JPH0625788A - Lightweight high-strength magnesium alloy - Google Patents
Lightweight high-strength magnesium alloyInfo
- Publication number
- JPH0625788A JPH0625788A JP9732292A JP9732292A JPH0625788A JP H0625788 A JPH0625788 A JP H0625788A JP 9732292 A JP9732292 A JP 9732292A JP 9732292 A JP9732292 A JP 9732292A JP H0625788 A JPH0625788 A JP H0625788A
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- Prior art keywords
- strength
- weight
- alloy
- magnesium alloy
- yttrium
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は軽量高強度マグネシウム
合金に関し、より詳しくは室温及び高温での高強度及び
強度の安定性を有し、更に加工性の改善された鋳造用及
び加工用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 lightweight and high-strength magnesium alloy, and more particularly to a magnesium alloy for casting and working which has high strength and strength stability at room temperature and high temperature and further has improved workability. Regarding
【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】自動車用軽量材料として注目されているマ
グネシウム合金の中でも、高リチウム含有マグネシウム
合金は特に低密度であり、かつ高いダンピング特性を有
する合金として、従来から航空・宇宙用素材として、ま
た音響用素材として注目されてきた材料である。高リチ
ウム含有マグネシウム合金として現在実用化されている
合金は１９５０年代にバッテル研究所が開発したＬＡ１
４１合金（Ｍｇ−１４Ｌｉ−１Ａｌ系）であり、これま
で航空用部材等の軽量化に活用されてきた。Among magnesium alloys that are attracting attention as lightweight materials for automobiles, magnesium alloys containing a high amount of lithium are particularly low in density and have high damping characteristics. Conventionally, they are materials for aviation and space, and for acoustics. It is a material that has been drawing attention as a material. The alloy currently in practical use as a high-lithium magnesium alloy is LA1 developed by Batter Institute in the 1950s.
It is a No. 41 alloy (Mg-14Li-1Al system), and has been utilized so far for weight reduction of aeronautical members and the like.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ＬＡ１４１合金は高温強度が低く、また室温でも時間経
過に伴って強度劣化を引き起こすという欠点を有するも
のであり、それ故に用途の拡大は困難であったいえる。However, the above-mentioned LA141 alloy has the drawbacks of low strength at high temperature and deterioration of strength over time even at room temperature, and therefore its application is difficult to expand. Can say
【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、従来
の高リチウム含有マグネシウム合金の特徴である低密度
という特性を維持しつつ、室温及び高温での強度の向上
及び強度の安定性を図り、併せて加工特性を更に改善し
た汎用の軽量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 to maintain the characteristic of low density, which is a feature of conventional magnesium alloys having a high lithium content, An object of the present invention is to provide a general-purpose lightweight high-strength magnesium alloy which has improved strength and stability at room temperature and high temperature, and further improved processing characteristics.
【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、高リチウム含
有マグネシウム合金に適量のイットリウムを添加するこ
とにより室温及び高温での強度が向上し、且つ時間経過
による強度の劣化が抑制され、併せて加工特性が改善さ
れることを見出し、本発明に到達した。Means for Solving the Problems As a result of various studies to solve the above problems, the present inventors have found that the strength at room temperature and high temperature can be improved by adding an appropriate amount of yttrium to a high lithium content magnesium alloy. The present invention has been accomplished by finding that the strength is improved and the deterioration of strength due to the passage of time is suppressed, and at the same time, the processing characteristics are improved.
【０００７】即ち、本発明の軽量高強度マグネシウム合
金はリチウム１０．５〜１８重量％及びイットリウム
０．３〜７重量％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。That is, the lightweight high-strength magnesium alloy of the present invention is characterized by containing 10.5 to 18% by weight of lithium and 0.3 to 7% by weight of yttrium, and the balance being magnesium and inevitable impurities.
【０００８】本発明の軽量高強度マグネシウム合金は、
所望により、更に６重量％以下のアルミニウム、６重量
％以下の亜鉛、それぞれ２重量％以下の銀、マンガン及
びランタノイド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。The lightweight and high strength magnesium alloy of the present invention is
If desired, it may further contain 6% by weight or less of aluminum, 6% by weight or less of zinc, and 2% by weight or less of each of at least one element selected from the group consisting of silver, manganese and lanthanoid.
【０００９】リチウムは比重が０．５３であり、リチウ
ム添加量を増加させることにより本発明の軽量高強度マ
グネシウム合金を更に低比重とすることができる。しか
し、リチウムは活性であるので１８重量％を越えて添加
した合金は大気中に放置するだけでも酸化を受易くなる
ので実用合金としては適切でない。また、リチウム添加
量が１０．５重量％未満の場合には合金の比重が１．５
以上となり、軽量化のメリットが低減される上に、Ｍｇ
−Ｌｉ系の共晶組成となり、特性が大きく変化してしま
う。従って、本発明の軽量高強度マグネシウム合金にお
いてはリチウム添加量を１０．５〜１８重量％、好まし
くは１３〜１５重量％とする。Lithium has a specific gravity of 0.53, and by increasing the amount of lithium added, the lightweight high-strength magnesium alloy of the present invention can have a lower specific gravity. However, since lithium is active, an alloy added in excess of 18% by weight is susceptible to oxidation even if left alone in the atmosphere, and is not suitable as a practical alloy. When the amount of lithium added is less than 10.5% by weight, the specific gravity of the alloy is 1.5
As described above, the merit of weight reduction is reduced, and in addition, Mg
A -Li-based eutectic composition is obtained, and the characteristics change greatly. Therefore, in the lightweight high-strength magnesium alloy of the present invention, the amount of lithium added is set to 10.5 to 18% by weight, preferably 13 to 15% by weight.
【００１０】本発明の軽量高強度マグネシウム合金にお
いては、イットリウムはβ相（ＢＣＣ相）に固溶し、合
金を固溶硬化すると共に合金の回復など経時変化を抑制
するので、強度の安定化に寄与する。また微量の金属間
化合物Ｍｇ24Ｙ5 を晶出させた場合には鋳造組織が著し
く微細化するという効果を有し、強度及び加工性を向上
させることができる。イットリウムによる固溶硬化作用
はイットリウムの添加量が０．３重量％以上になったと
きに明確に認めらる。Ｍｇ−１２Ｌｉ合金におけるイッ
トリウムの固溶限度は５重量％であり、これ以上に添加
されていると凝固時に金属間化合物Ｍｇ24Ｙ5 が晶出す
ることになる。上記したように、この晶出が微量の場合
には鋳造組織が著しく微細化するという効果を達成する
ことができるが、イットリウムの添加量が７重量％を越
えると粒界にネットワーク状の組織が形成されて加工性
が損なわれ、且つ合金の比重が増大することになる。従
って、本発明の軽量高強度マグネシウム合金においては
イットリウム添加量を０．３〜７重量％、好ましくは２
〜５重量％とする。In the lightweight, high-strength magnesium alloy of the present invention, yttrium is solid-solved in the β phase (BCC phase), solid-solution hardens the alloy, and suppresses aging such as recovery of the alloy, thus stabilizing the strength. Contribute. Further, when a small amount of the intermetallic compound Mg 24 Y 5 is crystallized, it has an effect of significantly refining the cast structure, and the strength and workability can be improved. The solid solution hardening effect of yttrium is clearly recognized when the amount of yttrium added is 0.3% by weight or more. The solid solution limit of yttrium in the Mg-12Li alloy is 5% by weight, and if it is added more than this, the intermetallic compound Mg 24 Y 5 will crystallize during solidification. As described above, when the amount of crystallization is small, the effect of significantly refining the cast structure can be achieved, but when the amount of yttrium added exceeds 7% by weight, a network-like structure is formed at the grain boundaries. When formed, the workability is impaired and the specific gravity of the alloy is increased. Therefore, in the lightweight high-strength magnesium alloy of the present invention, the amount of yttrium added is 0.3 to 7% by weight, preferably 2%.
Up to 5% by weight.
【００１１】高リチウム含有マグネシウム合金において
は、アルミニウム、亜鉛、銀、マンガン及びランタノイ
ド（例えば、Ｌａ、Ｃｅ、ミッシュメタル等）はいずれ
も合金の強度向上に寄与することが知られており、この
効果はイットリウムとの共存によっても相殺されるもの
ではない。これらの合金元素の添加量の増加と共に合金
の強度が増大するが、アルミニウム及び亜鉛については
６重量％で、また銀、マンガン及びランタノイドについ
ては２重量％で合金強度の増大に対する効果が飽和し、
それ以上添加してもそれ以上の合金強度の増大は認めら
れない。一方、アルミニウム及び亜鉛については６重量
％を越えて、また銀、マンガン及びランタノイドについ
ては２重量％を越えて添加すると、合金は脆くなり、合
金の比重が大きくなり、また加工性も低下することにな
る。従って、本発明の軽量高強度マグネシウム合金にお
いては、アルミニウム及び亜鉛の添加量については６重
量％以下、好ましくは３〜５重量％、また銀、マンガン
及びランタノイドの添加量については２重量％以下、好
ましくは０．５〜１．５重量％とする。In a high lithium content magnesium alloy, aluminum, zinc, silver, manganese and lanthanoids (eg, La, Ce, Misch metal, etc.) are all known to contribute to the strength improvement of the alloy. Is not offset by coexistence with yttrium. The strength of the alloy increases with the increase of the addition amount of these alloying elements, but the effect of increasing the alloy strength is saturated at 6% by weight for aluminum and zinc and 2% by weight for silver, manganese and lanthanoid,
No further increase in alloy strength is observed even if added more. On the other hand, when aluminum and zinc are added in excess of 6% by weight and silver, manganese and lanthanoid in excess of 2% by weight, the alloy becomes brittle, the specific gravity of the alloy becomes large, and the workability also deteriorates. become. Therefore, in the lightweight high-strength magnesium alloy of the present invention, the addition amount of aluminum and zinc is 6% by weight or less, preferably 3 to 5% by weight, and the addition amount of silver, manganese and lanthanoid is 2% by weight or less, It is preferably 0.5 to 1.5% by weight.
【００１２】[0012]
実施例１〜１３及び比較例１〜７ 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
験用鋳物から引張試験用試験片（ＪＩＳ４号試験片）、
硬さ試験用試験片、比重測定用試験片及び加工性評価用
試験片を作成した。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で、鋳造後２９８Ｋで測定（引張強度）
及び３３３Ｋで１週間保持した後に２９８Ｋで測定（時
効後引張強度）、測定単位＝ＭＰａ； 硬さ試験：マイクロビッカース硬さ試験、２９８Ｋ（室
温硬さ）及び４２３Ｋ（高温硬さ）、荷重０．４９Ｎ、
保持時間１０秒； 比重：アルキメデス法； 加工性評価：２９８Ｋでの圧延試験での耳割れまでの圧
下率； 測定結果は表１に示す通りであった。Examples 1 to 13 and Comparative Examples 1 to 7 Raw materials were charged and melted in a vacuum melting furnace in an argon atmosphere so as to form an alloy having the composition shown in Table 1. 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. From the test casting thus obtained, a tensile test specimen (JIS No. 4 test specimen),
A test piece for hardness test, a test piece for measuring specific gravity and a test piece for workability evaluation were prepared. The following tests were carried out using these test pieces: Tensile test: measured with an Instron tensile tester at a crosshead speed of 10 mm / min and at 298 K after casting (tensile strength)
And 333 K for 1 week and then measured at 298 K (tensile strength after aging), measurement unit = MPa; Hardness test: Micro Vickers hardness test, 298 K (room temperature hardness) and 423 K (high temperature hardness), load 0. 49N,
Holding time: 10 seconds; Specific gravity: Archimedes method; Workability evaluation: Rolling reduction rate up to edge cracking in rolling test at 298K; Measurement results are shown in Table 1.
【００１３】[0013]
【表１】 上記の実施例及び比較例のデータから次のことが明らか
である：アルミニウムの添加は合金強度の向上に極めて
有効であるが、時効により合金強度が著しく低下する
（比較例１〜２）；イットリウムの添加はアルミニウム
の添加ほどではないが合金強度の向上に有効であり、特
に注目すべきことはイットリウムを添加した合金は時効
後の合金強度の低下が緩和される（実施例３〜４）；イ
ットリウムの添加はアルミニウムの添加よりも高温硬さ
を向上させる程度が大きい；アルミニウム、亜鉛、銀、
マンガン及びランタノイドの添加はイットリウムの共存
によっても合金強度の向上に寄与し、且つその共存する
イットリウムによって強度の安定性、高温硬さの向上及
び加工性の向上が得られる；イットリウムの添加量が
０．３重量％未満の場合にはその添加効果が不十分であ
る（比較例５）；リチウム添加量が１８重量％を越える
と合金は酸化を受け易くなる（比較例４）；イットリウ
ムやアルミニウムの添加量が過大になると加工性が低下
する（比較例６〜７）。[Table 1] From the data of the above examples and comparative examples it is clear that the addition of aluminum is very effective in improving the alloy strength, but aging significantly reduces the alloy strength (comparative examples 1-2); yttrium. Is effective in improving the alloy strength, though not so much as adding aluminum, and it should be noted that the alloy containing yttrium alleviates the decrease in alloy strength after aging (Examples 3 to 4); The addition of yttrium improves the high temperature hardness to a greater extent than the addition of aluminum; aluminum, zinc, silver,
The addition of manganese and lanthanoid contributes to the improvement of alloy strength even with the coexistence of yttrium, and the coexisting yttrium provides the stability of strength, the improvement of high temperature hardness and the improvement of workability; the addition amount of yttrium is 0. If the amount is less than 0.3% by weight, the effect of addition is insufficient (Comparative Example 5); if the amount of lithium added exceeds 18% by weight, the alloy is susceptible to oxidation (Comparative Example 4); If the amount of addition is too large, the workability decreases (Comparative Examples 6 to 7).
【００１４】[0014]
【発明の効果】本発明の軽量高強度マグネシウム合金
は、従来実用されている高リチウム含有マグネシウム合
金、ＬＡ１４１合金よりも室温及び高温の両方において
高強度で且つ強度の安定性に優れ、加工性も優れた汎用
の軽量高強度合金である。EFFECTS OF THE INVENTION The lightweight and high strength magnesium alloy of the present invention has higher strength and stability of strength at room temperature and higher temperature than the conventional high lithium content magnesium alloy and LA141 alloy, and also has good workability. It is an excellent general purpose lightweight high strength alloy.
【００１５】本発明の軽量高強度マグネシウム合金は、
合金としては最も低比重を達成したものであり、航空・
宇宙関連はもとより、従来以上に自動車の軽量化等に活
用することができる。The lightweight and high strength magnesium alloy of the present invention is
This is the alloy with the lowest specific gravity.
It can be used not only for space-related products but also for making automobiles lighter than before.
───────────────────────────────────────────────────── フロントページの続き (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 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 ギュンター ルドルフ ドイツ連邦共和国 Ｄ−6451 ナウベルグ アルバート シュワイツァー ストラッ セ ５ (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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kohei Kubota 1333-2, Ageo-shi, Saitama Prefecture Mitsui Mining & Smelting Co., Ltd. (72) Inventor Ryuji Ninomiya 1333-2 Ageo-shi, Saitama Mitsui Mining & Smelting Co., Ltd. Research Institute (72) Inventor Gunter Rudolf D-6451 Nauberg Albert Schweitzer Strasse 5 (72) Inventor Gunter Naite Germany D-6350 Bad Nauheim Mainus Strasse 9
Claims (2)
トリウム０．３〜７重量％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軽量高強
度マグネシウム合金。1. A lightweight, high-strength magnesium alloy containing 10.5 to 18% by weight of lithium and 0.3 to 7% by weight of yttrium, and the balance being magnesium and inevitable impurities.
トリウム０．３〜７重量％を含有し、更に６重量％以下
のアルミニウム、６重量％以下の亜鉛、それぞれ２重量
％以下の銀、マンガン及びランタノイドからなる群から
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軽量
高強度マグネシウム合金。2. 10.5 to 18% by weight of lithium and 0.3 to 7% by weight of yttrium, further 6% by weight or less of aluminum, 6% by weight or less of zinc, 2% by weight or less of silver and manganese, respectively. And a lightweight high-strength magnesium alloy containing at least one element selected from the group consisting of lanthanoids and the balance being magnesium and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09732292A JP3261436B2 (en) | 1992-03-25 | 1992-03-25 | Lightweight high strength magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09732292A JP3261436B2 (en) | 1992-03-25 | 1992-03-25 | Lightweight high strength magnesium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0625788A true JPH0625788A (en) | 1994-02-01 |
| JP3261436B2 JP3261436B2 (en) | 2002-03-04 |
Family
ID=14189250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09732292A Expired - Fee Related JP3261436B2 (en) | 1992-03-25 | 1992-03-25 | Lightweight high strength magnesium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3261436B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060336A (en) * | 2018-01-22 | 2018-05-22 | 上海交通大学 | A kind of ultralight high-strength magnesium lithium alloy containing low Y and preparation method thereof |
| JP2020510754A (en) * | 2017-02-24 | 2020-04-09 | イノマック ２１ ソシエダ リミターダ | Economical manufacturing of lightweight components |
| US20220154315A1 (en) * | 2019-02-20 | 2022-05-19 | Husqvarna Ab | A Magnesium Alloy, A Piston Manufactured by Said Magnesium Alloy and a Method for Manufacturing Said Piston |
| CN115323231A (en) * | 2022-08-24 | 2022-11-11 | 常州驰科光电科技有限公司 | Lithium-magnesium alloy for ball top and preparation method thereof |
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|---|---|---|---|---|
| US3189442A (en) * | 1963-05-27 | 1965-06-15 | Paul D Frost | Magnesium-lithium-yttrium alloys |
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| JPH0432535A (en) * | 1990-05-28 | 1992-02-04 | Toyota Motor Corp | High strength and high rigidity magnesium-lithium alloy |
-
1992
- 1992-03-25 JP JP09732292A patent/JP3261436B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3189442A (en) * | 1963-05-27 | 1965-06-15 | Paul D Frost | Magnesium-lithium-yttrium alloys |
| US5059390A (en) * | 1989-06-14 | 1991-10-22 | Aluminum Company Of America | Dual-phase, magnesium-based alloy having improved properties |
| JPH0432535A (en) * | 1990-05-28 | 1992-02-04 | Toyota Motor Corp | High strength and high rigidity magnesium-lithium alloy |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108060336A (en) * | 2018-01-22 | 2018-05-22 | 上海交通大学 | A kind of ultralight high-strength magnesium lithium alloy containing low Y and preparation method thereof |
| US20220154315A1 (en) * | 2019-02-20 | 2022-05-19 | Husqvarna Ab | A Magnesium Alloy, A Piston Manufactured by Said Magnesium Alloy and a Method for Manufacturing Said Piston |
| US11926887B2 (en) * | 2019-02-20 | 2024-03-12 | Husqvarna Ab | Magnesium alloy, a piston manufactured by said magnesium alloy and a method for manufacturing said piston |
| CN115323231A (en) * | 2022-08-24 | 2022-11-11 | 常州驰科光电科技有限公司 | Lithium-magnesium alloy for ball top and preparation method thereof |
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