Regulation and preparation method of LPSO phase in Mg-Gd-Er-Zn-Zr alloy

An alloy and alloy composition technology, applied in the field of heat treatment, can solve the problems of inability to fully exert the strengthening effect of LPSO relative to the alloy matrix, uneven distribution of LPSO phase, poor interface bonding, etc. Eliminate the effect of component segregation

Active Publication Date: 2014-12-03
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this LPSO phase is often accompanied by a coarse Mg-RE binary phase. This continuous coarse structure is not well combined with the matrix interface. At the same time, due to the unavoidable alloy composition segregation in cast alloys, LPSO The phase distribution is uneven, and the strengthening effect of LPSO relative to the alloy matrix cannot be fully exerted

Method used

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  • Regulation and preparation method of LPSO phase in Mg-Gd-Er-Zn-Zr alloy
  • Regulation and preparation method of LPSO phase in Mg-Gd-Er-Zn-Zr alloy

Examples

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Effect test

Embodiment 1

[0016] The first step is to place the Mg-12Gd-2Er-1Zn-0.6Zr alloy in a heat treatment furnace, hold it at 300°C for 30 minutes, take it out and quickly place it in hot water at 70°C for quenching; then place it in a heat treatment furnace at 480°C for 3 hours, After taking it out, quickly place it in hot water at 70°C for quenching; finally place it at a sub-high temperature of 420°C for 12 hours, and when it cools to 350°C with the furnace, take it out and quickly place it in hot water at 70°C for quenching, and the obtained alloy contains the primary The volume fraction of the two phases is 5.61%, the LPSO phase volume fraction is 6.32%, and the one-dimensional size is about 50 microns (attached figure 1 ).

Embodiment 2

[0018] The first step is to place the Mg-12Gd-2Er-1Zn-0.6Zr alloy in a heat treatment furnace, keep it at 320°C for 60 minutes, take it out and quickly place it in hot water at 70°C for quenching; then place it in a heat treatment furnace at 520°C for 8 hours, After taking it out, put it in hot water at 70°C for quenching; finally put it at the next high temperature of 460°C for 50h, and when it is cooled to 350°C with the furnace, put it in hot water at 70°C for quenching after taking it out, and the obtained alloy contains the primary The volume fraction of the two phases is 0.12%, the volume fraction of the LPSO phase is 45.67%, and the one-dimensional size is about 120 microns (attached figure 2 ).

Embodiment 3

[0020] The first step is to place the Mg-12Gd-2Er-1Zn-0.6Zr alloy in a heat treatment furnace, keep it at 300°C for 60 minutes, take it out and put it in hot water at 70°C for quenching; then put it in a heat treatment furnace at 500°C for 8 hours, After taking it out, quickly place it in hot water at 70°C for quenching; finally place it at a sub-high temperature of 440°C for 24 hours, and when it cools to 350°C with the furnace, take it out and quickly place it in hot water at 70°C for quenching, and the obtained alloy contains the primary The volume fraction of the two phases is 0.8%, the volume fraction of the LPSO phase is 18.44%, and the one-dimensional size of the phase is about 100 microns.

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Abstract

The invention discloses a regulation and preparation method of a LPSO phase in an Mg-Gd-Er-Zn-Zr alloy, and belongs to the technical field of heat treatment. The Mg-Gd-Er-Zn-Zr alloy is heated up to the medium temperature of 300-350 DEG C in a heat treatment furnace; the temperature is kept for 15-60 minutes; the quenching is performed by hot water of 70 DEG C; then, the Mg-Gd-Er-Zn-Zr alloy is heated up to the high temperature of 480-520 DEG C; the temperature is kept for 3-8 hours; the quenching is performed by the hot water of 70 DEG C; and finally, the Mg-Gd-Er-Zn-Zr alloy is heated up to the secondary-high temperature of 400-460 DEG C; the temperature is kept for 12-50 hours; and the quenching is performed by the hot water of 70 DEG C. The method not only can control the volume fraction and one-dimensional dimension of the LPSO phase in the alloy, but also can effectively eliminate the component segregation of the casting alloy. Through the control process, the volume fraction of the LPSO phase is 3.2-45.67%, the range of the one-dimensional dimension is 25-120 microns, the component segregation and thick primary tissues of the casting alloy can be obviously eliminated, and the mechanical performance of the alloy is obviously improved.

Description

technical field [0001] The invention relates to a process for regulating the LPSO phase content and one-dimensional size of a Mg-Gd-Er-Zn-Zr alloy, which belongs to the technical field of heat treatment. Background technique [0002] Because of its low density, high specific strength, specific stiffness, high damping performance and electromagnetic shielding performance, magnesium alloy is known as "the green engineering material of the 21st century" and is regarded as the hope of replacing steel materials in the field of automobile lightweight. However, due to the lack of an effective strengthening phase and an effective control method for controlling the volume of the second phase, the mechanical properties of magnesium alloys cannot meet the requirements of the main load-bearing structural materials, and the application is greatly limited. [0003] Japanese scholar Kawamura prepared the Mg-Zn-Y alloy containing LPSO phase by rapid solidification / powder metallurgy in 2001,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/00C22C23/06
Inventor 杜文博温凯刘轲王朝辉李淑波
Owner BEIJING UNIV OF TECH
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