A kind of high-strength and tough single-phase cast magnesium alloy and preparation method thereof

A casting magnesium alloy, single-phase technology, applied in the field of magnesium alloys, can solve the problems of low absolute strength, poor plasticity, and difficult deformation of magnesium alloys, achieve good comprehensive mechanical properties, good plasticity, and improve the sliding resistance of the base surface

Active Publication Date: 2020-11-24
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of low absolute strength, poor plasticity and difficult deformation of magnesium alloys, and provide a high-strength and tough single-phase cast magnesium alloy

Method used

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  • A kind of high-strength and tough single-phase cast magnesium alloy and preparation method thereof
  • A kind of high-strength and tough single-phase cast magnesium alloy and preparation method thereof
  • A kind of high-strength and tough single-phase cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dosing according to the composition of Mg-25%Sc-0.6%Zr (mass fraction), after the surface is polished clean, put it into the vacuum induction furnace, start the inverter power supply, gradually increase the power to 10 KW, and then add 5 KW every 2~3 minutes, Until about 40 KW. After the charge in the crucible is melted, it is refined for 2~4 minutes. The alloy is poured after standing in the furnace for 60-90 s. After the ingot is cooled in the mold, it is taken out from the furnace.

[0031] Embed the prepared magnesium alloy in a stainless steel crucible with graphite, put the crucible in a muffle furnace, raise the temperature from room temperature to 500°C, the heating rate is 1°C / min, and carry out heat preservation after reaching the set temperature of 500°C. Time 5h, turn off the power after the heat preservation is completed, take out the crucible and quench it in water immediately to complete the heat treatment.

[0032] After the heat treatment was complet...

Embodiment 2

[0037] Dosing according to the composition of Mg-20%Sc-0.4%Zr (mass fraction), after the surface is polished clean, put it into the vacuum induction furnace, start the inverter power supply, gradually increase the power to 10 KW, and then add 5 KW every 2~3 minutes, Until about 40 KW. After the charge in the crucible is melted, it is refined for 2~4 minutes. The alloy is poured after standing in the furnace for 60-90 s. After the ingot is cooled in the mold, it is taken out from the furnace.

[0038] Embed the prepared magnesium alloy in a stainless steel crucible with graphite, put the crucible into a muffle furnace, raise the temperature from room temperature to 510°C, and the heating rate is 1°C / min. After reaching the set temperature of 510°C, perform heat preservation treatment. Time 4h, turn off the power after the heat preservation is completed, take out the crucible and quench it in water immediately to complete the heat treatment.

[0039] After the heat treatment,...

Embodiment 3

[0044] Dosing according to the composition of Mg-15%Sc-0.2%Zr (mass fraction), after the surface is polished clean, put it into the vacuum induction furnace, start the inverter power supply, gradually increase the power to 10 KW, and then add 5 KW every 2~3 minutes, Until about 40 KW. After the charge in the crucible is melted, it is refined for 2~4 minutes. The alloy is poured after standing in the furnace for 60-90 s. After the ingot is cooled in the mold, it is taken out from the furnace.

[0045] Embed the prepared magnesium alloy in a stainless steel crucible with graphite, put the crucible into a muffle furnace, raise the temperature from room temperature to 520°C, and the heating rate is 1°C / min. Time 3h, turn off the power after the heat preservation is completed, take out the crucible and quench it in water immediately to complete the heat treatment.

[0046] After the heat treatment, the mechanical properties of the alloy were tested at room temperature, and the mea...

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Abstract

The invention discloses a high-toughness single-phase casting magnesium alloy and a preparation method thereof, and belongs to the field of magnesium alloys. The high-toughness single-phase casting magnesium alloy is prepared from the following chemical components in percentage by mass: 15-25% of Sc, 0.2-0.6% of Zr and the balance of magnesium and inevitable impurities. The preparation method of the high-toughness single-phase casting magnesium alloy comprises the following steps: (1) according to the alloy proportion, the alloy materials are molten in a vacuum induction furnace and poured into a metal die to obtain a casting; (2) the casting is placed into a crucible, then the crucible is placed into a muffle furnace to be heated to 500-520 DEG C, and then heat preservation treatment is conducted for 3-5 h, wherein the heating rate is 1-2 DEG C / min; and (3) after heat preservation is completed, the crucible is taken out and immediately quenched in water, and heat treatment is completed. According to the prepared magnesium alloy, because of addition of the scandium element and solid solution of the scandium element into a magnesium substrate, the axial ratio of the magnesium alloyis lower than that of pure magnesium, and good comprehensive mechanical properties are achieved.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a high-strength and tough single-phase cast magnesium alloy and a preparation method thereof. Background technique [0002] As the structural material with the lowest density at present, magnesium alloy has the advantages of high specific strength and specific stiffness, good heat dissipation and shock absorption, abundant raw materials and recyclable utilization, etc., and has great potential for development. The crystal structure of the magnesium matrix is ​​a close-packed hexagonal structure, there is no phase transition, and its axial ratio (c / a) is 1.623, which is very close to the ideal axial ratio, which makes the critical shear of the basal plane slip of the magnesium alloy during deformation at room temperature The stress is much lower than other slip systems, therefore, the basal slip is easy to start and the basal slip cannot coordinate the deformation in the c-axis dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 陈巧旺伍太宾姜中涛姜山邓莹
Owner CHONGQING UNIV OF ARTS & SCI
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