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A heat treatment process for suppressing the plastic instability of quasicrystal-strengthened magnesium-lithium alloys

A magnesium-lithium alloy, plastic instability technology, applied in the field of magnesium-lithium alloy, can solve the problems of magnesium-lithium alloy plastic deformation and instability, achieve high yield and tensile strength, eliminate the problem of plastic deformation and instability, and eliminate chemical composition instability The effect of the uniform area

Active Publication Date: 2016-03-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the plastic deformation instability and saw-tooth yield phenomenon of magnesium-lithium alloys during stretching have not been eliminated by the introduction of quasicrystals
In recent years, scholars from various countries have conducted a lot of research on the mechanical behavior of Mg-Li alloys. Their interests mainly focus on the nature and mechanism of plastic instability and "abnormal" mechanical behavior of alloys. Regarding how to eliminate the plastic instability in alloys, Haven't seen any reports yet

Method used

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  • A heat treatment process for suppressing the plastic instability of quasicrystal-strengthened magnesium-lithium alloys
  • A heat treatment process for suppressing the plastic instability of quasicrystal-strengthened magnesium-lithium alloys
  • A heat treatment process for suppressing the plastic instability of quasicrystal-strengthened magnesium-lithium alloys

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Experimental program
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Embodiment 1

[0021] In this embodiment, the heat treatment method for suppressing the plastic instability of the quasicrystal-strengthened magnesium-lithium alloy mainly includes the following steps:

[0022] Ⅰ), the magnesium-lithium alloy composition that adopts: use extruded state quasi-crystal strengthened Mg-Li-Zn-Y magnesium alloy, its chemical composition (weight percentage content) is: 4.3% Li, 5.83% Zn, 1.08% Y, The rest is Mg; the room temperature tensile properties of the extruded quasicrystalline strengthened Mg-Li-Zn-Y magnesium alloy are shown in the curve 1 of Figure 2(a), and its performance index is: the sawtooth amplitude fluctuation range is between 4 and 8 MPa .

[0023] Ⅱ) Solid solution treatment process: tightly wrap the extruded quasicrystalline strengthened magnesium alloy sheet with aluminum foil, solid solution at 330°C for 2 hours, then raise the temperature to 400°C, keep it warm for 4 hours, and cool it to room temperature by water quenching. The tensile perf...

Embodiment 2

[0030] The difference from Example 1 is:

[0031] Ⅰ), alloy composition

[0032] With reference to the composition ratio of Example 1, the room temperature tensile properties of the extruded state quasicrystalline strengthened Mg-Li-Zn-Y magnesium alloy are shown in the curve 1 of Fig. 2 (a), and its performance index is: the sawtooth amplitude fluctuation range is Between 4 ~ 8MPa.

[0033] Ⅱ), solid solution treatment process

[0034] The extruded quasicrystalline strengthened magnesium alloy sheet is tightly wrapped with aluminum foil, solidified at 330°C for 2 hours, then the temperature is raised to 450°C, kept for 4 hours, and cooled to room temperature by water quenching. The tensile performance at room temperature is shown in the curve 4 of Figure 2(a), and its performance index is: the sawtooth amplitude fluctuation range is between 4 and 6 MPa.

[0035] Ⅲ), aging treatment process

[0036] The magnesium alloy after solution treatment was aged at 200° C. for 6 hou...

Embodiment 3

[0042] The difference from Example 1 is:

[0043] Ⅰ), alloy composition

[0044] With reference to the composition ratio of Example 1, the room temperature tensile properties of the extruded state quasicrystalline strengthened Mg-Li-Zn-Y magnesium alloy are shown in curve 1 of Fig. 2 (b), and its performance index is: the sawtooth amplitude fluctuation range is Between 4 ~ 8MPa.

[0045] Ⅱ), solid solution treatment process

[0046] Wrap the extruded quasicrystalline strengthened magnesium alloy sheet tightly with aluminum foil, solid solution at 330°C for 2 hours, then raise the temperature to 470°C, keep it warm for 4 hours, and cool it to room temperature by water quenching. The tensile performance at room temperature is shown in the curve 2 of Figure 2(b), and its performance index is: the sawtooth amplitude fluctuation range is between 2 and 5 MPa.

[0047] Alternatively, the solution treated magnesium alloy is aged at 400° C. for 2 hours, and then water quenched to room...

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Abstract

The invention relates to the field of magnesium lithium alloys, and particularly relates to a heat treatment process for inhibiting the plastic instability of quasi-crystal reinforced magnesium lithium alloys. The process comprises the following steps: tightly wrapping a variable-form magnesium lithium alloy with an aluminum foil, carrying out solid solution treatment on the obtained object at a temperature of 330-470 DEG C, carrying out heat preservation for 4-8 hours, cooling the obtained product to room temperature by water quenching, ageing the obtained product for 12-24 hours at a temperature of 100-200 DEG C, and cooling the obtained product to room temperature by water quenching again. According to the invention, the plastic instability phenomenon of a quasi-crystal reinforced magnesium lithium alloy can be significantly inhibited, and the high yield strength and tensile strength of the alloy are retained, thereby solving the serrated yielding problem (occurring along with the tensile process) of plasticity of the magnesium lithium alloy. An alloy applicable to the heat treatment process disclosed by the invention comprises the following compositions by percent: 1.0-11.5% of Li, 5-10% of Zn, 0.5-2% of Y, and the balance of Mg. The process disclosed by the invention is simple in used equipment, low in cost, and simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of magnesium-lithium alloys, in particular to a heat treatment process for suppressing the plastic instability of quasicrystal-strengthened magnesium-lithium alloys, in particular to the elimination of the plastic instability and saw-tooth yield phenomena of magnesium-lithium alloys at room temperature during stretching Heat treatment process method. 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...

Claims

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Application Information

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