CN101302603A - Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy and preparation thereof - Google Patents

Abstract

The invention provides a magnesium-lithium based Mg-Li-Al-Cu-Zn bulk amorphous alloy and a method for preparing the same. The method comprises the following: step one, in an intermediate-frequency vacuum inductive melting furnace in argon atmosphere, Mg and Li are mixed evenly and melted according to the mass ratio of 7 to 3, and then a binary alloy ingot can be obtained after the Mg and the Li are cooled; step two, the binary alloy ingot obtained in the step one is mechanically ground, and then raw materials are weighed according to different mixture ratios of nominal composition (MgLi)xAl60-xCu20Zn2, wherein the x is more than or equal to 30 and less than or equal to 35; step three, the intermediate-frequency inductive melting furnace is vacuumized and filled with argon gas with 10<-2> Pa, and then a (MgLi)xAl60-xCu20Zn20 alloy is melted under argon shield; step four, the molten-state (MgLi)xAl60-xCu20Zn20 obtained in the step three is cast into a copper mold type cavity to be made into a bulk amorphous alloy. As a Li element is added to a magnesium alloy, the microscopic crystal structure of the alloy is changed from a hcp structure to a bcc structure, which can effectively improve the mechanical properties of the alloy; as an alloying method of adding Al and Zn elements is adopted, the mechanical properties of the Mg-Li alloy is effectively improved; and the addition of a Cu element is favorable for improving the glass forming ability (GFA) of the alloy, thereby the amorphous alloy in larger size can be prepared.

Description

A kind of Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy and preparation method thereof

(1) technical field

What the present invention relates to is a kind of alloy, particularly relates to a kind of Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy.

(2) background technology

Magnesium and alloy thereof are the lightest structural metallic materialss of widespread use on engineering up to now.Magnesium alloy has high specific tenacity and specific rigidity, wherein the Mg-Li alloy is a kind of novel magnesium alloy, it light as plastics and heavily fortified point as metal, deformability is better than other magnesium alloy, is with a wide range of applications in fields such as automobile, electronics, electrical equipment, Aeronautics and Astronautics and national defense industry.

In recent years, along with the develop rapidly of flash set technology, people have strengthened the amorphous of high-performance, less energy-consumption, nanocrystalline and composite study dynamics.Compare with traditional magnesium alloy, the intensity of amorphous magnesium alloy can improve 2～3 times, and specific tenacity also can significantly improve.Simultaneously, it also has series of advantages such as higher specific rigidity, good superplasticity and corrosion resistance nature, be a kind of novel metal structured material that has development potentiality, therefore caused people's extensive concern, become present material worker's main goal in research.At present, the magnesium-base amorphous alloy of having found mainly contains Mg-Ca, Mg-Ni, Mg-Cu, Mg-Zn, Mg-Ln and Mg-Ln-Tm (Ln: rare earth metal; Tm: transition metal) binary and ternary system such as, but the research of Mg-Li base noncrystal alloy also there is not relevant report.The excellent properties and the application prospects thereof that are had based on above-mentioned Mg-Li alloy, thereby be necessary to strengthen the dynamics of preparation of Mg-Li base amorphous alloy and performance study, obtain large-sized block amorphous alloy, make it be suitable for the engineering application.

(3) summary of the invention

The object of the present invention is to provide a kind of Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy with excellent mechanical properties, mechanical property; The present invention also aims to provide a kind of and can improve the performance of alloy, have a preparation method of the block Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy of large-size again.

The objective of the invention is to be achieved through the following technical solutions:

This is that the structural formula of non-crystaline amorphous metal is (MgLi) _xAl _60-xCu ₂₀Zn ₂₀, wherein x is that lithium accounts for the atomic percent that mass percent is 30% MgLi alloying element, 30≤x≤35.

The invention provides a kind of preparation method of above-mentioned Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy, concrete steps are as follows:

Step 1: in the intermediate frequency vacuum induction melting furnace of argon gas atmosphere, Mg and Li are mixed fusing, obtain the binary alloy ingot casting after the cooling by mass ratio 7: 3;

Step 2:, press nominal composition (MgLi) then with the binary alloy ingot casting mechanical disintegration that step 1 obtains _xAl _60-xCu ₂₀Zn ₂₀, wherein the different proportionings of 30≤x≤35 take by weighing raw material;

Step 3: medium frequency induction melting furnace is vacuumized, charge into 10 then ^-2The argon gas of Pa, melting under argon shield (MgLi) _xAl _60-xCu ₂₀Zn ₂₀Alloy;

Step 4: the molten state (MgLi) that step 3 is obtained _xAl _60-xCu ₂₀Zn ₂₀Alloy is cast in the copper mold die cavity, is prepared into bulk amorphous alloys.

Step 5: adopt X-ray diffraction method to characterize the weave construction of gained sample; Utilize the hardness value of HXS-1000Z type hardness tester instrumentation amount sample to characterize its mechanical property.

The advantage that the present invention has is:

1, the Li element adds in the magnesium alloy, and making alloy microcosmic crystalline structure is the bcc structure by the hcp structural transformation, and this will improve the mechanical property of alloy effectively;

2, adopt the alloyage process that adds Al and Zn element, improved the mechanical property of Mg-Li alloy effectively;

3, add the Cu element and help improving the amorphous formation ability (GFA) of alloy, thereby can prepare the non-crystaline amorphous metal of large-size.

(4) description of drawings

Fig. 1 is the XRD figure of the Mg-Li-Al-Cu-Zn Al-Cu-Zn block amorphous alloy of the present invention's proposition;

Fig. 2 is the hardness value histogram of the Mg-Li-Al-Cu-Zn Al-Cu-Zn block amorphous alloy of the present invention's proposition.

(5) embodiment

Embodiment 1

This embodiment adopts copper mold casting method successfully to prepare diameter 5mm (MgLi) ₃₅Al ₂₅Cu ₂₀Zn ₂₀Bulk amorphous alloys.

Step 1: with purity is that 99.5% industrial aluminium ingot, purity are that 99.8% high-purity copper ingot, purity are 99.99% the high-purity spelter and the magnesium lithium alloy (mass percent of lithium is 30%) of melting, by composition proportion (MgLi) ₃₅Al ₂₅Cu ₂₀Zn ₂₀Take by weighing raw material;

Step 2: earlier the above-mentioned raw material that takes by weighing is put into the crucible of medium frequency induction melting furnace, charged into 10 after then medium frequency induction melting furnace being vacuumized ^-2The argon gas of Pa, regulating voltage are warming up to 1000 ℃ of heating 1 hour, and be even until alloy melting;

Step 3: the molten metal of molten state is cast in the copper mold die cavity, thereby prepares bulk amorphous alloys;

Step 4: adopt X-ray diffraction method to characterize this bulk amorphous alloys structures of samples, as shown in Figure 1;

Step 5: utilize the hardness value of HXS-1000Z type hardness tester instrumentation amount sample, as shown in Figure 2.

Embodiment 2

This embodiment adopts copper mold casting method successfully to prepare diameter 5mm (MgLi) ₃₀Al ₃₀Cu ₂₀Zn ₂₀Bulk amorphous alloys.

Step 1: with purity is that 99.5% industrial aluminium ingot, purity are that 99.8% high-purity copper ingot, purity are 99.99% the high-purity spelter and the magnesium lithium alloy (mass percent of lithium is 30%) of melting, by composition proportion (MgLi) ₃₀Al ₃₀Cu ₂₀Zn ₂₀Take by weighing raw material;

Step 2: earlier the above-mentioned raw material that takes by weighing is put into the crucible of medium frequency induction melting furnace, charged into 10 after then medium frequency induction melting furnace being vacuumized ^-2The argon gas of Pa, regulating voltage are warming up to 1000 ℃ of heating 1 hour, and be even until alloy melting;

Step 3: the molten metal of molten state is cast in the copper mold die cavity, thereby prepares bulk amorphous alloys;

Step 4: adopt X-ray diffraction method to characterize this bulk amorphous alloys structures of samples, as shown in Figure 1;

Step 5: utilize the hardness value of HXS-1000Z type hardness tester instrumentation amount sample, as shown in Figure 2.

Claims (4)

1, a kind of Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy is characterized in that: this is that the non-crystaline amorphous metal structural formula is (MgLi) _xAl _60-xCu ₂₀Zn ₂₀, wherein x is that lithium accounts for the atomic percent that mass percent is 30% MgLi alloying element, 30≤x≤35.

2, Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy according to claim 1 is characterized in that: it is diameter 5mm (MgLi) ₃₅Al ₂₅Cu ₂₀Zn ₂₀Bulk amorphous alloys.

3, Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy according to claim 1 is characterized in that: it is diameter 5mm (MgLi) ₃₀Al ₃₀Cu ₂₀Zn ₂₀Bulk amorphous alloys.

4, a kind of preparation method of Mg-Li-based Mg-Li-Al-Cu-Zn block amorphous alloy is characterized in that:

Step 1: in the intermediate frequency vacuum induction melting furnace of argon gas atmosphere, Mg and Li are mixed fusing, obtain the binary alloy ingot casting after the cooling by mass ratio 7: 3;

Step 2:, press nominal composition (MgLi) then with the binary alloy ingot casting mechanical disintegration that step 1 obtains _xAl _60-xCu ₂₀Zn ₂₀, wherein the different proportionings of 30≤x≤35 take by weighing raw material;

Step 3: medium frequency induction melting furnace is vacuumized, charge into 10 then ^-2The argon gas of Pa, melting under argon shield (MgLi) _xAl _60-xCu ₂₀Zn ₂₀Alloy;

Step 4: the molten state (MgLi) that step 3 is obtained _xAl _60-xCu ₂₀Zn ₂₀Alloy is cast in the copper mold die cavity, is prepared into bulk amorphous alloys.

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