Mg-Zn-Y-Nd-Ti-Zr cast magnesium alloy with low thermal cracking sensitivity and high strength and toughness

A casting magnesium alloy and sensitive technology, applied in the field of casting magnesium alloys, can solve the problems of low yield of castings and large tendency of hot cracking, and achieve the effects of reducing content, weakening stress, and promoting refinement

Active Publication Date: 2021-01-19
WEIHAI WANFENG MAGNESIUM IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the deficiencies of the above-mentioned pri

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-strength and tough Mg-Zn-Y-Nd-Ti-Zr alloy with low thermal cracking sensitivity contains the components and their nominal mass percentages: 4.5wt.% Zn, 1wt.% Y, 2wt.% Nd , 0.5wt.% Ti and 0.5wt.% Zr, and the rest are Mg and unavoidable impurity elements. The concrete manufacturing method of this alloy is carried out as follows:

[0026] (1) Considering burning loss, according to the following mass percentage content 5wt.%Zn, 1.2wt.%Y, 2.2wt.%Nd, 0.6wt.%Ti and 0.8wt.%Zr and the balance are Mg, weigh Pure Mg, pure Zn, pure Ti (powder or chips), and master alloys Mg-25Y (wt%), Mg-25Nd (wt%), Mg-30Zr (wt%).

[0027] (2) The temperature of the smelting furnace is raised to 750° C., and smelted in an electric furnace under the protection of 99.8% N2 and 0.2% SF6 mixed gas. Blow in argon to stir and remove slag, after standing still for 30-50 minutes, take a sample and use x-ray spectrum to detect its actual composition: 4.7wt.%Zn, 1.1wt.%Y, 1.9wt.%Nd, 0.5wt .%Ti and ...

Embodiment 2

[0032] A high-strength and tough Mg-Zn-Y-Nd-Ti-Zr alloy with low thermal cracking sensitivity contains the components and their nominal mass percentages: 4.5wt.% Zn, 1wt.% Y, 2wt.% Nd , 0.5wt.% Ti and 0.5wt.% Zr, and the rest are Mg and unavoidable impurity elements. The concrete manufacturing method of this alloy is carried out as follows:

[0033] (1) Considering burning loss, according to the following mass percentage content 5wt.%Zn, 1.2wt.%Y, 2.2wt.%Nd, 0.6wt.%Ti and 0.8wt.%Zr and the balance are Mg, weigh Pure Mg, pure Zn, pure Ti (powder or chips), and master alloys Mg-25Y (wt%), Mg-25Nd (wt%), Mg-30Zr (wt%);

[0034] (2) Raise the temperature of the smelting furnace to 750°C, under 99.8%N 2 and 0.2% SF 6 Melted in an electric furnace under the protection of mixed gas. Blow in argon to stir and remove slag, after standing still for 30-50 minutes, take a sample and use x-ray spectrum to detect its actual composition: 4.8wt.%Zn, 0.9wt.%Y, 2.0wt.%Nd, 0.5wt .%Ti and 0....

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Abstract

The invention provides a Mg-Zn-Y-Nd-Ti-Zr cast magnesium alloy with low thermal cracking sensitivity and high strength and toughness, and belongs to the technical field of cast magnesium alloys. The alloy comprises the following components in percentage by weight of 4-5 wt.% of Zn, 1.0-1.2 wt.% of Y, 1.8-2.2 wt.% of Nd, 0.3-0.6 wt.% of Ti, 0.5-0.8 wt.% of Zr and the balance of Mg and impurity elements. The rare earth element Nd with the solid solubility limit much smaller than that of the rare earth element Y is added into the Mg-4.5Zn-1Y alloy, the content of the rare earth element Nd is controlled, the strength of the alloy can be more effectively improved, 0.3-0.6 wt.% of Ti and 0.5-0.8 wt.% of Zr are added, magnesium alloy grains are further refined, and the thermal cracking sensitivity of the alloy is reduced while the strength and toughness of the alloy are improved.

Description

technical field [0001] The invention belongs to the technical field of cast magnesium alloys, and in particular relates to a high-strength and tough Mg-Zn-Y-Nd-Ti-Zr cast magnesium alloy with low thermal cracking sensitivity. Background technique [0002] Due to its low density, high specific strength, and high damping performance, magnesium alloys are considered to be an important development direction for lightweight in the fields of automobiles, aerospace, and weaponry. At present, due to the good fluidity of commercial magnesium alloys, they are very suitable for casting and forming, so in the existing magnesium alloy engineering structural parts, casting alloys account for almost more than 90%. On the other hand, compared with wrought magnesium alloys, cast magnesium alloys are affected by as-cast defects and have lower strength and toughness, especially when they are used for forming complex structural parts, they are very prone to hot cracking. Previous studies have ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03
CPCC22C23/04C22C1/03
Inventor 朱训明刘旦王志方王建孟祥鋆
Owner WEIHAI WANFENG MAGNESIUM IND DEV
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