CN102618766B - Preparation method of quasi-crystal enhanced high-strength magnesium-zinc-yttrium (Mg-Zn-Y) alloy - Google Patents
Preparation method of quasi-crystal enhanced high-strength magnesium-zinc-yttrium (Mg-Zn-Y) alloy Download PDFInfo
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Abstract
The invention relates to a high-strength magnesium alloy and a preparation method thereof, in particular to an enhanced high-strength magnesium-zinc-yttrium (Mg-Zn-Y) alloy capable of precipitating small similarly-spherical quasi-crystal phase through solution and aging. The mass percent of chemical elements in the alloy is that: 5 to 6 percent of Zn, 1 percent of Y, Mg supplementing the percentage to 100 percent, and the mass ratio of the Zn and Y falls in between 5 and 6. Zn is added in a form of pure Zn, Y is added in a Mg-Y master-alloy form with Y content of 25 percent by weight, and Mg adopts the industrial pure magnesium. The alloy prepared through preheating, smelting, refining, metal forming and heat treatment consists of alpha-Mg solid melt and icosahedron quasi-crystal phase, the shape of the quasi-crystal phase is similar to a spherical shape, and the size is small. The precipitated quasi-crystal particles are propped against dislocated intermediate pinning and a firm interfaces with a substrate, so that the magnesium alloy can be remarkably strengthened. The tensile strength of the high-strength magnesium alloy is more than 250MPa, and the elongation rate is more than5 percent. Due to the adoption of the quasi-crystal enhanced high-strength Mg-Zn-Y alloy and the preparation method thereof, the high-strength magnesium can be widely popularized to use in fields such as aviation, aerospace, traffics and the like.
Description
Technical field
The present invention relates to the preparation method of high-strength magnesium alloy material and technology of preparing, particularly a kind of quasicrystal reinforced magnesium alloy.
Technical background
Magnesium alloy is the lightest structural metallic materials during engineering is used, and is described as " 21st century green engineering structural metallic materials ".Along with the fast development in fields such as Aeronautics and Astronautics, traffic, the strong magnesium alloy of lightweight height ratio is had higher requirement in recent years, on alloy designs, advanced machining technology, seek new breakthrough thereby force people to have to try every means.The Mg-Zn-Y alloy is a kind of very promising high strength and low cost magnesium alloy, mainly is because this alloy just can obtain having the icosahedral quasicrystal phase (I-phase) of high powerful feature under the routine casting condition.The two-phase coexistent district that has accurate crystalline substance and α-Mg in the Mg-Zn-Y ternary alloy system, this contains accurate brilliant high-performance Mg-Zn-Y alloy to exploitation and has the important engineering meaning.Yet the accurate crystalline phase that is herring-bone form in the Mg-Zn-Y alloy that adopts the routine casting method to prepare is very thick, material mechanical performance is difficult to the contribution that provides useful.
Summary of the invention
The present invention mainly is at above deficiency, provides a kind of particle the accurate brilliant preparation method who strengthens high-strength magnesium alloy.Technical scheme of the present invention is:
(1) select the Mg-Zn-Y alloy, chemical element mass percent in this alloy: 5.0-6.0% Zn, 1.0% Y, surplus is Mg, and Zn and Y mass ratio can guarantee to obtain in the as-cast structure accurate brilliant and α-Mg two-phase like this between 5 ~ 6.
(2) crucible is preheating to 200 ℃, brushes general magnesium alloy smelting crucible coating.Crucible is heated to 500 ℃, joins technical pure Mg in the crucible and begin to feed the CO2+0.5vol%SF6 mixed gas and protect.Continue to be warmed up to 720 ℃ treat that pure magnesium melts fully after, add pure Zn, the Mg-25wt.%Y master alloy; Mg-25wt.%Y master alloy adding mode is for to be pressed in the alloy melt with iron bell jar, and slightly to around move about, prevent the poly-partially of rare earth, rare earth is diffused in the liquation rapidly equably.Pure Zn just can take out bell jar after being pressed into the alloy melt bottom with bell jar.Be warmed up to 750 ℃ and be incubated 20 ~ 30 minutes, treat that master alloy, pure Zn melt fully, carry out the melt refining treatment with C2Cl6, slagging-off and cool the temperature to 700 ℃ after the refining pours into the moulding of air cooling metal mold.The whole smelting and pouring process of alloy is all carried out under CO2+0.5vol%SF6 is mixed gas protected.
(3) heat-treat.Alloy is at first 450 ℃ of following solid solutions 16 hours, then 500 ℃ of solid solutions 20 hours.After treating solution treatment, the artificial aging that sample carried out under 360 ℃ 24 hours is handled.Adopting the reason of segmentation solid solution is to make the abundant solid solution of accurate crystalline phase of difficult solid solution enter matrix.Obtain the accurate brilliant of approximate spherical fine size after the timeliness, can play obvious strengthening effect.
The high-strength magnesium alloy of the present invention's preparation, its benefit is: strength of alloy is greater than 250MPa, and unit elongation is greater than 5%.
In the Mg-Zn-Y ternary alloy system, there is the two-phase coexistent district of accurate crystalline substance and α-Mg, this contains accurate brilliant high-performance Mg-Zn-Y to exploitation and has the important engineering meaning.The accurate brilliant enhancing high-performance Mg-Zn-Y series magnesium alloy crystal grain of routine casting is generally comparatively thick, isolates matrix easily, causes alloy mechanical property on the low side.In order to improve accurate brilliant thick problem, the present invention at first controls as cast condition accurate brilliant form and distribution by permanent mold casting, because the chilling action of metal mold, the alloy rate of cooling is very big, limited growing up of accurate crystalline substance, to a certain extent refinement accurate crystalline substance and it is disperseed preferably.Secondly, prepare to contain by heat treating method again and separate out accurate brilliant enhanced Mg-Zn-Y alloy.In heat treatment process, we have adopted the segmentation solid solution treatment process, make the accurate crystalline substance of as cast condition to greatest extent solid solution enter behind the matrix again timeliness and separate out, the accurate crystalline phase of separating out has tiny, the approximate globular feature of size can significantly improve alloy strength.
The high strength that accurate brilliant enhancing Mg-Zn-Y is an alloy is mainly derived from the strengthening effect of quasicrystal particle, and is accurate brilliant in forming stable accurate crystalline substance/magnesium matrix interface and the strong pinning of dislocation being realized alloy strengthening.
Embodiment
Embodiment 1
Present embodiment is a kind of high-strength Mg-Zn-Y alloy, and its composition is Mg-5wt.%Zn-1wt.%Y, and Zn and Y mass ratio are 5, and wherein Zn adds with industrial Zn, and Y adds with the Mg-25wt.%Y master alloy, and Mg then adopts pure magnesium.
The preparation method of present embodiment is:
The first step is preheating to 200 ℃ with crucible, brushes general magnesium alloy smelting crucible coating;
Second step was heated to 500 ℃ with crucible, joined technical pure Mg in the crucible and began to feed the CO2+0.5vol%SF6 mixed gas and protect;
In the 3rd step, after continuing to be warmed up to pure magnesium and melting fully, add Zn, Mg-25wt.%Y master alloy at 720 ℃.Mg-25wt.%Y master alloy adding mode is for to be pressed in the alloy melt with iron bell jar, and slightly to around move about, prevent the poly-partially of rare earth, rare earth is diffused in the liquation rapidly equably.Pure Zn just can take out bell jar after being pressed into the alloy melt bottom with bell jar.
The 4th step was warmed up to 750 ℃ and be incubated 20 ~ 30 minutes, treated that master alloy, pure Zn melt fully;
The 5th the step, carry out the melt refining treatment with C2Cl6, after the refining slagging-off and cool the temperature to 700 ℃, pour into the moulding of air cooling metal mold; The whole smelting and pouring process of alloy is all carried out under CO2+0.5vol%SF6 is mixed gas protected.
In the 6th step, heat-treat.Alloy at first, is followed 500 ℃ of solid solutions 20 hours after 16 hours 450 ℃ of following solid solutions.After treating solution treatment, the artificial aging that sample carried out under 360 ℃ 24 hours is handled.Timeliness is organized as α-Mg sosoloid, and its inside tiny I-phase that distributing, and accurate crystalline form attitude is approximate spherical.
Alloy sample is carried out mechanics property analysis, and the result shows that the maximum tensile strength of this alloy room temperature is 246MPa, and yield strength is 60MPa, and unit elongation is 7.4%.
Embodiment 2
Present embodiment is a kind of high-strength Mg-Zn-Y alloy, and it becomes and is Mg-6wt.%Zn-1wt.%Y, and Zn and Y mass ratio are 6, and wherein Zn adds with industrial Zn, and Y adds with the Mg-25wt.%Y master alloy, and Mg then adopts pure magnesium.
The preparation method of present embodiment is:
The first step is preheating to 200 ℃ with crucible, brushes general magnesium alloy smelting crucible coating;
Second step was heated to 500 ℃ with crucible, joined technical pure Mg in the crucible and began to feed the CO2+0.5vol%SF6 mixed gas and protect;
In the 3rd step, after continuing to be warmed up to pure magnesium and melting fully, add Zn, Mg-25wt.%Y master alloy at 720 ℃.Mg-25wt.%Y master alloy adding mode is for to be pressed in the alloy melt with iron bell jar, and slightly to around move about, prevent the poly-partially of rare earth, rare earth is diffused in the liquation rapidly equably.Pure Zn just can take out bell jar after being pressed into the alloy melt bottom with bell jar;
The 4th step was warmed up to 750 ℃ and be incubated 20 ~ 30min, treated that master alloy, pure Zn melt fully;
The 5th the step, carry out the melt refining treatment with C2Cl6, after the refining slagging-off and cool the temperature to 700 ℃, pour into the moulding of air cooling metal mold.The whole smelting and pouring process of alloy is all carried out under CO2+0.5vol%SF6 is mixed gas protected;
In the 6th step, heat-treat.Alloy at first, is followed 500 ℃ of solid solutions 20 hours after 16 hours 450 ℃ of following solid solutions.After treating solution treatment, the artificial aging that sample carried out under 360 ℃ 24 hours is handled.
The alloy aging tissue is similarly α-Mg sosoloid, its inside tiny I-phase that distributing, and accurate crystalline form attitude is approximate spherical.Alloy sample is carried out mechanics property analysis, and the result shows that the maximum tensile strength of this alloy room temperature is 266MPa, and yield strength is 62MPa, and unit elongation is 7%.
Claims (1)
1. accurate brilliant preparation method who strengthens high-strength magnesium alloy is characterized in that:
Select the Mg-Zn-Y alloy, chemical element mass percent in this alloy: 5.0-6.0% Zn, 1.0% Y, surplus is Mg, and Zn and Y mass ratio are between 5 ~ 6, and wherein Zn adds with pure Zn, and Y adds with Mg-25wt.%Y master alloy form, Mg then adopts pure magnesium, and preparation process is:
The first step is preheating to 200 ℃ with crucible, brushes general magnesium alloy smelting crucible coating;
Second step was heated to 500 ℃ with crucible, joined technical pure Mg in the crucible and began to feed CO
2+ 0.5vol%SF
6Mixed gas is protected;
The 3rd the step, continue to be warmed up to 720 ℃ treat that pure magnesium melts fully after, add pure Zn, the Mg-25wt.%Y master alloy;
In the 4th step, be warmed up to 750 ℃ and be incubated 20 ~ 30 minutes and treat that master alloy, pure Zn melt fully;
In the 5th step, use C
2Cl
6Carry out the melt refining treatment, after the refining slagging-off and cool the temperature to 700 ℃, pour into moulding in the metal type dies, the whole smelting and pouring process of alloy is all at CO
2+ 0.5vol%SF
6Carry out under mixed gas protected;
The 6th step, to heat-treat, alloy at first, is followed 500 ℃ of solid solutions 20 hours after 16 hours 450 ℃ of following solid solutions, and after the solution treatment, the artificial aging that sample carried out under 360 ℃ 24 hours is handled.
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| CN103320663B (en) * | 2013-05-31 | 2015-06-24 | 中国科学院金属研究所 | Quasicrystal-containing magnesium alloy with high corrosion resistance and preparation method and application thereof |
| CN103993213B (en) * | 2014-05-27 | 2017-11-14 | 华东交通大学 | A kind of preparation method of double special construction phase composite strengthening Mg Zn y alloys |
| CN105714132B (en) * | 2014-12-03 | 2018-10-23 | 华东交通大学 | A kind of preparation method of high damping material while containing quasi-crystalline substance and long-periodic structure phase |
| CN105316550B (en) * | 2015-03-12 | 2019-01-25 | 华东交通大学 | One kind high resistant damping magnesium alloy of phase containing long-periodic structure and preparation method thereof |
| JP6594663B2 (en) * | 2015-05-27 | 2019-10-23 | 本田技研工業株式会社 | Heat-resistant magnesium casting alloy and its manufacturing method |
| CN104894445B (en) * | 2015-06-29 | 2017-04-12 | 西南交通大学 | Production method of ultrahigh-ductility Mg-Zn-Y alloy |
| CN105274412B (en) * | 2015-10-16 | 2017-05-17 | 东北大学 | Mg-Zn-Y directional solidification alloy and preparing method thereof |
| CN105256262B (en) * | 2015-10-29 | 2017-08-11 | 东北大学 | The method that Mg Zn y alloy aging hardening effects are improved by preset twin |
| CN108467962B (en) * | 2018-04-13 | 2019-12-17 | 中北大学 | Preparation method of magnesium-zinc-yttrium quasicrystal and boron carbide mixed enhanced magnesium-based composite material |
| CN109763009A (en) * | 2019-03-07 | 2019-05-17 | 济南大学 | A kind of method of current processing Mg-Zn-Gd quasicrystalline alloy |
| CN109868402B (en) * | 2019-03-29 | 2021-08-17 | 上海交通大学 | High-strength-toughness heat-resistant die-casting Mg-Y alloy and preparation method thereof |
| CN109852857B (en) * | 2019-03-29 | 2021-08-06 | 上海交通大学 | High-strength-toughness heat-resistant Mg-Y alloy suitable for gravity casting and preparation method thereof |
| CN110004343B (en) * | 2019-03-29 | 2021-07-13 | 上海交通大学 | High-strength high-toughness heat-resistant Mg-Gd-Er alloy suitable for gravity casting and preparation method thereof |
| CN111621726A (en) * | 2020-05-22 | 2020-09-04 | 华东交通大学 | Preparation method of high-damping Mg-Zn-Y-based composite material |
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