Heat treatment process to improve the performance of long-range structural ordered phase strengthened dual-phase magnesium-lithium alloy

A technology of orderly structure and magnesium-lithium alloy, applied in the field of heat treatment process, can solve the problems of corrosion and the reduction of alloy corrosion rate, and achieve the effects of simple equipment, improved strength and plasticity, and high corrosion resistance.

Active Publication Date: 2019-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the literature (Corrosion Science (Corrosion Science) 51 (2009) 395) reported that the finely dispersed LPSO phase can inhibit the filiform corrosion in the Mg-Zn-Y magnesium alloy and reduce the corrosion rate of the alloy.
However, the early research work focused too much on the strength of magnesium-lithium alloys. The research on how the microstructure affects the corrosion resistance of the alloy and the related improvement methods has not been involved, resulting in the dual-phase Mg-Li alloy strengthened by the LPSO phase. - The corrosion problem of Zn-Y alloys in the field of engineering has not been solved

Method used

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  • Heat treatment process to improve the performance of long-range structural ordered phase strengthened dual-phase magnesium-lithium alloy
  • Heat treatment process to improve the performance of long-range structural ordered phase strengthened dual-phase magnesium-lithium alloy
  • Heat treatment process to improve the performance of long-range structural ordered phase strengthened dual-phase magnesium-lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ⅰ), the composition of the magnesium-lithium alloy used

[0023] The as-cast long-range structure ordered phase is used to strengthen the dual-phase Mg-Li-Zn-Y alloy, and its chemical composition (mass percentage content) is: lithium content is 8%; zinc content is 3%; yttrium content is 6%; magnesium margin.

[0024] Ⅱ), alloy smelting

[0025] The alloy is smelted in a vacuum smelting furnace under the protection of argon, and after being kept at 770°C for 2 hours, it is cast in the furnace.

[0026] Ⅲ), solid solution treatment

[0027] The as-cast long-range structural ordered phase strengthened dual-phase Mg-Li-Zn-Y alloy was kept at 400°C for 2 hours.

[0028] Ⅴ) Microstructure characterization

[0029] The preparation process of the sample for tissue observation is as follows: use No. 1000 silicon carbide water abrasive paper to grind the surface, and then use oil-based diamond grinding paste to mechanically polish; SEM observation results show that before the...

Embodiment 2

[0033] Same as Example 1 in that:

[0034] Ⅰ), the composition of the magnesium-lithium alloy used

[0035] Ⅱ), alloy smelting

[0036] The difference from Example 1 is:

[0037] Ⅲ), solid solution treatment

[0038] The as-cast long-range structural ordered phase strengthened dual-phase Mg-Li-Zn-Y alloy was kept at 400°C for 4 hours.

[0039] Ⅴ) Microstructure characterization

[0040] Refer to the tissue observation method of Example 1. After solution treatment, the alloy phases in the sample of Example 2 are LPSO phase, residual dendritic eutectic structure, β-Li and α-Mg matrix phase magnesium matrix, and the corresponding photos are shown in the attached figure 2 . It is worth noting that in order to reflect the existence of the LPSO phase and the residual dendrite eutectic structure, the observation magnification is high, and the α-Mg matrix phase cannot be included in the photo.

[0041] Ⅳ), corrosion and mechanical properties test

[0042] Refer to the corrosion...

Embodiment 3

[0044] Same as Example 1 in that:

[0045] Ⅰ), the composition of the magnesium-lithium alloy used

[0046] Ⅱ), alloy smelting

[0047] The difference from Example 1 is:

[0048] Ⅲ), solid solution treatment

[0049] The as-cast long-range structural ordered phase strengthened dual-phase Mg-Li-Zn-Y alloy was kept at 400°C for 8 hours.

[0050] Ⅴ) Microstructure characterization

[0051] Refer to the tissue observation method of Example 1. After solution treatment, the alloy phases in the sample of Example 3 are LPSO phase, β-Li and α-Mg matrix phases, and the corresponding photos are shown in the attached figure 1 . It is worth noting that in order to reflect the existence of the LPSO phase, the observation magnification is high, and the α-Mg matrix phase cannot be included in the photo.

[0052] Ⅳ), corrosion and mechanical properties test

[0053] Refer to the corrosion and mechanical property test method of Example 1. After solid solution treatment, the corrosion p...

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Abstract

The invention relates to the field of magnesium alloy performance optimization, in particular to a heat treatment process for remarkably improving using performance of long-range structure ordered phase enhanced bi-phase magnesium lithium alloy. The heat treatment process comprises the following steps that solid solution treatment is conducted on as-cast long-range structure ordered phase enhanced Mg-Li-Zn-Y alloy, heat preservation is conducted for 1-20 hours at 350-550 DEG C, and then water quenching cooling is conducted to room temperature. According to the heat treatment process, the corrosion resistance of the alloy can be remarkably improved, and the problem of the poor corrosion resistance of the long period phase enhanced magnesium lithium alloy is solved; and meanwhile, the strength and plasticity of the alloy are further improved, and the practical engineering application of this kind of high-strength magnesium lithium alloy is widened.

Description

technical field [0001] The invention relates to the field of performance optimization of magnesium alloys, in particular to a heat treatment process for significantly improving the service performance of long-range structured ordered phase-strengthened dual-phase magnesium-lithium alloys (such as: Mg-Li-Zn-Y cast alloys, etc.). Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structure material in engineering applications, with a density of 1.35-1.65g / cm 3 Among them, it has the characteristics of high specific strength and specific stiffness, strong cold and hot deformation ability, no obvious anisotropy and good low temperature performance. Magnesium-lithium alloys also have many advantages of magnesium alloys, such as: strong resistance to high-energy particle penetration, good electromagnetic shielding performance, good damping performance, and excellent machinability. Structural materials make magnesium-lithium alloys have potential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/06C22C23/00
CPCC22C23/00C22C23/06C22F1/002C22F1/06
Inventor 许道奎韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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