High-strength heat-resisting magnesium alloy containing Ce-rich misch metal and Gd and manufacturing method thereof

A technology for cerium-rich mixed rare earth and mixed rare earth, which is applied to industrial magnesium alloys, high-strength heat-resistant magnesium alloys and the fields of their preparation and processing to achieve the effect of high safety

Inactive Publication Date: 2012-06-06
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: 1000 kilograms of Mg-7.5Gd-0.7 cerium-rich mixed rare earth metal-0.4Zr magnesium alloy (the composition content of this magnesium alloy is: Gd 7.5wt%, rich cerium mixed rare earth 0.7wt%, Zr0.4wt%, the rest is Mg; wherein, the composition content of the cerium-rich mixed rare earth is: Ce: 50wt%; La: 30wt%; Nd: 15wt%; Pr: 5wt%) and the workpiece forging processing method.

[0039] 1. Melting preparation

[0040] Turn on the power supply of the preheating furnace and the melting furnace, and heat up. Raise the temperature of the preheating furnace to 160-260°C, raise the temperature of the melting furnace to 600-620°C, and pass protective gas (2-15% SO 2 +N 2 ).

[0041] 2. Preheating of pure magnesium ingot, pure Gd ingot, misch metal ingot and Mg-30%Zr (Zr: 30wt%, the rest is Mg) master alloy ingot

[0042] Use a preheating furnace to preheat 905 kg of pure magnesium ingots, 75 kg of pure Gd ingots, 7 kg of rich mixed rare earth metal ingots and 13 k...

Embodiment 2

[0058] Embodiment 2: 1000 kilograms of Mg-15Gd-3 cerium-rich mixed rare earth metal-1.2Zr magnesium alloy (the composition content of this magnesium alloy is: Gd 15wt%, rich cerium mixed rare earth 3wt%, Zr1.2wt%, the rest is Mg; Wherein, the composition content of the cerium-rich mixed rare earth is: Ce: 50wt%; La: 30wt%; Nd: 15wt%; Pr: 5wt%) and the rod extrusion processing method.

[0059] 1. Melting preparation

[0060] Turn on the power supply of the preheating furnace and the melting furnace, and heat up. Raise the temperature of the preheating furnace to 420-460°C, raise the temperature of the melting furnace to 600-620°C, and pass protective gas (2-15% SO 2 +N 2 ).

[0061] 2. Preheating of pure magnesium ingot, pure Gd ingot, misch metal ingot and Mg-30%Zr (Zr: 30wt%, the rest is Mg) master alloy ingot

[0062] Use a preheating furnace to preheat 780 kg of pure magnesium ingots, 150 kg of pure Gd ingots, 30 kg of rich mixed rare earth metal ingots and 40 kg of Mg-...

Embodiment 3

[0078] Embodiment 3: 1000 kilograms of Mg-7.5Gd-2 rich cerium mixed rare earth metal-0.7Zr magnesium alloy (the composition content of this magnesium alloy is: Gd 7.5wt%, rich cerium mixed rare earth 2wt%, Zr0.7wt%, all the other are Mg; wherein, the composition content of the cerium-rich mixed rare earth is: Ce: 50wt%; La: 30wt%; Nd: 15wt%; Pr: 5wt%) and the plate rolling processing method thereof.

[0079] 1. Melting preparation

[0080] Turn on the power supply of the preheating furnace and the melting furnace, and heat up. Raise the temperature of the preheating furnace to 260-360°C, raise the temperature of the melting furnace to 600-620°C, and pass protective gas (2-15% SO 2 +N 2 ).

[0081] 2. Preheating of pure magnesium ingot, pure Gd ingot, misch metal ingot and Mg-30%Zr (Zr: 30wt%, the rest is Mg) master alloy ingot

[0082] Use a preheating furnace to preheat 882 kg of pure magnesium ingots, 75 kg of pure Gd ingots, 20 kg of rich mixed rare earth metal ingots a...

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Abstract

The invention discloses high-strength heat-resisting magnesium alloy containing Ce-rich misch metal and Gd and a manufacturing method thereof. The alloy comprises 7.5-15 wt% of Gd, 0.7-3.0 wt% of Ce-rich misch metal, 0.4-1.2 wt% of Zr, and the balance consisting of Mg. The method comprises the following steps: (1) preparing materials, preheating, fusing a preheated pure magnesium ingot, dissolving a preheated pure Gd ingot, a preheated Ce-rich misch metal ingot, and an Mg-Zr intermediate alloy ingot in a magnesium melting liquid to obtain a magnesium alloy melting liquid, pouring or casting the magnesium alloy melting liquid into a magnesium alloy ingot blank; (2) carrying out uniformization heat treatment, that is, heating up the magnesium alloy ingot blank to 490-540 DEG C and keeping warm for 10-60 h to uniformly distribute Gd, Ce-rich misch metal and Zr in a base metal; (3) carrying out thermal deformation processing; (4) carrying out waste heat quenching processing; and (5) carrying out aging treatment. The magnesium alloy manufactured by the invention can satisfy the requirements of high mechanical properties and high temperature creep-resistant performance. According to the invention, by carrying out direct large thermal deformation processing and waste heat quenching and aging treatment after uniformization heat treatment, the problem that Ce, La, Pr and other alloy elements in Ce-rich misch metal have low reinforcement effect and are unstable is solved.

Description

technical field [0001] The invention relates to a high-strength heat-resistant magnesium alloy containing cerium-rich mixed rare earth and gadolinium and its preparation and processing method. The so-called cerium-rich mixed rare earth metal is a rare earth metal mixture mainly containing Ce, La, Nd, and Pr, wherein Ce is about 50wt %, La is about 30wt%, Nd is about 15wt%, and Pr is about 5wt%. It belongs to the category of industrial magnesium alloys. Background technique [0002] At present, with the continuous improvement of energy saving, environmental protection and automobile performance requirements, magnesium alloys have low density, high specific strength and rigidity, good casting performance, especially easy to die-cast, in addition to excellent vibration damping performance and easy recycling. Advantages, the application in the automotive industry is booming. With the continuous expansion of the application of magnesium alloys in automobiles, people are also de...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 张奎李兴刚李永军马志新马鸣龙张绪虎郝文龙杜志惠
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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