CN104651641A - Method for optimizing magnesium alloy property by adding La and Sc - Google Patents
Method for optimizing magnesium alloy property by adding La and Sc Download PDFInfo
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- CN104651641A CN104651641A CN201410291095.7A CN201410291095A CN104651641A CN 104651641 A CN104651641 A CN 104651641A CN 201410291095 A CN201410291095 A CN 201410291095A CN 104651641 A CN104651641 A CN 104651641A
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Abstract
The invention discloses a method for optimizing magnesium alloy property by adding La and Sc to distribute beta-Mn17Al12 in Mn-4% Al alloy in a fine disperse form and improve the strength and the plasticity of the alloy. Rare-earth La and Sc elements are added when the cast temperature of the Mn-4% Al alloy is 760 DEG C; the mass fraction of the rare-earth La element is 1%; the mass fraction of the rare-earth Sc element is 1%; the balance is Mn-4% Al alloy; and casting is carried out by a conventional melting mode.
Description
Technical field
The present invention relates to a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy, be specifically related to Mn-4%Al alloy property optimisation technique field.
Background technology
Magnesium alloy especially Mn-4%Al alloy has specific tenacity and specific rigidity is high, heat-conductivity conducting is good, damping vibration attenuation, electromagnetic shielding, be easy to the advantages such as machine-shaping, is described as " 21 century green engineering material ".Magnesium-aluminum series alloy is the magnesium alloy series be most widely used at present, this serial magnesium alloy room temperature texture is mainly α-Mn and β-Mn17Al12 phase, wherein the normal form with divorced eutectic of β phase be net distribution in grain boundaries, corrosion resistance nature and the plasticity of alloy are totally unfavorable.In Mn-Al series magnesium alloy, add a certain amount of rare earth element not only can refinement matrix, makes β-Mn17Al12 with small and dispersed fractions distribution; Also can improve alloy high-temp creep-resistant property, corrosion-resistant and flame retardant properties simultaneously.But the aluminium rare-earth phase generated in alloy graining process distributes along crystal boundary with needle-like or shaft-like form; And can not effectively change its form and distribution by heat treatment such as solid solutions.With the rare-earth phase that acicular morphology exists, produce Mn alloy substrate and very strong isolate effect, when alloy is stressed, easily cause stress concentration, alloy obdurability is very unfavorable.For wrought magnesium alloys, its as-cast structure is comparatively large on subsequent machining technology impact, if can control effectively to its as-cast structure, is then expected to obtain more preferably performance.
Summary of the invention
The technical problem to be solved in the present invention: a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy is provided, β-Mn17Al12 in Mn-4%Al alloy can be made with small and dispersed fractions distribution, put forward heavy alloyed intensity and plasticity, to overcome the deficiencies in the prior art.
Technical scheme of the present invention:
A kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy, rare earth La and Sc element is added when Mn-4%Al alloy casting state temperature is 760 DEG C, described earth La counts 1% with massfraction, described rare earth Sc element counts 1% with massfraction, surplus is Mn-4%Al alloy, adopts conventional smelting mode to smelt.
Described rare-earth elements La adds in the mode of master alloy, and this master alloy is Mn-La alloy.
Described rare earth Sc is added in the mode of master alloy, and this master alloy is Mn-Sc alloy.
Beneficial effect of the present invention:
The present invention, by after adding La and Sc at as cast condition Mn-4%Al alloy, can make alloy substrate weave construction change, create the LaSc cenotype of Dispersed precipitate.According to Orowan mechanism, the equally distributed Second Phase Particles of disperse can hinder the motion of dislocation in plastic history, thus produces significant strengthening effect, and the isolate effect of particle to matrix of Particle Phase is little simultaneously, not easily cause stress concentration at matrix, therefore can improve again the plasticity of alloy.
accompanying drawing illustrates:
Fig. 1 is Mn-4%Al alloy structure figure;
Fig. 2 is the Mn-4%Al alloy structure figure after only adding La;
Fig. 3 adds La and Sc Mn-4%Al alloy structure figure later.
embodiment:
Embodiment:
The present invention's raw material is pure Mn (99.99%), pure Al (99.99%), preparation Mn-4%Al-1%La, Mn-4%Al-1%La-1%Sc series magnesium alloy.In alloy, add La, Sc element with Mn-La, Mn-Sc master alloy form respectively during batching, in blending process, consider the burn out rate of alloying element.Alloy, in resistance furnace, adopts soft steel crucible to carry out melting, adopts CO2, SF6 mixed gas as shielding gas in process.When furnace temperature is raised to 400 DEG C ~ 500 DEG C, add pure magnesium and fine aluminium block, preparation Mn-4%Al alloy, Mn-Sc, Mn-La master alloy is added 760 DEG C time, 15min is left standstill Deng stirring after master alloy fusing, pouring into temperature at 730 DEG C is in the metallic mould of 280 DEG C, casts the coupon of Φ 15mm × 150mm.In order to eliminate the impact of sample position on grain size, all samples are all in coupon same position sampling.Sample, after corase grind, fine grinding and polishing, adopts 4% nital etch, erosion time about 10s.Adopt Olympus H2-UMA type metallographic acquisition system, the as-cast structure of alloy is observed.
As can be known from Fig. 1, Mn-3%Al Alloy At Room Temperature tissue is mainly α-Mn and β-Mn17Al12 phase, and wherein the normal form with divorced eutectic of β phase is that net distribution is in grain boundaries.
As can be seen from Figures 2 and 3, when only adding La, in alloy, do not have netted β-Mn17Al12 to occur mutually, but existed and comparatively small amt with tiny point-like or irregular bulk, occurred more shank shape cenotype in alloy simultaneously; And La, Sc add the ball massive phase having occurred black in fashionable alloy simultaneously, now needlelike phase can not significantly be observed, and β-Mn17Al12 is broken up in point-like or irregular block Dispersed precipitate.
Claims (5)
1. one kind is added the method for rare earth La and Sc optimization Properties of Magnesium Alloy, it is characterized in that: add rare earth La and Sc element when Mn-4%Al alloy casting state temperature is 760 DEG C, described earth La counts 1% with massfraction, described rare earth Sc element counts 1% with massfraction, surplus is Mn-4%Al alloy, adopts conventional smelting mode to smelt.
2. a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy according to claim 1, is characterized in that: described rare-earth elements La adds in the mode of master alloy.
3. a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy according to claim 2, is characterized in that: described master alloy is Mn-La alloy.
4. a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy according to claim 1, is characterized in that: described rare earth Sc is added in the mode of master alloy.
5. a kind of method of adding rare earth La and Sc optimization Properties of Magnesium Alloy according to claim 2, is characterized in that: described master alloy is Mn-Sc alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410291095.7A CN104651641A (en) | 2014-10-08 | 2014-10-08 | Method for optimizing magnesium alloy property by adding La and Sc |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410291095.7A CN104651641A (en) | 2014-10-08 | 2014-10-08 | Method for optimizing magnesium alloy property by adding La and Sc |
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| Publication Number | Publication Date |
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| CN104651641A true CN104651641A (en) | 2015-05-27 |
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| CN201410291095.7A Pending CN104651641A (en) | 2014-10-08 | 2014-10-08 | Method for optimizing magnesium alloy property by adding La and Sc |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| JPH0853722A (en) * | 1994-08-10 | 1996-02-27 | Kobe Steel Ltd | Production of magnesium-base alloy excellent in high temperature creep strength |
| CN102181760A (en) * | 2011-05-10 | 2011-09-14 | 嘉瑞科技（惠州）有限公司 | Magnesium alloy containing multiple trace rare earths |
| CN102618762A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resisting magnesium alloy |
| CN102994836A (en) * | 2011-09-09 | 2013-03-27 | 江汉大学 | Tough magnesium alloy with high elongation rate |
-
2014
- 2014-10-08 CN CN201410291095.7A patent/CN104651641A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| JPH0853722A (en) * | 1994-08-10 | 1996-02-27 | Kobe Steel Ltd | Production of magnesium-base alloy excellent in high temperature creep strength |
| CN102181760A (en) * | 2011-05-10 | 2011-09-14 | 嘉瑞科技（惠州）有限公司 | Magnesium alloy containing multiple trace rare earths |
| CN102994836A (en) * | 2011-09-09 | 2013-03-27 | 江汉大学 | Tough magnesium alloy with high elongation rate |
| CN102618762A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resisting magnesium alloy |
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