JPH0625790A - High-strength magnesium alloy - Google Patents
High-strength magnesium alloyInfo
- Publication number
- JPH0625790A JPH0625790A JP4097321A JP9732192A JPH0625790A JP H0625790 A JPH0625790 A JP H0625790A JP 4097321 A JP4097321 A JP 4097321A JP 9732192 A JP9732192 A JP 9732192A JP H0625790 A JPH0625790 A JP H0625790A
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- weight
- strength
- magnesium alloy
- alloy
- high temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は室温及び高温強度に優れ
たマグネシウム合金に関し、より詳しくは自動車エンジ
ン部品などの軽量化において要請されている４７３Ｋ程
度までの高温でも十分な強度を有するマグネシウム合金
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesium alloy having excellent strength at room temperature and high temperature, and more particularly to a magnesium alloy having sufficient strength even at high temperatures up to about 473K which is required for weight reduction of automobile engine parts. .
【０００２】[0002]
【従来の技術】近年地球環境保全の意識の高まりから、
自動車の燃費向上の要請が強まり、自動車用軽量材料の
開発が強く求められようになってきた。2. Description of the Related Art Due to the increasing awareness of global environmental protection in recent years,
With the increasing demand for improved fuel efficiency of automobiles, the development of lightweight materials for automobiles has been strongly demanded.
【０００３】マグネシウム合金は現在実用化されている
金属材料の中で最も低密度であり、今後の自動車用軽量
材料として強く期待されている。現在最も一般的に用い
られているマグネシウム合金はＭｇ−Ａｌ−Ｚｎ−Ｍｎ
系合金（例えば、ＡＺ９１合金＝Ｍｇ−９Ａｌ−１Ｚｎ
−０．５Ｍｎ）であり、この合金の鋳造技術等の周辺技
術は完成段階にあり、自動車軽量化にあたって先ずこの
合金が検討されている。また、耐熱用マグネシウム合金
としてマグネシウムに希土類元素（ＲＥ）を添加した合
金、例えばＭｇ−ＲＥ−Ｚｒ系合金が開発されている。Magnesium alloy has the lowest density among the metallic materials currently put into practical use, and is strongly expected as a lightweight material for automobiles in the future. Currently, the most commonly used magnesium alloy is Mg-Al-Zn-Mn.
System alloy (for example, AZ91 alloy = Mg-9Al-1Zn)
-0.5 Mn), peripheral technologies such as casting technology of this alloy are in the completion stage, and this alloy is first studied for weight reduction of automobiles. Further, as a heat-resistant magnesium alloy, an alloy in which a rare earth element (RE) is added to magnesium, such as an Mg-RE-Zr alloy, has been developed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
Ｍｇ−Ａｌ−Ｚｎ−Ｍｎ系合金は３９３Ｋ以上で強度が
低下し、自動車エンジン部品の中でも耐熱性が要求され
る用途には適さない。また、上記の耐熱性Ｍｇ−ＲＥ−
Ｚｒ系合金においてはＲＥは重元素であるため溶湯中で
ＲＥが下部に偏る傾向があり、また必須成分として用い
ているＺｒの添加が不安定であり、コスト高になる。However, the above-mentioned Mg-Al-Zn-Mn-based alloy has a reduced strength at 393 K or higher and is not suitable for use in automobile engine parts where heat resistance is required. In addition, the above heat-resistant Mg-RE-
In a Zr-based alloy, since RE is a heavy element, RE tends to be biased downward in the molten metal, and addition of Zr, which is used as an essential component, is unstable, resulting in high cost.
【０００５】本発明は、このような従来技術の有する課
題に鑑みてなされたものであり、本発明の目的は、耐熱
性と室温強度の両方が要求される自動車エンジン部品用
材料に適した新規な高強度マグネシウム合金を提供する
ことにある。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is a novel material suitable for a material for automobile engine parts which is required to have both heat resistance and room temperature strength. To provide a high strength magnesium alloy.
【０００６】[0006]
【課題を解決するための手段】本発明者等は上記の課題
を解決するために種々検討を重ねた結果、マグネシウム
に適量のアルミニウムと適量のカルシウムとを所定の比
率で添加することにより室温及び高温での強度が向上す
ることを見出した。Means for Solving the Problems The inventors of the present invention have conducted various studies to solve the above problems, and as a result, by adding an appropriate amount of aluminum and an appropriate amount of calcium to magnesium at a predetermined ratio, It was found that the strength at high temperature is improved.
【０００７】上記ＡＺ合金等にカルシウムを添加するこ
とにより室温及び高温での強度が向上することは既に知
られている。しかしながら、これらの場合のカルシウム
添加量は一般に０．１５重量％以下であり、ＡＺ合金の
強度を補完するする程度に用いられているに過ぎない。
これに対し、カルシウム添加量を１．４〜１０重量％と
し、且つアルミニウム添加量の０．７倍以上とすること
により室温及び高温での強度が著しく向上することを見
出し、本発明に到達した。It is already known that the strength at room temperature and high temperature is improved by adding calcium to the AZ alloy and the like. However, the amount of calcium added in these cases is generally 0.15% by weight or less, and it is merely used to complement the strength of the AZ alloy.
On the other hand, it was found that the strength at room temperature and high temperature was remarkably improved by setting the added amount of calcium to 1.4 to 10% by weight and the added amount of aluminum to 0.7 times or more, and arrived at the present invention. .
【０００８】即ち、本発明の室温及び高温強度に優れた
マグネシウム合金はアルミニウム２〜１０重量％及びカ
ルシウム１．４〜１０重量％を含有し、Ｃａ／Ａｌの比
が０．７以上であり、残部がマグネシウムと不可避の不
純物からなることを特徴とする。That is, the magnesium alloy of the present invention excellent in strength at room temperature and high temperature contains 2 to 10% by weight of aluminum and 1.4 to 10% by weight of calcium, and has a Ca / Al ratio of 0.7 or more, The balance is characterized by being composed of magnesium and inevitable impurities.
【０００９】本発明の室温及び高温強度に優れたマグネ
シウム合金は、所望により、更にそれぞれ２重量％以下
の亜鉛、マンガン、ジルコニウム及びケイ素、及び４重
量％以下の希土類元素（例えば、イットリウム、ネオジ
ム、ランタン、セリウム、ミッシュメタル）からなる群
から選ばれた少なくとも１種の元素を含有することがで
きる。If desired, the magnesium alloy excellent in room temperature and high temperature strength of the present invention further comprises 2% by weight or less of zinc, manganese, zirconium and silicon, respectively, and 4% by weight or less of a rare earth element (eg yttrium, neodymium, It can contain at least one element selected from the group consisting of lanthanum, cerium, and misch metal.
【００１０】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、アルミニウムはマグネシウム固
溶し、時効硬化性を示し、合金の機械的性質を向上させ
る。アルミニウムの添加効果はその添加量の増加に伴っ
て増加するが、２重量％未満では不十分であり、また１
０重量％で飽和に達する。更にアルミニウムの添加量が
増加するに従って合金の伸びが低下する。従って、本発
明の室温及び高温強度に優れたマグネシウム合金におい
てはアルミニウム添加量を２〜１０重量％、好ましくは
３〜９重量％とする。In the magnesium alloy of the present invention excellent in strength at room temperature and high temperature, aluminum is solid-dissolved in magnesium and exhibits age hardenability to improve the mechanical properties of the alloy. The effect of addition of aluminum increases with an increase in the amount of addition, but if it is less than 2% by weight, it is insufficient.
Saturation is reached at 0% by weight. Furthermore, as the amount of aluminum added increases, the elongation of the alloy decreases. Therefore, in the magnesium alloy of the present invention excellent in room temperature and high temperature strength, the amount of aluminum added is set to 2 to 10% by weight, preferably 3 to 9% by weight.
【００１１】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、カルシウムは高温強度の向上に
有効な元素である。しかしカルシウムの添加量が１．４
重量％未満の場合及びＣａ／Ａｌの比が０．７未満の場
合にはその合金の高温強度が不十分である。またカルシ
ウム添加量の増加に伴って高温強度は向上するが、コス
ト高になる。コスト面を考慮するとカルシウムを１０重
量％を越えて添加してもメリットがない。Ｃａ／Ａｌの
比を０．７以上にするとマグネシウム合金中に晶出する
析出物の組織形態が変化し、Ｍｇ−Ｃａ化合物が晶出し
て優れた高温強度特性を示すようになる。従って、本発
明の室温及び高温強度に優れたマグネシウム合金におい
てはカルシウム添加量を１．４〜１０重量％、好ましく
は２〜８重量％とし、Ｃａ／Ａｌの比を０．７以上、好
ましくは０．７５以上とする。In the magnesium alloy of the present invention excellent in strength at room temperature and high temperature, calcium is an element effective for improving high temperature strength. However, the amount of calcium added is 1.4
If it is less than wt% or if the Ca / Al ratio is less than 0.7, the high temperature strength of the alloy is insufficient. Further, although the high temperature strength improves as the amount of calcium added increases, the cost increases. Considering the cost, there is no merit in adding calcium in excess of 10% by weight. When the ratio of Ca / Al is 0.7 or more, the structure morphology of the precipitate crystallized in the magnesium alloy changes, and the Mg-Ca compound crystallizes to exhibit excellent high temperature strength characteristics. Therefore, in the magnesium alloy excellent in room temperature and high temperature strength of the present invention, the calcium addition amount is 1.4 to 10% by weight, preferably 2 to 8% by weight, and the Ca / Al ratio is 0.7 or more, preferably It should be 0.75 or more.
【００１２】Ｍｇ−Ａｌ合金に一般に２重量％以下の量
で添加されている亜鉛は本発明のマグネシウム合金にお
いても有効であり、強度を向上させる効果を有する。し
かし亜鉛の添加量が２重量％を越えるとＭｇ−Ａｌ化合
物の晶出が生じるので好ましくない。Zinc, which is generally added to the Mg-Al alloy in an amount of 2% by weight or less, is also effective in the magnesium alloy of the present invention and has the effect of improving strength. However, if the amount of zinc added exceeds 2% by weight, crystallization of the Mg-Al compound occurs, which is not preferable.
【００１３】Ｍｇ合金に一般に２重量％以下の量で添加
されているジルコニウム及びマンガンは本発明のマグネ
シウム合金においても有効であり、組織を微細にし、強
度を向上させる効果を有する。Zirconium and manganese, which are generally added to the Mg alloy in an amount of 2% by weight or less, are effective in the magnesium alloy of the present invention, and have the effects of making the structure fine and improving the strength.
【００１４】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、ケイ素とカルシウムとの組合わ
せは極めて有効であり、高温強度を向上させる効果を有
する。しかしケイ素の添加量が２重量％を越えると初晶
Ｍｇ2 Ｓｉが粗大となり、機械的強度が低下するので好
ましくない。In the magnesium alloy of the present invention excellent in strength at room temperature and high temperature, the combination of silicon and calcium is extremely effective and has the effect of improving high temperature strength. However, if the amount of silicon added exceeds 2% by weight, the primary crystal Mg 2 Si will become coarse and the mechanical strength will decrease, such being undesirable.
【００１５】希土類元素（例えば、イットリウム、ネオ
ジム、ランタン、セリウム、ミッシュメタル）はマグネ
シウム合金の高温強度を向上させることは公知であり、
最近は、特にネオジム及びイットリウムが耐熱用マグネ
シウム合金に使われている。この効果はカルシウムとの
併用により更に向上することが判明した。この併用によ
る効果の向上は希土類元素添加量４重量％で飽和する。
コスト面を考慮すると希土類元素を４重量％を越えて添
加してもメリットがない。It is known that rare earth elements (eg yttrium, neodymium, lanthanum, cerium, misch metal) improve the high temperature strength of magnesium alloys,
Recently, neodymium and yttrium have been used especially in heat-resistant magnesium alloys. It was found that this effect is further improved by the combined use with calcium. The improvement of the effect by this combined use is saturated when the amount of the rare earth element added is 4% by weight.
Considering the cost, there is no merit in adding rare earth elements in excess of 4% by weight.
【００１６】[0016]
実施例１〜１２及び比較例１〜３ アルゴン雰囲気の真空溶解炉に、表１に示す組成の合金
となるように原材料をを装入し、溶解させた。坩堝とし
てＳＵＳ３０４材を使用し、フラックス等は使用しなか
った。その溶湯を２５mm×５０mm×３００mmの金型中に
鋳込んで試験用鋳物を作成した。このようにして得た試
験用鋳物からＪＩＳ４号試験片を作成した。なお、熱処
理はいずれも５００Ｋ、１０時間である。これらの試験
片を用いて以下の試験を実施した： 引張試験：インストロン引張試験機によりクロスヘッド
速度１０mm/min、測定温度２９８Ｋ及び４７３Ｋ、引張
強度の測定単位＝ＭＰａ、破断時伸び＝％で測定。 測定結果は表１に示す通りであった（表中の％は破断時
伸びである）。Examples 1 to 12 and Comparative Examples 1 to 3 Raw materials were charged and melted in a vacuum melting furnace in an argon atmosphere so that alloys having the compositions shown in Table 1 were obtained. SUS304 material was used as the crucible, and no flux or the like was used. The molten metal was cast into a mold of 25 mm × 50 mm × 300 mm to prepare a test casting. A JIS No. 4 test piece was prepared from the test casting thus obtained. The heat treatment is 500K for 10 hours. The following tests were carried out using these test pieces: Tensile test: Crosshead speed 10 mm / min, measuring temperature 298K and 473K, measuring unit of tensile strength = MPa, elongation at break =% by Instron tensile tester Measurement. The measurement results were as shown in Table 1 (% in the table is elongation at break).
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【発明の効果】本発明のマグネシウム合金は、従来実用
されている汎用のＭｇ−Ａｌ−Ｚｎ−Ｍｎ系合金よりも
室温及び高温強度に優れており、軽量且つ耐熱性が要求
される自動車エンジン部品に適した汎用の耐熱性軽量マ
グネシウム合金である。INDUSTRIAL APPLICABILITY The magnesium alloy of the present invention is superior in room-temperature and high-temperature strength to the conventionally used general-purpose Mg-Al-Zn-Mn alloys, and is lightweight and heat-resistant automobile engine parts. It is a general-purpose heat-resistant lightweight magnesium alloy suitable for.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年５月２２日[Submission date] May 22, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 高強度マグネシウム合金[Title of Invention] High-strength magnesium alloy
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は室温及び高温強度に優れ
たマグネシウム合金に関し、より詳しくは自動車エンジ
ン部品などの軽量化において要請されている４７３Ｋ程
度までの高温でも十分な強度を有するマグネシウム合金
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesium alloy having excellent strength at room temperature and high temperature, and more particularly to a magnesium alloy having sufficient strength even at high temperatures up to about 473K which is required for weight reduction of automobile engine parts. .
【０００２】[0002]
【従来の技術】近年地球環境保全の意識の高まりから、
自動車の燃費向上の要請が強まり、自動車用軽量材料の
開発が強く求められようになってきた。2. Description of the Related Art Due to the increasing awareness of global environmental protection in recent years,
With the increasing demand for improved fuel efficiency of automobiles, the development of lightweight materials for automobiles has been strongly demanded.
【０００３】マグネシウム合金は現在実用化されている
金属材料の中で最も低密度であり、今後の自動車用軽量
材料として強く期待されている。現在最も一般的に用い
られているマグネシウム合金はＭｇ−Ａｌ−Ｚｎ−Ｍｎ
系合金（例えば、ＡＺ９１合金＝Ｍｇ−９Ａｌ−１Ｚｎ
−０．５Ｍｎ）であり、この合金の鋳造技術等の周辺技
術は完成段階にあり、自動車軽量化にあたって先ずこの
合金が検討されている。また、耐熱用マグネシウム合金
としてマグネシウムに希土類元素（ＲＥ）を添加した合
金、例えばＭｇ−ＲＥ−Ｚｒ系合金が開発されている。Magnesium alloy has the lowest density among the metallic materials currently put into practical use, and is strongly expected as a lightweight material for automobiles in the future. Currently, the most commonly used magnesium alloy is Mg-Al-Zn-Mn.
System alloy (for example, AZ91 alloy = Mg-9Al-1Zn)
-0.5 Mn), peripheral technologies such as casting technology of this alloy are in the completion stage, and this alloy is first studied for weight reduction of automobiles. Further, as a heat-resistant magnesium alloy, an alloy in which a rare earth element (RE) is added to magnesium, such as an Mg-RE-Zr alloy, has been developed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
Ｍｇ−Ａｌ−Ｚｎ−Ｍｎ系合金は３９３Ｋ以上で強度が
低下し、自動車エンジン部品の中でも耐熱性が要求され
る用途には適さない。また、上記の耐熱性Ｍｇ−ＲＥ−
Ｚｒ系合金においてはＲＥは重元素であるため溶湯中で
ＲＥが下部に偏る傾向があり、また必須成分として用い
ているＺｒの添加が不安定であり、コスト高になる。However, the above-mentioned Mg-Al-Zn-Mn-based alloy has a reduced strength at 393 K or higher and is not suitable for use in automobile engine parts where heat resistance is required. In addition, the above heat-resistant Mg-RE-
In a Zr-based alloy, since RE is a heavy element, RE tends to be biased downward in the molten metal, and addition of Zr, which is used as an essential component, is unstable, resulting in high cost.
【０００５】本発明は、このような従来技術の有する課
題に鑑みてなされたものであり、本発明の目的は、耐熱
性と室温強度の両方が要求される自動車エンジン部品用
材料に適した新規な高強度マグネシウム合金を提供する
ことにある。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is a novel material suitable for a material for automobile engine parts which is required to have both heat resistance and room temperature strength. To provide a high strength magnesium alloy.
【０００６】[0006]
【課題を解決するための手段】本発明者等は上記の課題
を解決するために種々検討を重ねた結果、マグネシウム
に適量のアルミニウムと適量のカルシウムとを所定の比
率で添加することにより室温及び高温での強度が向上す
ることを見出した。Means for Solving the Problems The inventors of the present invention have conducted various studies to solve the above problems, and as a result, by adding an appropriate amount of aluminum and an appropriate amount of calcium to magnesium at a predetermined ratio, It was found that the strength at high temperature is improved.
【０００７】上記ＡＺ合金等にカルシウムを添加するこ
とにより室温及び高温での強度が向上することは既に知
られている。しかしながら、これらの場合のカルシウム
添加量は一般に０．１５重量％以下であり、ＡＺ合金の
強度を補完するする程度に用いられているに過ぎない。
これに対し、カルシウム添加量を１．４〜１０重量％と
し、且つアルミニウム添加量の０．７倍以上とすること
により室温及び高温での強度が著しく向上することを見
出し、本発明に到達した。It is already known that the strength at room temperature and high temperature is improved by adding calcium to the AZ alloy and the like. However, the amount of calcium added in these cases is generally 0.15% by weight or less, and it is merely used to complement the strength of the AZ alloy.
On the other hand, it was found that the strength at room temperature and high temperature was remarkably improved by setting the added amount of calcium to 1.4 to 10% by weight and the added amount of aluminum to 0.7 times or more, and arrived at the present invention. .
【０００８】即ち、本発明の室温及び高温強度に優れた
マグネシウム合金はアルミニウム２〜１０重量％及びカ
ルシウム１．４〜１０重量％を含有し、Ｃａ／Ａｌの比
が０．７以上であり、残部がマグネシウムと不可避の不
純物からなることを特徴とする。That is, the magnesium alloy of the present invention excellent in strength at room temperature and high temperature contains 2 to 10% by weight of aluminum and 1.4 to 10% by weight of calcium, and has a Ca / Al ratio of 0.7 or more, The balance is characterized by being composed of magnesium and inevitable impurities.
【０００９】本発明の室温及び高温強度に優れたマグネ
シウム合金は、所望により、更にそれぞれ２重量％以下
の亜鉛及びケイ素、及び４重量％以下の希土類元素（例
えば、イットリウム、ネオジム、ランタン、セリウム、
ミッシュメタル）からなる群から選ばれた少なくとも１
種の元素を含有することができる。[0009] at room temperature and excellent magnesium alloy high-temperature strength of the present invention optionally, further each 2 wt% or less of nitrous Namari及 beauty silicon, and 4 wt% or less of rare earth elements (e.g., yttrium, neodymium, lanthanum, cerium,
At least one selected from the group consisting of misch metal)
It may contain seed elements.
【００１０】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、アルミニウムはマグネシウムに
固溶し、時効硬化性を示し、合金の機械的性質を向上さ
せる。アルミニウムの添加効果はその添加量の増加に伴
って増加するが、２重量％未満では不十分であり、また
１０重量％で飽和に達する。更にアルミニウムの添加量
が増加するに従って合金の伸びが低下する。従って、本
発明の室温及び高温強度に優れたマグネシウム合金にお
いてはアルミニウム添加量を２〜１０重量％、好ましく
は３〜９重量％とする。[0010] In excellent magnesium alloy to room temperature and high temperature strength of the present invention, aluminum is <br/> solid solution in magnesium, shows the age-hardening properties, improve the mechanical properties of the alloy. The effect of addition of aluminum increases as the amount of aluminum added increases, but it is insufficient at less than 2% by weight and reaches saturation at 10% by weight. Furthermore, as the amount of aluminum added increases, the elongation of the alloy decreases. Therefore, in the magnesium alloy of the present invention excellent in room temperature and high temperature strength, the amount of aluminum added is set to 2 to 10% by weight, preferably 3 to 9% by weight.
【００１１】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、カルシウムは高温強度の向上に
有効な元素である。しかしカルシウムの添加量が１．４
重量％未満の場合及びＣａ／Ａｌの比が０．７未満の場
合にはその合金の高温強度が不十分である。またカルシ
ウム添加量の増加に伴って高温強度は向上するが、コス
ト高になる。コスト面を考慮するとカルシウムを１０重
量％を越えて添加してもメリットがない。Ｃａ／Ａｌの
比を０．７以上にするとマグネシウム合金中に晶出する
析出物の組織形態が変化し、Ｍｇ−Ｃａ化合物が晶出し
て優れた高温強度特性を示すようになる。従って、本発
明の室温及び高温強度に優れたマグネシウム合金におい
てはカルシウム添加量を１．４〜１０重量％、好ましく
は２〜８重量％とし、Ｃａ／Ａｌの比を０．７以上、好
ましくは０．７５以上とする。In the magnesium alloy of the present invention excellent in strength at room temperature and high temperature, calcium is an element effective for improving high temperature strength. However, the amount of calcium added is 1.4
If it is less than wt% or if the Ca / Al ratio is less than 0.7, the high temperature strength of the alloy is insufficient. Further, although the high temperature strength improves as the amount of calcium added increases, the cost increases. Considering the cost, there is no merit in adding calcium in excess of 10% by weight. When the ratio of Ca / Al is 0.7 or more, the structure morphology of the precipitate crystallized in the magnesium alloy changes, and the Mg-Ca compound crystallizes to exhibit excellent high temperature strength characteristics. Therefore, in the magnesium alloy excellent in room temperature and high temperature strength of the present invention, the calcium addition amount is 1.4 to 10% by weight, preferably 2 to 8% by weight, and the Ca / Al ratio is 0.7 or more, preferably It should be 0.75 or more.
【００１２】Ｍｇ−Ａｌ合金に一般に２重量％以下の量
で添加されている亜鉛は本発明のマグネシウム合金にお
いても有効であり、強度を向上させる効果を有する。し
かし亜鉛の添加量が２重量％を越えるとＭｇ−Ａｌ化合
物の晶出が生じるので好ましくない。Zinc, which is generally added to the Mg-Al alloy in an amount of 2% by weight or less, is also effective in the magnesium alloy of the present invention and has the effect of improving strength. However, if the amount of zinc added exceeds 2% by weight, crystallization of the Mg-Al compound occurs, which is not preferable.
【００１３】本発明の室温及び高温強度に優れたマグネ
シウム合金においては、ケイ素とカルシウムとの組合わ
せは極めて有効であり、高温強度を向上させる効果を有
する。しかしケイ素の添加量が２重量％を越えると初晶
Ｍｇ2 Ｓｉが粗大となり、機械的強度が低下するので好
ましくない。In the magnesium alloy of the present invention which is excellent in room temperature and high temperature strength, the combination of silicon and calcium is extremely effective and has an effect of improving high temperature strength. However, if the amount of silicon added exceeds 2% by weight, the primary crystal Mg 2 Si will become coarse and the mechanical strength will decrease, such being undesirable.
【００１４】希土類元素（例えば、イットリウム、ネオ
ジム、ランタン、セリウム、ミッシュメタル）はマグネ
シウム合金の高温強度を向上させることは公知であり、
最近は、特にネオジム及びイットリウムが耐熱用マグネ
シウム合金に使われている。この効果はカルシウムとの
併用により更に向上することが判明した。この併用によ
る効果の向上は希土類元素添加量４重量％で飽和する。
コスト面を考慮すると希土類元素を４重量％を越えて添
加してもメリットがない。It is known that rare earth elements (eg yttrium, neodymium, lanthanum, cerium, misch metal) improve the high temperature strength of magnesium alloys,
Recently, neodymium and yttrium have been used especially in heat-resistant magnesium alloys. It was found that this effect is further improved by the combined use with calcium. The improvement of the effect by this combined use is saturated when the amount of the rare earth element added is 4% by weight.
Considering the cost, there is no merit in adding rare earth elements in excess of 4% by weight.
【００１５】[0015]
【実施例】 実施例１〜１０及び比較例１〜３ アルゴン雰囲気の真空溶解炉に、表１に示す組成の合金
となるように原材料を装入し、溶解させた。坩堝として
ＳＵＳ３０４材を使用し、フラックス等は使用しなかっ
た。その溶湯を２５mm×５０mm×３００mmの金型中に鋳
込んで試験用鋳物を作成した。このようにして得た試験
用鋳物からＪＩＳ４号試験片を作成した。なお、熱処理
はいずれも５００Ｋ、１０時間である。これらの試験片
を用いて以下の試験を実施した： 引張試験：インストロン引張試験機によりクロスヘッド
速度１０mm/min、測定温度２９８Ｋ及び４７３Ｋ、引張
強度の測定単位＝ＭＰａ、破断時伸び＝％で測定。 測定結果は表１に示す通りであった（表中の％は破断時
伸びである）。A vacuum melting furnace of EXAMPLE 1-10 and Comparative Examples 1 to 3 an argon atmosphere, the way raw wood charge the alloys having compositions shown in Table 1 and charging and dissolved. SUS304 material was used as the crucible, and no flux or the like was used. The molten metal was cast into a mold of 25 mm × 50 mm × 300 mm to prepare a test casting. A JIS No. 4 test piece was prepared from the test casting thus obtained. The heat treatment is 500K for 10 hours. The following tests were carried out using these test pieces: Tensile test: Crosshead speed 10 mm / min, measuring temperature 298K and 473K, measuring unit of tensile strength = MPa, elongation at break =% by Instron tensile tester Measurement. The measurement results were as shown in Table 1 (% in the table is elongation at break).
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【発明の効果】本発明のマグネシウム合金は、従来実用
されている汎用のＭｇ−Ａｌ−Ｚｎ−Ｍｎ系合金よりも
室温及び高温強度に優れており、軽量且つ耐熱性が要求
される自動車エンジン部品に適した汎用の耐熱性軽量マ
グネシウム合金である。INDUSTRIAL APPLICABILITY The magnesium alloy of the present invention is superior in room-temperature and high-temperature strength to the conventionally used general-purpose Mg-Al-Zn-Mn alloys, and is lightweight and heat-resistant automobile engine parts. It is a general-purpose heat-resistant lightweight magnesium alloy suitable for.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 二宮 隆二 埼玉県上尾市原市1333−２ 三井金属鉱業 株式会社総合研究所内 (72)発明者 久保田 耕平 埼玉県上尾市原市1333−２ 三井金属鉱業 株式会社総合研究所内 (72)発明者 ギュンター ナイテ ドイツ連邦共和国 Ｄ−6350 バッド ナ ウハイム マイヌスストラッセ ９ (72)発明者 エバハード イー シュミット ドイツ連邦共和国 Ｄ−8755 アルゼナウ アイ ウンターフランクフルト イグラ ウワー ストラッセ ２Ｅ ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuji Ninomiya 1333-2 Hara-shi, Ageo-shi, Saitama Mitsui Mining & Smelting Co., Ltd. (72) Kohei Kubota 1333-2 Hara-shi, Ageo-shi, Saitama Mitsui Mining & Smelting Co., Ltd. Research Institute (72) Inventor Günter Naite Germany Federal Republic of Germany D-6350 Bad Nauheim Mainus Strasse 9 (72) Inventor Eberhard Eschmidt Federal Republic of Germany D-8755 Arsenau Eye Unter Frankfurt Iglauer Strasse 2E
Claims (2)
ウム１．４〜１０重量％を含有し、Ｃａ／Ａｌの比が
０．７以上であり、残部がマグネシウムと不可避の不純
物からなることを特徴とする室温及び高温強度に優れた
マグネシウム合金。1. An aluminum alloy containing 2 to 10% by weight of aluminum and 1.4 to 10% by weight of calcium, a Ca / Al ratio of 0.7 or more, and the balance being magnesium and inevitable impurities. A magnesium alloy with excellent room temperature and high temperature strength.
ウム１．４〜１０重量％を含有し、Ｃａ／Ａｌの比が
０．７以上であり、更にそれぞれ２重量％以下の亜鉛、
マンガン、ジルコニウム及びケイ素、及び４重量％以下
の希土類元素からなる群から選ばれた少なくとも１種の
元素を含有し、残部がマグネシウムと不可避の不純物か
らなることを特徴とする室温及び高温強度に優れたマグ
ネシウム合金。2. Zinc containing 2 to 10% by weight of aluminum and 1.4 to 10% by weight of calcium, and having a Ca / Al ratio of 0.7 or more and further 2% by weight or less, respectively.
Excellent at room temperature and high temperature strength characterized by containing at least one element selected from the group consisting of manganese, zirconium and silicon, and 4% by weight or less of a rare earth element, and the balance being magnesium and inevitable impurities. Magnesium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4097321A JP2741642B2 (en) | 1992-03-25 | 1992-03-25 | High strength magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4097321A JP2741642B2 (en) | 1992-03-25 | 1992-03-25 | High strength magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0625790A true JPH0625790A (en) | 1994-02-01 |
| JP2741642B2 JP2741642B2 (en) | 1998-04-22 |
Family
ID=14189221
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4097321A Expired - Fee Related JP2741642B2 (en) | 1992-03-25 | 1992-03-25 | High strength magnesium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2741642B2 (en) |
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| JPH0748646A (en) * | 1993-03-15 | 1995-02-21 | Toyota Motor Corp | High strength magnesium base alloy and production thereof |
| JPH07278717A (en) * | 1994-04-12 | 1995-10-24 | Ube Ind Ltd | Magnesium alloy member excellent in settling resistance in pressurized part |
| JPH07331375A (en) * | 1994-06-06 | 1995-12-19 | Toyota Motor Corp | Heat resistant magnesium alloy for casting |
| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| JPH08269609A (en) * | 1995-03-27 | 1996-10-15 | Toyota Central Res & Dev Lab Inc | Mg-al-ca alloy excellent in die castability |
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| US6846451B2 (en) | 2001-08-23 | 2005-01-25 | The Japan Steel Works, Ltd. | Magnesium alloy and magnesium alloy member superior in corrosion resistance |
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| JPH07331375A (en) * | 1994-06-06 | 1995-12-19 | Toyota Motor Corp | Heat resistant magnesium alloy for casting |
| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| JPH08269609A (en) * | 1995-03-27 | 1996-10-15 | Toyota Central Res & Dev Lab Inc | Mg-al-ca alloy excellent in die castability |
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| EP1060817A1 (en) * | 1999-06-04 | 2000-12-20 | Mitsui Mining and Smelting Co., Ltd | Pressure die-casting process of magnesium alloys |
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