Aluminum-free heat-resistant die-casting rare earth magnesium alloy

A rare earth alloy, heat-resistant pressure technology, applied in the field of magnesium alloy materials, can solve the problems of low yield strength and tensile strength, achieve the effect of improving the ratio of fiber structure and alloy plasticity, improving corrosion resistance and improving comprehensive performance

Inactive Publication Date: 2008-03-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

MEL has also developed a die-cast rare earth magnesium alloy MEZ (Mg-1.92% RE-0.33% Zn-0.26% Mn) that does not contain aluminum. This alloy has better creep resistance than AE42 at 150°C to 175°C. denaturing properties, however, its yield and tensile strengths are low (I.P. Moreno, Scripta Materialia 2003, pp. 1029-1034)

Method used

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  • Aluminum-free heat-resistant die-casting rare earth magnesium alloy
  • Aluminum-free heat-resistant die-casting rare earth magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A heat-resistant die-casting rare earth magnesium alloy without aluminum, which is composed of yttrium, gadolinium, zinc, manganese and magnesium, and its proportion (mass percentage) is: yttrium: 2%, gadolinium: 0.2%, zinc: 0.3%, manganese : 0.15%, the total amount of impurity elements Fc, Cu and Ni is less than 0.03%, and the balance is magnesium.

[0017] The steps and conditions of the preparation method of the aluminum-free heat-resistant die-casting rare earth magnesium alloy are as follows:

[0018] Weigh according to the ratio; first put pure magnesium, zinc, magnesium-manganese master alloy into the crucible preheated to 650 ℃, and pass through the protective gas SF 6 and N 2 mixed composition. At 720°C, after the added charge is completely melted, continue to heat up to 750°C, add magnesium-yttrium and magnesium-gadolinium rare earth master alloys, and continue to pass the protective gas. After the magnesium-yttrium and magnesium-gadolinium rare earth maste...

Embodiment 2

[0020] A heat-resistant die-casting rare earth magnesium alloy without aluminum, which is composed of yttrium, gadolinium, zinc, manganese and magnesium, and its proportion (mass percentage) is: yttrium: 2%, gadolinium: 0.6%, zinc: 0.5%, manganese : 0.2%, the total amount of impurity elements Fe, Cu and Ni is less than 0.03%, and the balance is magnesium. Alloy properties are shown in Table 1 and Table 2.

[0021] The steps and conditions of the preparation method of the aluminum-free heat-resistant die-casting rare earth magnesium alloy are as in Example 1.

Embodiment 3

[0023] A heat-resistant die-casting rare earth magnesium alloy without aluminum, which is composed of yttrium, gadolinium, zinc, manganese and magnesium, and its proportion (mass percentage) is: yttrium: 3%, gadolinium: 0.4%, zinc: 0.6%, manganese : 0.2%, the total amount of impurity elements Fe, Cu and Ni is less than 0.02%, and the balance is magnesium.

[0024] The steps and conditions of the preparation method of the aluminum-free heat-resistant die-casting rare earth magnesium alloy are as in Example 1.

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Abstract

The heat resistant no-aluminum die cast Mg-RE alloy consists of Y 2-4 wt%, Gd 0.2-0.6 wt%, Zn 0.3-0.6 wt%, Mn 0.1-0.3 wt%, and Mg for the rest. Y as the excellent additive for raising the performance of Mg alloy can refine the dendrite crystal in the alloy, increase the rate of fiber structures in alloy fracture and raise the plasticity of the alloy; and Gd and Zn serve as the alloy reinforcing elements too. The heat resistant no-aluminum die cast Mg-RE alloy has excellent room temperature mechanical performance, high temperature mechanical performance superior to that of AE44 alloy, and excellent creep resistance in the conditions up to 250 deg.c and 30 MPa.

Description

technical field [0001] The invention relates to a heat-resistant die-casting rare earth magnesium alloy without aluminum, belonging to the field of magnesium alloy materials. Background technique [0002] In recent years, due to the increasing pressure of environmental protection and awareness of energy conservation, lightweight die-casting magnesium alloys mainly based on Mg-Al alloys have been popularized and applied in automobiles. However, compared with aluminum alloys, there is still a big gap in the application of magnesium alloys. One of the reasons is the lack of sufficient high temperature performance. The long-term service temperature of AZ and AM series die-casting magnesium alloys widely used at present cannot exceed 120°C, making them unable to be used in the manufacture of automotive transmission parts that require high temperature creep performance, thus greatly hindering the further application of magnesium alloys. Studies have shown that improving the stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
Inventor 孟健王军张景怀张德平房大庆唐定骧张洪杰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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