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Low cost heat-resistant magnesium alloy containing rare earth, and prepartion method

A rare earth intermediate alloy and magnesium alloy technology are applied in the field of low-cost rare earth-containing heat-resistant magnesium alloys and their preparation fields, and can solve the problems of low creep resistance and the like

Inactive Publication Date: 2007-12-26
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these alloys have a disadvantage, that is, the creep resistance at temperatures above 120°C is extremely low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Melting method of AZ91D+0.1% cerium-rich mixed rare earth magnesium alloy for die-casting production

[0040] 1. Melting and casting Mg-10% cerium-rich mixed rare earth master alloy ingot, the ingot casting includes the following steps:

[0041] (1) Prepare materials according to the weight percentage of the Mg-10% cerium-rich mixed rare earth master alloy of the present invention;

[0042] (2) Heat up the preheating furnace to 360-460°C, and heat up the melting furnace to 500-600°C, and pass protective gas into the melting furnace;

[0043] (3) In the preheating furnace, preheat the pure magnesium ingot to 360-460℃, and at the same time preheat the pure cerium-rich mixed rare earth ingot to 360-460℃;

[0044] (4) To smelt pure magnesium ingots in a preheated melting furnace, first add the preheated pure magnesium ingots, which account for 1 / 2 to 1 / 20 of the melting weight of 1 melting furnace, into the melting furnace to protect them Completely melt under the pr...

Embodiment 2

[0058] Example 2: Smelting method of AZ91D+3.0% cerium-rich mixed rare earth magnesium alloy for die-casting production

[0059] 1. Melting and casting Mg-50% cerium-rich mixed rare earth master alloy ingot, the ingot casting includes the following steps:

[0060] (1) Prepare materials according to the weight percentage of the Mg-50% cerium-rich mixed rare earth master alloy of the present invention;

[0061] (2) Heat up the preheating furnace to 360-460°C, and heat up the melting furnace to 500-600°C, and pass protective gas into the melting furnace;

[0062] (3) In the preheating furnace, preheat the pure magnesium ingot to 360-460℃, and at the same time preheat the pure cerium-rich mixed rare earth ingot to 360-460℃;

[0063] (4) To smelt pure magnesium ingots in a preheated melting furnace, first add the preheated pure magnesium ingots, which account for 1 / 2 to 1 / 20 of the melting weight of 1 melting furnace, into the melting furnace to protect them Completely melt under the p...

Embodiment 3

[0077] Example 3: Melting method of AZ91D+1.0% cerium-rich mixed rare earth magnesium alloy for die-casting production

[0078] 1. Melting and casting Mg-30% cerium-rich mixed rare earth master alloy ingot, the ingot casting includes the following steps:

[0079] (1) Prepare materials according to the weight percentage of the Mg-30% cerium-rich mixed rare earth master alloy of the present invention;

[0080] (2) Heat up the preheating furnace to 360-460°C, and heat the melting furnace to 500-600°C, and pass protective gas into the melting furnace;

[0081] (3) In the preheating furnace, preheat the pure magnesium ingot to 360-460℃, while preheating the pure cerium-rich mixed rare earth ingot to 360-460℃;

[0082] (4) To smelt pure magnesium ingots in a preheated melting furnace, first add the preheated pure magnesium ingots that account for 1 / 2 to 1 / 20 of the melting weight of 1 melting furnace into the melting furnace to protect them Completely melt under the protection of gas, an...

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PUM

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Abstract

This invention discloses a method for preparing low-cost heat-resistant Mg alloy containing rare earth, which is prepared by: adding Mg / rare earth intermediate alloy into molten AZ91D, AM50B or AM60B Mg alloy, and die-casting. The rare earth content of the heat-resistant Mg alloy is 0.1-3.0 wt.%, and the rare earth is one of La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, Y, Ce-rich mixed rare earths and Nd-rich mixed rare earths. The method comprises: smelting Mg / rare earth intermediate alloy ingot (rare earth content = 10-60 wt.%), pressing into wire or rod, melting AZ91D, AM50B or AM60B Mg alloy, cutting Mg / rare earth intermediate alloy wire or rod, preheating, adding into molten AZ91D, AM50B or AM60B Mg alloy, and die-casting into heat-resistant Mg alloy. The heat-resistant Mg alloy has largely increased creep resistance at 120-200 deg.C, and can be used in cylinder body, automatic gear box, oil pump and crankcase.

Description

Technical field [0001] The invention relates to a low-cost heat-resistant magnesium alloy containing rare earths and a preparation method thereof. Background technique [0002] Magnesium alloy has a very significant advantage in many occasions due to its relatively small density (the smallest density among practical structural metals). Especially in aviation, aerospace, as well as automobiles, motorcycles, high-speed / light rail trains and other transportation tools, it has an irreplaceable advantage. The small density of the components can save energy, and it also has the advantage of small inertia in high-speed motion occasions, which has a significant effect on the starting and braking of vehicles. [0003] Traditional magnesium alloys such as AZ91D, AM50B, AM60B, etc. have been widely used. Among them, the nominal composition of AZ91D is: Al-9, Zn-1, Mn-0.3; the nominal composition of AM50B is: Al-5, Mn-0.4 ; The nominal composition of AM60B is: Al-6, Mn-0.4. These magnesium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03B22D21/04
Inventor 张奎李兴刚焦红忠米绪军熊柏青孙银祥李永军李永华李明东
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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