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Method for regulating and controlling Mg-Nd alloy phase through magnetic field and cooling rate

A mg-nd and alloy technology, which is applied in the field of rare earth magnesium alloy light engineering material preparation, can solve the problems of high cost, small improvement in alloy performance, and unstable performance, and achieve energy saving and environmental protection. The method of alloy phase selection is simple and convenient Effect

Active Publication Date: 2018-08-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1. The preparation method adopted does not change the phase composition of the magnesium alloy, and the performance of the alloy is improved slightly, and the hardness value is about 70-130HB (74-137HV);
[0006] 2. The prepared as-cast alloy is in a thermodynamically unstable state, and it is easy to undergo phase transformation with temperature changes in the subsequent use process, the performance is not stable enough, and the risk of failure is relatively high;
[0007] 3. The use of deep supercooling, strong magnetic field and other processing methods has high cost and is not conducive to large-scale industrialization

Method used

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  • Method for regulating and controlling Mg-Nd alloy phase through magnetic field and cooling rate
  • Method for regulating and controlling Mg-Nd alloy phase through magnetic field and cooling rate

Examples

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Effect test

Embodiment 1

[0026] In this example, see figure 1 , a kind of magnetic field and the method for cooling rate regulation and control Mg-Nd alloy phase, comprise the steps:

[0027](1) Alloy melting and casting process: According to the general formula of Mg-Nd alloy is the alloy element mass ratio of Mg-24wt.%Nd, the alloy raw materials Mg and Nd with a purity of 99.9% are weighed, and the vacuum suspension melting method adopted is used for alloying smelting, and then solidifying the alloy melt to prepare Mg-Nd alloy ingots; the conditions of the vacuum suspension melting method used are: the vacuum reaches 2×10 -3 When the Pa is below, argon protective gas is introduced, and the argon protective gas is continuously introduced during the whole melting process to protect the melting alloy material, and the melting current is controlled to 200A. Make the composition of the alloy material uniform, so as to prepare a Mg-Nd alloy ingot with uniform composition;

[0028] (2) Alloy remelting an...

Embodiment 2

[0032] This embodiment is basically the same as Embodiment 1, especially in that:

[0033] In this example, see figure 1 , a kind of magnetic field and the method for cooling rate regulation and control Mg-Nd alloy phase, comprise the steps:

[0034] (1) This step is identical with embodiment one;

[0035] (2) Alloy remelting and solidification treatment process: after the Mg-Nd alloy ingot prepared in the step (1) is vacuum-packaged, it is placed in a magnetic field heat treatment furnace, and the Mg-Nd alloy ingot is remelted and solidified Treatment, alloy remelting and solidification treatment The conditions for the treatment are: the Mg-Nd alloy ingot prepared in the step (1) is heated from room temperature to 643 ° C, and kept for 20 minutes, so that the Mg-Nd alloy ingot is remelted into Mg-Nd alloy melt, then the Mg-Nd alloy melt is solidified, the magnetic field intensity of the uniform magnetic field applied to the Mg-Nd alloy melt is controlled to be 1T, and the M...

Embodiment 3

[0039] This embodiment is basically the same as the previous embodiment, and the special features are:

[0040] In this example, see figure 1 , a kind of magnetic field and the method for cooling rate regulation and control Mg-Nd alloy phase, comprise the steps:

[0041] (1) This step is identical with embodiment one;

[0042] (2) Alloy remelting and solidification treatment process: after the Mg-Nd alloy ingot prepared in the step (1) is vacuum-packaged, it is placed in a magnetic field heat treatment furnace, and the Mg-Nd alloy ingot is remelted and solidified Treatment, alloy remelting and solidification treatment The conditions for the treatment are: the Mg-Nd alloy ingot prepared in the step (1) is heated from room temperature to 643 ° C, and kept for 20 minutes, so that the Mg-Nd alloy ingot is remelted into Mg-Nd alloy melt, then carry out solidification treatment to Mg-Nd alloy melt, control the magnetic field intensity of the uniform magnetic field that is applied ...

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Abstract

The invention discloses a method for regulating and controlling Mg-Nd alloy phase through a magnetic field and cooling rate. The method is characterized in that the magnetic field applied to an Mg-Ndalloy melt is controlled, and the cooling rate in the solidification process of the Mg-Nd alloy melt is controlled; the solidification condition under that a stable phase in a produced second-phase intermetallic compound can be optimally generated is determined in the Mg-Nd alloy solidification process; the phase type and the phase ratio of the second-phase intermetallic compound are regulated andcontrolled to enable the solidification of the Mg-Nd alloy melt, and thus a target magnesium alloy material is prepared. According to the method, the magnetic field is applied to change the second phase type of the solidified Mg-Nd alloy; the vickers hardness of the Mg-Nd alloy prepared by applying the magnetic field is 292.4-418.5HV; an alloy phase selection method is adopted and is simple, convenient, energy saving, environmentally friendly, low in cost, and easily applicable to the industrial production, and is a method for controlling the structure phase of an Mg-Nd cast alloy, and the controllability is high.

Description

technical field [0001] The invention relates to a preparation process of a magnesium alloy, in particular to a preparation process of a rare earth magnesium alloy with an adjustable second phase, which is applied in the technical field of preparation of rare earth magnesium alloy light engineering materials. Background technique [0002] As a cold physical field, the magnetic field can affect the solidification process of the alloy. For paramagnetic alloys, the magnetic field can promote the system to tend towards equilibrium solidification. Due to the different magnetic susceptibility of different phases, the solidified structure of the magnetic field alloy has different changes in the type and content of the phase compared with the solidified structure without a magnetic field. In addition, the magnetic field can affect the diffusion and migration of interfacial atoms, thereby promoting or inhibiting the formation of specific phases. During the solidification process of ...

Claims

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Application Information

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IPC IPC(8): B22D27/02B22D27/04C22C23/06C22C28/00C22C1/02
CPCB22D27/02B22D27/04C22C1/02C22C23/06C22C28/00
Inventor 李谦罗群翟聪蔡奇
Owner SHANGHAI UNIV
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