CN108624793B - Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof - Google Patents
Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof Download PDFInfo
- Publication number
- CN108624793B CN108624793B CN201810966108.4A CN201810966108A CN108624793B CN 108624793 B CN108624793 B CN 108624793B CN 201810966108 A CN201810966108 A CN 201810966108A CN 108624793 B CN108624793 B CN 108624793B
- Authority
- CN
- China
- Prior art keywords
- temperature
- magnesium alloy
- extrusion
- heat
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following components in percentage by mass: y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 w%, and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%. The high-strength heat-resistant magnesium alloy comprises Mg-Y-Nd-Gd-Ag-Zr, precipitation strengthening of a rare earth-containing intermetallic compound is used as a main strengthening mechanism, a non-rare earth element Ag is added, a RE-Ag fine high-temperature stable phase and a Mg-RE-Ag eutectic are formed, the newly formed phase has the characteristics of fine dispersion and high-temperature stability, and the heat treatment age hardening effect and the heat resistance of the material are obviously improved. The invention also provides a preparation method of the high-strength heat-resistant magnesium alloy containing Ag.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a high-strength heat-resistant magnesium alloy containing Ag and a preparation method thereof.
Background
In the international magnesium alloy research field, aging precipitation strengthening is an important direction for the development of high-strength magnesium alloys in recent years, and various magnesium alloys taking rare earth as a main alloying element are developed at home and abroad in the past 50 years. Based on the age hardening effect of rare earth elements added into magnesium, most heavy magnesium rare earth shows good age strengthening effect, particularly Gd and Y elements are most remarkable, but the alloy relies on Orowan mechanism that precipitated phases hinder dislocation motion to strengthen, the plasticity of the alloy is obviously reduced, and the processing performance requirement of precision manufacturing and the use requirements in the fields of aviation, rail transit and the like are difficult to meet.
Therefore, there is a need to further explore and study the strengthening and toughening matrix of multi-component alloys to meet the requirements of high strength, heat resistance and high capacity loss.
Disclosure of Invention
The invention aims to provide a high-strength heat-resistant magnesium alloy containing Ag and a preparation method thereof.
The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following components in percentage by mass:
y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 w%, and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%.
The invention provides a preparation method of a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following steps:
A) mixing pure Mg, pure Ag, Mg-Zr intermediate alloy and Mg-RE intermediate alloy according to the following mass fraction, smelting and casting;
RE ═ Y, Nd, and Gd;
y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 wt% and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%;
B) and carrying out heat treatment or extrusion on the casting to obtain the high-strength heat-resistant magnesium alloy containing Ag.
Preferably, the step a) is specifically:
(1) in CO2And SF6Under the protection of mixed gas, mixing pure Mg, pure Ag, an Mg-Zr intermediate alloy and an Mg-RE intermediate alloy in proportion, and drying at the temperature of 100-200 ℃ for 1-2 h;
the CO is2And SF6Is 99.5: 0.5;
(2) putting the dried pure Mg, pure Ag and Mg-RE intermediate alloy into a crucible, and heating along with a furnace until the pure Mg, the pure Ag and the Mg-RE intermediate alloy are completely melted, wherein the temperature is controlled to be 680-780 ℃;
(3) heating the melt to 700-740 ℃, adding the dried Mg-Zr intermediate alloy into the melt, and stirring for 5-10 minutes after the Mg-Zr intermediate alloy is completely melted;
(4) cooling the melt to 680-700 ℃, and standing for 20-40 minutes;
(5) scraping the scum on the surface of the melt, and carrying out casting molding.
Preferably, the heat treatment in step B) includes solution treatment and aging treatment in this order.
Preferably, the temperature of the solution treatment is 500-530 ℃;
the time of the solution treatment is 6-24 hours.
Preferably, the temperature of the aging treatment is 200-250 ℃;
the time of the aging treatment is 12-72 hours.
Preferably, the extrusion comprises the steps of:
and (3) homogenizing, preheating, extruding and aging the casting in sequence to obtain the Li-doped light high-strength magnesium alloy.
Preferably, the homogenization temperature is 500-530 ℃;
the homogenization time is 4-10 hours.
Preferably, the preheating temperature is 300-400 ℃;
the preheating time is 2-2.5 hours;
the extrusion ratio is (8-20): 1;
the extrusion speed is 0.01-1.0 m/min.
Preferably, the temperature of the aging treatment is 200-250 ℃;
the time of the aging treatment is 10-72 hours.
The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following components in percentage by mass: y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 w%, and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%.
The high-strength heat-resistant magnesium alloy containing rare earth Y, Nd, Gd and Ag is Mg-Y-Nd-Gd-Ag-Zr, precipitation strengthening of intermetallic compounds containing rare earth is taken as a main strengthening mechanism, a RE-Ag fine high-temperature stable phase and an Mg-RE-Ag eutectic are formed by adding non-rare earth Ag, the newly formed phase has the characteristics of fine dispersion and high-temperature stability, and the heat treatment age hardening effect and the heat resistance of the material are obviously improved. The material of the invention has excellent room temperature and high temperature mechanical properties, and has the following beneficial effects:
1. the room temperature mechanical property of the material of the invention is obviously improved: the tensile strength, the yield strength and the elongation of the material in a heat treatment state after casting respectively reach: 300-340 MPa, 230-240 MPa and 4-6%, and the tensile strength, yield strength and elongation of the material in a heat treatment state after extrusion respectively reach: 350-390 MPa, 260-280 MPa and 8-10 percent. On the premise of not increasing the total amount of rare earth, the strength performance index is improved to different degrees, better plasticity is reserved, and the engineering application is easy to realize.
2. The material of the invention has excellent high-temperature mechanical property, and the high-temperature property of the material is obviously improved after Ag is added: the tensile strength, the yield strength and the elongation of the cast heat-treated material at 250 ℃ respectively reach: 280-310 MPa, 200-220 MPa and 8-12%, wherein the tensile strength, yield strength and elongation of the extruded heat-treated material at 250 ℃ respectively reach: 330-350 MPa, 250-270 MPa and 10-16 percent, and can meet the requirements of the fields of aerospace, missile military industry, rail transit and the like on the mechanical properties of the light structural material in a high-temperature environment.
3. The material takes precipitation strengthening of the intermetallic compound containing rare earth as a main strengthening mechanism, improves the age hardening effect by adding the non-rare earth element Ag, and optimizes the diversified components of the alloy. The rare earth content in the alloy is not higher than 10 wt.%, the production process is simple and easy to implement, and the process performance is stable and good. The plasticity is good, so that the processing performance of the alloy is obviously improved, the practicability is enhanced, and the alloy has good application prospects in aerospace and other high-technology industries.
4. The material can adopt casting molding and extrusion molding processes, can meet the preparation requirements of different occasions, is beneficial to industrial application, simplifies the alloy types and reduces the technical difficulty and the production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a metallographic view of a magnesium alloy in example 1 of the present invention;
FIG. 2 is a metallographic graph of a magnesium alloy according to example 5 of the present invention.
Detailed Description
The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following components in percentage by mass:
y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 w%, and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%.
In the invention, the Ag-containing high-strength heat-resistant magnesium alloy may be formulated as follows:
y: 4.5 wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.1 wt%, Zr: 0.5 wt%, the balance being Mg;
y: 6.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.5 wt%, Zr: 0.5 wt%, the balance being Mg;
y: 4.5 wt%, Nd: 4.0wt%, Gd: 1.5wt%, Ag: 1.0 wt%, Zr: 0.5 wt%, the balance being Mg;
y: 4.5 wt%, Nd: 1.5wt%, Gd: 4.0wt%, Ag: 1.5wt%, Zr: 0.5 wt%, and the balance being Mg.
The invention also provides a preparation method of the high-strength heat-resistant magnesium alloy containing Ag, which comprises the following steps:
A) mixing pure Mg, pure Ag, Mg-Zr intermediate alloy and Mg-RE intermediate alloy according to the following mass fraction, smelting and casting;
RE ═ Y, Nd, and Gd;
y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 wt% and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%;
B) and carrying out heat treatment or extrusion on the casting to obtain the high-strength heat-resistant magnesium alloy containing Ag.
According to the invention, pure Mg, pure Ag, an Mg-Zr intermediate alloy and an Mg-RE intermediate alloy are preferably proportioned according to a proportion and dried at the drying temperature of 100-200 ℃ for 1-2 h;
(2) and (3) putting the dried pure Mg, pure Ag and Mg-RE intermediate alloy into a crucible, and heating along with the furnace until the pure Mg, the pure Ag and the Mg-RE intermediate alloy are completely melted, wherein the temperature is controlled to be 680-780 ℃.
(3) And heating the melt to 700-740 ℃, adding the dried Mg-Zr intermediate alloy into the melt, and stirring for 5-10 minutes after the Mg-Zr intermediate alloy is completely melted.
(4) And cooling the melt to 680-700 ℃, and standing for 20-40 minutes.
(5) Scraping the scum on the surface of the melt, and carrying out casting molding.
In the above step, the melt is always in CO2And SF6Under the protection of mixed gas, the CO2And SF6Is 99.5: 0.5.
in the invention, Re in the Mg-RE alloy is Y, Nd and Gd, and RE in the Mg-RE alloy accounts for 20-30 wt% of all raw materials.
After the smelting is finished, the obtained melt material can be cast and molded, and can also be cast into a blank to be extruded and molded.
Casting and forming:
and sequentially carrying out solid solution treatment and aging treatment on the casting to obtain the high-strength heat-resistant magnesium alloy containing Ag.
The temperature of the solution treatment is preferably 500-530 ℃; the time of the solution treatment is preferably 6 to 24 hours, and more preferably 12 to 18 hours; air cooling to room temperature after the solution treatment;
the temperature of the aging treatment is preferably 200-250 ℃; the time of the aging treatment is preferably 12-72 hours, and more preferably 24-36 hours; and air cooling to room temperature after aging treatment.
Extrusion molding:
and sequentially carrying out extrusion blank preparation, extrusion section preparation and aging treatment on the casting to obtain the high-strength heat-resistant magnesium alloy containing Ag.
The extrusion blank is prepared by homogenization treatment, the temperature of the homogenization treatment is 500-530 ℃, and the time of the homogenization treatment is 4-10 hours, and more preferably 5-8 hours.
The preparation of the extruded section comprises preheating and extruding, wherein the obtained extruded blank and an extrusion die are preheated for 2-2.5 hours at the temperature of 300-400 ℃, and then are extruded;
the extrusion ratio of the extrusion is preferably (8-20): 1, more preferably (10-15): 1; the extrusion speed of the extrusion is preferably 0.01-1.0 m/min, more preferably 0.1-0.8 m/min, and most preferably 0.5-0.6 m/min.
The aging treatment temperature is preferably 200-250 ℃; the time of the aging treatment is preferably 10-72 hours, and more preferably 24-36 hours; and air cooling to room temperature after aging treatment.
The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which comprises the following components in percentage by mass: y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 w%, and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%. The high-strength heat-resistant magnesium alloy containing rare earth Y, Nd, Gd and Ag is Mg-Y-Nd-Gd-Ag-Zr, precipitation strengthening of intermetallic compounds containing rare earth is taken as a main strengthening mechanism, a RE-Ag fine high-temperature stable phase and an Mg-RE-Ag eutectic are formed by adding non-rare earth Ag, the newly formed phase has the characteristics of fine dispersion and high-temperature stability, and the heat treatment age hardening effect and the heat resistance of the material are obviously improved. The material of the invention has excellent mechanical properties at room temperature and high temperature.
In order to further illustrate the present invention, the following examples are provided to describe the high strength heat resistant magnesium alloy containing Ag and the method for preparing the same in detail, but should not be construed as limiting the scope of the present invention.
Example 1
The high-strength heat-resistant magnesium alloy comprises the following components in percentage by mass: y: 4.5 wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.1 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
The casting preparation method of the high-strength heat-resistant magnesium alloy comprises the following steps:
(1) mixing raw materials of pure Mg, pure Ag, Mg-Zr intermediate alloy and Mg-RE (20 wt.%) intermediate alloy in proportion, and drying at 200 deg.C for 2 h.
(2) During the preparation process, the melt is always CO2And SF6Under the protection of mixed gas, CO2And SF6In a ratio of 99.5: 0.5.
(3) and (3) putting the dried pure Mg, pure Ag and Mg-RE (20 wt.%) intermediate alloy into a crucible, and heating along with the furnace until the intermediate alloy is completely melted, wherein the temperature is controlled to be 780 ℃.
(4) And cooling the melt to 740 ℃, adding the dried Mg-Zr intermediate alloy into the magnesium solution, and stirring for 10 minutes after the Mg-Zr intermediate alloy is completely melted.
(5) And cooling the melt to 700 ℃, and standing for 30 minutes.
(6) And scraping scum on the surface of the melt to perform casting operation.
(7) Solution treatment: the casting was heat treated at 500 ℃ for 6h and then air cooled to room temperature.
(8) Aging treatment: the castings were heat treated at 200 ℃ for 72h and then air cooled to room temperature.
Example 2
The present embodiment 2 differs from embodiment 1 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 6.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.5 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Solution treatment: the castings were heat treated at 510 ℃ for 12h and then air cooled to room temperature. Aging treatment: the castings were heat treated at 225 ℃ for 48h and then air cooled to room temperature.
Example 3
The present embodiment 3 differs from embodiment 1 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 4.5 wt%, Nd: 4.0wt%, Gd: 1.5wt%, Ag: 1.0 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Solution treatment: the castings were heat treated at 520 ℃ for 18h and then air cooled to room temperature. Aging treatment: the casting was heat treated at 250 ℃ for 24h and then air cooled to room temperature.
Example 4
This example 4 differs from example 1 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 4.5 wt%, Nd: 1.5wt%, Gd: 4.0wt%, Ag: 1.5wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Solution treatment: the casting was heat treated at 530 ℃ for 24h and then air cooled to room temperature. Aging treatment: the castings were heat treated at 250 ℃ for 12h and then air cooled to room temperature.
Example 5
The high-strength heat-resistant magnesium alloy comprises the following components in percentage by mass: y: 4.5 wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.1 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
The extrusion forming preparation of the high-strength heat-resistant magnesium alloy comprises the following steps:
(1) mixing raw materials of pure Mg, pure Ag, Mg-Zr intermediate alloy and Mg-RE (20 wt.%) intermediate alloy in proportion, and drying at 200 deg.C for 2 h.
(2) During the preparation process, the melt is always CO2And SF6Under the protection of mixed gas, CO2And SF6In a ratio of 99.5: 0.5.
(3) and (3) putting the dried pure Mg, pure Ag and Mg-RE (20 wt.%) intermediate alloy into a crucible, and heating along with the furnace until the intermediate alloy is completely melted, wherein the temperature is controlled to be 780 ℃.
(4) And cooling the melt to 740 ℃, adding the dried Mg-Zr intermediate alloy into the magnesium solution, and stirring for 10 minutes after the Mg-Zr intermediate alloy is completely melted.
(5) And cooling the melt to 700 ℃, and standing for 30 minutes.
(6) And scraping scum on the surface of the melt to perform casting operation.
(7) Preparing an extrusion blank: homogenizing the magnesium alloy cast blank at 515 deg.c for 7 hr and processing into extruded blank.
(8) Preparing an extruded section: preheating the extrusion blank and an extrusion die for 2h at 350 ℃, wherein the extrusion ratio is 16:1, the extrusion speed is 0.3m/min, and preparing the extrusion section through plastic deformation.
(9) Aging treatment: the extruded profile was heat treated at 200 ℃ for 72 h.
Example 6
The present embodiment 6 differs from embodiment 5 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 6.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.5 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Aging treatment: the extruded profile was heat treated at 225 ℃ for 48h and then air cooled to room temperature.
Example 7
This example 7 differs from example 5 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 4.5 wt%, Nd: 4.0wt%, Gd: 1.5wt%, Ag: 1.0 wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Aging treatment: the extruded profile was heat treated at 250 ℃ for 24h and then air cooled to room temperature.
Example 8
This example 8 differs from example 5 in that: the high-strength heat-resistant magnesium alloy consists of the following components in percentage by mass: y: 4.5 wt%, Nd: 1.5wt%, Gd: 4.0wt%, Ag: 1.5wt%, Zr: 0.5 wt%, and the balance of Mg and inevitable impurities.
Aging treatment: the extruded profile was heat treated at 250 ℃ for 12h and then air cooled to room temperature.
The magnesium alloy rods of the above examples 1 to 8 were subjected to tensile property tests at room temperature and high temperature, and the test results are shown in tables 1 and 2.
TABLE 1 Room temperature mechanical properties of the high strength heat resistant magnesium alloy of the present invention
| Serial number | State of material | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| Example 1 | Post-casting heat treatment | 340 | 240 | 4 |
| Example 2 | Post-casting heat treatment | 320 | 235 | 5.5 |
| Example 3 | Post-casting heat treatment | 325 | 235 | 4 |
| Example 4 | Post-casting heat treatment | 315 | 230 | 6 |
| Example 5 | Post-extrusion heat treatment | 390 | 280 | 8 |
| Example 6 | Post-extrusion heat treatment | 375 | 270 | 8 |
| Example 7 | Post-extrusion heat treatment | 380 | 270 | 8.5 |
| Example 8 | Post-extrusion heat treatment | 365 | 265 | 10 |
| Comparative example 1 | Post-casting heat treatment | 275 | 165 | 4 |
| Comparative example 2 | Post-extrusion heat treatment | 330 | 195 | 6 |
TABLE 2 mechanical properties of the high-strength heat-resistant magnesium alloy of the present invention at 250 deg.C
| Serial number | State of material | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| Example 1 | Post-casting heat treatment | 310 | 220 | 8 |
| Example 2 | Post-casting heat treatment | 305 | 205 | 10.5 |
| Example 3 | Post-casting heat treatment | 300 | 215 | 10 |
| Example 4 | Post-casting heat treatment | 288 | 205 | 12 |
| Example 5 | Post-extrusion heat treatment | 350 | 270 | 10 |
| Example 6 | Post-extrusion heat treatment | 335 | 260 | 15 |
| Example 7 | Post-extrusion heat treatment | 340 | 260 | 12 |
| Example 8 | Post-extrusion heat treatment | 330 | 255 | 16 |
| Comparative example 1 | Post-casting heat treatment | 245 | 140 | 8 |
| Comparative example 2 | Post-extrusion heat treatment | 265 | 160 | 11 |
Note: comparative example 1 is an as-cast WE43 magnesium alloy and comparative example 2 is an extruded WE43 magnesium alloy.
As can be seen from the above table, the alloy of the invention has excellent room temperature and high temperature mechanical properties, and can meet the application requirements of magnesium alloy in national defense and military industry, aerospace, automobile, rail transit and other high-technology industries. The metallographic photograph of the microstructure of the magnesium alloy shows that the main strengthening mechanism of the alloy is aging precipitation strengthening, a RE-Ag fine high-temperature stable phase and a Mg-RE-Ag eutectic are formed by adding a non-rare earth element Ag, the newly formed phase has the characteristics of fine dispersion and high-temperature stability, the structure of the alloy is fine and uniform, and a fine high-temperature stable second phase is dispersed and distributed in a matrix, so that the dislocation slippage of a basal plane can be effectively hindered, and the strength of the alloy under the conditions of room temperature and high temperature is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A preparation method of a high-strength heat-resistant magnesium alloy containing Ag comprises the following steps:
(A) in CO2And SF6Under the protection of mixed gas, mixing pure Mg, pure Ag, an Mg-Zr intermediate alloy and an Mg-RE intermediate alloy in proportion, and drying at the temperature of 100-200 ℃ for 1-2 h;
the CO is2And SF6Is 99.5: 0.5;
(B) putting the dried pure Mg, pure Ag and Mg-RE intermediate alloy into a crucible, and heating along with a furnace until the pure Mg, the pure Ag and the Mg-RE intermediate alloy are completely melted, wherein the temperature is controlled to be 680-780 ℃;
(C) heating the melt to 700-740 ℃, adding the dried Mg-Zr intermediate alloy into the melt, and stirring for 5-10 minutes after the Mg-Zr intermediate alloy is completely melted;
(D) cooling the melt to 680-700 ℃, and standing for 20-40 minutes;
(E) scraping scum on the surface of the melt, and casting and molding;
RE = Y, Nd and Gd;
y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Ag: 0.1 to 1.5wt%, Zr: 0.15-1.5 wt% and the balance of Mg, wherein the total amount of rare earth elements is not more than 10 wt%;
F) carrying out heat treatment or extrusion on the casting to obtain the high-strength heat-resistant magnesium alloy containing Ag;
the heat treatment in the step F) sequentially comprises solution treatment and aging treatment,
the temperature of the solution treatment is 500-530 ℃; the time of the solution treatment is 6-24 hours; the temperature of aging treatment in the heat treatment is 200-250 ℃; the time of the aging treatment of the heat treatment is 12-72 hours;
the extrusion comprises the following steps:
homogenizing, preheating, extruding and aging the casting in sequence to obtain the Ag-doped light high-strength magnesium alloy;
the temperature of aging treatment in extrusion is 200-250 ℃; the time of aging treatment in extrusion is 10-72 hours.
2. The method according to claim 1, wherein the homogenization temperature is 500 to 530 ℃;
the homogenization time is 4-10 hours.
3. The preparation method according to claim 1, wherein the temperature of the preheating is 300-400 ℃;
the preheating time is 2-2.5 hours;
the extrusion ratio is (8-20): 1;
the extrusion speed is 0.01-1.0 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810966108.4A CN108624793B (en) | 2018-08-23 | 2018-08-23 | Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810966108.4A CN108624793B (en) | 2018-08-23 | 2018-08-23 | Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108624793A CN108624793A (en) | 2018-10-09 |
| CN108624793B true CN108624793B (en) | 2020-08-25 |
Family
ID=63708947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810966108.4A Active CN108624793B (en) | 2018-08-23 | 2018-08-23 | Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108624793B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161769B (en) * | 2018-10-30 | 2022-11-22 | 北京科技大学 | Functional rapidly-soluble rare earth magnesium alloy material and preparation method thereof |
| CN112779446B (en) * | 2020-12-26 | 2022-07-15 | 中国科学院长春应用化学研究所 | Multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof |
| CN113737071B (en) * | 2021-09-03 | 2022-08-26 | 湖南稀土金属材料研究院有限责任公司 | Heat-resistant magnesium alloy and preparation method and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651694A (en) * | 2015-01-30 | 2015-05-27 | 上海交通大学 | Magnesium alloy and preparation method and application thereof |
| CN105624504A (en) * | 2016-02-03 | 2016-06-01 | 中南大学 | Heat-resisting rare earth magnesium alloy and thermal treatment process for uneven-wall-thickness casting of heat-resisting rare earth magnesium alloy |
| CN106086563A (en) * | 2016-08-05 | 2016-11-09 | 沈阳明腾科技有限公司 | A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof |
| CN106367649A (en) * | 2016-09-30 | 2017-02-01 | 肖旅 | Magnesium alloy easy to prepare and plastically form and component manufacturing method thereof |
| CN107858575A (en) * | 2017-11-08 | 2018-03-30 | 中国兵器科学研究院宁波分院 | A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004085689A1 (en) * | 2003-03-25 | 2004-10-07 | Yoshihito Kawamura | Magnesium alloy of high strength and high toughness and method for production thereof |
| GB0323855D0 (en) * | 2003-10-10 | 2003-11-12 | Magnesium Elektron Ltd | Castable magnesium alloys |
-
2018
- 2018-08-23 CN CN201810966108.4A patent/CN108624793B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651694A (en) * | 2015-01-30 | 2015-05-27 | 上海交通大学 | Magnesium alloy and preparation method and application thereof |
| CN105624504A (en) * | 2016-02-03 | 2016-06-01 | 中南大学 | Heat-resisting rare earth magnesium alloy and thermal treatment process for uneven-wall-thickness casting of heat-resisting rare earth magnesium alloy |
| CN106086563A (en) * | 2016-08-05 | 2016-11-09 | 沈阳明腾科技有限公司 | A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof |
| CN106367649A (en) * | 2016-09-30 | 2017-02-01 | 肖旅 | Magnesium alloy easy to prepare and plastically form and component manufacturing method thereof |
| CN107858575A (en) * | 2017-11-08 | 2018-03-30 | 中国兵器科学研究院宁波分院 | A kind of high-strength temperature-resistant casting magnesium alloy material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108624793A (en) | 2018-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109022983B (en) | Sc-containing high-strength high-toughness magnesium alloy and preparation method thereof | |
| CN108774703B (en) | Li-containing light high-strength magnesium alloy and preparation method thereof | |
| CN110396629B (en) | 800 MPa-grade aluminum alloy extruded section and preparation method thereof | |
| CN108624793B (en) | Ag-containing high-strength heat-resistant magnesium alloy and preparation method thereof | |
| CN110669967A (en) | Rapid-extrusion high-strength wrought aluminum alloy and preparation method thereof | |
| CN110885940A (en) | Rare earth aluminum alloy material and preparation method thereof | |
| CN112410632B (en) | Mg-Gd-Y-Nd high-strength rare earth magnesium alloy and preparation method thereof | |
| CN111101038A (en) | Multi-element heat-resistant aluminum alloy and preparation method thereof | |
| CN111424200B (en) | High-strength high-heat-resistance low-scandium-silver-added Al-Cu-Mg alloy and heat treatment process thereof | |
| CN104032195A (en) | Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof | |
| CN111020309A (en) | High-strength wrought aluminum alloy containing rare earth samarium and preparation method thereof | |
| CN114086040A (en) | Aluminum-magnesium-silicon-scandium-zirconium alloy and preparation method thereof | |
| CN110885941B (en) | High-toughness aluminum alloy material and preparation method thereof | |
| CN113444903A (en) | High-gadolinium rare earth magnesium alloy bar and preparation method thereof | |
| CN115094278A (en) | 6-series aluminum alloy material with good thermal stability and preparation method thereof | |
| CN113403508A (en) | Heat treatment process for spray-formed high-silicon wear-resistant aluminum alloy | |
| WO2020052129A1 (en) | Rare-earth aluminum alloy material having high ductility and high strength and preparation method therefor | |
| CN114525421B (en) | Magnesium alloy and preparation method and application thereof | |
| CN111926226A (en) | High-strength plastic aluminum alloy and preparation method thereof | |
| CN109182865B (en) | High-strength rare earth-magnesium alloy material and preparation method thereof | |
| CN116397139A (en) | High-strength high-toughness aluminum alloy for vehicle body and preparation method thereof | |
| JPS60234936A (en) | Formed material with superior strength at high temperature made of material of aluminum alloy solidified by rapid | |
| CN114686735A (en) | Wrought aluminum alloy with gradient structure and preparation method thereof | |
| CN110760728B (en) | Long-period structure reinforced high-strength heat-resistant magnesium alloy and preparation method thereof | |
| CN112941349A (en) | Preparation process of high-toughness corrosion-resistant magnesium alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |