Rare earth magnesium alloy and preparation method thereof

A technology of rare earth magnesium and magnesium alloys, which is applied in the field of alloy materials, can solve the problems of low high temperature strength and achieve high high temperature tensile strength, high room temperature tensile strength, and improved plasticity

Active Publication Date: 2014-07-09
WUHU INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its β(Mg 17 al 12 ) phase has a low melting point, resulting in very low high temperature strength, which limits the application of the alloy in higher temperature applications, so it is necessary to modify the existing AZ91D magnesium alloy to improve its high temperature tensile strength

Method used

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  • Rare earth magnesium alloy and preparation method thereof
  • Rare earth magnesium alloy and preparation method thereof
  • Rare earth magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of rare earth magnesium alloy

[0031] Its composition mass percentage is: Al8.6%, Zn0.89%, Mn0.30%, Nd0.83%, Er0.42%, impurity elements are Si, Fe, Cu, the total content is less than 0.04%, and the rest is Mg.

[0032] A preparation method of a rare earth magnesium alloy, comprising the following steps:

[0033] a) The prepared industrial product AZ91D magnesium alloy, the magnesium neodymium master alloy containing 26.35% Nd and the magnesium erbium master alloy containing 30.6% Er are mixed according to the mass percentage of the above components. The prepared magnesium alloy raw material is placed in an oven and preheated to 150°C.

[0034] The composition and weight percentage of the industrial product AZ91D magnesium alloy: Al is 8.8%, Zn is 0.91%, Mn is 0.32%, impurity elements are Si, Fe, Cu, the total content is less than 0.04%, and the rest is Mg.

[0035] b) The composition and weight percentage of covering agent are: LiCl (analytical pure) is 35%, B...

Embodiment 2

[0046] A kind of rare earth magnesium alloy

[0047] Its composition mass percentage is: Al is 8.7%, Zn is 0.88%, Mn is 0.28%, Nd is 0.39%, Er is 0.41%, impurity elements are Si, Fe, Cu, the total content is less than 0.04%, and the rest is Mg.

[0048] A preparation method of a rare earth magnesium alloy, comprising the following steps:

[0049] Steps a) to g) of this embodiment are the same as steps a) to g) of Embodiment 1.

[0050] The rare earth magnesium alloy of this embodiment has a tensile strength of 218 MPa and an elongation of 3.8% at room temperature; a tensile strength of 169 MPa and an elongation of 7.8% at 175°C.

Embodiment 3

[0052] A kind of rare earth magnesium alloy

[0053] Its composition mass percentage is: Al is 8.4%, Zn is 0.85%, Mn is 0.29%, Nd is 1.21%, Er is 0.43%, impurity elements are Si, Fe, Cu, the total content is less than 0.04%, and the rest is Mg.

[0054] A preparation method of a rare earth magnesium alloy, comprising the following steps:

[0055] Steps a) to g) of this embodiment are the same as steps a) to g) of Embodiment 1.

[0056] The rare earth magnesium alloy of this embodiment has a tensile strength of 228 MPa and an elongation of 3.9% at room temperature; a tensile strength of 174 MPa and an elongation of 7.9% at 175°C.

[0057] The AZ91D-Nd-Er rare earth magnesium alloy prepared in Examples 1-3 and the raw material industrial product AZ91D magnesium alloy were subjected to T6 heat treatment, and the tensile strength was tested at room temperature and 175°C respectively. The results are shown in Table 1 below.

[0058] Table 1

[0059]

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Abstract

The invention discloses a rare earth magnesium alloy and a preparation method thereof. The rare earth magnesium alloy contains the following components in percentage by mass: 8.4-8.7% of Al, 0.85-0.89% of Zn, 0.28-0.30% of Mn, 0.39-1.21% of Nd, 0.41-0.43% of Er, less than 0.04% of impurity elements (Si, Fe and Cu) in total, and the balance of Mg. According to the method, rare earth elements Nd and Er are compounded and added in a magnesium alloy by smelting so as to modify the magnesium alloy and the obtained casting-state rare earth magnesium alloy is subjected to T6 heat treatment. Compared with the prior art, the rare earth magnesium alloy prepared by the method is relatively high in room-temperature tensile strength and high-temperature tensile strength and the plasticity is enhanced greatly.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to a rare earth-containing magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structural material, magnesium alloy has high specific strength and specific stiffness, excellent damping performance, good casting performance and machining performance, and has broad application prospects. [0003] Among the commonly used cast magnesium alloys, AZ91D has been widely used in the automotive industry for its excellent casting process performance, excellent room temperature mechanical properties and good corrosion resistance. However, due to its β(Mg 17 Al 12 ) phase has a low melting point, resulting in very low high temperature strength, which limits the application of the alloy in higher temperature applications. Therefore, it is necessary to modify the existing AZ91D magnesium alloy to improve its high temperature tensile str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03
Inventor 周天承
Owner WUHU INST OF TECH
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