CN105525176A - Preparation and treatment process of Mg-Gd-Y-Zr alloy - Google Patents
Preparation and treatment process of Mg-Gd-Y-Zr alloy Download PDFInfo
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- CN105525176A CN105525176A CN201410519516.7A CN201410519516A CN105525176A CN 105525176 A CN105525176 A CN 105525176A CN 201410519516 A CN201410519516 A CN 201410519516A CN 105525176 A CN105525176 A CN 105525176A
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Abstract
The invention discloses preparation of an Mg-Gd-Y-Zr alloy. The preparation is characterized in that an ingot metallurgy method is adopted to prepare an Mg-12Gd-3Y-0.6Zr alloy in percentage by mass: industrial pure magnesium, 30.47% of Gd magnesium gadolinium intermediate alloy, 31.72% of Y magnesium yttrium intermediate alloy and 30.16% of Zr magnesium zirconium intermediate alloy are molten at 730-750 DEG C, are protected by using CO2+SF6 mixed gas, are poured, and are uniformly annealed for 24 h at 530 DEG C. The annealed Mg-Gd-Y-Zr alloy is extruded at 450 DEG C; the extrusion rate is 16: 1; and the T5 aging treatment is performed for the extruded alloy.
Description
Technical field
The present invention relates to a kind of preparation and treatment process thereof of Mg-Gd-Y-Zr alloy.
Background technology
Magnesium alloy is structural metallic materials the lightest in current engineer applied, has the advantage such as high specific tenacity and specific rigidity, good machinability and easy recovery, has broad application prospects in fields such as automobile, electronics, aerospace.Mg-Gd-Y-Zr system alloy, because its high-strength temperature-resistant performance, more and more receives the concern of people.At present, the research being alloy for this mainly comprises the following aspects: the impact of alloying, as the impact of the alloys such as the ratio of adjustment Gd, Y atom and the composition of Zn; The impact of machining deformation, as high performance deforming alloy is prepared in extruding, rolling; Heat treated impact, as determined the process etc. that best solid solution system, supersaturated solid solution decompose.But about thermal treatment is reported less on the research that this is alloy property impact, and mostly for cast alloy.Mg-Gd-Y-Zr system alloy is that typical thermal treatment can reinforced magnesium alloy, and the structure and properties of thermal treatment process on this alloy has obvious impact.
Summary of the invention
The technical problem to be solved in the present invention is: the preparation and the treatment process thereof that provide a kind of Mg-Gd-Y-Zr alloy, solve the deficiencies in the prior art.
Technical scheme of the present invention is: a kind of preparation of Mg-Gd-Y-Zr alloy; ingot metallurgy legal system is adopted to be Mg-12Gd-3Y-0.6Zr alloy for massfraction: pure magnesium, 30.47%Gd magnesium gadolinium master alloy, 31.72%Y magnesium yttrium master alloy and 30.16%Zr Mg-Zr intermediate alloy; 730 ~ 750 DEG C of fusings; adopt CO2+SF6 mixed gas protected; cast, after 530 DEG C of homogenizing annealing 24h and get final product.
A treatment process for Mg-Gd-Y-Zr alloy, the Mg-Gd-Y-Zr alloy after annealing extrudes at 450 DEG C, and extrusion ratio is 16:1, the alloy aging T5 process after extruding.
Beneficial effect of the present invention: the mechanical property such as hardness and the intensity change under different heat treatment state of (1) As-extruded Mg-12Gd-3Y-0.6Zr alloy is obvious.
(2) after T5 thermal treatment its yield strength and tensile strength reach 372 respectively, 403MPa, also keep certain plasticity, comprehensive mechanical property is better.Although the ageing strengthening effect of T6 state is better than T5 state alloy, grain growth seriously reduces the mechanical property of alloy, causes the heat treated intensity of T6 and plasticity ratio T5 state to decline all to some extent.Therefore in actual process is produced, to Mg-12Gd-3Y-0.6Zr As-extruded alloy, T5 heat treating method should be adopted.
Embodiment
Adopt ingot metallurgy legal system for Mg-12Gd-3Y-0.6Zr (massfraction, lower same) alloy.Experiment material is pure magnesium, magnesium gadolinium (30.47%Gd) master alloy, magnesium yttrium (31.72%Y) master alloy and magnesium zirconium (30.16%Zr) master alloy.730 ~ 750 DEG C of fusings, adopt CO2+SF6 mixed gas protected.Pour into the billet of accurate 180mm, after 530 DEG C of homogenizing annealing 24h, extrude at 450 DEG C, extrusion ratio is 16: 1.Alloy bar material after extruding carries out solid solution (T4), timeliness (T5) and solid solution+timeliness (T6) three kinds of thermal treatments, and the determination reference magnesium alloy phasor of heat treating regime, specifically in table 1.The warm water cooling of 70 ~ 80 DEG C is adopted during solution treatment.Adopt HVS-1000 type digital display microhardness tester to measure the hardness of alloy sample under various state, load 4.9N, load 15s, each sample hardness test value is 7, then averages.Technic metal tensile mechanical properties is tested in CSS-44100 universal electrical experimental machine, and tension specimen is processed according to GB/T228-2002 regulation, rate of extension 2mm/min.
The hardness value of Mg-12Gd-3Y-0.6Zr alloy under various as-heat-treated condition is as shown in table 2.Can find out, after T4 process, hardness ratio As-extruded decreases.This is that alloy is at high temperature incubated due to when solution treatment, solid solution in alloying element Gd, Y-direction magnesium matrix, except producing certain solution strengthening effect, is also equivalent to alloy and at high temperature anneals; Simultaneously because magnesium belongs to Patterns for Close-Packed Hexagonal Crystal structure, the rate of diffusion of alloying element in magnesium matrix is less.Above two kinds of factors cause solution strengthening effect much smaller than annealing softening effect, and hardness value is obviously reduced.After T5 process, alloy rigidity value increases, than the equal height of As-extruded and T4 process.This is because As-extruded direct aging, not only extrusion effect can keep, and the dislocation produced in extrusion process, subgrain boundary etc. can also promote second-phase dispersion to separate out, thus puies forward heavy alloyed hardness.In order to obtain the Alloy solid solution of abundant solid solution, alloy must be made at high temperature to be incubated the long period, just second-phase can be made so to be fully dissolved in matrix form sosoloid, in follow-up ag(e)ing process, produce more degradation production to strengthen alloy.After carrying out T6 process to As-extruded alloy, hardness is the highest.This is because when the long-time high-temperature residence of solution treatment, the substructure being conducive to Second Phase Precipitation produced in extrusion process disappears, and therefore T6 thermal treatment needs raise aging temp further or extend aging time, could promote the precipitation of second-phase.During solution treatment, second-phase is fully dissolved in matrix, and after quenching, the degree of supersaturation of sosoloid increases, and can produce more degradation production in follow-up ag(e)ing process, thus improves the effect of ageing strengthening, and therefore the hardness value of T6 state is higher than T5 state.
As can be seen from hardness ratio during the 2-in-1 golden thermal treatment of table comparatively, the impact of the mechanical property heat-treated of Mg-12Gd-3Y-0.6Zr alloy clearly.The tensile mechanical properties of alloy under different heat treatment state is in table 3.Can find out, alloy is after T4 process, and intensity and elongation all obviously reduce; Intensity after T5 process is the highest, and yield strength and tensile strength reach 373MPa and 403MPa respectively, and plasticity declines to some extent; After T6 process, intensity a little more than T4 state alloy, but is starkly lower than As-extruded and T5 state alloy, and plasticity is the poorest.T4 state is consistent with the Changing Pattern of hardness value with the Changing Pattern of T5 state intensity, but contrary with T6 state.
(1) mechanical property such as hardness and the intensity change under different heat treatment state of As-extruded Mg-12Gd-3Y-0.6Zr alloy is obvious.
(2) after T5 thermal treatment its yield strength and tensile strength reach 372 respectively, 403MPa, also keep certain plasticity, comprehensive mechanical property is better.Although the ageing strengthening effect of T6 state is better than T5 state alloy, grain growth seriously reduces the mechanical property of alloy, causes the heat treated intensity of T6 and plasticity ratio T5 state to decline all to some extent.Therefore in actual process is produced, to Mg-12Gd-3Y-0.6Zr As-extruded alloy, T5 heat treating method should be adopted.
Claims (2)
1. the preparation of a Mg-Gd-Y-Zr alloy; it is characterized in that: adopt ingot metallurgy legal system to be Mg-12Gd-3Y-0.6Zr alloy for massfraction: pure magnesium, 30.47%Gd magnesium gadolinium master alloy, 31.72%Y magnesium yttrium master alloy and 30.16%Zr Mg-Zr intermediate alloy; 730 ~ 750 DEG C of fusings; adopt CO2+SF6 mixed gas protected; cast, after 530 DEG C of homogenizing annealing 24h and get final product.
2. the treatment process of a kind of Mg-Gd-Y-Zr alloy as claimed in claim 1, is characterized in that: the Mg-Gd-Y-Zr alloy after annealing extrudes at 450 DEG C, and extrusion ratio is 16:1, the alloy aging T5 process after extruding.
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| CN201410519516.7A CN105525176A (en) | 2014-09-30 | 2014-09-30 | Preparation and treatment process of Mg-Gd-Y-Zr alloy |
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| CN201410519516.7A CN105525176A (en) | 2014-09-30 | 2014-09-30 | Preparation and treatment process of Mg-Gd-Y-Zr alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636825A (en) * | 2016-11-21 | 2017-05-10 | 孝义市东义镁业有限公司 | High-strength rare-earth magnesium alloy and preparation method thereof |
| CN106756370A (en) * | 2016-12-10 | 2017-05-31 | 哈尔滨工业大学 | A kind of anti-flaming Mg Gd Y Zn Zr alloys of high-strength anticorrosion and preparation method thereof |
| CN109594028A (en) * | 2019-01-18 | 2019-04-09 | 北京工业大学 | A kind of deformation heat treatment method of high-performance deformation magnesium-rare earth toughening |
-
2014
- 2014-09-30 CN CN201410519516.7A patent/CN105525176A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636825A (en) * | 2016-11-21 | 2017-05-10 | 孝义市东义镁业有限公司 | High-strength rare-earth magnesium alloy and preparation method thereof |
| CN106636825B (en) * | 2016-11-21 | 2018-07-10 | 孝义市东义镁业有限公司 | A kind of high-strength rare earth magnesium alloy material and preparation method thereof |
| CN106756370A (en) * | 2016-12-10 | 2017-05-31 | 哈尔滨工业大学 | A kind of anti-flaming Mg Gd Y Zn Zr alloys of high-strength anticorrosion and preparation method thereof |
| CN109594028A (en) * | 2019-01-18 | 2019-04-09 | 北京工业大学 | A kind of deformation heat treatment method of high-performance deformation magnesium-rare earth toughening |
| CN109594028B (en) * | 2019-01-18 | 2020-10-16 | 北京工业大学 | Thermomechanical treatment method for toughening high-performance wrought rare earth magnesium alloy |
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Application publication date: 20160427 |