JP4341453B2 - Aluminum alloy casting excellent in thermal conductivity and method for producing the same - Google Patents
Aluminum alloy casting excellent in thermal conductivity and method for producing the same Download PDFInfo
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本発明は、一般には熱伝導性に優れたアルミニウム合金鋳物に係り、より詳細には、放熱性を高めるために複雑な形状や薄肉部を有するヒートシンク等に用いて好適なアルミニウム合金鋳物に関する。また、かかるアルミニウム合金鋳物の製造方法にも関する。 The present invention generally relates to an aluminum alloy casting excellent in thermal conductivity, and more particularly to an aluminum alloy casting suitable for use in a heat sink having a complicated shape or a thin portion in order to improve heat dissipation. Moreover, it is related also with the manufacturing method of this aluminum alloy casting.
従来、ヒートシンク等の熱伝導性が求められる部材には、純アルミニウムやアルミニウム合金が用いられている。純アルミニウムの熱伝導性は高いが、鋳造性が低く複雑な形状にすることが困難である。また、強度が低く、複雑な形状になると金型から取り出す際やその他加工や組み立てのために扱っているうちに、割れたり、変形してしまったりする場合がある。そこで、放熱性を高めるために複雑な形状や薄肉部を有するものとする必要があるヒートシンクにあっては、熱伝導性をある程度犠牲にしても高い強度を有し鋳造性に優れるＡｌ−Ｓｉ系等のアルミニウム合金鋳物が特に好適に用いられている。
ところが、近年の電子機器の高性能化に伴い、更に高性能のヒートシンクが求められるようになってきた。そのため、従来のアルミニウム合金鋳物よりも、更に熱伝導性に優れた合金の開発が待たれていた。 However, with the recent high performance of electronic devices, a higher performance heat sink has been demanded. For this reason, development of an alloy having further higher thermal conductivity than that of a conventional aluminum alloy casting has been awaited.
本発明は、上記事情に鑑みてなされたもので、従来のアルミニウム合金鋳物と同等以上の機械的強度及び鋳造性を持ちながら、更に熱伝導性が向上せしめられたアルミニウム合金鋳物を提供することを目的とする。
また本発明は、かかるアルミニウム合金鋳物を製造するための方法を提供することも目的とする。
The present invention has been made in view of the above circumstances, and provides an aluminum alloy casting in which thermal conductivity is further improved while having mechanical strength and castability equivalent to or higher than those of conventional aluminum alloy castings. Objective.
It is another object of the present invention to provide a method for producing such an aluminum alloy casting.
本発明者等は、上記課題を解決するために鋭意研究した結果、Ａｌ−Ｓｉ系アルミニウム合金鋳物の母相中のＳｉ固溶量と金属組織中の晶出物の面積率が、鋳物の熱伝導度と強度に大きく影響し、Ｓｉ固溶量と晶出物の面積率を両方とも最適な値にすると、十分な機械的強度を有しながら熱伝導性に特に優れたアルミニウム合金鋳物が得られることを見出した。
また、Ｓｉ固溶量と晶出物の面積率は、鋳造後の加熱保持処理により、制御することができることが分かった。
As a result of intensive studies to solve the above problems, the present inventors have found that the amount of Si solid solution in the matrix of the Al-Si aluminum alloy casting and the area ratio of the crystallized material in the metal structure are the heat of the casting. If the Si solid solution amount and the crystallized area ratio are both optimized, the aluminum alloy casting having a sufficient mechanical strength and particularly excellent thermal conductivity can be obtained. I found out that
Moreover, it turned out that the amount of Si solid solution and the area ratio of a crystallized substance can be controlled by the heat holding process after casting.
しかして、本発明によれば、Ｓｉ：６.０〜８.０質量％を含み、Ｓｉ及びＡｌ以外の元素が単体で０．６％以下であり、アルミニウム母相中のＳｉ固溶量が０．５〜１．１質量％、好ましくは０．５５〜１．０５質量％、より好ましくは０．６〜１．０質量％に調整され、金属中組織中の晶出物の面積率が５〜８％、好ましくは５．５〜７．５％、より好ましくは６．０〜７．０％に調整されていることを特徴とする、熱伝導性に優れたアルミニウム合金鋳物が提供される。
ここで、上記アルミニウム合金鋳物は、好ましくは、Ｓｉ及びＡｌ以外の元素が、Ｍｇ：０．２〜０．５質量％、Ｆｅ：０．６質量％以下及び合計量が０．２質量％以下のその他の元素からなる組成を有する。
Thus, according to the present invention, Si: 6.0 to 8.0% by mass, elements other than Si and Al alone are 0.6% or less, and the amount of Si solid solution in the aluminum matrix is small. It is adjusted to 0.5 to 1.1% by mass, preferably 0.55 to 1.05% by mass, more preferably 0.6 to 1.0% by mass, and the area ratio of crystallized matter in the metal structure is adjusted. Provided is an aluminum alloy casting excellent in thermal conductivity, characterized by being adjusted to 5 to 8%, preferably 5.5 to 7.5%, more preferably 6.0 to 7.0%. The
Here, in the aluminum alloy casting, preferably, elements other than Si and Al are Mg: 0.2 to 0.5 mass%, Fe: 0.6 mass% or less, and the total amount is 0.2 mass% or less. The composition is composed of other elements.
また、上記アルミニウム合金鋳物は、上記その他の元素中にＴｉ及び／又はＺｒが含まれる場合、Ｔｉ及び／又はＺｒの量が０．０３質量％以下に調整されているのが好ましい。
かかるアルミニウム合金鋳物は、従来のアルミニウム合金鋳物よりも優れた熱伝導度を有するものであり、好ましくは１６０Ｗ／ｍ・ｋ以上、より好ましくは１６５Ｗ／ｍ・ｋ以上の熱伝導度を示す。
Moreover, when the said aluminum alloy casting contains Ti and / or Zr in said other element, it is preferable that the quantity of Ti and / or Zr is adjusted to 0.03 mass% or less.
Such an aluminum alloy casting has a thermal conductivity superior to that of a conventional aluminum alloy casting, and preferably exhibits a thermal conductivity of 160 W / m · k or more, more preferably 165 W / m · k or more.
更に、本発明では、Ｓｉを６．０〜８.０質量％含み、Ｓｉ及びＡｌ以外の元素が単体で０．６質量％以下のアルミニウム合金鋳物素材を、４００〜５１０℃で１時間以上加熱保持処理することを特徴とする、熱伝導性に優れたアルミニウム合金鋳物の製造方法が提供される。
ここで、アルミニウム合金鋳物素材は、好ましくは、Ｓｉ：６．０〜８.０質量％、Ｍｇ：０.２〜０.５質量％、Ｆｅ：０．６質量％以下を含み、残部はアルミニウムと合計量が０．２質量％以下のその他の元素からなり、またアルミニウム合金鋳物素材中のＴｉ及び／又はＺｒが０．０３質量％以下に調整されている。アルミニウム合金鋳物素材の加熱保持処理の時間は１時間以上である。なお、７時間以上加熱保持処理を施しても、それ以上の特性の向上を得ることができないので、７時間以下にすることが好ましい。
Furthermore, in the present invention, an aluminum alloy casting material containing 6.0 to 8.0% by mass of Si and containing only 0.6% by mass of elements other than Si and Al alone is heated at 400 to 510 ° C. for 1 hour or more. There is provided a method for producing an aluminum alloy casting excellent in thermal conductivity, characterized by performing a holding treatment.
Here, the aluminum alloy casting material preferably contains Si: 6.0 to 8.0% by mass, Mg: 0.2 to 0.5% by mass, Fe: 0.6% by mass or less, and the balance is aluminum. And the total amount is 0.2 mass% or less of other elements, and Ti and / or Zr in the aluminum alloy casting material is adjusted to 0.03% by mass or less. The time for the heat holding treatment of the aluminum alloy casting material is 1 hour or more. In addition, since the improvement of the characteristic beyond it cannot be acquired even if it heat-processes for 7 hours or more, it is preferable to make it 7 hours or less.
本発明によれば、機械的強度及び鋳造性を持ちながら、更に熱伝導性が向上せしめられたアルミニウム合金鋳物が得られる。よって、より高性能のヒートシンク等を製造することができる。 According to the present invention, it is possible to obtain an aluminum alloy casting in which thermal conductivity is further improved while having mechanical strength and castability. Therefore, a higher performance heat sink or the like can be manufactured.
本発明の好適な実施形態では、本発明の熱伝導性に優れたアルミニウム合金鋳物は、Ｓｉ：６.０〜８.０質量％を含み、Ｓｉ及びＡｌ以外の元素が単体で０．６％以下であり、アルミニウム母相中のＳｉ固溶量が０．５〜１．１質量％に調整され、金属中組織中の晶出物の面積率が５〜８％に調整されている。
ここで、上記アルミニウム合金鋳物は、好ましくは、Ｓｉ及びＡｌ以外の元素が、Ｍｇ：０．２〜０．５質量％、Ｆｅ：０．６質量％以下及び合計量が０．２質量％以下のその他の元素からなる組成を有する。
In a preferred embodiment of the present invention, the aluminum alloy casting excellent in thermal conductivity of the present invention contains Si: 6.0 to 8.0% by mass, and elements other than Si and Al alone are 0.6%. The amount of Si solid solution in the aluminum matrix is adjusted to 0.5 to 1.1% by mass, and the area ratio of the crystallized substance in the metal structure is adjusted to 5 to 8%.
Here, in the aluminum alloy casting, preferably, elements other than Si and Al are Mg: 0.2 to 0.5 mass%, Fe: 0.6 mass% or less, and the total amount is 0.2 mass% or less. The composition is composed of other elements.
以下に、各組成及び晶出物面積率の作用及び限定理由を説明する。 Below, the effect | action and limitation reason of each composition and a crystallized material area ratio are demonstrated.
（Ｓｉ：６．０〜８．０質量％）
Ｓｉは鋳造性を向上させる作用を有する。ヒートシンクのような複雑な形状や薄肉部を有するものを鋳造する場合、鋳造性を十分なものとするためには、Ｓｉを６．０質量％以上とすることが必要である。このＳｉはＳｉ系晶出物として晶出し、鋳物の機械的強度、耐摩耗性、防振性を向上させる作用も有する。またＳｉ量を更に増大させればさせる程、鋳造性等は向上するが、Ｓｉ量が８．０質量％を超えると熱伝導性が低下してしまう。よって、本発明の目的においては、Ｓｉ量は６．０〜８．０質量％の範囲とされなければならない。
(Si: 6.0-8.0 mass%)
Si has an effect of improving castability. When casting a complicated shape such as a heat sink or a thin part, it is necessary to set Si to 6.0% by mass or more in order to achieve sufficient castability. This Si crystallizes as a Si-based crystallized product, and also has an effect of improving the mechanical strength, wear resistance, and vibration-proof property of the casting. Further, as the Si amount is further increased, the castability and the like are improved, but when the Si amount exceeds 8.0% by mass, the thermal conductivity is lowered. Therefore, for the purposes of the present invention, the Si content must be in the range of 6.0 to 8.0 mass%.
（Ｍｇ：０．２〜０．５質量％）
Ｍｇは、本発明においては必須の元素ではない。しかしながら、Ｍｇは、Ｍｇ系晶出物を形成し、機械的強度を向上させる作用を有するので、機械的強度が特に求められる場合には、含有せしめることが好ましい。この作用は、０．２質量％以上で顕著となり、逆に０．５質量％を超えると熱伝導性が低下する。また、Ｍｇの一部はＭｇ−Ｓｉ系析出物を形成し、機械的強度を向上させる作用を有する。よって、Ｍｇを含有させる場合は、０．２〜０．５質量％の範囲とするのが好ましい。
(Mg: 0.2-0.5% by mass)
Mg is not an essential element in the present invention. However, Mg forms an Mg-based crystallized substance and has an effect of improving mechanical strength. Therefore, when mechanical strength is particularly required, Mg is preferably contained. This effect becomes significant at 0.2% by mass or more, and conversely, when it exceeds 0.5% by mass, the thermal conductivity decreases. Further, part of Mg forms an Mg—Si based precipitate and has an action of improving mechanical strength. Therefore, when it contains Mg, it is preferable to set it as the range of 0.2-0.5 mass%.
（Ｆｅ：０．６質量％以下）
Ｆｅは不可避的に混入する不純物であるが、機械的強度を向上させると共に、ダイカスト法で鋳造する場合には金型の焼き付きを抑制する作用も有する。しかし、Ｆｅの増加に伴って、熱伝導性と伸展性が低下し、Ｆｅの量が０．６質量％を超えると塑性加工性が不十分になる。よって、Ｆｅは不可避的に混入されるとしても、０．３質量％以下とするのが好ましい。
(Fe: 0.6 mass% or less)
Fe is an impurity inevitably mixed in, but improves the mechanical strength and also has the effect of suppressing die seizure when cast by the die casting method. However, as Fe increases, the thermal conductivity and extensibility decrease, and when the amount of Fe exceeds 0.6 mass%, the plastic workability becomes insufficient. Therefore, even if Fe is inevitably mixed, the content is preferably 0.3% by mass or less.
（Ｓｉ、Ａｌ、Ｍｇ及びＦｅ以外のその他の元素の合計量）
本発明によるアルミニウム合金鋳物は、Ｓｉ、Ｍｇ、Ｆｅ、Ａｌ以外の元素も合計で０．２質量％以下であれば、含有していてもよい。これらの元素は、通常は不可避不純物であるが、必ずしもそうと認識されている必要はない。これらの元素としては、具体的には、Ｔｉ、Ｍｎ、Ｃｒ、Ｂ、Ｚｒ、Ｐ、Ｃａ、Ｎａ、Ｓｒ、Ｓｂ及びＺｎ等が挙げられる。
またここで、Ｔｉ、Ｍｎ及びＺｒは熱伝導率に及ぼす影響が大きいので、それらの量は０．０５質量％以下に抑制するのが好ましい。
(Total amount of other elements other than Si, Al, Mg and Fe)
The aluminum alloy casting according to the present invention may contain elements other than Si, Mg, Fe, and Al as long as the total is 0.2% by mass or less. These elements are usually inevitable impurities, but need not be recognized as such. Specific examples of these elements include Ti, Mn, Cr, B, Zr, P, Ca, Na, Sr, Sb, and Zn.
Here, since Ti, Mn, and Zr have a large influence on the thermal conductivity, their amount is preferably suppressed to 0.05% by mass or less.
（Ｓｉ固溶量：０．５〜１．１質量％）（好ましい範囲：０．５５〜１．０５質量％、更に好ましい範囲：０．６〜１．０質量％）
アルミニウム合金鋳物において、Ｓｉ固溶量はその熱伝導性に大きな影響を及ぼし、Ｓｉ固溶量が１．１質量％を超えると、熱伝導性が低下してしまう。一方、Ｓｉ固溶量が０．５質量％未満になると、十分な機械的強度が得られなくなる。
(Si solid solution amount: 0.5 to 1.1% by mass) (preferable range: 0.55 to 1.05% by mass, more preferable range: 0.6 to 1.0% by mass)
In an aluminum alloy casting, the amount of Si solid solution greatly affects its thermal conductivity, and if the amount of Si solid solution exceeds 1.1% by mass, the thermal conductivity decreases. On the other hand, when the Si solid solution amount is less than 0.5% by mass, sufficient mechanical strength cannot be obtained.
（晶出物の面積率：５〜８％）（好ましい範囲：５．５〜７．５％、更に好ましい範囲：６．０〜７．０％）
本発明者等が新たに知見したところであるが、アルミニウム合金鋳物において、晶出物の面積率が８％を超えると、晶出物が熱伝導を阻害してしまう。また、伸びも低くなる。一方、晶出物の面積率が５％未満と少ないと、十分な強度が得られなくなる。
(Area ratio of crystallized product: 5 to 8%) (Preferable range: 5.5 to 7.5%, more preferable range: 6.0 to 7.0%)
As the inventors have newly found out, in an aluminum alloy casting, when the area ratio of the crystallized substance exceeds 8%, the crystallized substance inhibits heat conduction. Also, the elongation is low. On the other hand, when the area ratio of the crystallized product is as small as less than 5%, sufficient strength cannot be obtained.
本発明者等は、上記のアルミニウム合金鋳物は、従来の鋳造性に優れるアルミニウム合金鋳物を更に所定温度に加熱保持処理することによって得られることを見出した。
すなわち、本発明に係る製造方法は、先ず、所定の組成を持つアルミニウム合金鋳物素材を製造する。鋳造法は、溶湯鋳造法、ＤＣ法、金型鋳造法等々、従来から知られている任意の鋳造法を利用することができ、場合によっては、市販のアルミニウム合金鋳物を本発明の方法の素材として利用することもできる。使用するアルミニウム合金鋳物素材は、Ｓｉを６．０〜８.０質量％含み、Ｓｉ及びＡｌ以外の元素が単体で０．６質量％以下のもの、より好ましくは、Ｓｉ：６．０〜８.０質量％、Ｍｇ：０.２〜０.５質量％、Ｆｅ：０．６質量％以下を含み、残部はアルミニウムと合計量が０．２質量％以下のその他の元素からなるものである。このようなアルミニウム合金鋳物としては、例えばＪＩＳ規格ＡＣ４Ｃ及びＡＣ４ＣＨ合金で鋳造した鋳物が挙げられる。
The present inventors have found that the above-described aluminum alloy casting can be obtained by further heat-holding a conventional aluminum alloy casting having excellent castability to a predetermined temperature.
That is, the manufacturing method according to the present invention first manufactures an aluminum alloy casting material having a predetermined composition. As the casting method, any conventionally known casting method such as a molten metal casting method, a DC method, a mold casting method, or the like can be used. In some cases, a commercially available aluminum alloy casting is used as a material of the method of the present invention. It can also be used as The aluminum alloy casting material to be used contains 6.0 to 8.0% by mass of Si, and elements other than Si and Al alone are 0.6% by mass or less, more preferably Si: 6.0 to 8 0.0% by mass, Mg: 0.2 to 0.5% by mass, Fe: 0.6% by mass or less, with the balance being aluminum and other elements with a total amount of 0.2% by mass or less . Examples of such aluminum alloy castings include castings cast from JIS standard AC4C and AC4CH alloys.
ついで、上記アルミニウム合金鋳物素材を、４００〜５１０℃に加熱保持処理する。このような加熱保持処理によって、母相中に固溶されていたＳｉが析出し、母相中のＳｉ固溶量が０．５〜１．１質量％の範囲になると共に、晶出物の一部が母相中に固溶し、晶出物の面積率が５〜８％の範囲になる。 Next, the aluminum alloy casting material is heated and held at 400 to 510 ° C. By such heating and holding treatment, Si dissolved in the matrix phase is precipitated, and the amount of Si solution in the matrix phase is in the range of 0.5 to 1.1% by mass. A part is dissolved in the matrix, and the area ratio of the crystallized product is in the range of 5 to 8%.
ここで、加熱保持温度は、５１０℃を超えると、晶出物が母相中に固溶するものが多くなり、その結果、晶出物の面積率が低下するとともにＳｉ固溶量が多くなり、熱伝導性が低下する。また、機械的強度も低下する。逆に、加熱保持温度が４００℃以下の場合、母相中のＳｉが析出せず、Ｓｉ固溶量が減少しないので熱伝導性が向上しない。また、晶出物の一部が母相中に固溶しないので、晶出物の面積率が大きくなり、熱伝導性が低下する。
また、加熱保持処理は、好ましくは１時間以上行うことが好ましい。また５時間を超えて加熱保持しても、Ｓｉ固溶量および晶出物の面積率はそれ以上はほとんど変化しない。よって、コスト面から保持時間は５時間未満とすることが好ましい。
Here, when the heating and holding temperature exceeds 510 ° C., the crystallized product is often dissolved in the matrix, and as a result, the area ratio of the crystallized product decreases and the amount of Si solid solution increases. , Thermal conductivity decreases. Also, the mechanical strength is reduced. On the contrary, when the heating and holding temperature is 400 ° C. or lower, Si in the matrix phase does not precipitate and the amount of Si solid solution does not decrease, so the thermal conductivity is not improved. In addition, since a part of the crystallized product does not dissolve in the matrix, the area ratio of the crystallized product increases and the thermal conductivity decreases.
The heat holding treatment is preferably performed for 1 hour or longer. Moreover, even if it heat-maintains over 5 hours, the amount of Si solid solution and the area ratio of a crystallized substance will hardly change beyond it. Therefore, the holding time is preferably less than 5 hours from the viewpoint of cost.
加熱保持後は、常温まで冷却するが、その後の冷却は、水冷で冷却しても、炉冷で徐冷してもよい。冷却速度によって析出物の量が異なり、Ｓｉの固溶量も変化するが、本発明合金の場合には、加熱保持処理の際にＳｉが既に析出し、Ｓｉ固溶量が少なくなっているので、その影響は小さい。強度を少しでも高くしたい場合は、水冷が好ましい。しかし、水冷の場合、部分部分によって冷却速度が異なり、冷却時に変形が生じやすいので、ヒートシンクのような薄肉部を有するものの場合は徐冷が好ましい。 After heating and holding, it is cooled to room temperature, but the subsequent cooling may be water cooling or slow cooling with furnace cooling. The amount of precipitate varies depending on the cooling rate, and the solid solution amount of Si also changes. However, in the case of the alloy of the present invention, Si is already precipitated during the heat holding treatment, and the Si solid solution amount is reduced. The effect is small. Water cooling is preferred when it is desired to increase the strength as much as possible. However, in the case of water cooling, the cooling rate differs depending on the portion, and deformation is likely to occur during cooling. Therefore, slow cooling is preferable in the case of a thin part such as a heat sink.
以下、本発明を、実施例によって更に詳細に説明する。
（実施例１）
Ｓｉを７．１質量％、Ｍｇを０．３２質量％、Ｆｅを０．２質量％とアルミニウムからなり、その他の元素の合計量が０．２質量％以下であるアルミニウム合金鋳物素材（ＪＩＳ規格ＡＣ４Ｃに相当）を、ＤＣ鋳造法により２０３φx２０００ｍｍに鋳造した。得られたアズキャスト材（Ｎｏ．１）を、３８０℃、４２０℃、４５０℃、５００℃、５３５℃、５５０℃で５時間保持し、その後、水冷によって常温まで冷却し、アルミニウム合金鋳物（Ｎｏ．２〜７）を得た。
Hereinafter, the present invention will be described in more detail by way of examples.
(Example 1)
Aluminum alloy casting material (JIS standard) consisting of 7.1 mass% Si, 0.32 mass% Mg, 0.2 mass% Fe and aluminum, and the total amount of other elements being 0.2 mass% or less (Corresponding to AC4C) was cast to 203φ × 2000 mm by the DC casting method. The obtained as-cast material (No. 1) was held at 380 ° C., 420 ° C., 450 ° C., 500 ° C., 535 ° C., 550 ° C. for 5 hours, then cooled to room temperature by water cooling, and an aluminum alloy casting (No. .2-7) were obtained.
アズキャスト材（Ｎｏ．１）及び上記のようにして加熱保持処理を施して得られたアルミニウム合金鋳物（Ｎｏ．４〜６）について顕微鏡による組織観察を行った。その結果の一部を図１に示す。 The as-cast material (No. 1) and the aluminum alloy castings (No. 4 to 6) obtained by performing the heating and holding treatment as described above were observed with a microscope. A part of the result is shown in FIG.
更に、上記アズキャスト材及びアルミニウム合金鋳物について、それぞれ、熱伝導度、引張強度、Ｓｉ固溶量及び晶出物の面積率を測定した。
ここで、Ｓｉ固溶量については、合金中のＳｉ量と熱フェノール残渣中のＳｉ量を化学分析によって求め、得られた合金中のＳｉ量から、フェノール残渣中のＳｉ量を差し引いたものをＳｉ固溶量とした。なお、熱フェノール溶解残渣は、合金を熱フェノールで溶解したものをメンブランフィルター（０．１μｍ）で、濾過して回収した。
また、晶出物の面積率については、鉱物を鏡面研磨した後、画像処理・解析装置にセットし、測定した。測定は、１視野（０．０１４ｍｍ２）を１０視野測定し、その平均値をとった。
Furthermore, about the said as-cast material and aluminum alloy casting, the thermal conductivity, the tensile strength, the amount of Si solid solution, and the area ratio of the crystallized substance were measured, respectively.
Here, about the amount of Si solid solution, the amount of Si in the alloy and the amount of Si in the hot phenol residue were obtained by chemical analysis, and the amount of Si in the obtained alloy was subtracted from the amount of Si in the phenol residue. It was set as the amount of Si solid solution. The hot phenol dissolution residue was recovered by filtering an alloy dissolved with hot phenol through a membrane filter (0.1 μm).
Further, the area ratio of the crystallized material was measured after mirror-polishing the mineral and setting it in an image processing / analyzing apparatus. In the measurement, 10 visual fields (0.014 mm 2 ) were measured, and the average value was taken.
以上の測定の結果を表１にまとめる。
この表１の結果から分かるように、加熱保持処理を施していないアズキャスト材（Ｎｏ．１）及び加熱保持処理温度の低い比較アルミニウム合金鋳物（Ｎｏ．２）は、晶出物の面積率が大きく、そのため熱伝導度及び伸びが低くなっている。このことから、晶出物が熱伝導を阻害していることが確認される。
また、加熱保持処理温度が高い比較アルミニウム合金鋳物（Ｎｏ６〜７）は、Ｓｉ固溶量が増加し、熱伝導度が低くなっていることが分かる。
これに対して、本発明に係るアルミニウム合金鋳物（Ｎｏ３〜５）は、何れもＳｉ固溶量と晶出物の面積が、最適な範囲となっており、熱伝導度、引張強度及び伸びが全て高い数値となっていることが分かる。
As can be seen from the results in Table 1, the as-cast material (No. 1) not subjected to the heat holding treatment and the comparative aluminum alloy casting (No. 2) having a low heat holding treatment temperature have a crystallized area ratio. Large, and therefore have low thermal conductivity and elongation. From this, it is confirmed that the crystallized substance inhibits heat conduction.
Moreover, it turns out that the comparative aluminum alloy casting (No. 6-7) with high heat retention processing temperature has increased the amount of Si solid solution, and has low thermal conductivity.
On the other hand, in the aluminum alloy castings (Nos. 3 to 5) according to the present invention, the Si solid solution amount and the area of the crystallized material are in the optimum ranges, and the thermal conductivity, tensile strength, and elongation are high. It turns out that all are high numbers.
（実施例２）
実施例１で得られたアズキャスト材を、４５０℃で０．５時間、１時間、３時間及び７時間のそれぞれの保持時間で加熱保持処理を施し、その後常温まで徐冷し、アルミニウム合金鋳物（Ｎｏ．８〜１１）を得た。得られたアルミニウム合金鋳物について、実施例１と同じ方法でＳｉ固溶量、晶出物の面積率、熱伝導度、引張強度及び伸びを測定した。
(Example 2)
The as-cast material obtained in Example 1 was heated and held at 450 ° C. for 0.5 hours, 1 hour, 3 hours and 7 hours, and then slowly cooled to room temperature, and then casted aluminum alloy. (Nos. 8 to 11) were obtained. About the obtained aluminum alloy casting, the amount of Si solid solution, the area ratio of the crystallized product, the thermal conductivity, the tensile strength and the elongation were measured by the same method as in Example 1.
その結果を表２に示す。
表２の結果から分かるように、加熱保持処理時間が０．５時間の場合、晶出物が十分に固溶せず、その結果、熱伝導度や引張強度及び伸びが低くなっていることが分かる。 As can be seen from the results in Table 2, when the heat retention treatment time is 0.5 hours, the crystallized product does not sufficiently dissolve, and as a result, the thermal conductivity, tensile strength, and elongation are low. I understand.
Claims (4)
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| JP2004111496A JP4341453B2 (en) | 2004-04-05 | 2004-04-05 | Aluminum alloy casting excellent in thermal conductivity and method for producing the same |
| US11/547,257 US20110132504A1 (en) | 2004-04-05 | 2005-04-05 | Aluminum Alloy Casting Material for Heat Treatment Excelling in Heat Conduction and Process for Producing the Same |
| PCT/JP2005/006639 WO2005098065A1 (en) | 2004-04-05 | 2005-04-05 | Aluminum alloy casting material for heat treatment excelling in heat conduction and process for producing the same |
| KR1020067019220A KR20060130658A (en) | 2004-04-05 | 2005-04-05 | Aluminum alloy casting material for heat treatment excelling in heat conduction and process for producing the same |
| EP10182491A EP2275584B1 (en) | 2004-04-05 | 2005-04-05 | Manufacturing method for cast aluminium heat sinks |
| EP05728404.4A EP1736561B1 (en) | 2004-04-05 | 2005-04-05 | Aluminum alloy casting material for heat treatment excelling in heat conduction and process for producing the same |
| EP10182479A EP2281909B1 (en) | 2004-04-05 | 2005-04-05 | Manufacturing method of an aluminium alloy cast heat sink having a complex structure or a thin walled protion with excellent thermal conductivity |
| US13/342,625 US8936688B2 (en) | 2004-04-05 | 2012-01-03 | Aluminum alloy casting material for heat treatment excelling in heat conduction and process for producing the same |
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| JP6140605B2 (en) * | 2013-12-26 | 2017-05-31 | 本田技研工業株式会社 | Al alloy casting and manufacturing method thereof |
| WO2017135463A1 (en) * | 2016-02-05 | 2017-08-10 | 学校法人芝浦工業大学 | Aluminum alloy for casting, aluminum alloy member and method for producing aluminum alloy member |
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| CN107532268B (en) * | 2015-04-28 | 2019-12-03 | 联合工程公司 | System and method for being heat-treated to aluminium alloy castings |
| US11408062B2 (en) | 2015-04-28 | 2022-08-09 | Consolidated Engineering Company, Inc. | System and method for heat treating aluminum alloy castings |
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