High-strength toughness heat-resistant mg-gd-y alloy suitable for gravity casting and preparation method thereof

A gravity casting, mg-gd technology, applied in the preparation of high-strength, toughness, and heat-resistant Mg-Gd-Y alloys, high-strength, toughness, and heat-resistant Mg-Gd-Y alloys, can solve the problem of insufficient heat resistance and the inability to achieve the performance of cast aluminum alloys and other issues, to achieve the effect of high efficiency and simple process

Active Publication Date: 2021-07-09
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-strength 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 proper consideration of 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,...

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Abstract

The invention provides a high-strength, toughness, heat-resistant Mg-Gd-Y alloy suitable for gravity casting and a preparation method thereof. The alloy has chemical components in mass percentages of 4.0-10.0% RE, 2.0-6.0% Zn, and 0.5-1.2% Al , 0.1-0.3% Mn, 0.01-0.08% M, and the balance is Mg; wherein M is Ti, one or two elements in B. Preparation method: (1) batching according to the composition of Mg‑Gd‑Y alloy; (2) melting industrial pure magnesium ingot; (3) heating up to 700 °C, mixing industrial pure zinc, Mg‑Gd, Mg‑Y and Mg‑ Mn master alloy melting; (4) heating up to 730 ° C, adding industrial pure aluminum ingots, Al-Ti, Al-Ti-B, Al-B master alloys are all melted, and refined to obtain magnesium alloy melt; (5) Gravity casting ; (6) Secondary solid solution and artificial aging treatment. After gravity casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 298MPa and an elongation of 16%; a high temperature tensile strength of 216MPa and an elongation of 22% at 200°C, meeting the aviation Aerospace, military, automotive and other industries have high-end demands for lightweight development.

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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Patent Type & Authority Patents(China)
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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