CN102251199B - Stress-induced multistage solid solution treatment process for Mg-Gd-Er-Zr alloy - Google Patents

Stress-induced multistage solid solution treatment process for Mg-Gd-Er-Zr alloy Download PDF

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CN102251199B
CN102251199B CN2011101950065A CN201110195006A CN102251199B CN 102251199 B CN102251199 B CN 102251199B CN 2011101950065 A CN2011101950065 A CN 2011101950065A CN 201110195006 A CN201110195006 A CN 201110195006A CN 102251199 B CN102251199 B CN 102251199B
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alloy
temperature
solid solution
stress
solution treatment
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CN102251199A (en
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杜文博
王旭东
王朝辉
李淑波
刘轲
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention discloses a stress-induced multistage solid solution treatment process for an Mg-Gd-Er-Zr alloy, belonging to the field of metal material heat treatment and comprising the following steps of: firstly, applying a tensile stress of 50MPa to an alloy to be treated and keeping the tensile stress for 30 minutes; secondly, heating the alloy to be 490DEG C and maintaining the temperature for 1 hour; thirdly, raising the temperature of the alloy to be 510DEG C and maintaining the temperature for 30 minutes; and finally, reducing the temperature of the alloy to be 490DEG C and maintaining the temperature for 30 minutes, taking out and quenching with warm water of 80DEG C. In the method, aiming at the characteristics of an Mg-Gd-Er-Zr system alloy and by adopting residual stress conditions for inducing and a multistage temperature solid solution, a microstructure of the alloy is greatly improved, the mechanical property of the alloy is improved, and advantageous conditions are provided for hot working or machining.

Description

A kind of stress induced multistage solid solution treatment process that is used for the Mg-Gd-Er-Zr alloy
Technical field
The present invention relates to a kind of Mg-Gd-Er-Zr of being used for heat treatment of alloy method, belong to metallic substance thermal treatment field.
Background technology
Magnesiumalloy excellent property, and have many performances that are superior to other common metal materials is like high specific strength, high specific stiffness, favorable damping ability, good thermal conductivity and electroconductibility, good dimensional stability, electromagnetic wave shielding be easy to characteristics such as recovery.In recent years; Along with energy-conservation and enhancing environmental consciousness; The Application of Magnesium scope constantly enlarges; Except that aviation and car industry field, in electronic product, power tool, household electrical appliance, medical treatment, exerciser and leisure goods, all be widely used, be described as " the green engineering material of 21 century ".
REE has its unique effect owing to have unique configuration of extra-nuclear electron in metallurgy, field of materials.It can improve alloy structure, raising alloy room temperature and mechanical behavior under high temperature, enhancing alloy corrosion resistance etc.In the magnesiumalloy field, the purification of REE, enhanced performance are developed a series of magnesiumalloy that contain rare earth constantly by people understanding with grasp, and they have distinctive performance such as high-strength, heat-resisting, anti-corrosion, can expand the Application of Magnesium field.Magnesium and REE can form a series of intermetallic compound; Be distributed in (the Aghinoe of crystal boundary place with the disperse of eutectic phase compound form; Bronfinb; Eliezerd.The Art of Development New Magnesium Alloys for High Temperature Applications.Materials Science Forum.2003,419-422 (1): 407~418 and Li Yi, Cheng Peiyuan; The China woods. the application of magnesiumalloy in automotive industry and 3C Product. Jiangxi non-ferrous metal .2007,21 (2): 30~34).In order to improve the mechanical property of magnesium-rare earth, often to carry out solution treatment to alloy, improve the solid solution of REE in alloy, to strengthen the effect that its timeliness is separated out.Solution treatment is mainly according to the eutectic temperature of alloy self in theory; Too high or the overlong time of temperature can cause organizing thick; Influence performance, the serious burning that also can produce makes product rejection, and temperature is crossed low or the time too shortly can be caused alloying element solid solution fully; During ageing treatment again less than the intensity (A.Luo.Magnesium Automotive Application.Sinomag Die Casting Magnesium Seminar.Shanghai, 2001:26~28) of needs.But in the actually operating, the selection of solid solubility temperature also will receive, the situation of solidifying of material, decisions such as distortion situation and scantling.And traditional solid solution treatment method; Because do not consider the influence of material deformation to solution treatment; Only consider the eutectic temperature and the dimensional effect of material itself, often needed higher temperature and long treatment time, therefore in the solution treatment process; The crystal grain of matrix alloy is compared the obvious length of casting attitude meeting; Influenced the performance (patent ZL00113246.6 and B.L.Mordike, T.Ebert.Magnesium:Properties-Application-Potential.Mater ials Science and Engineering A.2001.2001,302:37~45) of alloy.
Summary of the invention
The present invention is directed to the deficiency of existing magnesium-rare earth solution treatment; A kind of solid solution treatment process of the Mg-Gd-Er-Zr of can be used for alloy has been proposed; It passes through stress application on the specific direction of pending material in advance; Adopt 3 grades of temperature controlled methods then, Mg-Gd-Er-Zr system alloy is heat-treated.Present method is to the characteristics of Mg-Gd-Er-Zr system alloy; Employing unrelieved stress condition is induced, and the way of multistage temperature solid solution, has improved the microtexture of alloy greatly; Improve the mechanical property of alloy, and be next hot-work or the machining condition of providing convenience.
A kind of stress induced multistage solid solution treatment process that is used for the Mg-Gd-Er-Zr alloy of the present invention is characterized in that, may further comprise the steps:
At first pending alloy is implemented the 50MPa tensile stress and kept 30min; Then alloy is heated to 490 ℃ and be incubated 1h; Then alloy is warming up to 510 ℃ and be incubated 30min; At last alloy is cooled to 490 ℃ and be incubated 30min, take out with 80 ℃ of warm water quenchings.
The stress of the present invention through applying in advance; Make the intercrystalline of alloy produce stress concentration; Utilize REE Gd and Er to receive the characteristics of alloy defect influence easily, improved the velocity of diffusion of intercrystalline second phase middle-weight rare earths element Gd and Er, so the solid solution temperature and the time of having reduced alloy; Cooperate suitable multistage solid solution treatment process, further effectively raise alloy solid solution efficient.Present method has effectively reduced the temperature and time of the solid solution of alloy, has improved the alloy organizing performance, has also reduced production cost simultaneously.
Description of drawings
Fig. 1 is the casting attitude metallograph of Mg-11Gd-2Er-0.4Zr alloy in the embodiment of the invention;
Fig. 2 is that the Mg-11Gd-2Er-0.4Zr alloy adopts the metallograph after traditional solid dissolving method is handled;
Fig. 3 is that the Mg-11Gd-2Er-0.4Zr alloy adopts the metallograph after the inventive method is handled in the embodiment of the invention 1;
Fig. 4 is that the Mg-8Gd-2Er-0.4Zr alloy adopts the metallograph after the inventive method is handled in the embodiment of the invention 2.
Shown in accompanying drawing Fig. 1, be the typical cast structure pattern of the Mg-Gd-Er-Zr alloy mentioned among the present invention, its intercrystalline has tangible rare earth compound second phase, and grain-size is about 50um.Accompanying drawing Fig. 2 adopts traditional solid solution treatment method to handle back alloy organizing shape appearance figure, and specifically technology is 510 ℃ and is incubated 6h, though visible intercrystalline rare earth compound second obviously disappears mutually, grain-size has reached 200-300um, obviously long.Accompanying drawing Fig. 3, the 4th, the alloy structure shape appearance figure that adopts mode of the present invention to handle, visible not only intercrystalline rare earth compound second obviously disappears mutually, and grain-size has been controlled at about 80um.
Specific embodiment
The present invention makes further description through following concrete embodiment to technical scheme of the present invention.
Embodiment 1
1. tested alloys is Mg-11Gd-2Er-0.4Zr, and its alloying constituent (calculating by weight percentage) is: Gd=10.6%, and Er=2.1%, Zr=0.4%, Mg are surplus, and its pattern such as accompanying drawing are shown in Figure 1, and visible intercrystalline is the second thick phase;
2. pending alloy is applied the tensile stress of 50MPa on material-testing machine, and keep 30min;
The alloy that 3. will exert stress is heated to 490 ℃ and be incubated 1h in heat treatment furnace;
4. then alloy is warming up to 510 ℃ and be incubated 30min;
5. at last with alloy cool to 490 ℃ and be incubated 30min after, take out with 80 ℃ of warm water quenchings.
The alloy structure such as the accompanying drawing that obtain are shown in Figure 3, and the second thick phase of visible intercrystalline has all incorporated matrix, and crystal grain is not obviously grown up.
Embodiment 2
1. tested alloys is Mg-8Gd-2Er-0.4Zr, and its alloying constituent (calculating by weight percentage) is: Gd=8.1%, and Er=1.9%, Zr=0.4%, Mg are surplus;
2. pending alloy is applied the tensile stress of 50MPa on material-testing machine, and keep 30min;
The alloy that 3. will exert stress is heated to 490 ℃ and be incubated 1h in heat treatment furnace;
4. then alloy is warming up to 510 ℃ and be incubated 30min;
5. at last with alloy cool to 490 ℃ and be incubated 30min after, take out with 80 ℃ of warm water quenchings.
6. the alloy structure such as the accompanying drawing that obtain are shown in Figure 4, and the second thick phase of visible intercrystalline has all incorporated matrix, and crystal grain is not obviously grown up.

Claims (1)

1. a stress induced multistage solid solution treatment process that is used for the Mg-Gd-Er-Zr alloy is characterized in that, may further comprise the steps: at first pending alloy is implemented the 50MPa tensile stress and kept 30min; Then alloy is heated to 490 ℃ and be incubated 1h; Then alloy is warming up to 510 ℃ and be incubated 30min; At last alloy is cooled to 490 ℃ and be incubated 30min, take out with 80 ℃ of warm water quenchings;
Above-mentioned Mg-Gd-Er-Zr alloy is Mg-11Gd-2Er-0.4Zr or Mg-8Gd-2Er-0.4Zr.
CN2011101950065A 2011-07-12 2011-07-12 Stress-induced multistage solid solution treatment process for Mg-Gd-Er-Zr alloy Expired - Fee Related CN102251199B (en)

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CN102676961B (en) * 2012-05-17 2013-07-31 中北大学 Heat treatment method of copper-rich cast hypoeutectic aluminum-silicon alloy
CN104745989A (en) * 2013-12-30 2015-07-01 北京有色金属研究总院 Two-stage solid solution heat treatment method of copper chromium zirconium system alloy
CN109609825B (en) * 2018-12-28 2021-01-08 北京工业大学 Method for preparing ultrahigh-strength magnesium alloy by adopting pre-stretching composite two-stage aging process

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CN101135031A (en) * 2007-10-18 2008-03-05 重庆大学 Thermal treatment process for magnesium-zinc-manganese series deformation magnesium alloy
CN101575689A (en) * 2009-06-12 2009-11-11 北京工业大学 Heat treatment method of Al-Mg-Zr-Er alloy

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KR20020078936A (en) * 2001-04-11 2002-10-19 학교법인연세대학교 Quasicrystalline phase hardened Mg-based metallic alloy exhibiting warm and hot formability

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101135031A (en) * 2007-10-18 2008-03-05 重庆大学 Thermal treatment process for magnesium-zinc-manganese series deformation magnesium alloy
CN101575689A (en) * 2009-06-12 2009-11-11 北京工业大学 Heat treatment method of Al-Mg-Zr-Er alloy

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JP特开2002-309332A 2002.10.23

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