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A high-strength heat-resistant magnesium alloy containing ag and its preparation method

A magnesium alloy, high-strength technology, applied in the field of high-strength heat-resistant magnesium alloy and its preparation, can solve the problems that are difficult to meet the needs of precision manufacturing and reduce the plasticity of the alloy, and achieve the improvement of age hardening effect and heat resistance, high temperature performance, good plastic effect

Active Publication Date: 2020-08-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the age hardening effect of rare earth elements added to magnesium, most of the multi-magnesium rare earths show good age strengthening effects, especially Gd and Y elements are the most significant, but this type of alloy relies on the Orowan mechanism strengthening of precipitated phases to hinder dislocation movement, obviously Reduce the plasticity of the alloy, it is difficult to meet the processing performance requirements of precision manufacturing and the use requirements of aviation, rail transportation and other fields

Method used

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  • A high-strength heat-resistant magnesium alloy containing ag and its preparation method
  • A high-strength heat-resistant magnesium alloy containing ag and its preparation method

Examples

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preparation example Construction

[0050] The present invention also provides a method for preparing an Ag-containing high-strength heat-resistant magnesium alloy, comprising the following steps:

[0051] A) batching pure Mg, pure Ag, Mg-Zr master alloy and Mg-RE master alloy according to the following mass fractions, melting and casting;

[0052] RE = Y, Nd and Gd;

[0053] Y: 4.5~6.5wt%, Nd: 1.5~4.0wt%, Gd: 1.5~4.0wt%, Ag: 0.1~1.5wt%, Zr: 0.15~1.5wt%, the balance is Mg, of which the total amount of rare earth elements Not more than 10wt%;

[0054] B) heat-treating or extruding the casting to obtain a high-strength heat-resistant magnesium alloy containing Ag.

[0055]In the present invention, the pure Mg, the pure Ag, the Mg-Zr master alloy and the Mg-RE master alloy are preferably proportioned and then dried, the drying temperature is 100-200°C, and the drying time is 1-2 hours;

[0056] (2) Put the dried pure Mg, pure Ag, and Mg-RE master alloy into the crucible and raise the temperature with the furnace...

Embodiment 1

[0076] The high-strength heat-resistant magnesium alloy in this embodiment is composed of the following components in mass percentage: Y: 4.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.1wt%, Zr: 0.5wt%, and the balance is Mg and unavoidable impurities.

[0077] The casting molding preparation of the high-strength heat-resistant magnesium alloy of this embodiment comprises the following steps:

[0078] (1) The raw materials pure Mg, pure Ag, Mg-Zr master alloy, and Mg-RE (20wt.%) master alloy are prepared according to the proportion, and then dried. The drying temperature is 200° C., and the drying time is 2 hours.

[0079] (2) During the preparation process, the melt has been in CO 2 and SF 6 Under the protection of mixed gas, CO 2 with SF 6 The ratio is 99.5:0.5.

[0080] (3) Put the dried pure Mg, pure Ag, and Mg-RE (20wt.%) master alloy into a crucible and heat up with the furnace until it is completely melted, and the temperature is controlled at 780°C.

[0081] (4) Cool the ...

Embodiment 2

[0087] The difference between Example 2 and Example 1 is that the high-strength heat-resistant magnesium alloy consists of the following components by mass percentage: Y: 6.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Ag: 0.5wt%, Zr: 0.5wt%, the balance is Mg and unavoidable impurities.

[0088] Solution treatment: heat-treat the casting at 510°C for 12h, then air-cool to room temperature. Aging treatment: heat-treat the casting at 225°C for 48 hours, then air-cool to room temperature.

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Abstract

The invention provides a high-strength heat-resistant magnesium alloy containing Ag, which has the following components in mass fraction: Y: 4.5-6.5wt%, Nd: 1.5-4.0wt%, Gd: 1.5-4.0wt%, Ag: 0.1- 1.5wt%, Zr: 0.15-1.5w%, the balance being Mg, wherein the total amount of rare earth elements does not exceed 10wt%. The composition of the high-strength heat-resistant magnesium alloy of the present invention is Mg-Y-Nd-Gd-Ag-Zr, with the precipitation strengthening of rare earth-containing intermetallic compounds as the main strengthening mechanism, and by adding non-rare earth element Ag to form RE-Ag fine High-temperature stable phase and Mg-RE-Ag eutectic, the newly formed phase has the characteristics of fine dispersion and high-temperature stability, which significantly improves the heat treatment age hardening effect and heat resistance of the material of the present invention. The invention also provides a preparation method of the Ag-containing high-strength heat-resistant magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to an Ag-containing high-strength heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] In the field of international magnesium alloy research, aging precipitation strengthening is an important direction for the development of high-strength magnesium alloys in recent years. In the past 50 years, a variety of magnesium alloys with rare earth as the main alloying element have been developed at home and abroad. Based on the age hardening effect of rare earth elements added to magnesium, most of the multi-magnesium rare earths show good age strengthening effects, especially Gd and Y elements are the most significant, but this kind of alloy relies on the Orowan mechanism strengthening of precipitated phases to hinder dislocation movement, obviously Reducing the plasticity of the alloy makes it difficult to meet the processing performance r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 孟健田政杨强管凯牛晓东孙伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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