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A kind of heat treatment method of mg-al-ca system heat-resistant magnesium alloy

A heat treatment method and mg-al-ca technology, applied in the field of magnesium alloy materials, can solve the problems of deterioration of mechanical properties at room temperature, inability to strengthen, and difficult to satisfy, and achieve the effect of improving mechanical properties at room temperature

Active Publication Date: 2020-02-14
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that although the addition of Ca element has significantly improved the heat resistance of Mg-Al alloys, the mechanical properties of the alloys at room temperature have also deteriorated significantly, which is difficult to meet the requirements of practical applications.
Al above 2 Although the formation of the second Ca phase can significantly improve the heat resistance, these phases are very brittle at room temperature, and not only cannot strengthen during the deformation process, but are easily broken and become the source of cracks.

Method used

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  • A kind of heat treatment method of mg-al-ca system heat-resistant magnesium alloy
  • A kind of heat treatment method of mg-al-ca system heat-resistant magnesium alloy

Examples

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Embodiment 1

[0016] The magnesium alloy described in this embodiment is composed of Mg, Al and Ca elements, and the mass percentage content of each component is: Al: 5%, Ca: 2%, unavoidable impurities ≤ 0.15%, and the balance is Mg.

[0017] Heat treatment: after the Mg-Al-Ca series heat-resistant magnesium alloy is cast, it is solid solution at 400°C, kept for 24 hours, and water quenched to room temperature; the magnesium alloy is heated to 480°C, spheroidized, and kept for 48 hours , water quenched to room temperature.

Embodiment 2

[0019] The magnesium alloy described in this embodiment is composed of Mg, Al and Ca elements, and the mass percentage content of each component is: Al: 7%, Ca: 2.5%, unavoidable impurities ≤ 0.15%, and the balance is Mg.

[0020] Heat treatment: the Mg-Al-Ca series heat-resistant magnesium alloy is cast into a solid solution at 410°C, kept for 16 hours, and water quenched to room temperature; the magnesium alloy is heated to 500°C, spheroidized, and kept for 32 hours , water quenched to room temperature.

Embodiment 3

[0022] The magnesium alloy described in this embodiment is composed of Mg, Al and Ca elements, and the mass percentage content of each component is: Al: 9%, Ca: 3%, unavoidable impurities ≤ 0.15%, and the balance is Mg.

[0023] Heat treatment: the Mg-Al-Ca series heat-resistant magnesium alloy is cast into a solid solution at 420°C, kept for 8 hours, and water-quenched to room temperature; the magnesium alloy is heated to 520°C, spheroidized, and kept for 16 hours , water quenched to room temperature.

[0024] Taking the Mg-Al-Ca heat-resistant magnesium alloys of Examples 1-3, the room temperature yield strength, tensile strength, and elongation of the alloys were measured before and after heat treatment, and the results are shown in Table 1.

[0025] Table 1 embodiment 1-3 alloy property result

[0026]

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Abstract

The invention belongs to the technical field of magnesium alloy materials, in particular to a heat treatment method for a Mg-Al-Ca series heat-resistant magnesium alloy, wherein the alloy comprises the following components in weight percentage: Al 5-9%, Ca 2-3%, impurities ≤0.15%, the balance is Mg, and the heat treatment method is to solid-dissolve the above heat-resistant magnesium alloy at 400-420°C, keep the temperature for 8-24h, and then quench it with water to room temperature; The room temperature mechanical properties of the cast Mg-Al-Ca heat-resistant magnesium alloy are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a heat treatment method for a Mg-Al-Ca series heat-resistant magnesium alloy. Background technique [0002] At present, Mg-Al alloys with the highest degree of commercialization have been partially applied in automobiles, but due to their insufficient heat resistance, the application of Mg-Al alloys in key components such as power systems is greatly restricted. This is because the main second phase in the alloy is β-Mg 17 al 12 phase, the melting point of this phase is only 437°C, when the temperature exceeds 120°C, the β-Mg on the grain boundary 17 al 12 The phase begins to soften, which cannot pin the grain boundary and inhibit the rotation of the grain boundary, resulting in a sharp decrease in the durability strength and creep resistance of the alloy. Studies have shown that adding Si, Ca, Sr and rare earth (RE) elements to Mg-Al alloys can e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02
CPCC22C23/02C22F1/002C22F1/06
Inventor 张扬宋雷鹏陈晓阳卢雅琳丛孟启李小平
Owner JIANGSU UNIV OF TECH