JPH0718364A - Heat resistant magnesium alloy - Google Patents
Heat resistant magnesium alloyInfo
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- JPH0718364A JPH0718364A JP18913493A JP18913493A JPH0718364A JP H0718364 A JPH0718364 A JP H0718364A JP 18913493 A JP18913493 A JP 18913493A JP 18913493 A JP18913493 A JP 18913493A JP H0718364 A JPH0718364 A JP H0718364A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、クリープ特性に優れた
鋳造用マグネシウム合金に関し、さらに詳しくは、熱処
理なしでも使用に耐える、成分として亜鉛（Ｚｎ）とカ
ルシウム（Ｃａ）を含有する耐熱マグネシウム合金に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesium alloy for casting having excellent creep properties, and more specifically, a heat-resistant magnesium alloy containing zinc (Zn) and calcium (Ca) as components, which can be used without heat treatment. It is about.
【０００２】[0002]
【従来の技術】近年、材料の軽量化へのニーズが高ま
り、実用合金中最も密度の小さいマグネシウム合金が注
目されている。しかしながら、このマグネシウム合金
は、一般に高温（１００℃以上）下でのクリープ特性が
よくないという問題を有している。2. Description of the Related Art In recent years, there has been an increasing need for reducing the weight of materials, and magnesium alloys having the lowest density among practical alloys have been receiving attention. However, this magnesium alloy generally has a problem that the creep characteristics at high temperatures (100 ° C. or higher) are not good.
【０００３】そこで、この問題を解決するため、重量％
で、カルシウム：0.２〜４％、アルミニウム：１〜６
％、珪素：0.５〜１.5％、マンガン：0.１５〜0.５％、
亜鉛：0.３％以下、銅：0.０６％以下、ニッケル：0.０
３％以下、その他不純物0.３％以下、残りマグネシウム
である「ダイカスト用マグネシウム基合金」（特開昭61
−3863号公報）が提案されている。この合金は、高いク
リープ抵抗を有するとしている。Therefore, in order to solve this problem, weight%
And calcium: 0.2-4%, aluminum: 1-6
%, Silicon: 0.5 to 1.5%, manganese: 0.15 to 0.5%,
Zinc: 0.3% or less, Copper: 0.06% or less, Nickel: 0.0
3% or less, 0.3% or less of other impurities, and the balance magnesium "a magnesium-based alloy for die casting" (JP-A-61)
No. 3863) has been proposed. This alloy is said to have high creep resistance.
【０００４】また、従来の他の改良技術として、アルミ
ニウム：２〜１１％、亜鉛：０〜１２％、マンガン：０
〜0.６％、カルシウム：０〜７％の範囲内にあり（但
し、少なくともＺｎ及び／又はＣａが存在し）、主要部
の不純物の含有量が、ケイ素：0.１〜0.６％、銅＜0.２
％、鉄＜0.１％、ニッケル＜0.０１％の範囲内にあり、
及び残りはマグネシウムである「機械抵抗の高いマグネ
シウム合金及び該合金の急速凝固による製造方法」（特
表平２−503331号公報）が提案されている。これより、
耐蝕性が改善され、かつ高い機械的特性を有するマグネ
シウム合金を製造することができるとしている。Further, as other conventional improvement techniques, aluminum: 2 to 11%, zinc: 0 to 12%, manganese: 0
-0.6%, calcium: 0-7% (however, at least Zn and / or Ca are present), and the main content of impurities is silicon: 0.1-0.6% , Copper <0.2
%, Iron <0.1%, nickel <0.01%,
And the balance is magnesium "a magnesium alloy having high mechanical resistance and a production method by rapid solidification of the alloy" (Japanese Patent Publication No. 2-503331). Than this,
It is said that it is possible to produce a magnesium alloy having improved corrosion resistance and high mechanical properties.
【０００５】また、従来の他の改良技術として、アルミ
ニウム：２〜１１％、亜鉛：０〜１２％、マンガン：０
〜１％、カルシウム：0.５〜７％、希土類元素(RE)：0.
１〜４％の範囲内にあり、主要部の不純物の含有量が、
ケイ素＜0.６％、銅＜0.２％、鉄＜0.１％、ニッケル＜
0.０１％の範囲内にあり、及び残りはマグネシウムであ
る「機械的強度の高いマグネシウム合金及び該合金の急
速凝固による製造方法」（特開平３− 90530号公報）が
提案されている。これより、耐蝕性が改善され、かつ高
い引抜き温度で機械的特性の改善された合金を製造する
ことができるとしている。As other conventional techniques, aluminum: 2 to 11%, zinc: 0 to 12%, manganese: 0
~ 1%, calcium: 0.5-7%, rare earth element (RE): 0.
Within the range of 1 to 4%, the content of impurities in the main part is
Silicon <0.6%, Copper <0.2%, Iron <0.1%, Nickel <
There is proposed a "magnesium alloy having high mechanical strength and a method for producing the alloy by rapid solidification" (Japanese Unexamined Patent Publication No. 3-90530) in which the content is within the range of 0.01% and the balance is magnesium. From this, it is said that an alloy having improved corrosion resistance and improved mechanical properties can be produced at a high drawing temperature.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、特開昭
61−3863号に記載のダイカスト用マグネシウム基合金
は、既存の耐熱用合金であるＭｇ−Ａｌ−Ｓｉ合金を改
良したもので、クリープ特性はそれほど良くはないとい
う問題を有している。これは、静的機械強度を向上させ
るために添加しているＡｌがクリープ特性を悪化させて
しまうためと考えられる。SUMMARY OF THE INVENTION
The magnesium-based alloy for die casting described in 61-3863 is an improvement of the existing heat-resistant alloy Mg-Al-Si alloy, and has a problem that the creep characteristics are not so good. It is considered that this is because Al added to improve the static mechanical strength deteriorates the creep characteristics.
【０００７】また、特表平２−503331号および特開平３
− 90530号に記載のマグネシウム合金は、機械的性質を
向上されるためにＡｌ，ＺｎというＭｇの強化に有効な
元素を多量に含有させている。しかし、これらの元素を
強制的に固溶させても熱的に不安定な組織となり、クリ
ープ特性は悪い。また、この合金組成は、引張強さ、耐
力を重視してＡｌ含有量を２％以上としており、このた
めクリープ特性は悪化するという欠点を有している。Further, Japanese Patent Publication No. 2-503331 and Japanese Unexamined Patent Publication No.
The magnesium alloy described in Japanese Patent No. 90530 contains a large amount of Al and Zn, which are elements effective for strengthening Mg, in order to improve mechanical properties. However, even if these elements are forced to form a solid solution, the structure becomes thermally unstable and the creep characteristics are poor. Further, this alloy composition has a drawback that the Al content is set to 2% or more with an emphasis on tensile strength and proof stress, and therefore the creep characteristics are deteriorated.
【０００８】そこで、本発明者らは、上述の如き従来技
術の問題点を解決すべく鋭意研究し、各種の系統的実験
を重ねた結果、本発明を成すに至ったものである。Therefore, the inventors of the present invention have earnestly studied to solve the above-mentioned problems of the prior art, and as a result of various systematic experiments, the present invention has been accomplished.
【０００９】（発明の目的）本発明の目的は、熱処理を
しない鋳造のままでクリープ特性に優れた耐熱マグネシ
ウム合金を提供するにある。(Object of the Invention) An object of the present invention is to provide a heat-resistant magnesium alloy excellent in creep characteristics as it is cast without heat treatment.
【００１０】本発明者らは、上述の従来技術の問題に対
して、以下のことに着眼した。すなわち、まず、マグネ
シウム合金のクリープ特性の挙動について検討した。そ
の結果、クリープ特性を改善するためには、二次クリー
プ速度が小さいことが不可欠であることに着眼し、この
二次クリープ速度を小さくする添加成分として、Ｚｎが
顕著な効果があることを見いだした。そして、従来のダ
イカスト合金に多く含有され、過多に含有させるとマグ
ネシウム合金のクリープ特性を悪化させるＡｌを第一添
加元素とせずに、Ｚｎを第一添加元素とすることによ
り、クリープ特性に優れたマグネシウム合金を開発する
に至った。The present inventors have focused on the following points with respect to the above-mentioned problems of the prior art. That is, first, the behavior of the creep characteristics of the magnesium alloy was examined. As a result, we focused on the fact that a low secondary creep rate is indispensable for improving the creep characteristics, and found that Zn has a remarkable effect as an additive component that reduces the secondary creep rate. It was The conventional die-casting alloy contains a large amount of Al, and when it is contained in an excessive amount, the creep property is excellent by using Zn as the first additive element instead of Al as the first additive element which deteriorates the creep property of the magnesium alloy. We have developed a magnesium alloy.
【００１１】ところで、従来よりＺｎを第一添加元素と
する砂型鋳造用合金が知られている(ZE41A等、ASTMB93
）が、これらの合金は、複雑な溶解を行い、鋳造した
鋳物には熱処理を施すことが前提となっている。しかし
ながら、この従来のＭｇ−Ｚｎ合金の鋳放し材のクリー
プ特性を調査したところ、クリープ特性は良好ではなか
った。By the way, conventionally, a sand casting alloy containing Zn as a first additive element is known (ZE41A, etc., ASTM B93).
), These alloys undergo complicated melting, and it is premised that the cast product is heat-treated. However, when the creep characteristics of this conventional as-cast Mg—Zn alloy were investigated, the creep characteristics were not good.
【００１２】そこで、本発明者らは、Ｍｇ−Ｚｎ合金に
対して、クリープ特性の改善に有効であるとともに、鋳
放しのままでも良好なクリープ特性を発現できる合金用
添加元素としてＣａに着目し、熱処理をしない鋳造のま
までクリープ特性に優れた耐熱マグネシウム合金得るに
至った。Therefore, the present inventors have focused on Ca as an additive element for alloys, which is effective for improving the creep characteristics of Mg-Zn alloys and which can exhibit good creep characteristics even in the as-cast state. As a result, it has been possible to obtain a heat-resistant magnesium alloy with excellent creep characteristics as it is cast without heat treatment.
【００１３】[0013]
（第１発明の構成）本発明の耐熱マグネシウム合金は、
重量％でＺｎ：１.0〜６.0％、Ｃａ：0.５〜５.0％を含
み、残部がマグネシウムと不可避物質とからなり、優れ
たクリープ特性を有することを特徴とする。(Structure of First Invention) The heat-resistant magnesium alloy of the present invention is
It is characterized by including Zn: 1.0 to 6.0% and Ca: 0.5 to 5.0% by weight, the balance being magnesium and an unavoidable substance, and having excellent creep characteristics.
【００１４】（第２発明の構成）本発明の耐熱マグネシ
ウム合金は、重量％でＺｎ：１.0〜６.0％、Ｃａ：0.５
〜５.0％と、少なくともＡｌ，Ｚｒ，Ｍｎ，Ｓｉ，Ｓ
ｒ，希土類元素のうちの一種以上を含み、残部がマグネ
シウムと不可避物質とからなり、前記Ａｌは１.0％以
下、Ｚｒ，Ｍｎ，Ｓｉ，Ｓｒは２.0％以下、希土類元素
は３.0％以下であり、優れたクリープ特性を有すること
を特徴とする。(Structure of the Second Invention) The heat-resistant magnesium alloy of the present invention contains Zn: 1.0 to 6.0% by weight and Ca: 0.5% by weight.
~ 5.0% and at least Al, Zr, Mn, Si, S
r, one or more of rare earth elements, the balance consisting of magnesium and unavoidable substances, Al is 1.0% or less, Zr, Mn, Si, Sr is 2.0% or less, and rare earth elements are 3. It is 0% or less, and is characterized by having excellent creep characteristics.
【００１５】[0015]
【作用】本第１発明および第２発明の耐熱マグネシウム
合金が優れた効果を発揮するメカニズムについては、未
だ必ずしも明らかではないが、次のように考えられる。The mechanism by which the heat-resistant magnesium alloys of the first and second aspects of the present invention exert excellent effects is not necessarily clear yet, but is considered as follows.
【００１６】（第１発明の作用）本発明の耐熱マグネシ
ウム合金は、溶質元素量（ａｔ％）は、既存のダイカス
ト合金に比較して少なく、鋳放しでもα−Ｍｇ結晶粒内
の溶質濃度の偏析が小さい。従って、二次クリープ変形
の駆動力となる溶質拡散速度を支配する濃度勾配が小さ
い。また、溶質濃度が比較的高い粒界近傍ではクリープ
変形進行と同時にβ1'、β2'、ＭｇＺｎ、Ｚｎ2 Ｃａ等
が析出し、粒界および母相が強化される。これらが変形
に対する抵抗となり、本合金のクリープ特性が良好なも
のになるものと考えられる。(Operation of the First Invention) The heat-resistant magnesium alloy of the present invention has a smaller solute element amount (at%) than existing die-cast alloys, and has a solute concentration within the α-Mg crystal grains even after casting. Small segregation. Therefore, the concentration gradient that controls the solute diffusion rate, which is the driving force for the secondary creep deformation, is small. Further, in the vicinity of the grain boundary where the solute concentration is relatively high, β 1 ′, β 2 ′, MgZn, Zn 2 Ca, etc. are precipitated simultaneously with the progress of creep deformation, and the grain boundary and the parent phase are strengthened. It is considered that these serve as resistance to deformation and the creep characteristics of the present alloy are improved.
【００１７】亜鉛（Ｚｎ）の含有量は、１.0重量％以上
６.0重量％以下である。Ｚｎは、固溶強化により母相で
あるα−Ｍｇ相を強化する元素である。Ｚｎの含有量が
１.0重量％未満の場合は、静的強度が著しく低いため実
用に耐えない。また、該含有量が６.0重量％を超える場
合は、Ｚｎの固溶量増加にともなう拡散速度の増加と、
強度の低い低融点粒界化合物の晶出が増加しクリープ特
性が悪化する。The content of zinc (Zn) is 1.0% by weight or more and 6.0% by weight or less. Zn is an element that strengthens the α-Mg phase, which is the parent phase, by solid solution strengthening. When the Zn content is less than 1.0% by weight, the static strength is remarkably low and it cannot be put to practical use. Further, when the content exceeds 6.0% by weight, the diffusion rate increases with the increase of the solid solution amount of Zn, and
Crystallization of the low-melting-point grain boundary compound having low strength increases, and the creep characteristics deteriorate.
【００１８】カルシウム（Ｃａ）の含有量は、0.５重量
％以上５.0重量％以下である。Ｃａは、Ｍｇ基地中に固
溶し、α−Ｍｇを強化するとともに残りは未固溶のＺｎ
とともに粒界相を形成し、粒界化合物を強固なものとす
る。このＣａの含有量が0.５重量％未満の場合は、粒界
の強化が不十分で定常クリープ速度は大きくなり、従来
のダイカスト用耐熱マグネシウム合金と同程度になる。
また、該含有量が５.0重量％を超える場合は、脆弱なＭ
ｇ−Ｃａ化合物が多量に生成して、二次クリープ速度お
よび初期変形量がともに増加する。また、静的機械強度
特性である伸びも減少し、構造材としては靱性が不足す
る。The content of calcium (Ca) is 0.5% by weight or more and 5.0% by weight or less. Ca is a solid solution in the Mg base, strengthens α-Mg, and the rest is undissolved Zn.
At the same time, it forms a grain boundary phase and strengthens the grain boundary compound. When the content of Ca is less than 0.5% by weight, the grain boundary is not sufficiently strengthened and the steady-state creep rate increases, which is about the same as that of the conventional heat-resistant magnesium alloy for die casting.
If the content exceeds 5.0% by weight, fragile M
A large amount of g-Ca compound is produced, and both the secondary creep rate and the initial deformation amount increase. In addition, elongation, which is a static mechanical strength characteristic, is also reduced, and toughness is insufficient as a structural material.
【００１９】以上により、本発明の耐熱マグネシウム合
金は、熱処理をしない鋳造のままでクリープ特性に優れ
た耐熱マグネシウム合金とすることができるものと考え
られる。From the above, it is considered that the heat-resistant magnesium alloy of the present invention can be made into a heat-resistant magnesium alloy excellent in creep characteristics as it is in a cast without heat treatment.
【００２０】（第２発明の作用）本第２発明の耐熱マグ
ネシウム合金の作用は、前記第１発明の作用と同様の作
用を奏するのに加えて、下記のような作用を奏する。(Operation of the Second Invention) The operation of the heat-resistant magnesium alloy of the second invention has the following effects in addition to the same effects as the operations of the first invention.
【００２１】すなわち、本発明の耐熱マグネシウム合金
は、重量％で１.0〜６.0％のＺｎと0.５〜５.0％のＣａ
に加えて、さらに第４元素として、少なくともＡｌ，Ｚ
ｒ，Ｍｎ，Ｓｉ，Ｓｒ，希土類元素のうちの一種以上を
含んでなる。これら第４元素を含有することにより、固
溶強化、粒界での晶出物形成、組織の微細化等により、
室温強度および高温強度が向上し、さらに本合金のクリ
ープ特性が良好なものになるものと考えられる。That is, the heat-resistant magnesium alloy of the present invention contains 1.0 to 6.0% Zn and 0.5 to 5.0% Ca by weight.
In addition to the fourth element, at least Al, Z
It contains at least one of r, Mn, Si, Sr, and a rare earth element. By containing these fourth elements, solid solution strengthening, formation of crystallized substances at grain boundaries, refinement of structure, etc.
It is considered that the room temperature strength and the high temperature strength are improved, and further the creep characteristics of the present alloy are improved.
【００２２】アルミニウム（Ａｌ）の含有量は、１.0重
量％以下である。Ａｌは、α−Ｍｇ中に固溶して、静的
強度を向上させる元素である。Ａｌは含有量が増加する
に従って室温での引張強さや耐力は大きくなるが、Ａｌ
の含有量が１.0重量％を超えると二次クリープ速度が大
きくなる。The content of aluminum (Al) is 1.0% by weight or less. Al is an element that forms a solid solution in α-Mg to improve the static strength. As the content of Al increases, the tensile strength and yield strength at room temperature increase, but
If the content of Cr exceeds 1.0% by weight, the secondary creep rate increases.
【００２３】ジルコニウム（Ｚｒ）の含有量は、２.0重
量％以下である。Ｚｒは、結晶粒を微細化し機械的強度
を向上させる元素である。Ｚｒの含有量が２.0重量％を
超えると、固溶量が大幅に越えているのでこれ以上含有
させても微細化の効果は大きくならず、逆に急激な融点
の増加に伴い溶解が困難となる。The content of zirconium (Zr) is 2.0% by weight or less. Zr is an element that refines the crystal grains and improves the mechanical strength. When the content of Zr exceeds 2.0% by weight, the solid solution amount greatly exceeds. Therefore, if the Zr content is further exceeded, the effect of refining does not increase, and conversely the melting increases with a rapid increase in melting point. It will be difficult.
【００２４】マンガン（Ｍｎ）の含有量は、２.0重量％
以下である。Ｍｎは、僅かに固溶することにより耐熱性
を向上させる元素である。Ｚｒの含有量が２.0重量％を
超えると、粗大なＭｎが晶出して機械的強度を劣化させ
る。The content of manganese (Mn) is 2.0% by weight.
It is the following. Mn is an element that improves the heat resistance by slightly forming a solid solution. If the Zr content exceeds 2.0% by weight, coarse Mn crystallizes and deteriorates the mechanical strength.
【００２５】珪素（Ｓｉ）の含有量は、２.0重量％以下
である。Ｓｉは、主に粒界に高融点の化合物を形成して
粒界を強化する元素である。Ｓｉの含有量が２.0重量％
を超えると、脆弱な化合物の増加により靱性が低下す
る。また、ＳｒはＳｉと同様の作用を奏する元素であ
り、含有量およびその理由も同様である。The content of silicon (Si) is 2.0% by weight or less. Si is an element that mainly forms a high melting point compound at the grain boundary to strengthen the grain boundary. Si content is 2.0% by weight
When it exceeds, the toughness decreases due to the increase of brittle compounds. Further, Sr is an element that exhibits the same action as Si, and the content and the reason thereof are also the same.
【００２６】希土類元素（Ｒ．Ｅ．）の含有量は、３.0
重量％以下である。この希土類元素は、固溶および粒界
への晶出によって耐熱強度を向上させる元素である。希
土類元素の含有量が３.0重量％を超えると、靱性が劣化
する。The content of rare earth element (RE) is 3.0.
It is less than or equal to weight%. This rare earth element is an element that improves the heat resistance strength by solid solution and crystallization to grain boundaries. If the content of the rare earth element exceeds 3.0% by weight, the toughness deteriorates.
【００２７】以上により、本発明の耐熱マグネシウム合
金は、熱処理をしない鋳造のままでクリープ特性に優れ
た耐熱マグネシウム合金とすることができるものと考え
られる。From the above, it is considered that the heat-resistant magnesium alloy of the present invention can be made into a heat-resistant magnesium alloy having excellent creep characteristics as it is in a cast state without heat treatment.
【００２８】[0028]
【発明の効果】本第１発明および第２発明の耐熱マグネ
シウム合金は、熱処理をしない鋳造のままでクリープ特
性に優れた耐熱マグネシウム合金とすることができる。
また、本発明の耐熱マグネシウム合金は、従来のＡｌを
多く含有するダイカスト用マグネシウム合金に比べ、ク
リープ特性が優れるため、耐熱ダイカスト用合金として
も使用できる。これより、マグネシウムダイカスト品の
適用範囲が拡大し、各種部品の軽量化が可能となる。EFFECTS OF THE INVENTION The heat-resistant magnesium alloys of the first and second inventions can be heat-resistant magnesium alloys which are excellent in creep characteristics as they are cast without heat treatment.
Further, since the heat-resistant magnesium alloy of the present invention has excellent creep characteristics as compared with the conventional magnesium alloy for die casting containing a large amount of Al, it can be used as a heat-resistant die casting alloy. As a result, the applicable range of magnesium die cast products will be expanded, and it will be possible to reduce the weight of various parts.
【００２９】また、本発明の耐熱マグネシウム合金を使
用することにより、熱処理を施して使用されるＡｇやＺ
ｎ、Ｒ．Ｅ．を含む高価な砂型鋳造合金よりも単純な溶
解作業でクリープ特性の優れた部品を作製することがで
きるので、地金の低コスト化、溶解作業の効率化を達成
することができる。Further, by using the heat-resistant magnesium alloy of the present invention, Ag and Z used after heat treatment are used.
n, R.N. E. Since it is possible to produce a part having excellent creep characteristics by a simple melting operation as compared with an expensive sand casting alloy containing, it is possible to reduce the cost of the ingot and to improve the efficiency of the melting operation.
【００３０】さらに、本第２発明の耐熱マグネシウム合
金は、第４元素として少なくともＡｌ，Ｚｒ，Ｍｎ，Ｓ
ｉ，Ｓｒ，希土類元素のうちの一種以上を含んでなるの
で、前記第１発明の耐熱マグネシウム合金に比べて、静
的強度が優れ、かつクリープ特性がさらに改善される。Furthermore, the heat-resistant magnesium alloy according to the second aspect of the present invention contains at least Al, Zr, Mn, S as the fourth element.
Since it contains at least one of i, Sr, and a rare earth element, it has excellent static strength and further improved creep characteristics as compared with the heat-resistant magnesium alloy of the first invention.
【００３１】[0031]
【実施例】以下に、前記第１発明および第２発明をさら
に具体的にした発明（具体例）について説明する。The inventions (concrete examples) which are more specific than the first and second inventions will be described below.
【００３２】（発明の具体的説明）本第１発明および第
２発明の耐熱マグネシウム合金において、Ｚｎの含有量
が２.0重量％以上５.0重量％以下であることが好まし
い。Ｚｎの含有量を２.0重量％〜５.0重量％とすること
により、Ｚｎによる固溶強化を十分に行うことができる
とともに、二次クリープ速度が小さく、鋳造時の熱間割
れが起こらないので好適である。(Detailed Description of the Invention) In the heat resistant magnesium alloys of the first and second inventions, the Zn content is preferably 2.0% by weight or more and 5.0% by weight or less. By setting the Zn content to 2.0% by weight to 5.0% by weight, solid solution strengthening by Zn can be sufficiently performed, the secondary creep rate is low, and hot cracking during casting occurs. It is preferable because it does not exist.
【００３３】カルシウム（Ｃａ）の含有量は、１.0重量
％以上３.0重量％以下であることが好ましい。Ｃａの含
有量を１.0重量％〜３.0重量％とすることにより、靱性
の劣化が見られず、また二次クリープ速度が極めて低く
なるので好適である。The content of calcium (Ca) is preferably 1.0% by weight or more and 3.0% by weight or less. It is preferable that the content of Ca is 1.0% by weight to 3.0% by weight because deterioration of toughness is not observed and the secondary creep rate is extremely low.
【００３４】また、本第１発明および第２発明の耐熱マ
グネシウム合金において、ＺｎとＣａの両方が粒界を強
化する化合物を形成することが好ましい。従って、固溶
強化に関与しないＺｎをＣａで粒界に固定するために、
（Ｚｎ含有量）／（Ｃａ含有量）＝１〜８であることが
好ましい。In the heat-resistant magnesium alloys of the first and second inventions, it is preferable that both Zn and Ca form a compound that strengthens the grain boundary. Therefore, in order to fix Zn, which is not involved in solid solution strengthening, at the grain boundary with Ca,
(Zn content) / (Ca content) = 1 to 8 is preferable.
【００３５】本発明の耐熱マグネシウム合金の製造方法
の一例を簡単に示すと、以下のようである。すなわち、
本合金は、各元素を純金属、合金または塩化物やフッ化
物の形態で溶融Ｍｇに添加し、鋳造することにより、良
好なクリープ特性を有する耐熱マグネシウム合金を得る
ことができる。なお、溶解作業中には、従来のマグネシ
ウム合金と同様にＳＦ6 ガスやフラックス等による防燃
や精錬を必要において行うことが好ましい。An example of the method for producing the heat-resistant magnesium alloy of the present invention will be briefly described as follows. That is,
In the present alloy, a heat-resistant magnesium alloy having good creep characteristics can be obtained by adding each element to molten Mg in the form of a pure metal, alloy or chloride or fluoride and casting. During the melting operation, it is preferable to perform flameproofing or refining with SF 6 gas, flux, or the like, as in conventional magnesium alloys.
【００３６】第１実施例 電気炉中で予熱した高クロム合金鋼（SUS430）製坩堝
（内径：80mm，高さ：230 mm）の内面に、塩化マグネシ
ウム系のフラックスを塗布し、その中に純Ｍｇ地金を投
入して溶解した。７００℃に保持した溶湯に金属Ｚｎ、
Ｃａを所定量添加し、これらが完全に溶解したことを確
認してから、精錬を行った。精錬終了後、７００℃から
７５０℃に昇温・保持した。添加金属が溶解したことを
確認したのち、１０分間保持してから１５０℃に予熱し
た舟金型に注湯し、自然冷却することにより鋳造した。
なお、溶解・鋳造作業中は、燃焼防止のために溶湯表面
にＳＦ6 ガスを0.２ｌ／min.吹きつけるとともに、適宜
フラックスを溶湯表面に散布した。EXAMPLE 1 Magnesium chloride flux was applied to the inner surface of a crucible (internal diameter: 80 mm, height: 230 mm) made of high chromium alloy steel (SUS430) preheated in an electric furnace, and pure magnesium was applied to the inner surface of the crucible. Mg ingot was charged and melted. Metal Zn in molten metal kept at 700 ° C
A predetermined amount of Ca was added, and after confirming that they were completely dissolved, refining was performed. After the refining was completed, the temperature was raised from 700 ° C to 750 ° C and maintained. After confirming that the added metal was melted, it was held for 10 minutes, poured into a boat mold preheated to 150 ° C., and naturally cooled to cast.
During the melting / casting work, SF 6 gas was blown to the surface of the molten metal at 0.2 l / min to prevent combustion, and a flux was appropriately sprinkled on the surface of the molten metal.
【００３７】次いで、舟型鋳物から、φ８mm，ｌ＝１０
０mmの試験片を採取し、等分布荷重が作用する条件で曲
げクリープ試験を行った。この時の最大作用応力は、６
０ＭＰａ（弾性式による）であった。得られた結果を、
Ｚｎの添加量を種々変化させたもの（Ｃａは１重量％）
の初期変形量（試験開始１時間後のたわみ量）と二次ク
リープ変形速度（試験開始５０時間−１５０時間での一
時間当りの平均たわみ量）を表１に、Ｃａの添加量を種
々変化させたもの（Ｚｎは４重量％）の結果を表２に、
それぞれ示す。Then, from the boat-shaped casting, φ8 mm, l = 10
A 0 mm test piece was sampled and subjected to a bending creep test under the condition that a uniformly distributed load acts. The maximum applied stress at this time is 6
It was 0 MPa (according to the elastic formula). The results obtained are
Various additions of Zn (1 wt% Ca)
Table 1 shows the initial deformation amount (deflection amount 1 hour after the start of the test) and secondary creep deformation rate (average deflection amount per hour from the test start time of 50 hours to 150 hours), and the amount of Ca added was changed variously. Table 2 shows the results of those (Zn is 4% by weight).
Shown respectively.
【００３８】[0038]
【表１】 [Table 1]
【００３９】[0039]
【表２】 [Table 2]
【００４０】なお、比較のために、ＺｎおよびＣａ含有
量を本発明の範囲外の量としたほかは、前記実施例と同
様にして比較用マグネシウム合金を得、同様に性能評価
試験をクリープ試験によって行った。得られた結果を、
同様に表１および表２に併せて示す。For comparison, a magnesium alloy for comparison was obtained in the same manner as in the above-mentioned Examples except that the contents of Zn and Ca were out of the range of the present invention, and the performance evaluation test was conducted in the creep test. Went by. The results obtained are
Similarly, it is also shown in Table 1 and Table 2.
【００４１】また、本実施例のＭｇ−４％Ｚｎ−１％Ｃ
ａ合金（試料番号８）と比較例として従来合金４種、Ａ
Ｓ４１（試料番号：Ｃ６）、ＺＥ４１（試料番号：Ｃ
７）、ＡＥ４２（試料番号：Ｃ８）、ＡＺ９１（試料番
号：Ｃ９）との試験結果を、図１に示す。Further, Mg-4% Zn-1% C of this embodiment is used.
Alloy a (Sample No. 8) and conventional alloy 4 as a comparative example, A
S41 (sample number: C6), ZE41 (sample number: C
7), AE42 (sample number: C8), and AZ91 (sample number: C9) test results are shown in FIG.
【００４２】図１より、従来合金（比較例：試料番号Ｃ
６〜Ｃ９）の１５０時間でのたわみ量が１.5 mm である
のに対し、本実施例のＭｇ−４％Ｚｎ−１％Ｃａ合金で
は１mm以下であり、本実施例の耐熱マグネシウム合金は
クリープ特性に大変優れていることが分かる。また、表
１より、Ｚｎの含有量が１重量％未満では初期変形量が
極端に大きく、８重量％を超えると再び初期変形量が大
きくなり、６重量％を超えると二次クリープ速度が大き
くなりはじめることが分かる。また、表２より、Ｃａの
含有量が0.５重量％未満では該元素の添加による効果が
見られず、５重量％を超えると二次クリープ速度が大き
くなりはじめることが分かる。また、この時靱性も低下
する。From FIG. 1, a conventional alloy (comparative example: sample number C)
6-C9) has a deflection of 1.5 mm for 150 hours, whereas the Mg-4% Zn-1% Ca alloy of this example has a deflection of 1 mm or less. It can be seen that the creep characteristics are very excellent. Further, from Table 1, the initial deformation amount is extremely large when the Zn content is less than 1% by weight, the initial deformation amount increases again when the Zn content exceeds 8% by weight, and the secondary creep rate increases when the Zn content exceeds 6% by weight. You can see that it begins to become. In addition, it can be seen from Table 2 that when the content of Ca is less than 0.5% by weight, the effect of the addition of the element is not observed, and when it exceeds 5% by weight, the secondary creep rate starts to increase. At this time, the toughness also decreases.
【００４３】第２実施例 前記第１実施例と同様にして、前記実施例の試料番号８
のＭｇ−４％Ｚｎ−１％Ｃａ合金に対して、さらにＺ
ｒ，Ｓｉ，Ａｌ，Ｍｎ，Ｓｒ，Ｒ．Ｅ．を添加し、同様
にして本実施例の耐熱マグネシウム合金を鋳造した。得
られたマグネシウム合金の性能評価試験を、前記第１実
施例と同様にしてクリープ試験により行った。その結果
を、図２に示す。 Second Embodiment Similar to the first embodiment, the sample No. 8 of the above embodiment is used.
Of Mg-4% Zn-1% Ca alloy of
r, Si, Al, Mn, Sr, R.R. E. Was added, and the heat-resistant magnesium alloy of this example was cast in the same manner. The performance evaluation test of the obtained magnesium alloy was conducted by the creep test in the same manner as in the first embodiment. The result is shown in FIG.
【００４４】図２より明かのように、それぞれの添加元
素Ｚｒ，Ｓｉ，Ａｌ，Ｍｎ，Ｓｒ，Ｒ．Ｅ．は、マグネ
シウム合金のクリープ特性改善に有効であり、特に、Ｚ
ｒ，Ｓｒ，Ｒ．Ｅ．，Ｍｎ，Ｓｉは初期の変形、二次ク
リープ速度ともに改善することが分かる。Ａｌは、初期
の変形量を小さくするが、二次クリープ速度を大きくす
ることが分かる。As is clear from FIG. 2, the respective additive elements Zr, Si, Al, Mn, Sr, R. E. Is effective for improving the creep characteristics of magnesium alloys, and in particular Z
r, Sr, R.R. E. , Mn, and Si improve both initial deformation and secondary creep rate. It can be seen that Al reduces the amount of initial deformation but increases the secondary creep rate.
【図１】第１実施例のＭｇ−Ｚｎ−Ｃａ合金と比較用Ｍ
ｇ合金の試験経過時間とたわみ量との関係を示す図であ
る。FIG. 1 is a Mg-Zn-Ca alloy of the first embodiment and M for comparison.
It is a figure which shows the relationship between the test elapsed time and the amount of deflection of g alloy.
【図２】第２実施例により得られた耐熱マグネシウム合
金のクリープ試験結果を示す図である。FIG. 2 is a diagram showing a creep test result of a heat resistant magnesium alloy obtained in a second example.
８ ・・・ 試料番号８ Ｃ６ ・・・ 試料番号Ｃ６ Ｃ７ ・・・ 試料番号Ｃ７ Ｃ８ ・・・ 試料番号Ｃ８ Ｃ９ ・・・ 試料番号Ｃ９ 8 ... Sample No. 8 C6 ... Sample No. C6 C7 ... Sample No. C7 C8 ... Sample No. C8 C9 ... Sample No. C9
───────────────────────────────────────────────────── フロントページの続き (72)発明者 粟野 洋司 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 鈴木 康行 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 竹内 正 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 射場 英紀 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 松井 彰 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Awano 41, Nagakute-cho, Aichi-gun, Aichi-gun, Nagakute-cho 1st in Yokosuka Central Research Institute Co., Ltd. (72) Inventor Yasuyuki Suzuki 1-cho, Toyota-cho, Aichi Inside Toyota Motor Co., Ltd. (72) Inventor Masaru Takeuchi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Hideki Eki 1 Town, Toyota Town, Aichi Prefecture Toyota Motor Co., Ltd. (72 ) Inventor Akira Matsui 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.
Claims (2)
５〜５.0％を含み、残部がマグネシウムと不可避物質と
からなり、優れたクリープ特性を有することを特徴とす
る耐熱マグネシウム合金。1. Zn: 1.0 to 6.0% by weight and Ca: 0.0.
A heat-resistant magnesium alloy, characterized by containing 5 to 5.0%, the balance being magnesium and an unavoidable substance, and having excellent creep properties.
５〜５.0％と、少なくともＡｌ，Ｚｒ，Ｍｎ，Ｓｉ，Ｓ
ｒ，希土類元素のうちの一種以上を含み、残部がマグネ
シウムと不可避物質とからなり、 前記Ａｌは１.0％以下、Ｚｒ，Ｍｎ，Ｓｉ，Ｓｒは２.0
％以下、希土類元素は３.0％以下であり、優れたクリー
プ特性を有することを特徴とする耐熱マグネシウム合
金。2. Zn: 1.0 to 6.0% and Ca: 0.0% by weight.
5 to 5.0% and at least Al, Zr, Mn, Si, S
r, one or more of rare earth elements, the balance consisting of magnesium and an unavoidable substance, Al is 1.0% or less, Zr, Mn, Si and Sr are 2.0.
%, The rare earth element is 3.0% or less, and a heat-resistant magnesium alloy having excellent creep properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18913493A JP3204572B2 (en) | 1993-06-30 | 1993-06-30 | Heat resistant magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18913493A JP3204572B2 (en) | 1993-06-30 | 1993-06-30 | Heat resistant magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0718364A true JPH0718364A (en) | 1995-01-20 |
| JP3204572B2 JP3204572B2 (en) | 2001-09-04 |
Family
ID=16235982
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|---|---|---|---|
| JP18913493A Expired - Fee Related JP3204572B2 (en) | 1993-06-30 | 1993-06-30 | Heat resistant magnesium alloy |
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