CN105331863A - Heat-resistant core-shell strengthening phase magnesium alloy and preparation method thereof - Google Patents
Heat-resistant core-shell strengthening phase magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to heat-resistant core-shell strengthening phase magnesium alloy. The chemical component of the heat-resistant core-shell strengthening phase magnesium alloy is Mg-xL-yM, wherein x and y are mass fractions, x is at least 7 and at most 15, and y is at least 0.1 and at most 1; L is one or two of Zn, Sn and Sc, when two elements coexist, the mass fractions are equal; M is one of Ca, Mn and Zr. The preparation method of the heat-resistant core-shell strengthening phase magnesium alloy comprises the following steps: preparing casting-state alloy ingot by vacuum induction melting, and then carrying out solid solution treatment for the magnesium alloy casting ingot, wherein the solid solution temperature is 380-510 DEG C, and the solid solution time is 8-18h; carrying out water quenching after solid solution; carrying out double aging for magnesium alloy under high pressure of 2-6GPa, wherein the temperature of the first time of aging is 300-800 DEG C, and the aging time is 8-36h; carrying out quenching after aging; the temperature of the second time of aging is 500-800 EG C, and the aging time is 8-24h; carrying out quenching after aging. The heat-resistant core-shell strengthening phase magnesium alloy has the advantages of being simple in process and low in cost, the strengthening phase with a core-shell structure separated out through double aging has good high temperature stability.
Description
Technical field
The present invention relates to a kind of Magnuminium and preparation method thereof.
Background technology
Mg-based hydrogen storage is the lightest structural metallic materials of current widespread use.It has low density, high specific strength and specific rigidity, good heat conductive performance, excellent capability of electromagnetic shielding, excellent damping capacity and be easy to the advantages such as recovery, has broad application prospects in aerospace, communications and transportation, electronics 3C and national defense and military fields.But the resistance to elevated temperatures of general magnesium alloy is poor, and working temperature can not more than 120 ~ 150 DEG C, and this just significantly limit its widespread use.The poor major cause of magnesium alloy high-temperature behavior is the Precipitation strengthening phase of traditional magnesium alloy, and can grow up gradually under the high temperature conditions, the intensity of magnesium alloy and creep-resistant property decline to a great extent and lose strengthening effect.
In recent years, be constantly developed and study along with rare-earth-contained magnesium alloy, the high-temperature behavior of magnesium alloy is improved.Magnesium rare earth (Mg-RE) alloy, by precipitation strength, separates out the second-phase of half metastable coherence or coherence to put forward heavy alloyed intensity at intracrystalline or grain boundaries.But alloy is strengthening phase size instability and skewness in use, causes the High-Temperature Strengthening effect of alloy to reduce.Rare earth element is expensive simultaneously, and the high temperature resistant magnesium alloy developed without rare earth element becomes study hotspot.
Summary of the invention
The object of the present invention is to provide heat-resisting nucleocapsid strengthening phase magnesium alloy of a kind of cost low and high temperature excellent performance and preparation method thereof.The strengthening phase that the present invention is mainly separated out by high pressure double aging technique has nucleocapsid structure, obtains heat-resisting nucleocapsid strengthening phase magnesium alloy.
The chemical composition of heat-resisting nucleocapsid strengthening phase magnesium alloy of the present invention is Mg-xL-yM, and wherein x and y is massfraction, 7≤x≤15,0.1≤y≤1, L be in Zn, Sn, Sc one or both, when 2 kinds of elements coexist, massfraction is equal; M is the one in Ca, Mn, Zr.
The preparation method of above-mentioned heat-resisting nucleocapsid strengthening phase magnesium alloy is as follows:
(1) vacuum induction melting technique is adopted to prepare the magnesium alloy ingot of mentioned component;
(2) in the electricity Zu Guanshi stove having argon shield, carry out solution treatment to above-mentioned magnesium alloy ingot, solid solubility temperature is 380 ~ 510 DEG C, and solution time is 8 ~ 18 hours, shrend after solid solution;
(3) under the condition of high voltage of 2GP ~ 6GPa, carry out double aging to the magnesium alloy of step (2), aging temp is 300 ~ 800 DEG C for the first time, and aging time is 8 ~ 36 hours, quenches after completion of prescription; Second time effect temperature is 500 ~ 800 DEG C, and aging time is 8 ~ 24 hours, quenches after completion of prescription; Quenchant is cold water.
The present invention compared with prior art tool has the following advantages:
1 compares with heat resistant magnesium-rare earth alloy, not containing rare earth element, the overall cost of magnesium alloy is declined.
2, technique is simple, just can obtain the required alloy with nucleocapsid structure strengthening phase by normal pressure solution treatment and high pressure double aging technique.
The strengthening phase with nucleocapsid structure of 3, being separated out by double aging has good high-temperature stability.
Accompanying drawing explanation
Fig. 1 is nucleocapsid structure precipitated phase formation basic theory schematic diagram in the present invention.
Fig. 2 is the age hardening curves figure of Mg-4Zn-4Sc-0.5Mn alloy in the embodiment of the present invention 1.
Fig. 3 is the Bright Field Transmission figure of Mg-7Sn-1Ca alloy in the embodiment of the present invention 2.
Fig. 4 is the High-Resolution Map of Mg (Sc, the Zr) phase of the nucleocapsid structure of separating out in Mg-15Sc-1Zr alloy in the embodiment of the present invention 3.
Embodiment:
Embodiment 1
Adopt vacuum induction melting technique to prepare Mg-4Zn-4Sc-0.5Mn alloy pig, above-mentioned magnesium alloy ingot is carried out solution treatment in the electricity Zu Guanshi stove having argon shield, and solid solubility temperature is 380 DEG C, and solution time is 18 hours, and solid solution terminates rear shrend; Magnesium alloy after quenching is carried out high pressure ageing treatment, timeliness pressure is 6GPa, first the temperature of timeliness is 800 DEG C, aging time is 8 hours, shrend after completion of prescription, and second time aging temp is 500 DEG C, aging time is 20 hours, shrend after completion of prescription, can obtain the Mg (Zn, Sc) of nucleocapsid structure
2strengthening phase.
As shown in Figure 1, core shape precipitated phase is separated out by high pressure preageing, on the basis of core shape precipitated phase, separate out shelly precipitated phase by high-voltage secondary timeliness again, the strengthening phase of this nucleocapsid structure has high thermostability in hot environment, thus greatly puies forward heavy alloyed resistance toheat.
As shown in Figure 2, compared to the alloy of 300 DEG C of single timeliness, through the Mg (Zn, Sc) with nucleocapsid structure prepared by double aging technique
2strengthening phase alloy has higher peak hardness.
Embodiment 2
Adopt vacuum induction melting technique to prepare Mg-7Sn-1Ca alloy pig, above-mentioned magnesium alloy ingot is carried out solution treatment in the electricity Zu Guanshi stove having argon shield, and solid solubility temperature is 510 DEG C, and solution time is 12 hours, and solid solution terminates rear shrend; Alloy after quenching is carried out high pressure ageing treatment, and timeliness pressure is 6GPa, and first the temperature of timeliness is 500 DEG C, aging time is 24 hours, shrend after completion of prescription, and second time aging temp is 800 DEG C, aging time is 8 hours, shrend after completion of prescription, can obtain the Mg with nucleocapsid structure
2the strengthening phase of (Sn, Ca).
As shown in Figure 3, obtained magnesium alloy has the Mg of nucleocapsid structure
2the strengthening phase of (Sn, Ca) is at intracrystalline and grain boundaries Dispersed precipitate, and the diameter of precipitated phase is about 15nm.
Embodiment 3
Adopt vacuum induction melting technique to prepare Mg-15Sc-1Zr alloy pig, above-mentioned magnesium alloy ingot is carried out solution treatment in the electricity Zu Guanshi stove having argon shield, and solid solubility temperature is 500 DEG C, and solution time is 8 hours, and solid solution terminates rear shrend; Alloy after quenching is carried out high pressure ageing treatment, timeliness pressure is 4GPa, first the temperature of timeliness is 400 DEG C, aging time is 36 hours, shrend after completion of prescription, and second time aging temp is 600 DEG C, aging time is 8 hours, shrend after completion of prescription, can obtain the strengthening phase of the Mg (Sc, Zr) with nucleocapsid structure.
As shown in Figure 4, the diameter of core shape precipitated phase is about 12nm, and the diameter of shelly precipitated phase is about 40nm.
Embodiment 4
Adopt vacuum induction melting technique to prepare Mg-6Sn-6Zn-0.1Zr alloy pig, above-mentioned magnesium alloy ingot is carried out solution treatment in the electricity Zu Guanshi stove having argon shield, and solid solubility temperature is 510 DEG C, and solution time is 12 hours, and solid solution terminates rear shrend.Alloy after quenching is carried out high pressure ageing treatment, and timeliness pressure is 2GPa, and first the temperature of timeliness is 300 DEG C, and aging time is 32 hours, shrend after completion of prescription; Second time aging temp is 600 DEG C, and aging time is 24 hours, shrend after completion of prescription, can obtain the Mg with nucleocapsid structure
2the strengthening phase of (Sn, Zn).
Claims (2)
1. a heat-resisting nucleocapsid strengthening phase magnesium alloy, is characterized in that: its chemical composition is Mg-xL-yM, and wherein x and y is massfraction, 7≤x≤15,0.1≤y≤1, L be in Zn, Sn, Sc one or both, when 2 kinds of elements coexist, massfraction is equal; M is the one in Ca, Mn, Zr.
2. the preparation method of the heat-resisting nucleocapsid strengthening phase magnesium alloy of claim 1, is characterized in that:
(1) vacuum induction melting technique is adopted to prepare the magnesium alloy ingot of mentioned component;
(2) in the electricity Zu Guanshi stove having argon shield, carry out solution treatment to above-mentioned magnesium alloy ingot, solid solubility temperature is 380 ~ 510 DEG C, and solution time is 8 ~ 18 hours, shrend after solid solution;
(3) under the condition of high voltage of 2GP ~ 6GPa, carry out double aging to the magnesium alloy of step (2), aging temp is 300 ~ 800 DEG C for the first time, and aging time is 8 ~ 36 hours, quenches after completion of prescription; Second time effect temperature is 500 ~ 800 DEG C, and aging time is 8 ~ 24 hours, quenches after completion of prescription; Quenchant is cold water.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119582A (en) * | 2016-06-23 | 2016-11-16 | 陕西友力实业有限公司 | Utilize the method that microwave sintering prepares Si-Mg alloy |
| CN106868368A (en) * | 2017-02-20 | 2017-06-20 | 岳阳宇航新材料有限公司 | A kind of degradable magnesium alloy downhole tool sealing ball material and preparation method thereof |
| CN107502801A (en) * | 2017-09-03 | 2017-12-22 | 王雯 | A kind of magnesium alloy with face coat |
| CN109706359A (en) * | 2019-03-12 | 2019-05-03 | 重庆文理学院 | A kind of high tough single-phase cast magnesium alloy and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956111A (en) * | 2010-10-21 | 2011-01-26 | 重庆大学 | Method for reinforcing ZK60 magnesium alloy by adding Sc |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956111A (en) * | 2010-10-21 | 2011-01-26 | 重庆大学 | Method for reinforcing ZK60 magnesium alloy by adding Sc |
Non-Patent Citations (2)
| Title |
|---|
| GAOHUI WU ET AL.: "A nanostructural design to produce high ductility of high volume fraction SiCp/Al composites with enhanced strength", 《MATERIALS AND DESIGN》 * |
| JIANXIN ZOU ET AL.: "Study on the hydrogen storage properties of coreeshell structured MgeRE (RE = Nd, Gd, Er)nano-composites synthesized through arc plasma method", 《HYDROGEN ENERGY》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119582A (en) * | 2016-06-23 | 2016-11-16 | 陕西友力实业有限公司 | Utilize the method that microwave sintering prepares Si-Mg alloy |
| CN106868368A (en) * | 2017-02-20 | 2017-06-20 | 岳阳宇航新材料有限公司 | A kind of degradable magnesium alloy downhole tool sealing ball material and preparation method thereof |
| CN107502801A (en) * | 2017-09-03 | 2017-12-22 | 王雯 | A kind of magnesium alloy with face coat |
| CN107502801B (en) * | 2017-09-03 | 2019-03-12 | 昆山英思捷精密电子有限公司 | A kind of magnesium alloy with surface covering |
| CN109706359A (en) * | 2019-03-12 | 2019-05-03 | 重庆文理学院 | A kind of high tough single-phase cast magnesium alloy and preparation method thereof |
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