CN109338132B - Preparation method of rare earth wrought magnesium alloy blank - Google Patents

Preparation method of rare earth wrought magnesium alloy blank Download PDF

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Publication number
CN109338132B
CN109338132B CN201811112019.XA CN201811112019A CN109338132B CN 109338132 B CN109338132 B CN 109338132B CN 201811112019 A CN201811112019 A CN 201811112019A CN 109338132 B CN109338132 B CN 109338132B
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alloy
rare earth
heat treatment
magnesium alloy
wrought magnesium
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CN109338132A (en
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胡志
殷正
褚晨亮
闫洪
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Nanchang University
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Nanchang University
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C23/00Alloys based on magnesium
    • C22C23/02Alloys based on magnesium with aluminium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Abstract

A method for preparing a rare earth wrought magnesium alloy blank comprises the steps of putting Mg-Al-Zn alloy into a crucible for melting, adding small block-shaped Mg-20% Gd wrapped by aluminum foil paper, preserving heat for 10min, cooling to 700 ℃, cooling at 15-20 ℃/s, and solidifying, wherein the weight percentage of each component of the alloy is as follows: 2.0-5.0% of aluminum, 0.8-1.2% of zinc, 2.0-2.5% of gadolinium, 0.3-0.5% of manganese and the balance of magnesium; and (3) putting the alloy ingot into a heat treatment furnace, carrying out isothermal heat treatment at 595-615 ℃ for 20-40 min in a protective gas atmosphere, and taking out for water quenching. The invention can make the layer (Mg, Al)3Transformation of Gd phase to granular Al2The Gd phase obviously improves the plasticity and the ductility of the rare earth wrought magnesium alloy. Al (Al)2The Gd particles can be used as heterogeneous cores of alpha-Mg crystal grains, so that the rare earth wrought magnesium alloy blank has fine and round structure and good plasticity, and completely meets the thixoforming requirement.

Description

Preparation method of rare earth wrought magnesium alloy blank
Technical Field
The present invention belongs to the field of alloy and non-ferrous metal treating technology.
Background
The magnesium-aluminum (Mg-Al) alloy is the most widely applied alloy in magnesium alloys, has obvious excellent comprehensive performance, and contains a small amount of Mn, thereby being beneficial to eliminating the adverse effect of harmful elements and improving the corrosion resistance. However, the alloy has low mechanical properties and poor heat resistance and plastic workability.
The emergence of a novel semi-solid forming process provides a new way for solving the obstacles faced by the traditional solidification and plastic forming, and is considered as the most promising material forming method in the 21 st century. How to obtain a good semi-solid non-dendritic structure is the basis and the key of the semi-solid forming technology. The pipe kernel national teaching of the university of northeast and the like provides a wave-shaped inclined plate vibration semi-solid forming technology; the professor Yangxiangjie of Nanchang university proposes a rotary inclined cylinder type packaging technology; a coiled pipe channel winding casting method is developed by professor of Mao Weimin, Beijing university of science and technology; the Beijing general institute of nonferrous metals developed a damping cooling tube method. The semi-solid isothermal heat treatment is a new method developed in recent years, the non-dendritic ingot material for semi-solid forming prepared by the method can be directly changed from the as-cast ingot material into the non-dendritic ingot material in the secondary heating process, the special procedure required for manufacturing semi-solid slurry is omitted, and the method is widely used for preparing the semi-solid blank material for casting the magnesium alloy, but the method is still in the exploration stage for the preparation research of the deformed magnesium alloy blank material.
The rare earth element has unique extra-nuclear electron arrangement, so that the rare earth element can generate special effect in the magnesium alloy, wherein the rare earth element Gd has obvious modification capability on the Mg-Al alloy, and the rare earth element Gd can refine the AZ31 cast structure by Gu Song Wei and the like of the university of the continuousness engineering. Meanwhile, the documents [ B, Pourbahari, M, Emamy, H, Mirzadeh, "Synergistic effect of Al and Gd on enhancement of mechanical properties of magnesium alloys", growth in Natural Science: Materials International, 27 (2017) 228-]It is proposed that after Gd element is added, Al is formed2The Gd phase forms another layer (Mg, Al)3The Gd phase, which is a lamellar phase, not only influences the plastic forming capability of the deformed magnesium alloy, but also causes the generation of high stress concentration points, and provides a proper position for the nucleation and the propagation of microcracks. Thus, (Mg, Al)3The formation of Gd phase results in a decrease in the properties of wrought magnesium alloys.
Disclosure of Invention
The invention aims to provide a method for preparing a rare earth wrought magnesium alloy blank, which is layered (Mg, Al)3Transformation of Gd phase to granular Al2The plasticity and the ductility of the rare earth wrought magnesium alloy are obviously improved by the Gd phase.
The invention is realized by the following technical scheme.
The invention relates to a preparation method of a rare earth wrought magnesium alloy blank, which is characterized by comprising the following steps of putting Mg-Al-Zn alloy into a crucible with a furnace temperature of 740-760 ℃ for heating until the Mg-Al-Zn alloy is molten, adding a small blocky Mg-20% Gd intermediate alloy wrapped by aluminum foil paper, keeping the temperature for 10 minutes, cooling an alloy melt to 700 ℃, cooling at a cooling speed of 15-20 ℃/s, and solidifying to obtain an alloy ingot, wherein the alloy comprises the following components in percentage by weight: 2.0-5.0% of aluminum, 0.8-1.2% of zinc, 2.0-2.5% of gadolinium, 0.3-0.5% of manganese and the balance of magnesium; and putting the obtained alloy ingot into a heat treatment furnace, carrying out isothermal heat treatment in a protective gas atmosphere, wherein the isothermal heat treatment temperature is 595-615 ℃, the heat preservation time is 20-40 minutes, taking out, and carrying out water quenching to obtain a fine spherical semi-solid rare earth magnesium alloy blank.
The invention has the technical effects that: the method for preparing the wrought magnesium alloy blank can ensure that the wrought magnesium alloy blank is layered (Mg, Al)3Transformation of Gd phase to granular Al2The plasticity and the ductility of the rare earth wrought magnesium alloy are obviously improved by the Gd phase. At the same time, Al2The Gd particles can be used as heterogeneous cores of alpha-Mg crystal grains, so that the finally obtained rare earth wrought magnesium alloy blank has fine and round tissue and good plasticity, and completely meets the requirement of thixoforming.
Drawings
FIG. 1 is an optical microstructure of an alloy ingot prepared under the conditions of example 2.
FIG. 2 is an SEM microstructure of an alloy ingot prepared under the conditions of example 2.
FIG. 3 is an optical microstructure of a wrought magnesium alloy billet prepared under the conditions of example 2
FIG. 4 is an SEM microstructure of a wrought magnesium alloy blank prepared under the conditions of example 2.
Detailed Description
The invention will be further illustrated by the following examples.
Example 1: in the embodiment, Mg-Al-Zn alloy (the mass percent of Al is 2%, the mass percent of Zn is 0.8%, and the balance is Mg) is heated to 740 ℃, after the alloy is completely melted, a small block-shaped Mg-20% Gd intermediate alloy wrapped by aluminum foil paper is added, wherein the mass fraction of rare earth element Gd accounts for 2.0% of the melt, the alloy melt is cooled to 700 ℃ after heat preservation is carried out for 10 minutes, then the alloy melt is cooled at a cooling speed of 15 ℃, and an alloy ingot is obtained after solidification; and carrying out isothermal heat treatment on the obtained alloy ingot, wherein the isothermal heat treatment temperature is 595 ℃, the heat preservation time is 40 minutes, taking out and carrying out water quenching to obtain the rare earth magnesium alloy semi-solid blank.
Example 2: in the embodiment, Mg-Al-Zn alloy (the mass percent of Al is 3%, the mass percent of Zn is 1%, and the balance is Mg) is heated to 750 ℃, after the alloy is completely melted, a small blocky Mg-20% Gd intermediate alloy wrapped by aluminum foil paper is added, wherein the mass fraction of rare earth element Gd in the molten liquid is 2.0%, the alloy melt is cooled to 700 ℃ after heat preservation is carried out for 10 minutes, then the alloy melt is cooled at a cooling speed of 20 ℃, and an alloy ingot is obtained after solidification; and carrying out isothermal heat treatment on the obtained alloy ingot, wherein the isothermal heat treatment temperature is 605 ℃, the heat preservation time is 30 minutes, and taking out for water quenching to obtain the rare earth magnesium alloy semi-solid blank.
Example 3: in the embodiment, Mg-Al-Zn alloy (Al is 4% by mass, Zn is 1.2% by mass, and the balance is Mg) is heated to 760 ℃, after the alloy is completely melted, a small block-shaped Mg-20% Gd intermediate alloy wrapped by aluminum foil paper is added, wherein the rare earth element Gd accounts for 2.5% by mass of the molten liquid, the alloy melt is cooled to 700 ℃ after heat preservation is carried out for 10 minutes, then the alloy melt is cooled at a cooling speed of 15 ℃, and an alloy ingot is obtained after solidification; and carrying out isothermal heat treatment on the obtained alloy ingot, wherein the isothermal heat treatment temperature is 605 ℃, the heat preservation time is 30 minutes, and taking out for water quenching to obtain the rare earth magnesium alloy semi-solid blank.
Example 4: in the embodiment, Mg-Al-Zn alloy (5 mass percent of Al, 1 mass percent of Zn and the balance of Mg) is heated to 750 ℃, after the alloy is completely melted, a small blocky Mg-20% Gd intermediate alloy wrapped by aluminum foil paper is added, wherein the mass fraction of rare earth element Gd in the molten liquid is 2.5%, the alloy melt is cooled to 700 ℃ after heat preservation is carried out for 10 minutes, then the alloy melt is cooled at a cooling speed of 20 ℃, and an alloy ingot is obtained after solidification; and carrying out isothermal heat treatment on the obtained alloy ingot, wherein the isothermal heat treatment temperature is 615 ℃, the heat preservation time is 20 minutes, and taking out for water quenching to obtain the rare earth magnesium alloy semi-solid blank.
The alloy ingot prepared in example 2 and the wrought magnesium alloy ingot subjected to isothermal heat treatment were sampled, and the microstructure of the alloy was observed under an optical microscope after being polished, polished and corroded, as shown in fig. 1 and 3.The alloy ingot prepared in example 2 and the wrought magnesium alloy blank subjected to isothermal heat treatment were sampled and observed under a scanning electron microscope for rare earth phase distribution in the alloy, as shown in fig. 2 and fig. 4. As can be seen from the figure, the isothermal heat treatment process can make the (Mg, Al) layered3Gd is converted into granular Al2Gd. Meanwhile, part of Al2Gd particles are used as heterogeneous cores of alpha-Mg grains, and the rest Al2The Gd particles are uniformly distributed, so that the finally obtained rare earth wrought magnesium alloy blank has fine and round tissue and good plasticity, and completely meets the requirement of thixoforming.

Claims (1)

1. A preparation method of a rare earth wrought magnesium alloy blank is characterized by placing Mg-Al-Zn alloy into a crucible with a furnace temperature of 740-760 ℃ to be heated to be molten, adding a small blocky Mg-20% Gd intermediate alloy wrapped by aluminum foil paper, keeping the temperature for 10 minutes, cooling an alloy melt to 700 ℃, then cooling at a cooling speed of 15-20 ℃/s, and obtaining an alloy ingot after solidification, wherein the alloy comprises the following components in percentage by weight: 2.0-5.0% of aluminum, 0.8-1.2% of zinc, 2.0-2.5% of gadolinium, 0.3-0.5% of manganese and the balance of magnesium; and putting the obtained alloy ingot into a heat treatment furnace, carrying out isothermal heat treatment in a protective gas atmosphere, wherein the isothermal heat treatment temperature is 595-615 ℃, the heat preservation time is 20-40 minutes, taking out, and carrying out water quenching to obtain a fine spherical semi-solid rare earth magnesium alloy blank.
CN201811112019.XA 2018-09-25 2018-09-25 Preparation method of rare earth wrought magnesium alloy blank Active CN109338132B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006070334A (en) * 2004-09-03 2006-03-16 National Institute Of Advanced Industrial & Technology Mg-Co BASED ALLOY AND ITS MANUFACTURING METHOD
CN103436758A (en) * 2013-08-05 2013-12-11 南昌大学 Preparation method of magnesium-aluminum-zinc-yttrium magnesium alloy semisolid slurry
CN105908040A (en) * 2016-06-22 2016-08-31 南昌航空大学 Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006070334A (en) * 2004-09-03 2006-03-16 National Institute Of Advanced Industrial & Technology Mg-Co BASED ALLOY AND ITS MANUFACTURING METHOD
CN103436758A (en) * 2013-08-05 2013-12-11 南昌大学 Preparation method of magnesium-aluminum-zinc-yttrium magnesium alloy semisolid slurry
CN105908040A (en) * 2016-06-22 2016-08-31 南昌航空大学 Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Evolution and distribution of A12Sm phase in as-extruded AZ61-xSm magnesium alloys during semi-solid isothermal heat-treatment;Chen-Lang CHU et al.;《Transactions of Nonferrous Metals Society of China》;20180731;第28卷(第7期);第1312页 *

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