CN102828134A - Three-level aging heat treatment process for nanometer magnesium alloy - Google Patents
Three-level aging heat treatment process for nanometer magnesium alloy Download PDFInfo
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Abstract
The invention relates to a three-level aging heat treatment process for nanometer magnesium alloy. The alloy comprises the following components in percentage by mass: 6-13% of gadolinium, 2-6% of yttrium, 0.3-0.8% of zirconium, and the balance of magnesium and inevitable impurities. The nanometer magnesium alloy obtained by extrusion-fast cold forging with average crystallite size of 40-100 nm is subjected to level 1 aging heat treatment at 140-170 DEG C for 4-8 hours, and then the alloy subjected to level 1 aging treatment is subjected to level 2 aging heat treatment at 150-180 DEG C for 5-10 hours, finally the alloy subjected to level 2 aging treatment is subjected to level 3 aging heat treatment at 200-250 DEG C for 10-30 hours. Compared with the nanometer magnesium alloy without aging treatment, the strength and the yield strength of the alloy subjected to three-level aging heat treatment is increased by 100-105 MPa and 123-135 MPa respectively, and the alloy has a strength of extension of 705-750 MPa and yield strength of 670-715 MPa.
Description
Technical field
The present invention relates to nano material thermal treatment field, three grades of aging thermal treating process of particularly a kind of nanometer Mg alloy.
Background technology
Nano material also is penetrated into all respects of life because its excellent physicals, chemical property and mechanical property have been applied to many high-tech areas.The nanometer Mg alloy not only has advantages such as high damping, height ratio that ordinary magnesium alloy has are strong, height ratio is firm, also has HS, good corrosion resisting property.Most of magnesiumalloy all belong to ageing strengthening type alloy, thereby further to improve the nanometer Mg alloy strength through timeliness thermal treatment be the key means that further improves the nanometer Mg alloy strength.
Do not have bibliographical information to explore the aging thermal treating process of nanometer Mg alloy at present, particularly be directed to extruding-quick cold forging and make the nanometer Mg alloy that makes.
Summary of the invention
The object of the invention is to provide a kind of nanometer Mg alloy three grades of aging thermal treating process.
Three grades of aging thermal treating process of nanometer Mg alloy of the present invention, said nanometer Mg alloying constituent is (w%): Gd:6-13%, Y:2-6%, Zr:0.3-0.8%, all the other are Mg and the impurity element that can not remove, comprise following concrete steps:
A. be that the nanometer Mg alloy of 40-100nm carries out the thermal treatment of one-level timeliness under 140 ℃-170 ℃ with average grain size, the treatment time is 4-8h;
B. the alloy after the one-level timeliness is carried out secondary time effect thermal treatment under 150-180 ℃, the treatment time is 5-10h.
C. at last the alloy behind the secondary time effect is carried out three grades of timeliness thermal treatments under 200-250 ℃, the treatment time is 10-30h.
The invention has the advantages that:
Because mechanical property sharply descended after magnesiumalloy crystal grain surpassed 100nm; Therefore nanometer Mg alloy and ordinary magnesium alloy aging thermal treating process difference are: crystal grain is too grown up; Promptly can not make grain-size surpass 100nm, but guarantee that again the ageing treatment of magnesiumalloy reaches the peak value timeliness.The invention has the advantages that to explore to strengthen adopts extruding-quick cold forging to make the best aging thermal treating process that the average grain size that makes is a 40-100nm nanometer Mg alloy; Adopt three grades of aging thermal treating process according to the invention that the nanometer Mg alloy is carried out ageing treatment; Magnesiumalloy crystal grain can not grown up, and can guarantee the inner peak value timeliness that takes place of magnesiumalloy.
The said extruding of this patent-quick cold forging is made the nanometer Mg alloy that makes under 140-170 ℃, carry out earlier the one-level timeliness.Two variations of the inner generation of nanometer Mg alloy in the one-level ag(e)ing process: most of internal stress that fast cold deformation causes is eliminated; Solute atoms begins to gather partially.Because the inner internal stress of alloy can make the alloy crystal boundary migration reduce, so if the inner internal stress of nanometer Mg alloy is not eliminated, grain growth when it will cause follow-up high-temperature aging.Therefore, the first step low temperature aging is indispensable.
Alloy after the said one-level timeliness of this patent is carried out secondary time effect thermal treatment under 150-180 ℃.In the secondary time effect treating processes, solute atoms further gathers partially, and the inner internal stress of nanometer Mg alloy obtains basically eliminate.Secondary time effect adopts comparatively high temps can eliminate internal forces more, and promotes that solute atoms gathers fast partially.
Alloy behind the said secondary time effect of this patent is carried out three grades of timeliness under 200-250 ℃, can promote the second rapid mutually forming core, and reach the peak value timeliness.
The nanometer Mg alloy strength improves 100-105MPa than the nonageing attitude after these three grades of timeliness thermal treatments, and ys improves 123-135MPa, and tensile strength reaches 705-750MPa, and ys reaches 670-715MPa.
Description of drawings
Fig. 1 is the nanometer Mg alloy product after the thermal treatment.
The present invention has been a large amount of contrast experiments through regulating above-mentioned parameter.Below in conjunction with accompanying drawing and embodiment the present invention is further specified.These embodiment are used to explain the present invention, rather than limitation of the present invention, conceive under the prerequisite in the present invention technology of the present invention is improved, and all belong to protection scope of the present invention.
Embodiment
Embodiment 1
With average grain size is that (alloying constituent is (w%): Gd:8%, Y:4%, Zr:0.5% for the nanometer Mg alloy of 50nm; All the other are Mg and the impurity element that can not remove) under 165 ℃, carry out first step ageing treatment; Aging time 5h carries out second stage ageing treatment, aging time 6h with the nanometer Mg alloy after the one-level ageing treatment again under 175 ℃; At last the alloy behind the secondary time effect is carried out three grades of ageing treatment, aging time 12h under 240 ℃.According to GB/T228-2002 to the aging state magnesiumalloy carry out Mechanics Performance Testing and with timeliness before alloy compare; The result shows; In contrast to nonageing nanometer Mg alloy, aging state magnesiumalloy room temperature tensile strength improves 102MPa, and ys improves 132MPa; Tensile strength is up to 749MPa, and ys is up to 710MPa.Concrete outcome is seen table 1.
Embodiment 2
With average grain size is that (alloying constituent is (w%): Gd:10%, Y:6%, Zr:0.4% for the nanometer Mg alloy of 70nm; All the other are Mg and the impurity element that can not remove) under 155 ℃, carry out first step ageing treatment; Aging time 6h carries out second stage ageing treatment, aging time 7h with the nanometer Mg alloy after the one-level ageing treatment again under 165 ℃; At last the alloy behind the secondary time effect is carried out three grades of ageing treatment, aging time 14h under 230 ℃.According to GB/T228-2002 to the aging state magnesiumalloy carry out Mechanics Performance Testing and with timeliness before alloy compare; The result shows; In contrast to nonageing nanometer Mg alloy, aging state magnesiumalloy room temperature tensile strength improves 105MPa, and ys improves 123MPa; Tensile strength is up to 739MPa, and ys is up to 692MPa.Concrete outcome is seen table 1.
Embodiment 3
With average grain size be 90nm the nanometer Mg alloy (alloying constituent is (w%): 12%, Y:3%, Zr:0.7%; All the other are Mg and the impurity element that can not remove) under 145 ℃, carry out first step ageing treatment; Aging time 7h carries out second stage ageing treatment, aging time 9h with the nanometer Mg alloy after the one-level ageing treatment again under 155 ℃; At last the alloy behind the secondary time effect is carried out three grades of ageing treatment, aging time 22h under 210 ℃.According to GB/T228-2002 to the aging state magnesiumalloy carry out Mechanics Performance Testing and with timeliness before alloy compare; The result shows; In contrast to nonageing nanometer Mg alloy, aging state magnesiumalloy room temperature tensile strength improves 100MPa, and ys improves 128MPa; Tensile strength is up to 710MPa, and ys is up to 675MPa.Concrete outcome is seen table 1.
Claims (7)
1. three grades of aging thermal treating process of a nanometer Mg alloy, said nanometer Mg alloy mass percentage composition is: Gd:6-13%, Y:2-6%; Zr:0.3-0.8%; All the other are Mg and the impurity element that can not remove, it is characterized in that: be that the cold forging of extruding-is fast made the average grain size that makes is that the nanometer Mg alloy of 40-100nm carries out the thermal treatment of one-level timeliness under 140-170 ℃, the treatment time is 4-8h; Alloy after the one-level timeliness is carried out secondary time effect thermal treatment under 150-180 ℃; Treatment time is 5-10h, and the alloy behind the secondary time effect is carried out three grades of timeliness thermal treatments under 200-250 ℃, and the treatment time is 10-30h; The nanometer Mg alloy strength improves 100-105MPa than the nonageing attitude after these three grades of timeliness thermal treatments; Ys improves 123-135MPa, and tensile strength reaches 705-750MPa, and ys reaches 670-715MPa.
2. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: it is that the nanometer Mg alloy of 40-60nm carries out the thermal treatment of one-level timeliness under 160-170 ℃ that the cold forging of said extruding-is fast made the average grain size that makes, and the treatment time is 4-6h; Nanometer Mg alloy after the one-level timeliness is carried out secondary time effect thermal treatment under 170-180 ℃, the treatment time is 5-7h; Nanometer Mg alloy behind the secondary time effect is carried out three grades of timeliness thermal treatments under 230-250 ℃, the treatment time is 10-14h.
3. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: said average grain size is that the nanometer Mg alloy of 40-60nm adopts 160-170 ℃/4-6h+170-180 ℃/5-7h+230-250 ℃/10-14h institution of prescription to handle back room temperature tensile strength and improve 100-105MPa than the nonageing attitude; Ys improves 130-135MPa; Tensile strength reaches 740-750MPa, and ys reaches 705-715MPa.
4. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: it is that the nanometer Mg alloy of 61-80nm carries out the thermal treatment of one-level timeliness under 150-160 ℃ that the cold forging of said extruding-is fast made the average grain size that makes, and the treatment time is 5-7h; Nanometer Mg alloy after the one-level timeliness is carried out secondary time effect thermal treatment under 160-170 ℃, the treatment time is 6-8h; Nanometer Mg alloy behind the secondary time effect is carried out three grades of timeliness thermal treatments under 220-240 ℃, the treatment time is 12-16h.
5. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: said average grain size is that the nanometer Mg alloy of 61-80nm adopts 150-160 ℃/5-7h+160-170 ℃/6-8h+220-240 ℃/12-16h institution of prescription to handle back room temperature tensile strength and improve 100-105MPa than the nonageing attitude; Ys improves 120-125MPa; Tensile strength reaches 735-740MPa, and ys reaches 690-700MPa.
6. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: it is that the nanometer Mg alloy of 81-100nm carries out the thermal treatment of one-level timeliness under 140-150 ℃ that the cold forging of said extruding-is fast made the average grain size that makes, and the treatment time is 6-8h; Nanometer Mg alloy after the one-level timeliness is carried out secondary time effect thermal treatment under 150-160 ℃, the treatment time is 8-10h; Nanometer Mg alloy behind the secondary time effect is carried out three grades of timeliness thermal treatments under 200-220 ℃, the treatment time is 16-30h.
7. according to three grades of aging thermal treating process of the said nanometer Mg alloy of claim 1; It is characterized in that: said average grain size is that the nanometer Mg alloy of 81-100nm adopts 140-150 ℃/6-8h+150-160 ℃/8-10h+200-220 ℃/16-30h institution of prescription to handle back room temperature tensile strength and carry 100-105MPa than the nonageing attitude; Ys improves 125-130MPa; Tensile strength reaches 705-715MPa, and ys reaches 670-680MPa.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467982A (en) * | 2018-07-07 | 2018-08-31 | 中南大学 | A kind of Mg-Gd-Y-Zr nanometer Mgs alloy aging heat treatment process |
| CN108486447A (en) * | 2018-07-07 | 2018-09-04 | 中南大学 | A kind of low rare earth nano magnesium alloy aging thermal treating process |
| CN108707847A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of low rare earth nano isomery magnesium alloy aging thermal treating process |
| CN108707803A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of VW93M nanometer Mgs alloy aging heat treatment process |
| CN108707848A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of VW93M nanometers of isomery magnesium alloy aging thermal treating process |
| CN108715965A (en) * | 2018-07-07 | 2018-10-30 | 中南大学 | A kind of atom segregation and elementide strengthen VW93M magnesium alloy methods |
| CN108728715A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of powerful block nanometer magnesium alloy preparation method of VW93M superelevation |
| CN108728714A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong nanometer isomery magnesium alloy preparation method of VW93M superelevation |
| CN108728711A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong Mg-Gd-Y-Zr nanometer gradients magnesium alloy preparation method of superelevation |
| CN108728710A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong nanometer gradient magnesium alloy preparation method of VW93M superelevation |
| CN108728716A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of powerful block Mg-Gd-Y-Zr nanometers of magnesium alloy preparation methods of superelevation |
| CN108754366A (en) * | 2018-07-07 | 2018-11-06 | 中南大学 | A kind of high thermal stability VW93M nanometers of magnesium alloy preparation methods |
| CN108754367A (en) * | 2018-07-07 | 2018-11-06 | 中南大学 | A kind of atom segregation and elementide strengthen Mg-Gd-Y-Zr magnesium alloy methods |
| CN108774722A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of nanometer of isomery magnesium alloy aging thermal treating process |
| CN108774721A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of Mg-Gd-Y-Zr nanometers of isomery magnesium alloy aging thermal treating process |
| CN108774719A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of nanometer Mg alloy aging heat treatment process |
| CN108796329A (en) * | 2018-07-07 | 2018-11-13 | 中南大学 | A kind of high thermal stability Mg-Gd-Y-Zr nanometers of magnesium alloy preparation methods |
| CN108796330A (en) * | 2018-07-07 | 2018-11-13 | 中南大学 | A kind of strong Mg-Gd-Y-Zr nanometers of isomery magnesium alloy preparation method of superelevation |
| CN111187998A (en) * | 2020-02-20 | 2020-05-22 | 齐鲁工业大学 | Method for regulating and controlling grain structure of ZK60 deformed magnesium alloy and improving performance |
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| WO2009039581A1 (en) * | 2007-09-28 | 2009-04-02 | Cast Crc Limited | Permanent mould cast magnesium alloy |
| CN101914712A (en) * | 2010-07-07 | 2010-12-15 | 中南大学 | Extrusion deformation process of high-strength magnesium alloy thick plate |
| CN102400071A (en) * | 2011-11-15 | 2012-04-04 | 中南大学 | Extrusion deformation technology for large-diameter high-strength heat resistant magnesium alloy pipes |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467982A (en) * | 2018-07-07 | 2018-08-31 | 中南大学 | A kind of Mg-Gd-Y-Zr nanometer Mgs alloy aging heat treatment process |
| CN108486447A (en) * | 2018-07-07 | 2018-09-04 | 中南大学 | A kind of low rare earth nano magnesium alloy aging thermal treating process |
| CN108707847A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of low rare earth nano isomery magnesium alloy aging thermal treating process |
| CN108707803A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of VW93M nanometer Mgs alloy aging heat treatment process |
| CN108707848A (en) * | 2018-07-07 | 2018-10-26 | 中南大学 | A kind of VW93M nanometers of isomery magnesium alloy aging thermal treating process |
| CN108715965A (en) * | 2018-07-07 | 2018-10-30 | 中南大学 | A kind of atom segregation and elementide strengthen VW93M magnesium alloy methods |
| CN108728715A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of powerful block nanometer magnesium alloy preparation method of VW93M superelevation |
| CN108728714A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong nanometer isomery magnesium alloy preparation method of VW93M superelevation |
| CN108728711A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong Mg-Gd-Y-Zr nanometer gradients magnesium alloy preparation method of superelevation |
| CN108728710A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of strong nanometer gradient magnesium alloy preparation method of VW93M superelevation |
| CN108728716A (en) * | 2018-07-07 | 2018-11-02 | 中南大学 | A kind of powerful block Mg-Gd-Y-Zr nanometers of magnesium alloy preparation methods of superelevation |
| CN108754366A (en) * | 2018-07-07 | 2018-11-06 | 中南大学 | A kind of high thermal stability VW93M nanometers of magnesium alloy preparation methods |
| CN108754367A (en) * | 2018-07-07 | 2018-11-06 | 中南大学 | A kind of atom segregation and elementide strengthen Mg-Gd-Y-Zr magnesium alloy methods |
| CN108774722A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of nanometer of isomery magnesium alloy aging thermal treating process |
| CN108774721A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of Mg-Gd-Y-Zr nanometers of isomery magnesium alloy aging thermal treating process |
| CN108774719A (en) * | 2018-07-07 | 2018-11-09 | 中南大学 | A kind of nanometer Mg alloy aging heat treatment process |
| CN108796329A (en) * | 2018-07-07 | 2018-11-13 | 中南大学 | A kind of high thermal stability Mg-Gd-Y-Zr nanometers of magnesium alloy preparation methods |
| CN108796330A (en) * | 2018-07-07 | 2018-11-13 | 中南大学 | A kind of strong Mg-Gd-Y-Zr nanometers of isomery magnesium alloy preparation method of superelevation |
| CN111187998A (en) * | 2020-02-20 | 2020-05-22 | 齐鲁工业大学 | Method for regulating and controlling grain structure of ZK60 deformed magnesium alloy and improving performance |
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