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High-toughness heat-resistant Mg-Gd-Y alloy suitable for gravity casting and preparation method thereof

A technology of gravity casting and mg-gd, which is applied in the field of high-strength, toughness and heat-resistant Mg-Gd-Y alloy, high-strength and heat-resistant Mg-Gd-Y alloy preparation field, can solve the problem that the performance and heat resistance of cast aluminum alloy cannot be achieved. and other problems, to achieve the effect of enhancing the mechanical properties at room temperature and high temperature performance, good high temperature stability, and avoiding performance degradation

Active Publication Date: 2019-06-25
JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the industrial problem that the existing cast magnesium alloys cannot reach the performance of cast aluminum alloys such as A380 due to insufficient toughness and heat resistance, resulting in extremely limited applications, the present invention provides a high-strength toughness suitable for gravity casting. Heat-resistant Mg-Gd-Y alloy and its preparation method. After the alloy is subjected to gravity casting heat treatment, the room temperature tensile strength of the alloy is 298MPa, and the elongation is 16%; the high temperature tensile strength at 200°C is 216MPa, and the elongation is 22%. %

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  • High-toughness heat-resistant Mg-Gd-Y alloy suitable for gravity casting and preparation method thereof

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Effect test

Embodiment 1

[0032] The weight percentage of the high-strength and tough heat-resistant Mg-Gd-Y alloy suitable for gravity casting is: according to the theoretical ratio, 1.0% Gd, 3.0% Y, 3.2% Zn, 0.8% Al, 0.3% Mn, 0.01% Ti, 0.01 %B, the balance is Mg and other unavoidable impurities.

[0033] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0034] (2) After melting the commercially pure magnesium ingots accounting for 25% of the height of the crucible into a molten pool at 680° C., the protective gas argon is introduced, and the remaining magnesium ingots are added.

[0035] (3) After the magnesium ingots are completely melted, heat up to 700°C,...

Embodiment 2

[0042] The weight percent of the high-strength, toughness and heat-resistant Mg-Gd-Y alloy suitable for gravity casting is: according to the theoretical ratio, 1.2% Gd, 4.8% Y, 2.0% Zn, 1.2% Al, 0.1% Mn, 0.08% Ti, the remaining The amount is Mg and other unavoidable impurities.

[0043] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0044] (2) After melting the commercially pure magnesium ingot accounting for 25% of the height of the crucible into a molten pool at 680 ° C, pass through a protective gas containing 0.2% volume fraction of SF 6 and CO 2 The mixed gas, add the remaining magnesium ingots.

[0045] (3) After the magnes...

Embodiment 3

[0052] The weight percent of the high-strength and tough heat-resistant Mg-Gd-Y alloy suitable for gravity casting is: according to the theoretical ratio, 4.0% Gd, 4.0% Y, 6.0% Zn, 1.2% Al, 0.2% Mn, 0.05% Ti, 0.03 %B, the balance is Mg and other unavoidable impurities.

[0053] Preparation method: (1) After properly considering burning loss, calculate the amount of required raw materials according to the above-mentioned Mg-Gd-Y alloy composition and stoichiometric ratio; combine industrial pure magnesium ingots, industrial pure zinc, industrial pure aluminum ingots and MgGd30, Both the MgY30 and MgMn10 master alloys were deoxidized and dried and preheated to 200 °C.

[0054] (2) After melting the commercially pure magnesium ingots accounting for 25% of the height of the crucible into a molten pool at 680° C., the protective gas argon is introduced, and the remaining magnesium ingots are added.

[0055] (3) After the magnesium ingots are completely melted, heat up to 700°C, ad...

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Abstract

The invention provides a high-toughness heat-resistant Mg-Gd-Y alloy suitable for gravity casting and a preparation method thereof. The alloy comprises the following chemical components of, in percentage by mass, 4.0%-10.0% of RE, 2.0%-6.0% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01-0.08% of M and the balance Mg, wherein M is one or two elements Ti and B. The preparation method comprises the following steps of (1), proportioning according to Mg-Gd-Y alloy components; (2), melting a industrial pure magnesium ingot; (3), heating to 700 DEG C, melting industrial pure zinc, Mg-Gd-Mg-Y and Mg-Mnintermediate alloy; (4), heating to 730 DEG C, adding and melting industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B intermediate alloy, refining to obtain a magnesium alloy melt; (5), carryingout gravity casting; and (6) carrying out secondary solid solution and artificial aging treatment. According to the method, after the alloy is subjected to gravity casting, secondary solid solution treatment and artificial aging heat treatment, the tensile strength is 298 Mpa and the elongation percentage is 16% at room temperature; the high-temperature tensile strength is 216 Mpa and the elongation percentage is 22% at 200 DEG C, and the high-end requirement for lightweight development in the industries of aerospace, war industry, automobiles and the like is met.

Description

technical field [0001] The invention relates to a high-strength, toughness and heat-resistant Mg-Gd-Y alloy suitable for gravity casting, which meets the high-end demand for lightweight development in aerospace, automobile, telecommunications and other industries. The invention also relates to a preparation method of a high-strength, toughness and heat-resistant Mg-Gd-Y alloy suitable for gravity casting, which belongs to the field of industrial magnesium alloys and their manufacture. Background technique [0002] As the lightest engineering metal material (the density of magnesium is 2 / 3 of aluminum and 1 / 4 of steel), its specific strength is obviously higher than that of aluminum alloy and steel. Higher than engineering plastics, it also has a series of advantages such as good castability, good machinability, good thermal conductivity, damping, strong electromagnetic shielding ability and easy recycling. Wide application prospects. Magnesium alloy has become an ideal mat...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C23/06C22C1/03B22D21/04C22F1/06
Inventor 刘思雨叶兵刘希琴刘子利
Owner JIANGSU FAVOUR AUTOMOTIVE NEW STUFF SCI TECH
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