CN1566395A - Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction - Google Patents
Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction Download PDFInfo
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- CN1566395A CN1566395A CN 03132471 CN03132471A CN1566395A CN 1566395 A CN1566395 A CN 1566395A CN 03132471 CN03132471 CN 03132471 CN 03132471 A CN03132471 A CN 03132471A CN 1566395 A CN1566395 A CN 1566395A
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- magnesium alloy
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- spherocrystallization
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Abstract
The invention disclose a composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction which comprises, subjecting the magnesium alloy to non-equal radius track curve compression, developing large shearing deformation evoking, and heating to semi-solid phase temperature zone for isothermal treatment.
Description
Technical field the present invention proposes a kind of preparation method of magnesium alloy semi solid state base.
The present magnesium alloy semi solid state of background technology is shaped and also is in the laboratory study stage, does not have industrial application.Mainly be because the special chemical property of magnesium alloy and crystalline structure determine.Magnesium alloy chemical character is active, is easy to oxidation, adds that its point of ignition is very low, greatly near liquidus line; And the magnesium alloy crystalline structure is a close-packed hexagonal structure, and plastic deformation ability is very poor, and this will influence its blank-making technology.Liquid phase mechanical stirring, induction stirring be the expense height not only, and the technological operation complexity.The billet size of preparation also is restricted, and for example induction stirring can only be produced the following blank of Φ 150mm.SIMA (Strain Induced-Melting Activation) method has the potentiality of industrial application, but because pre-mushrooming deformation can not produce big viscous deformation for the material that magnesium alloy is highly brittle like this.So just limited the size of blank.
The present invention be directed to the deficiency of magnesium alloy special nature and existing base technology, propose a kind of curve extruding-shear-induced isothermal spherocrystallization semisolid blank preparation method that do not wait.
The tissue signature of summary of the invention semi-solid blank is: tiny, non-dendritic structure.And under normal conditions, the alloy of nearly all industrial application all forms with dendrite.The principle of the invention: magnesium alloy is carried out grain refining and produce big viscous deformation inducing, be heated to the semi-solid state warm area then and carry out the isothermal spheroidizing processing.1. crystal grain thinning.Because the magnesium alloy crystalline structure is a close-packed hexagonal structure, plastic deformation ability is poor, and tiny crystal grain can increase plastic deformation ability, and semi-solid state spheric grain size is had good refining effect.Otherwise if the magnesium alloy original structure is thick, semisolid non-dendritic is organized also thickly so, and the thixotropy of blank is descended, and finally can have a strong impact on the mechanical property of product.2. producing big viscous deformation induces.The distortion of pre-upsetting in traditional SIMA method is used on magnesium alloy and is restricted, and is difficult to obtain predeformation and induces.Even under the thick condition of hot pier, distortion also must be very little, otherwise will crack.But, adopt and do not wait the curve extruding then can produce big predeformation magnesium alloy.Because as shown in drawings: blank is the hot extrusion deformation through having certain extrusion ratio earlier, because distortion is what to carry out under the condition of three-dimensional compressive stress, so produced certain compression set; Through and produce big shearing strain when the blank that extruding passes through bend more again.The magnesium alloy strand has produced compression set and big shearing strain is induced simultaneously like this.3. isothermal spheroidizing.Behind the semi-solid state warm area, be incubated certain hour through the blank heating behind the excessive deformation inductdion, can obtaining globular crystal tissue well tiny, homogenization.At this moment blank can be put preservation in storage, has been equipped with later thixotropic forming, also can directly put into mould and form.
Processing parameter of the present invention:
1. extrusion ratio: between the 1.2-2.0;
2. push number of times: 3-5 time;
3. semi-solid isothermal treatment temp: 550 ℃-580 ℃, soaking time is looked concrete billet size and holding temperature changes between 10min-40min.
Appended drawings is the used curve extruding-shear-induced structure drawing of device that do not wait among the present invention.
Wherein each several part comprises: 1-punch, 2-magnesium alloy strand, 3-die
Embodiment AZ91D magnesium alloy does not wait preparation of curve extruding-shear-induced isothermal spherocrystallization semisolid blank and thixotropic forming test
Strand bar specification: Φ 100 * 150mm
Tissue: grain fineness number＞150 μ m
Mechanical property: under the normal temperature state, σ
b＜150Mpa, δ＜2%
Through (extrusion ratio is 1.5, circulation extruding 4 times) after not waiting curve extruding-shearing strain
Tissue: grain fineness number＜20 μ m
Mechanical property: under the normal temperature state, σ
b＞250Mpa, δ＞5%
Handle (isothermal temperature is respectively 550 ℃, 560 ℃, 570 ℃, 580 ℃, and soaking time is respectively 25min, 20min, 15min, 10min) through semi-solid isothermal
The semisolid blank tissue: grain fineness number＜20 μ m, grain-size homogenization degree is very high, and shape factor is 1.5～1.2
Mechanical property behind the thixotropic forming: σ
b＞270MPa, δ＞5%
Claims (1)
1. a sharp magnesium alloy does not wait curve extruding-shear-induced isothermal spherocrystallization semisolid blank preparation method, it is characterized in that realizing according to the following steps:
The first step: the magnesium alloy cylindrical billet is processed into needed size.
Second step: carry out not waiting the curve extruding, wherein extrusion ratio remains between the 1.5-2.0, and bend extruding angle is 90 °, and the circulation extruding is 3-4 time repeatedly.
The 3rd step: the bar after will pushing cuts into blank by the parts quality size.
The 4th step: blank is put into process furnace carry out isothermal processes, holding temperature is that soaking time is looked concrete base size and holding temperature changes between 10min-40min, and uses argon shield between 550 ℃-580 ℃.
The 5th step: with the taking-up carrying out of the blank after isothermal processes thixotropic forming.
The 6th step: product is ejected from mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031324711A CN100360700C (en) | 2003-06-30 | 2003-06-30 | Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031324711A CN100360700C (en) | 2003-06-30 | 2003-06-30 | Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1566395A true CN1566395A (en) | 2005-01-19 |
| CN100360700C CN100360700C (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031324711A Expired - Fee Related CN100360700C (en) | 2003-06-30 | 2003-06-30 | Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347331C (en) * | 2005-03-28 | 2007-11-07 | 南昌大学 | Method for AZ61 magnesium alloy semi-solid blank |
| CN100366380C (en) * | 2005-07-20 | 2008-02-06 | 哈尔滨工业大学 | Method of comtinuously preparing alloy semi solid rod and its device |
| CN102198501A (en) * | 2010-12-06 | 2011-09-28 | 南昌大学 | Thixotropic plastic forming method for metal alloy |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850376B (en) * | 2010-06-08 | 2012-07-25 | 常州工学院 | Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266057A (en) * | 2001-03-08 | 2002-09-18 | Mitsubishi Alum Co Ltd | Method for producing magnesium alloy sheet having excellent press formability |
| CN1214128C (en) * | 2001-09-05 | 2005-08-10 | 中国科学院金属研究所 | Prepn process of deformed magnesium alloy with superfine grain structure |
-
2003
- 2003-06-30 CN CNB031324711A patent/CN100360700C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347331C (en) * | 2005-03-28 | 2007-11-07 | 南昌大学 | Method for AZ61 magnesium alloy semi-solid blank |
| CN100366380C (en) * | 2005-07-20 | 2008-02-06 | 哈尔滨工业大学 | Method of comtinuously preparing alloy semi solid rod and its device |
| CN102198501A (en) * | 2010-12-06 | 2011-09-28 | 南昌大学 | Thixotropic plastic forming method for metal alloy |
| CN102198501B (en) * | 2010-12-06 | 2012-11-21 | 南昌大学 | Thixotropic plastic forming method for metal alloy |
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| Publication number | Publication date |
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| CN100360700C (en) | 2008-01-09 |
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Granted publication date: 20080109 |