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High-strength cast Mg alloy containing rare-earth and preparing process thereof

A technology for casting magnesium alloys with high strength, applied in the field of metal materials and metallurgy, can solve problems such as restricting applications, and achieve the effects of reducing the number of inclusions, improving the refining effect, and reducing burning loss

Inactive Publication Date: 2006-03-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's ZM6 is a commercial alloy developed on the basis of Mg-RE(Nd) binary alloys, but its room temperature tensile strength is only 250MPa, and its yield strength is 142MPa (Aeronautical Materials Handbook), which seriously limits the alloy's ability to operate at room temperature. Therefore, it is necessary to further optimize the alloy composition and improve the alloy preparation process to increase its tensile strength to 300-350MPa, and develop a low-cost cast magnesium rare earth alloy with higher room temperature performance and high temperature performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Prepare the Mg-Nd master alloy containing 2.5wt% Nd (wt% refers to the percentage of the total weight of the prepared alloy, and the total weight is the weight sum of Mg, Zn and various master alloys), Mg containing 0.5wt% Ca -Ca master alloy, pure zinc containing 0.4wt% Zn, Mg-Zr master alloy containing 0.8wt% Zr, and the balance is pure magnesium; (2) pure magnesium, Zn, master alloy Mg-Nd, Mg- Zr and Mg-Ca are preheated to 180°C, and then pure magnesium is placed in SF 6 / CO 2 (3) When the temperature of molten magnesium reaches 720°C, pure Zn, Mg-Ca, and Mg-Nd intermediate alloys are directly added to the molten magnesium, and the temperature of the molten magnesium rises to Add Mg-Zr master alloy at 780°C, skim off the surface scum after it melts, and stir for 2 minutes; (4) After stirring, raise the temperature of the magnesium liquid to 780°C and keep it for 20 minutes, then cool it down to 750°C, and continue electric refining 6 minutes, heat up to 780°C a...

Embodiment 2

[0032] (1) prepare the Mg-Nd master alloy containing 2.5wt% Nd, the pure zinc containing 0.4wt% Zn, the Mg-Zr master alloy containing 1.2wt% Zr, and the balance is pure magnesium; (2) pure magnesium is first , Zn, intermediate alloys Mg-Nd and Mg-Zr are preheated to 180°C, and then pure magnesium is placed in SF6 / CO 2 Melting in a gas-protected furnace; (3) When the temperature of the molten magnesium reaches 720°C, pure Zn and Mg-Nd intermediate alloys are directly added to the molten magnesium, and the temperature of the molten magnesium rises to 780°C after the Mg-Nd is melted. Add the Mg-Zr master alloy, skim off the scum on the surface after it is melted, and stir for 2 minutes; (4) After stirring, raise the temperature of the magnesium liquid to 780°C and keep it for 20 minutes, then cool it down to 750°C, continuously refine it for 6 minutes, and refine After that, the temperature is raised to 780°C, and the standing time is controlled at 25 minutes; (5) After standing...

Embodiment 3

[0037] (1) Prepare the Mg-Nd master alloy containing 3wt% Nd, the Mg-Ca master alloy containing 0.2wt% Ca, the pure zinc containing 0.4wt% Zn, the Mg-Zr master alloy containing 0.8wt% Zr, the balance (2) Preheat pure magnesium, Zn, intermediate alloys Mg-Nd, Mg-Zr and Mg-Ca to 180°C, and then put pure magnesium in SF 6 / CO 2 (3) When the temperature of molten magnesium reaches 720°C, pure Zn, Mg-Ca, and Mg-Nd intermediate alloys are directly added to the molten magnesium, and the temperature of the molten magnesium rises to Add Mg-Zr master alloy at 780°C, skim off the surface scum after it melts, and stir for 2 minutes; (4) After stirring, raise the temperature of the magnesium liquid to 780°C and keep it for 20 minutes, then cool it down to 750°C, and continue electric refining 6 minutes, after refining, the temperature was raised to 780°C, and the standing time was controlled at 25 minutes; (5) After standing, the magnesium liquid was cooled to 730°C, and then the surface ...

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Abstract

A high-strength cast RE-contained Mg-alloy contains Nd (2.5-3.6 Wt%), Zr (0.35-0.8), Zn (0-0.4), Ca (0-0.5), impurities (0-0.02) and Mg (rest). It is prepared through smelting Mg, adding Nd, Zr and Ca in Mg-Nd, Mg-Zr and Mg-Ca alloy mode, adding Zn, solution treating at 525-540 deg.C for 4-12 hr, quenching in water and ageing at 200 deg.C for 12-20 hr. It has high strength, hardness and high-temp creep performance.

Description

technical field [0001] The invention relates to a rare earth-containing high-strength cast magnesium alloy and a preparation method thereof, in particular to a preparation method for obtaining a high-strength magnesium alloy by adding alloy elements (Nd, Zr, Zn, Ca) and changing the process conditions of smelting and heat treatment , the prepared magnesium alloy has mechanical properties such as room temperature strength, hardness, and high temperature creep performance superior to traditional commercial magnesium alloy ZM6. It belongs to the field of metal materials and metallurgy. Background technique [0002] Magnesium rare earth alloys have good room temperature, high temperature mechanical properties and corrosion resistance, and are a class of magnesium alloys with very good application prospects; however, the high cost of magnesium rare earth alloys severely limits the wide application of magnesium rare earth alloys, especially in civil applications ; Magnesium rare ...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 丁文江付彭怀彭立明蒋海燕曾小勤翟春泉
Owner SHANGHAI JIAO TONG UNIV
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