Li 9.10%~9.50%, Al 1.80%~2.20%, Zn 1.20%~1.50%, Zr 0.20%~1.00%, Ca 0.10%~0.50%, Ag 0.10%~0.50%, light rare earth elements 0.10%~0.50%, heavy rare earth element 0.10%~2.00%, remaining is Mg and impurity element.Multicomponent microalloying two-phase magnesium lithium alloy of the invention and preparation method thereof rationally controls Li constituent content, form the alpha+beta duplex structure of α phase, β phase optimal proportion, and by multicomponent microalloying mode, to obtain while there is high-intensitive and high-elongation two-phase magnesium lithium alloy.
Description
Technical field
The invention belongs to metal material processing technical fields, and in particular to a kind of multicomponent microalloying two-phase magnesium lithium alloy and
Preparation method.
Background technique
Magnesium alloy is most light structural metallic materials, and density is only the 2/3 of aluminium alloy, the 1/4 of steel.With other metals
Structural material is compared, and magnesium alloy has high specific strength, specific stiffness, damping and amortization, electromagnetic shielding performance and Cutting free, easily recycling etc. excellent
Point has important application value and wide application in fields such as aerospace, defense military industry, automobile, telecommunications
Prospect.
Magnesium alloy can be divided by alloying ingredients: the series alloys such as magnalium, magnesium zinc, magnesium lithium and magnesium rare earth.Lithium metal is made
For most light metallic element, density only has 0.534g/cm3, thus magnesium lithium alloy is the minimum magnesium alloy of density, is navigated in aviation
The fields such as it and defense military are expected to replace aluminium alloy, titanium alloy etc materials.According to Mg-Li binary alloy phase diagram, when containing for Li
In 5.7~10.3wt.%, magnesium lithium alloy is made of amount alpha+beta two-phase, and α phase is the magnesium sosoloid of close-packed hexagonal lattice structure, and
β phase is the lithium solid solution of body-centered cubic lattic structure.When lithium content is more than 10.3wt.%, magnesium lithium alloy is deposited with single β phase
?.When lithium content is lower than 5.7wt.%, alloy exists with single α phase.
The magnesium sosoloid of the close-packed hexagonal lattice structure of α phase can be such that the intensity of magnesium lithium alloy improves, still, due to solid matter six
The slip system that can independently start in square structure is less, and plasticity is poor, therefore, α phase close-packed hexagonal lattice structure in magnesium lithium alloy
The intensity of the more magnesium lithium alloys of magnesium sosoloid is higher, but accordingly will cause substantially reducing for alloy plasticity, and elongation percentage substantially reduces；
And the plasticity of magnesium lithium alloy can be improved in the lithium solid solution of the body-centered cubic lattic structure of β phase, but increasing for β phase makes magnesium lithium alloy
Intensity decline.Therefore, magnesium lithium alloy in the prior art can not obtain high-intensitive and high-elongation simultaneously.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of multicomponent microalloying two-phase magnesium lithium alloys and preparation method thereof, lead to
The two-phase magnesium lithium alloy that the techniques such as multicomponent microalloying, casting, Plastic Forming and heat treatment obtain high-strength high-elongation ratio is crossed, it can
Magnesium lithium alloy intensity and elongation percentage are improved simultaneously.
To solve the above-mentioned problems, the present invention provides a kind of multicomponent microalloying two-phase magnesium lithium alloy, by following quality hundred
The element of score forms: Li 9.10%~9.50%, Al 1.80%~2.20%, Zn1.20%~1.50%, Zr 0.20%
~1.00%, Ca 0.10%~0.50%, Ag 0.10%~0.50%, light rare earth elements 0.10%~0.50%, heavy rare earth
Element 0.10%~2.00%, remaining is Mg and impurity element.
The multicomponent microalloying two-phase magnesium lithium alloy makes to be formed in magnesium lithium alloy by the Reasonable Regulation And Control to Li constituent content
The alpha+beta duplex structure of α phase, β phase optimal proportion range is substantially mentioned by accounting for the β phase of body-centered cubic structure of more volume fractions
The elongation percentage of high material improves the intensity of material by the α phase of close-packed hexagonal；Simultaneously by multicomponent microalloying mode, formed
The second phase of small and dispersed further increases alloy material intensity, to obtain while have high-intensitive and high-elongation two-phase
Magnesium lithium alloy.Wherein, the addition of suitable Al and Zn makes Al and Zn form MgLi2Al and MgLi2Zn phase, further improves
The intensity of alloy, and the suitable Ag and heavy rare earth element being added, can inhibit MgLi2Al and MgLi2Zn two in ag(e)ing process
Phase decomposition is softening phase, so that the intensity of alloy further increases；The addition of Zr, Ca can refine ingot casting crystallite dimension, in turn
Reduce ingotism；And the addition of a small amount of light rare earth elements is combined, the texture formed in plastic history can be weakened, and formed
Uniformly tiny grain structure, so that alloy has good elongation percentage.
Rare earth element is generally divided into two subtribes, including with lower atomic number and the light rare earth of smaller quality member
The heavy rare earth element of atomic number and larger quality plain and with higher, wherein light rare earth elements includes lanthanum La, cerium Ce, praseodymium
7 Pr, neodymium Nd, promethium Pm, samarium Sm, europium Eu elements, heavy rare earth element include gadolinium Gd, terbium Tb, dysprosium Dy, holmium Ho, erbium Er, thulium Tm, ytterbium
Yb, lutetium Lu, yttrium Y.
In technical solution, it is preferred that one of light rare earth elements La, Ce, Nd, Sm or a variety of.
In technical solution, it is preferred that one of heavy rare earth element Gd, Tb, Er, Tm, Yb, Y or a variety of.
Wherein, impurity element refers to the inevitable impurity brought into during preparing alloy by the raw material for preparing alloy
Element is present in metal or nonmetalloid in metal but that be not intended that addition or reservation, it is preferred that inevitably
The mass percent of impurity element is 0%-0.15%, it is further preferred that the mass percent of Na is less than conjunction in impurity element
The 0.06% of golden amount.
In technical solution, it is preferred that the multicomponent microalloying two-phase magnesium lithium alloy by following mass percent element group
At: Li 9.20%~9.30%, Al 1.90%~2.10%, Zn 1.30%~1.40%, Zr0.50%~0.80%, Ca
0.20%~0.40%, Ag 0.10%~0.30%, light rare earth elements 0.20%~0.30%, heavy rare earth element 1.00%~
1.50%, remaining is Mg and impurity element.
It is further preferred that the multicomponent microalloying two-phase magnesium lithium alloy is made of the element of following mass percent: Li
9.20%, Al 2.00%, Zn 1.30%, Zr 0.50%, Ca 0.30%, Ag 0.20%, Ce 0.25%, Gd 1.50%,
Remaining is Mg and impurity element.
It is a further object of the present invention to provide a kind of methods for preparing above-mentioned multicomponent microalloying two-phase magnesium lithium alloy, including
Following steps:
S1. raw material is taken by selected mass percent；
S2. raw material in step S1 is mixed, then carries out melting, refining obtains melt；
S3. it is cast using melt in step S2, obtains ingot casting；
S4. Homogenization Treatments are carried out to ingot casting in step S3, and is cut into blank；
S5. blank in step S4 is formed to obtain molded part；
S6. ageing strengthening is carried out to molded part in step S5 to handle to obtain multicomponent microalloying two-phase magnesium lithium alloy.
Wherein, it is preferred that step S1 specifically: according to selected mass percent take pure magnesium ingot, fine aluminium ingot, pure zinc ingot,
Fine silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg- rare earth intermediate alloy.Specifically, Mg-Li
Intermediate alloy can be used Mg-20%Li intermediate alloy, and Mg-Zr intermediate alloy can be used Mg-30%Zr intermediate alloy, in Mg-Ca
Between alloy Mg-30%Ca intermediate alloy can be used, Mg-30%RE intermediate alloy can be used in Mg- rare earth intermediate alloy.
Wherein, it is preferred that step S2 specifically: raw material is mixed, is then heated under protective atmosphere in 700-740 DEG C,
Melting 40-60min, and 20-40min is refined, to exclude the field trash in melt, 740-760 DEG C is warming up to after refining, and stand
30-40min.Preferably, step S2 specifically: raw material is heated under protective atmosphere in 700 DEG C, melting 60min, and refined
20min is warming up to 760 DEG C after refining, stand 40min.It is further preferred that also being obtained to melting molten in fusion process
Body is stirred, mixing time 5-15min.It is further preferred that mixing time is 10min.Wherein, the process of refining can lead to
The realization of addition refining agent is crossed, can also be realized by being blown into the gases such as Ar in refining furnace.Wherein, protective atmosphere is indifferent gas
Atmosphere can be argon gas, nitrogen or helium, preferably argon gas.Since alloy inevitably can be absorbed and be carried in fusion process
Gas and generation field trash, can be such that the purity of alloy reduces in this way, and the gas and field trash of generation can be discharged by refining, mention
The purity and quality of high alloy, the heating standing after refining can make impurity floating upward quickly or sinking, further increase the pure of alloy
Degree.
It wherein, the use of the cast temperature that melt in step S2 is cast is 650-680 DEG C in step S3, it is preferred that pour
Casting temperature is 660 DEG C.
Wherein, Homogenization Treatments selection double_stage guide processing in step S4, specifically: ingot casting is warming up to 280~320 DEG C
And 1-16h is kept the temperature, then heat to 360-400 DEG C and keeps the temperature 2-24h.The preferably air-cooled drop of temperature-fall period after Homogenization Treatments
Warm mode.Using double_stage guide treatment process, the content of the second phase in alloy before being plastically deformed on the one hand can be reduced, on the other hand
Part low melting point can be prevented mutually to melt and grain coarsening in heat treatment process, established to obtain the tissue of fine uniform after deformation
Basis.
Wherein, molding mode is extrusion forming, roll forming, casting and forming or forging molding in step S5, wherein excellent
Choosing, the extruding temperature of extrusion forming is 150-400 DEG C, extrusion ratio 10:1-60:1, extrusion speed 0.1-40m/min；It rolls
Making molding start rolling temperature is 350 DEG C, and finishing temperature is 150~250 DEG C, reduction in pass 5%~20%, and total reduction is
50%~90%, 0.5~40m/min of mill speed.
Wherein, the condition of ageing strengthening is in step S6: temperature is 50-150 DEG C, time 1-48h.
Compared with the prior art, the present invention has the following beneficial effects:
1. multicomponent microalloying two-phase magnesium lithium alloy of the invention makes magnesium lithium by the reasonable control to Li constituent content
Alpha+beta duplex structure that α phase, β phase optimal proportion range are formed in alloy, by the body-centered cubic structure for accounting for more volume fractions
β phase greatly improves the elongation percentage of material, and the intensity of material is improved by the α phase of close-packed hexagonal；Pass through multicomponent microalloying simultaneously
Mode forms the second phase of small and dispersed and further increases alloy material intensity, to obtain while have high-intensitive and Gao Yan
Stretch the two-phase magnesium lithium alloy of rate；
2. multicomponent microalloying two-phase magnesium lithium alloy of the invention also forms MgLi2Al by the way that suitable Al and Zn is added
With MgLi2Zn phase, the intensity of alloy is further improved；It is additionally added suitable Ag and heavy rare earth element, is inhibited in ag(e)ing process
Above two phase decomposition is softening phase, so that the intensity of alloy further increases；
3. multicomponent microalloying two-phase magnesium lithium alloy of the invention also refines ingot casting crystallite dimension by the way that Zr, Ca is added, into
And reduce ingotism；And the addition of a small amount of light rare earth elements is combined, the texture formed in plastic history is weakened, and formed
Uniformly tiny grain structure, so that alloy has good elongation percentage；
4. the preparation method of multicomponent microalloying two-phase magnesium lithium alloy of the invention, using double_stage guide treatment process, one
Aspect reduces the content for being plastically deformed the second phase in preceding alloy, on the other hand can prevent low melting point phase in part in heat treatment process
Fusing and grain coarsening, this be to obtain the tissue of fine uniform after deforming to lay a good foundation；
5. multicomponent microalloying two-phase magnesium lithium alloy of the invention improves material by the microalloying of multiple element
Mechanical property, and material processing speed is high, at low cost, thus the alloy has good application in aerospace and military industry field
Prospect.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Embodiment one
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.20%, Al 2.00%, Zn 1.30%, Zr 0.50%, Ca 0.30%, Ag 0.20%, Ce 0.25%, Gd 1.50%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Ce intermediate alloy and Mg-Gd intermediate alloy；
2. under the protection of argon gas, 700 DEG C of meltings keep the temperature 60min, 10min is stirred, and refine 20min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 660 DEG C to 760 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 300 DEG C, soaking time 8h then heats to 400 DEG C, heat preservation
Time 12h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
4. taking above-mentioned blank, 300 DEG C of temperature, extrusion ratio 40, extrusion speed 20m/min condition are being squeezed by extruder
Under, it is squeezed into bar；
5. taking above-mentioned bar, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 80 DEG C, and the time is for 24 hours, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of the present embodiment
It is shown in Table 1.
Embodiment two
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.10%, Al 1.80%, Zn 1.20%, Zr 0.20%, Ca 0.10%, Ag 0.10%, La 0.10%, Y 0.10%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-La intermediate alloy and Mg-Y intermediate alloy；
2. under the protection of argon gas, 720 DEG C of meltings keep the temperature 40min, 5min is stirred, and refine 20min, risen after refining
Temperature stands 30min, pours into semicontinuous ingot casting at 650 DEG C to 740 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 280 DEG C, soaking time 6h then heats to 360 DEG C, heat preservation
Time 18h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
It is 350 DEG C in start rolling temperature, finishing temperature is 150 DEG C, reduction in pass 5~20%, stagnation pressure 4. taking above-mentioned blank
Lower rate is 80%, under the conditions of the rolling mill practice of mill speed 10m/min, is processed into plate；
5. taking above-mentioned plate, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 60 DEG C, and the time is for 24 hours, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of the present embodiment
It is shown in Table 1.
Embodiment three
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.50%, Al 2.20%, Zn 1.50%, Zr 1.00%, Ca 0.50%, Ag 0.50%, Nd 0.50%, Er 2.00%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Nd intermediate alloy and Mg-Er intermediate alloy；
2. under the protection of argon gas, 740 DEG C of meltings keep the temperature 50min, 15min is stirred, and refine 40min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 680 DEG C to 760 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 320 DEG C, soaking time 16h then heats to 400 DEG C, heat preservation
Time 8h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
4. taking above-mentioned blank, 350 DEG C of temperature, extrusion ratio 30, extrusion speed 10m/min condition are being squeezed by extruder
Under, it is squeezed into bar；
5. taking above-mentioned bar, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 100 DEG C, time 36h, into
One step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of the present embodiment
It is shown in Table 1.
Example IV
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.40%, Al 1.80%, Zn 1.40%, Zr 0.30%, Ca 0.20%, Ag 0.20%, Sm 0.20%, Yb 1.00%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Sm intermediate alloy and Mg-Yb intermediate alloy；
2. under the protection of argon gas, 710 DEG C of meltings keep the temperature 40min, 10min is stirred, and refine 30min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 650 DEG C to 750 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 290 DEG C, soaking time 12h then heats to 380 DEG C, heat preservation
Time is 14h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
It is 350 DEG C in start rolling temperature, finishing temperature is 200 DEG C, reduction in pass 5~20%, always 4. taking above-mentioned blank
Reduction ratio is 90%, under the conditions of the rolling mill practices such as mill speed 5m/min, is processed into plate；
5. taking above-mentioned plate, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 50 DEG C, time 48h, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of the present embodiment
It is shown in Table 1.
Embodiment five
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.30%, Al 2.10%, Zn 1.40%, Zr 0.80%, Ca 0.40%, Ag 0.30%, Ce 0.30%, Tb 1.50%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Ce intermediate alloy and Mg-Tb intermediate alloy；
2. under the protection of argon gas, 730 DEG C of meltings keep the temperature 40min, 10min is stirred, and refine 20min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 680 DEG C to 750 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 310 DEG C, soaking time 8h then heats to 390 DEG C, heat preservation
Time 12h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
4. taking above-mentioned blank, 350 DEG C of temperature, extrusion ratio 40, extrusion speed 20m/min condition are being squeezed by extruder
Under, it is squeezed into bar；
5. taking above-mentioned bar, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 80 DEG C, and the time is for 24 hours, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of the present embodiment
It is shown in Table 1.
Comparative example 1
The magnesium lithium alloy of the comparative example is the magnesium lithium alloy that the commercially available trade mark is LZ91, the chemical component of the alloy are as follows: Mg-
9.0wt%Li-1.0wt%Zn, i.e. 9.0wt% containing Li, Zn 1.0wt%, remaining is Mg.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
Comparative example 2
The preparation method of alloy is same as Example 1 in the comparative example, and difference is composition of alloy, the magnesium lithium of the comparative example
The element group of alloy becomes, and by mass percentage includes: Li 11.0%, Al 1.00%, Zn 2.30%, Zr 0.50%, Ca
0.30%, Ag 0.20%, Ce 0.25%, Gd 1.50%, remaining is Mg and inevitable impurity element.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
Comparative example 3
The preparation method of alloy is same as Example 1 in the comparative example, and difference is composition of alloy, the magnesium lithium of the comparative example
The element group of alloy becomes, and by mass percentage includes: Li 5.0%, Al 1.00%, Zn 2.30%, Zr 0.20%, Ca
0.30%, Ag 1.20%, Ce 1.25%, Gd 4.50%, remaining is Mg and inevitable impurity element.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
Comparative example 4
Multicomponent microalloying two-phase magnesium lithium alloy described in this reference examples, is made of: Li the element of following mass percent
9.20%, Al 3.00%, Zn 0.60%, Zr 0.50%, Ca 0.30%, Ag 0.40%, Ce0.25%, Gd 1.00%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Ce intermediate alloy and Mg-Gd intermediate alloy；
2. under the protection of argon gas, 700 DEG C of meltings keep the temperature 60min, 10min is stirred, and refine 20min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 660 DEG C to 760 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 300 DEG C, soaking time 8h then heats to 400 DEG C, heat preservation
Time 12h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
4. taking above-mentioned blank, 300 DEG C of temperature, extrusion ratio 40, extrusion speed 20m/min condition are being squeezed by extruder
Under, it is squeezed into bar；
5. taking above-mentioned bar, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 80 DEG C, and the time is for 24 hours, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
Comparative example 5
Multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment, is made of: Li the element of following mass percent
9.20%, Al 2.00%, Zn 1.30%, Zr 0.10%, Ca 0.60%, Ag 0.20%, Ce0.35%, Gd 1.50%,
Remaining is Mg and inevitable impurity element, and the mass percent summation of impurity element is less than 0.15%, Na mass percent
Less than 0.06%.
The preparation method of multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Ce intermediate alloy and Mg-Gd intermediate alloy；
2. under the protection of argon gas, 700 DEG C of meltings keep the temperature 60min, 10min is stirred, and refine 20min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 660 DEG C to 760 DEG C；
3. above-mentioned ingot casting is taken to carry out Homogenization Treatments, at 300 DEG C, soaking time 8h then heats to 400 DEG C, heat preservation
Time 12h；Then it cools down, the type of cooling is air-cooled；It is cut into corresponding blank later and removes the peel；
4. taking above-mentioned blank, 300 DEG C of temperature, extrusion ratio 40, extrusion speed 20m/min condition are being squeezed by extruder
Under, it is squeezed into bar；
5. taking above-mentioned bar, ageing strengthening processing is carried out, ageing strengthening treatment temperature is 80 DEG C, and the time is for 24 hours, into one
Step improves its intensity, obtains multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
Comparative example 6
The composition of alloy is same as Example 1 in the comparative example, the difference is that the preparation side of the alloy of the comparative example
The preparation method of method, multicomponent microalloying two-phase magnesium lithium alloy described in the present embodiment is specific as follows:
1. weigh raw material by the proportion of above-mentioned mass percent, above-mentioned raw materials are using pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure
Silver powder, Mg-Li intermediate alloy, Mg-Zr intermediate alloy, Mg-Ca intermediate alloy, Mg-Ce intermediate alloy and Mg-Gd intermediate alloy；
2. under the protection of argon gas, 700 DEG C of meltings keep the temperature 60min, 10min is stirred, and refine 20min, risen after refining
Temperature stands 40min, pours into semicontinuous ingot casting at 660 DEG C to 760 DEG C；
3. taking above-mentioned ingot casting to be cut into corresponding blank and removing the peel；
4. taking above-mentioned blank, 450 DEG C of temperature, extrusion ratio 10, extrusion speed 10m/min condition are being squeezed by extruder
Under, it is squeezed into bar, obtains multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example.
The multicomponent microalloying two-phase magnesium lithium alloy described in this comparative example carries out Mechanics Performance Testing, Mechanics Performance Testing
Method is executed according to GB T 228.1-2010, the mechanical performance index of the multicomponent microalloying two-phase magnesium lithium alloy of this comparative example
It is shown in Table 1.
1 magnesium lithium alloy room-temperature mechanical property of table
The tensile strength of the multicomponent microalloying two-phase magnesium lithium alloy of the application it can be seen from mechanical experimental results
Up to 220~250MPa, yield strength is up to 160~190MPa, while elongation percentage is still up to 40%-50%.
Compared with the trade mark of comparative example 1 is the magnesium lithium alloy of LZ91, multicomponent microalloying two-phase magnesium lithium alloy of the invention
Tensile strength, yield strength and elongation percentage obviously much higher than the trade mark be LZ91 magnesium lithium alloy.
In the magnesium lithium alloy of comparative example 2, Li content is 11.0%, is greater than 10.3%, there was only single body-centered in alloy
The β phase of cubic lattice structure, tensile strength, yield strength and the elongation percentage of multicomponent microalloying two-phase magnesium lithium alloy of the invention
The magnesium lithium alloy that Li content obviously higher than comparative example 2 is 11.0%.
In the magnesium lithium alloy of comparative example 3, Li content is 5%, less than 5.7%, there was only single close-packed hexagonal in alloy
The α phase of lattice structure, although the multicomponent microalloying two-phase magnesium lithium alloy height that tensile strength, yield strength ratio are of the invention,
Its elongation percentage is only 12%, well below 40%-50% of the invention, therefore, though the magnesium lithium alloy of comparative example 3 improves by force
Degree, but substantially reduces its plasticity.
In magnesium lithium alloy in comparative example 4, the content of other elements is consistent with content in embodiment one, and Al, Zn,
The tensile strength of the content range that the content of Ag, Gd are not limited in the application, the magnesium lithium alloy of comparative example 4 is better than embodiment one,
But elongation percentage only has 36%.
In magnesium lithium alloy in comparative example 5, the content of other elements is consistent with content in embodiment one, and Zr, Ca, Ce
The content range that is not limited in the application of content, the tensile strength of the magnesium lithium alloy of comparative example 5, yield strength and elongation percentage are equal
Significantly lower than embodiment one.
Magnesium lithium alloy in comparative example 6 is identical as multicomponent microalloying two-phase magnesium lithium alloy composition of the invention, but prepares
It in the process without Homogenization Treatments, and is handled without subsequent ageing strengthening, tensile strength, yield strength and elongation percentage are equal
The multicomponent microalloying two-phase magnesium lithium alloy obtained far below preparation method of the invention.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of multicomponent microalloying two-phase magnesium lithium alloy, which is characterized in that be made of the element of following mass percent: Li
9.10%~9.50%, Al 1.80%~2.20%, Zn 1.20%~1.50%, Zr 0.20%~1.00%, Ca
0.10%~0.50%, Ag 0.10%~0.50%, light rare earth elements 0.10%~0.50%, heavy rare earth element 0.10%~
2.00%, remaining is Mg and impurity element.
2. multicomponent microalloying two-phase magnesium lithium alloy according to claim 1, it is characterised in that: the matter of the impurity element
Amount percentage is 0-0.15%.
3. multicomponent microalloying two-phase magnesium lithium alloy according to claim 1, it is characterised in that: the light rare earth elements is
One of La, Ce, Nd, Sm or a variety of.
4. multicomponent microalloying two-phase magnesium lithium alloy according to claim 1, it is characterised in that: the heavy rare earth element is
One of Gd, Tb, Er, Tm, Yb, Y or a variety of.
5. multicomponent microalloying two-phase magnesium lithium alloy according to claim 1, which is characterized in that by following mass percent
Element composition: Li 9.20%~9.30%, Al 1.90%~2.10%, Zn 1.30%~1.40%, Zr 0.50%~
0.80%, Ca 0.20%~0.40%, Ag 0.10%~0.30%, light rare earth elements 0.20%~0.30%, heavy rare earth member
Element 1.00%~1.50%, remaining is Mg and impurity element.
6. a kind of method for preparing multicomponent microalloying two-phase magnesium lithium alloy a method as claimed in any one of claims 1 to 5, feature exist
In, comprising the following steps:
S1. raw material is taken by selected mass percent；
S2. raw material described in step S1 is mixed, then carries out melting, refining obtains melt；
S3. it is cast using melt described in step S2, obtains ingot casting；
S4. Homogenization Treatments are carried out to ingot casting described in step S3, and is cut into blank；
S5. blank described in step S4 is formed to obtain molded part；
S6. ageing strengthening is carried out to molded part described in step S5 to handle to obtain the multicomponent microalloying two-phase magnesium lithium alloy.
7. the method according to claim 6 for preparing multicomponent microalloying two-phase magnesium lithium alloy, which is characterized in that step S1
Specifically: pure magnesium ingot, fine aluminium ingot, pure zinc ingot, fine silver powder, Mg-Li intermediate alloy, Mg-Zr are taken according to selected mass percent
Intermediate alloy, Mg-Ca intermediate alloy, Mg- rare earth intermediate alloy.
8. the method according to claim 6 for preparing multicomponent microalloying two-phase magnesium lithium alloy, which is characterized in that step S2
Specifically: the raw material is mixed, is then heated under protective atmosphere in 700-740 DEG C, melting 40-60min, and refine 20-
40min is warming up to 740-760 DEG C after refining, and stands 30-40min and obtain melt.
9. the method according to claim 6 for preparing multicomponent microalloying two-phase magnesium lithium alloy, which is characterized in that step S4
Described in Homogenization Treatments specifically: the ingot casting is warming up to 280~320 DEG C and keeps the temperature 1-16h, then heats to 360-
400 DEG C and keep the temperature 2-24h.
10. the method according to claim 6 for preparing multicomponent microalloying two-phase magnesium lithium alloy, which is characterized in that step
Molding mode described in S5 is extrusion forming or roll forming, and the extruding temperature of the extrusion forming is 150-400 DEG C, is squeezed
Than for 10:1-60:1, extrusion speed 0.1-40m/min；The start rolling temperature of the roll forming is 350 DEG C, and finishing temperature is
150~250 DEG C, reduction in pass is 5%~20%, and total reduction is 50%~90%, and mill speed is 0.5~40m/min.
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| CN111235413A (en) * | 2020-02-08 | 2020-06-05 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
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