CN105177474B - A method of improving metal alloy heat conductivility - Google Patents
A method of improving metal alloy heat conductivility Download PDFInfo
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- CN105177474B CN105177474B CN201510540226.5A CN201510540226A CN105177474B CN 105177474 B CN105177474 B CN 105177474B CN 201510540226 A CN201510540226 A CN 201510540226A CN 105177474 B CN105177474 B CN 105177474B
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- artificial aging
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Abstract
The invention discloses a kind of methods improving low-alloy content metal alloy heat conductivility --- and artificial aging is heat-treated, this method is suitable for the multi-element alloyed metal alloy that host element mass percent accounting is more than 85wt.%, such as magnesium alloy, aluminium alloy and titanium alloy, artificial aging heat treatment temperature controls within 100~250 DEG C of ranges, and aging time controlled within the scope of 2~96 hours.The metal alloy obtained according to different processing approach is after ageing treatment, so that alloying element involved by supersaturated solid solution is precipitated in alloy, or so that remaining machining stress is eliminated in alloy, can be such that the Alloy At Room Temperature thermal conductivity is improved, room temperature thermal conductivity can generally be made to improve at least 5%.
Description
Technical field
The present invention relates to a kind of metal material heat treatment methods, and in particular to a kind of side for improving metal alloy heat conductivility
Method belongs to metal material processing preparation field.
Background technology
Heat Conduction Material application is very wide, can be divided into metal thermal conductive material, inorganic non-metallic Heat Conduction Material, You Jigao by material
Molecule Heat Conduction Material.Conventional metals Heat Conduction Material room temperature heat conductivility is good, easily processed into type, is widely used.Inorganic non-gold
It is high (2 type diamonds, room temperature thermal conductivity are up to 2000W/ (mK)) to belong to Heat Conduction Material thermal conductivity, but difficult processing.Organic polymer
What application was most at present is heat conductive silica gel, thermal conductive silicon lipid materials, although easy to process, thermal conductivity is relatively low, using limited
System.
Metal heat-conducting mechanism is mainly contributed by scattering two parts of the scattering of electronics and phonon and phonon and phonon.To metal
The research of transport property (conductive, heat conduction) run through the entire development history of solid-state physics.That reaches an agreement at present is interpreted as, low
In the case of temperature, sommerfeld model adapts to preferably the processing of electronics heat conduction thermal capacitance, and Debye model is suitable to the processing of phonon thermal conduction thermal capacitance；
When high temperature, Drude and dulongpodi models have certain value；And medium temperature model is complex, each model is not
Exact value can be obtained, needs to study in detail.And since the Fermi temperature of metal is generally 105The K orders of magnitude, significantly larger than room temperature.
Therefore it can be generally considered as metal electron at room temperature to be applicable in thermal capacitance being sommerfeld model, you can be approximately considered the electricity of metal at room temperature
Son is the free electron gas moved off field in periodic potential.Therefore electronics can be according to Conductivity Calculation to the contribution of thermal conductivity at room temperature
It obtains.But the Debye temperature and room temperature of metal have same order (generally 102K), therefore metal is at room temperature at phonon thermal capacitance
Reason model needs our further investigateds.Then, metallic room warm conductance raising main path be improve at room temperature phonon to heat
The contribution of conductance.
Under the overall situation of promotion " energy-saving and emission-reduction ", lightweight has very important significance to engineer application.Light-alloy
Since specific strength is high, convenient formation is quite favored in engineering innovation.Its Typical Representative magnesium, aluminium, titanium alloy are because its density is low, power
It is good to learn excellent performance, heat conductivility, is increasingly taken seriously in aerospace, automobile industry, 3C Product industry.And it is engineered
Application environment is higher and higher to the heat dissipation performance demand of magnesium/aluminium/titanium alloy.How it is easy-to-use improve alloy room temperature thermal conductivity
Rate becomes particularly significant.
Invention content
The object of the present invention is to provide a kind of room temperature thermal conductivities easy to operate, low-cost improving magnesium, aluminium, titanium alloy
Method.
Method of the present invention is magnesium, aluminium, titanium alloy product or the semi-finished product or raw material obtained to various preparation approachs
Carry out artificial aging heat treatment.Specific technical solution is as follows：
A method of metal alloy heat conductivility is improved, artificial aging heat treatment, artificial aging are carried out to metal alloy
Heat treatment temperature controls within 100~250 DEG C of ranges, and aging time controlled within the scope of 2~96 hours.
Preferably, metal alloy is the metal alloy of low alloying, and pivot cellulose content is more than 85wt.% in metal alloy.
It is highly preferred that metal alloy is magnesium alloy, aluminium alloy or the titanium alloy that main constituent content is more than 85wt.%.
Preferably, metal alloy is the metal alloy of casting processing.It is highly preferred that metal alloy be by die-casting process or
The metal alloy of deformation process.
Preferably, after artificial aging is heat-treated, the alloy part element being dissolved in metal alloy becomes to analyse metal alloy
Go out and is mutually precipitated.It is highly preferred that artificial aging heat treatment reduces the content of alloying element in supersaturated solid solution in metal alloy, from
And reduce the distortion of lattice caused by alloying element dissolves in metal alloy so that the distortion potential scattering of phonon reduces to carry
High room temperature thermal conductivity.
Preferably, artificial aging heat treatment reduces the machining stress in metal alloy.It is highly preferred that artificial aging is heat-treated
Reduce the distortion of lattice in metal alloy caused by residual stress so that the scattering of phonon and phonon weakens to improve room temperature heat
Conductance.
It is an advantage of the invention that simple and easy to do, applied widely.Being applicable not only to different strengthening mechanisms, (solution strengthening is light
Alloy, ageing strengthening light-alloy etc.) light-alloy, applying also for different processing methods, (various castings include die casting, deformation process
Deng) alloy base material, semi-finished product and finished product.
Specific implementation mode
It is the specific implementation mode of invention below.Example done in embodiment is only used as example, involved in the present invention
Protected object, example is not limited to, including all are by alloying component and aging technique involved in claims.
Case study on implementation 1：Magnesium alloy, table one are room temperature thermal conductivity of the magnesium alloy of different-alloy ingredient before and after aging strengthening model
Rate compares.
Table 1
Case study on implementation 2：Aluminium alloy, table two are room temperature thermal conductivity of the aluminium alloy of different-alloy ingredient before and after aging strengthening model
Rate compares.
Table 2
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of application of artificial aging heat treatment method in improving metal alloy heat conductivility, which is characterized in that metal
Alloy carries out artificial aging heat treatment, and the artificial aging heat treatment temperature control is within the scope of 200~250 DEG C, aging time
Within the scope of 2~24 hours, the metal alloy is the metal alloy of low alloying, the metal alloy of the low alloying for control
It is more than magnesium alloy, aluminium alloy or the titanium alloy of 85wt.%, the metal after the artificial aging heat treatment for main constituent content
For the room temperature thermal conductivity of alloy relative at least promoting 8.7% before processing, the artificial aging heat treatment reduces the metal alloy
The content of alloying element in middle supersaturated solid solution, to reduce the crystalline substance caused by alloying element dissolves in the metal alloy
Lattice distort so that the distortion potential scattering of phonon reduces to improve room temperature thermal conductivity.
2. a kind of artificial aging heat treatment method according to claim 1 answering in improving metal alloy heat conductivility
With, which is characterized in that the metal alloy is the metal alloy of casting processing.
3. a kind of artificial aging heat treatment method according to claim 1 answering in improving metal alloy heat conductivility
With, which is characterized in that the metal alloy is the metal alloy by die-casting process or deformation process.
4. a kind of artificial aging heat treatment method according to claim 1 answering in improving metal alloy heat conductivility
With, which is characterized in that the metal alloy after artificial aging heat treatment, the alloy part that is dissolved in the metal alloy
Element becomes precipitated phase precipitation.
5. a kind of artificial aging heat treatment method according to claim 1 answering in improving metal alloy heat conductivility
With, which is characterized in that the artificial aging heat treatment reduces the machining stress in the metal alloy.
6. a kind of artificial aging heat treatment method according to claim 5 answering in improving metal alloy heat conductivility
With, which is characterized in that the artificial aging heat treatment reduces the distortion of lattice in the metal alloy caused by residual stress.
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| CN105177474B true CN105177474B (en) | 2018-07-13 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08246118A (en) * | 1995-03-03 | 1996-09-24 | Ube Ind Ltd | Production of aluminum alloy casting |
| JP2006016691A (en) * | 2004-06-03 | 2006-01-19 | Nippon Thermotech Kk | Heat treatment method and heat treatment apparatus for solid alloy material |
| JP2007009262A (en) * | 2005-06-29 | 2007-01-18 | Mitsubishi Alum Co Ltd | Aluminum alloy sheet with excellent thermal conductivity, strength and bendability and its manufacturing method |
| JP2008101264A (en) * | 2006-10-20 | 2008-05-01 | Honda Motor Co Ltd | Heat-resistant aluminum-alloy extruded material and heat treatment method therefor |
| CN102409272A (en) * | 2011-11-22 | 2012-04-11 | 中国航空工业集团公司北京航空材料研究院 | Strengthening and toughening aging process for Al-Zn-Mg-Cu-series aluminum alloy |
| CN102766834B (en) * | 2012-08-08 | 2013-10-16 | 镇江忆诺唯记忆合金有限公司 | Preparation method of NiTiVNd memory alloy hot rolling panel |
| CN103981415B (en) * | 2014-05-09 | 2016-06-15 | 曹帅 | A kind of high damping magnesio noiseless alloy and preparation method thereof |
| CN104694858A (en) * | 2015-02-12 | 2015-06-10 | 湖南大学 | Hot working method capable of simultaneously improving electrical conductivity and strength of aluminum alloy |
| CN104651689B (en) * | 2015-02-28 | 2018-10-09 | 重庆大学 | A kind of high heat conductance magnesium alloy and preparation method thereof used under high temperature environment |
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