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Heat-resistant wrought magnesium alloy containing calcium and neodymium and preparation method thereof

A heat-resistant deformation, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of patents and few applications, and achieve the effects of promoting dynamic recrystallization, improving alloy strength, and simple operation

Active Publication Date: 2016-06-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to literature search, there are few methods, patents and applications for improving the mechanical properties and heat resistance of wrought magnesium alloys by compounding alkaline earth calcium and rare earth neodymium on the basis of Mg-Al system.

Method used

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  • Heat-resistant wrought magnesium alloy containing calcium and neodymium and preparation method thereof
  • Heat-resistant wrought magnesium alloy containing calcium and neodymium and preparation method thereof
  • Heat-resistant wrought magnesium alloy containing calcium and neodymium and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: The Mg-Al magnesium alloy containing alkaline earth calcium rare earth neodymium of this embodiment includes the following components by weight percentage: Al2.85wt.%, Ca0.44wt.%, Nd0.62wt.%, and the balance is Mg And unavoidable impurities are less than 0.06wt.%.

[0025] Prepare by above-mentioned proportioning and following manner, just can obtain the magnesium alloy of present embodiment:

[0026] a) Alloy smelting and casting: The raw materials used are industrial pure magnesium ingots, pure aluminum ingots, Mg-30%Ca master alloy, Mg-25%Nd master alloy. Cast by semi-continuous casting method. in SF 6 +CO 2 Under gas protection, put the magnesium ingot into the crucible and heat up to 730°C (or 740°C, 750°C) after melting, and add pure aluminum ingot, Mg-30%Ca master alloy, Mg- 25% Nd intermediate alloy, preheat at 170°C (or 140°C, 210°C) for 25 minutes before adding, press it below the liquid level quickly when adding, stir for 5 minutes after mel...

Embodiment 2

[0030] Embodiment 2: The Mg-Al series magnesium alloy containing alkaline earth calcium rare earth neodymium of the present embodiment comprises the following composition by weight percentage: Al2.79wt.%, Ca0.39wt.%, Nd1.11wt.%, the balance is Mg and Unavoidable impurities are less than 0.06wt.%. The method of alloy smelting and casting-machining-homogenization-hot extrusion to obtain the magnesium alloy of this example is the same as that of Example 1, except that the composition ratio of the smelted alloy is different.

Embodiment 3

[0031] Example 3: The Mg-Al magnesium alloy containing alkaline earth calcium rare earth neodymium in this example includes the following components by weight percentage: Al2.80wt.%, Ca0.37wt.%, Nd1.76wt.%, and the balance is Mg And unavoidable impurities are less than 0.06wt.%. The method of alloy smelting and casting-machining-homogenization-hot extrusion to obtain the magnesium alloy of this example is the same as that of Example 1, except that the composition ratio of the smelted alloy is different.

[0032]

[0033] Figure 1~Figure 3 It is a photo of the metallographic structure of the extruded bar. From the photo, it can be found that the average grain size of the metallographic structure after thermal processing is below 5 μm, and the alloy grains are more uniform and finer with the increase of the Nd content. Example 1- The average grain sizes of 3 are 4.13 μm, 2.70 μm, and 2.39 μm, respectively. Precipitation strengthening and grain boundary strengthening enhanc...

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Abstract

The invention provides a heat-resistant wrought magnesium alloy containing calcium and neodymium and a preparation method thereof. The heat-resistant wrought magnesium alloy comprises, by mass percentage, 2.5-3.5 wt.% of Al, 0.30-0.60 wt.% of Ca, 0.5-2.0 wt.% of Nd and the balance Mg and unavoidable impurities, wherein the total number of the impurities is smaller than 0.06 wt.%. The preparation method is realized by adding the alkaline-earth element calcium and the rare-earth element neodymium in a compounding mode in combination with a hot extrusion process. The certain amount of calcium is added in the Mg-Al system magnesium alloy and can be combined with aluminum atoms to form a high-melting-point Al2Ca phase; the rare-earth neodymium is added, so that the grain can be effective refined; meanwhile, the neodymium and the aluminum in the alloy can form a high-temperature stable rare earth phase, and the strength of the material is improved. The alloy subjected to hot extrusion has a compact structure and a fine grain size, thereby having high strength at high temperature and meanwhile guaranteeing certain plasticity (higher than 39%).

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a heat-resistant deformation magnesium alloy containing calcium and neodymium and a preparation method thereof. Background technique [0002] With the development of society and the advancement of science and technology, production and life have put forward higher requirements for material performance. As the lightest commercial metal structural material, magnesium alloy has many advantages such as low density, high specific strength and specific stiffness, good casting performance, good shock absorption, high electromagnetic shielding performance, easy cutting and recyclability, etc. The alloy of choice for lightweight design and energy saving and consumption reduction such as aerospace and aerospace. However, the disadvantages of magnesium alloys, such as poor high temperature performance and low creep strength, limit the further application of magnesium alloys. For example, the commonl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 陈先华徐笑阳陈娇潘复生
Owner CHONGQING UNIV
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