JP4092138B2 - Al-Mg alloy for casting - Google Patents
Al-Mg alloy for casting Download PDFInfo
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- JP4092138B2 JP4092138B2 JP2002157329A JP2002157329A JP4092138B2 JP 4092138 B2 JP4092138 B2 JP 4092138B2 JP 2002157329 A JP2002157329 A JP 2002157329A JP 2002157329 A JP2002157329 A JP 2002157329A JP 4092138 B2 JP4092138 B2 JP 4092138B2
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Description
【０００１】
【発明の属する技術分野】
本発明は鋳造用Ａｌ−Ｍｇ系合金に関する。
【０００２】
【従来の技術】
高靱性を要求される大型薄肉鋳物，例えば自動車用ドアパネル等を鋳造，特にダイカスト法により鋳造する場合，その鋳造材料としては，優れた靱性を有するＡｌ−Ｍｇ系合金が用いられる。この場合，結晶粒の微細化を促進して靱性をさらに向上すべく，ＴｉおよびＺｒの少なくとも一方を添加したＡｌ−Ｍｇ系合金も知られている。
【０００３】
【発明が解決しようとする課題】
大型薄肉鋳物をダイカスト法により鋳造する場合，溶湯の流動性維持の観点から注湯温度（液相線温度＋過熱温度）は高い方が良いが，Ａｌ−Ｍｇ系合金組成の溶湯においてはその注湯温度Ｔを高く設定すると，Ｍｇの酸化等に起因して溶湯中のＭｇ濃度の減少が激しくなり，また溶湯の金型への焼付きが発生し易くなる，といった問題を生じる。そのため注湯温度Ｔは，例えば，７２０℃≦Ｔ≦７３０℃に設定される。
【０００４】
一方，ＴｉおよびＺｒによる結晶粒の微細化はそれらの添加量が大である方が有効であるが，それらを徒に増大させても，前記注湯温度Ｔ下ではＴｉ等が飽和してＡｌ3 Ｔｉ，Ａｌ3 Ｚｒといった晶出物の沈殿を招来することになる。
【０００５】
【課題を解決するための手段】
本発明は，特に，ＴｉおよびＺｒの添加量の和Ｔｉ＋ＺｒならびにＴｉおよびＺｒの添加量の比Ｔｉ／Ｚｒを特定することによって，靱性をより一層向上させた前記鋳造用Ａｌ−Ｍｇ系合金を提供することを目的とする。
【０００６】
前記目的を達成するため本発明によれば，３．５ｗｔ％≦Ｍｇ≦４．５ｗｔ％，０．８ｗｔ％≦Ｍｎ≦１．５ｗｔ％，Ｓｉ＜０．５ｗｔ％，Ｆｅ＜０．５ｗｔ％，ＴｉおよびＺｒの添加量の和Ｔｉ＋ＺｒがＴｉ＋Ｚｒ≧０．３ｗｔ％，ＴｉおよびＺｒの添加量の比Ｔｉ／Ｚｒが０．３≦Ｔｉ／Ｚｒ≦２，ならびに残部がＡｌである，鋳造用Ａｌ−Ｍｇ系合金が提供される。
【０００７】
前記のように，ＴｉおよびＺｒの添加量の和Ｔｉ＋ＺｒならびにＴｉおよびＺｒの添加量の比Ｔｉ／Ｚｒを特定すると，前記のような注湯温度下において，ＴｉおよびＺｒの全量を結晶の微細化に寄与させてＡｌ−Ｍｇ系合金の高靱性化を図り，また晶出物の沈殿といった不具合を回避することができる。
【０００８】
各化学成分の添加理由，添加量限定理由等は次の通りである。
【０００９】
Ｍｇ：Ｍｇは鋳物の強度および靱性の向上に寄与する。ただし，Ｍｇ＜３．５ｗｔ％では溶湯の流動性が悪化し，一方，Ｍｇ＞４．５ｗｔ％では鋳物の靱性が低下し，また凝固が遅れた部分にＡｌ−Ｍｇ共晶金属間化合物が偏析して鋳造割れを招来する。
【００１０】
Ｍｎ：この合金は，鋳物の靱性確保のためＦｅ含有量を低く設定しており，また比較的融点が高いため，金型に対して焼付きを生じ易い。Ｍｎは耐焼付き性向上元素として寄与し，大型薄肉鋳物の高速充填鋳造にとって不可欠の元素である。またＭｎは強度向上元素でもある。ただし，Ｍｎ＜０．８ｗｔ％では合金の耐焼付き性が低下し，一方，Ｍｎ＞１．５ｗｔ％では鋳物の強度は向上するものの，その靱性が低下し，また溶湯の流動性も悪化する。
【００１１】
Ｓｉ：Ｓｉは鋳物の強度向上に寄与するが，Ｓｉ≧０．５ｗｔ％ではＭｇ2 Ｓｉ金属間化合物が増加するため鋳物の靱性が低下する。
【００１２】
Ｆｅ：Ｆｅは鋳物の強度向上に寄与するが，Ｆｅ≧０．５ｗｔ％ではＦｅ系晶出物が生成されるため鋳物の靱性が低下する。
【００１３】
ＴｉおよびＺｒ：ＴｉおよびＺｒは，鋳物の結晶粒の微細化による靱性の向上，鋳造割れの防止，溶湯の流動性向上に寄与する。ただし，Ｔｉ＋Ｚｒ＜０．３ｗｔ％では鋳物の靱性向上効果が不十分となる。またＴｉ／Ｚｒ＜０．３およびＴｉ／Ｚｒ＞２では，それぞれ鋳物の靱性が低下する。
【００１４】
【発明の実施の形態】
表１は，鋳造用Ａｌ−Ｍｇ系合金の例１〜１３に関する組成を示す。これら例１〜１３は，添加元素のうち，Ｍｇ，Ｍｎ，ＳｉおよびＦｅの添加量をそれぞれ固定し，ＴｉおよびＺｒの添加量をそれぞれ変更したものである。
【００１５】
【表１】
例１〜１３の組成を有する溶湯を用い，また金型を真空ダイカスト装置に設置して，キャビティ内真空度：６ｋＰａ；金型温度：２００℃；セラミック製断熱スリーブ温度：２００℃；注湯温度：７２０℃；低速射出：０．５ｍ／sec ；高速射出：３ｍ／sec （ゲートスピード換算：４０ｍ／sec ）の条件で鋳造を行い，全体の肉厚が２mm（最小肉厚でもある），縦が約３００mm，横が約１００mmの大型薄肉鋳物を鋳造した。この場合，金型のキャビティ内における溶湯の最大流動距離ｄはｄ≒３００mmである。 各大型薄肉鋳物よりテストピースを製作し，それらテストピースについてα相の平均粒径，伸びおよび引張強さを測定した。ここで，１３種のテストピースを便宜上，Ａｌ−Ｍｇ系合金の例１〜１３とすると，表２は例１〜１３に関するＴｉおよびＺｒの添加量の和Ｔｉ＋Ｚｒ，ＴｉおよびＺｒの添加量の比Ｔｉ／Ｚｒ，α相の平均粒径，伸びおよび引張強さを示す。
【００１７】
【表２】
図１は，表２に基づいて，Ｔｉ／Ｚｒと伸びとの関係を，Ｔｉ＋Ｚｒを異にするものごとに分けてグラフ化したものである。図１から明らかなように，Ａｌ−Ｍｇ系合金において，Ｍｇ，Ｍｎ，ＳｉおよびＦｅの添加量を特定すると共に，ＴｉおよびＺｒの添加量の和Ｔｉ＋ＺｒをＴｉ＋Ｚｒ≧０．３ｗｔ％に，またＴｉおよびＺｒの添加量の比Ｔｉ／Ｚｒを０．３≦Ｔｉ／Ｚｒ≦２にそれぞれ設定すると，例７〜１０，１２，１３のごとく高い伸び，したがって優れた靱性を確保することが可能である。
【００１９】
本発明に係る鋳造用Ａｌ−Ｍｇ系合金の注湯温度Ｔは７２０℃≦Ｔ≦７３０℃が適当であり，また，その合金は，最小肉厚ｔが１．２mm≦ｔ≦３mmであると共に金型のキャビティ内における溶湯の最大流動距離ｄがｄ≧２００mmである大型薄肉鋳物用鋳造材料として好適である。
【００２０】
【発明の効果】
本発明によれば，前記のように構成することによって，優れた靱性を有する鋳造用Ａｌ−Ｍｇ系合金を提供することができ，この合金は，高靱性を要求される大型薄肉鋳物用鋳造材料として好適である。
【図面の簡単な説明】
【図１】Ｔｉ／Ｚｒと伸びとの関係を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an Al—Mg alloy for casting.
[0002]
[Prior art]
When casting a large-sized thin casting requiring high toughness, for example, a door panel for automobiles, particularly by die casting, an Al—Mg alloy having excellent toughness is used as the casting material. In this case, an Al—Mg alloy to which at least one of Ti and Zr is added is also known in order to promote the refinement of crystal grains and further improve the toughness.
[0003]
[Problems to be solved by the invention]
When casting large thin castings by the die casting method, the pouring temperature (liquidus temperature + superheating temperature) is better from the viewpoint of maintaining the fluidity of the molten metal. When the molten metal temperature T is set high, there arises a problem that the Mg concentration in the molten metal is drastically decreased due to oxidation of Mg or the like, and seizure of the molten metal to the mold tends to occur. Therefore, the pouring temperature T is set to 720 ° C. ≦ T ≦ 730 ° C., for example.
[0004]
On the other hand, the refinement of crystal grains with Ti and Zr is more effective when the amount of addition is large. However, even if they are increased, Ti and the like are saturated at the pouring temperature T, and Al is saturated. This causes precipitation of crystallized substances such as 3 Ti and Al 3 Zr.
[0005]
[Means for Solving the Problems]
In particular, the present invention provides the Al-Mg alloy for casting with improved toughness by specifying the sum Ti + Zr of the addition amount of Ti and Zr and the ratio Ti / Zr of the addition amount of Ti and Zr. The purpose is to do.
[0006]
In order to achieve the above object, according to the present invention, 3.5 wt% ≦ Mg ≦ 4.5 wt%, 0.8 wt% ≦ Mn ≦ 1.5 wt%, Si <0.5 wt%, Fe <0.5 wt%, The sum of the addition amount of Ti and Zr, Ti + Zr is Ti + Zr ≧ 0.3 wt%, the ratio of the addition amount of Ti and Zr, Ti / Zr is 0.3 ≦ Ti / Zr ≦ 2, and the balance is Al— An Mg-based alloy is provided.
[0007]
As described above, the sum of Ti and Zr addition amounts Ti + Zr and the ratio of Ti and Zr addition amounts, Ti / Zr, are specified, and the total amount of Ti and Zr is refined at the pouring temperature as described above. This makes it possible to increase the toughness of the Al—Mg alloy and to avoid problems such as precipitation of crystallized substances.
[0008]
The reason for adding each chemical component and the reason for limiting the amount added are as follows.
[0009]
Mg: Mg contributes to the improvement of the strength and toughness of the casting. However, when Mg <3.5 wt%, the fluidity of the molten metal deteriorates, while when Mg> 4.5 wt%, the toughness of the casting deteriorates and Al—Mg eutectic intermetallic compound segregates in the part where solidification is delayed. This causes casting cracks.
[0010]
Mn: This alloy has a low Fe content in order to ensure the toughness of the casting, and has a relatively high melting point, so it tends to seize the mold. Mn contributes as an element for improving seizure resistance and is an indispensable element for high-speed filling casting of large thin castings. Mn is also a strength improving element. However, if Mn <0.8 wt%, the seizure resistance of the alloy is reduced, whereas if Mn> 1.5 wt%, the strength of the casting is improved, but the toughness is reduced, and the fluidity of the molten metal is also deteriorated.
[0011]
Si: Si contributes to improving the strength of the casting. However, if Si ≧ 0.5 wt%, the toughness of the casting is reduced because the Mg 2 Si intermetallic compound increases.
[0012]
Fe: Fe contributes to improving the strength of the casting, but if Fe ≧ 0.5 wt%, the Fe-based crystallized product is generated, and the toughness of the casting is lowered.
[0013]
Ti and Zr: Ti and Zr contribute to improvement of toughness, refinement of casting cracks and improvement of fluidity of the molten metal by refining the crystal grains of the casting. However, when Ti + Zr <0.3 wt%, the effect of improving the toughness of the casting is insufficient. Further, when Ti / Zr <0.3 and Ti / Zr> 2, the toughness of the casting is lowered.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Table 1 shows the compositions for Examples 1 to 13 of casting Al-Mg alloys. In these Examples 1 to 13, among the additive elements, the addition amounts of Mg, Mn, Si and Fe are fixed, and the addition amounts of Ti and Zr are respectively changed.
[0015]
[Table 1]
The molten metal having the composition of Examples 1 to 13 was used, and the mold was placed in a vacuum die casting apparatus. The degree of vacuum in the cavity: 6 kPa; Mold temperature : 200 ° C . ; Ceramic insulation sleeve temperature: 200 ° C .; : 720 ° C; low-speed injection: 0.5 m / sec; high-speed injection: 3 m / sec (gate speed conversion: 40 m / sec), casting is performed with a total wall thickness of 2 mm (also the minimum wall thickness), Cast a large thin-walled casting with a width of about 300 mm and a width of about 100 mm. In this case, the maximum flow distance d of the molten metal in the mold cavity is d≈300 mm. Test pieces were produced from each large thin cast product, and the average particle size, elongation and tensile strength of the α phase were measured for these test pieces. Here, for convenience of the 13 types of test pieces, examples 1 to 13 of Al—Mg alloys are shown. Table 2 shows the sum of the addition amounts of Ti and Zr related to Examples 1 to 13 and the ratio of the addition amounts of Ti and Zr, Ti and Zr. The average particle diameter, elongation and tensile strength of Ti / Zr, α phase are shown.
[0017]
[Table 2]
FIG. 1 is a graph showing the relationship between Ti / Zr and elongation according to Table 2, with Ti + Zr being different. As apparent from FIG. 1, in the Al-Mg alloy, the addition amount of Mg, Mn, Si and Fe is specified, the sum of the addition amounts of Ti and Zr, Ti + Zr, is set to Ti + Zr ≧ 0.3 wt%, and Ti When the ratio Ti / Zr of the addition amount of Zr and Zr is set to 0.3 ≦ Ti / Zr ≦ 2, respectively, it is possible to ensure high elongation as in Examples 7 to 10, 12, and 13, and thus excellent toughness. .
[0019]
The casting temperature T of the casting Al—Mg alloy according to the present invention is suitably 720 ° C. ≦ T ≦ 730 ° C., and the alloy has a minimum wall thickness t of 1.2 mm ≦ t ≦ 3 mm. It is suitable as a casting material for large thin castings in which the maximum flow distance d of the molten metal in the mold cavity is d ≧ 200 mm.
[0020]
【The invention's effect】
According to the present invention, it is possible to provide a casting Al-Mg-based alloy having excellent toughness by configuring as described above, and this alloy is a casting material for large-sized thin-walled castings that requires high toughness. It is suitable as.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between Ti / Zr and elongation.
Claims (3)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002157329A JP4092138B2 (en) | 2002-05-30 | 2002-05-30 | Al-Mg alloy for casting |
| AU2003235302A AU2003235302A1 (en) | 2002-05-30 | 2003-05-14 | Die casting having high toughness |
| US10/518,151 US7713470B2 (en) | 2002-05-30 | 2003-05-14 | Die casting having high toughness |
| EP03723374A EP1508627B1 (en) | 2002-05-30 | 2003-05-14 | High toughness die-cast product |
| PCT/JP2003/005993 WO2003102257A1 (en) | 2002-05-30 | 2003-05-14 | Die casting having high toughness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002157329A JP4092138B2 (en) | 2002-05-30 | 2002-05-30 | Al-Mg alloy for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003342664A JP2003342664A (en) | 2003-12-03 |
| JP4092138B2 true JP4092138B2 (en) | 2008-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002157329A Expired - Fee Related JP4092138B2 (en) | 2002-05-30 | 2002-05-30 | Al-Mg alloy for casting |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004162140A (en) * | 2002-11-14 | 2004-06-10 | Toyota Motor Corp | Al-Mg ALLOY FOR DIE CASTING AND METHOD FOR MANUFACTURING DIE-CAST PRODUCT MADE FROM Al-Mg ALLOY |
| WO2016132549A1 (en) | 2015-02-20 | 2016-08-25 | 新日鐵住金株式会社 | Hot-rolled steel sheet |
| JP7096690B2 (en) * | 2018-03-29 | 2022-07-06 | 株式会社豊田中央研究所 | Aluminum alloys for die casting and aluminum alloy castings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0613303Y2 (en) * | 1987-10-27 | 1994-04-06 | 松下電工株式会社 | Eaves gutter mounting structure |
| JPH06330202A (en) * | 1993-05-17 | 1994-11-29 | Toyota Central Res & Dev Lab Inc | Production of aluminum alloy member high in strength and excellent in toughness and aluminum alloy for casting |
| EP0892077A1 (en) * | 1997-07-18 | 1999-01-20 | Aluminum Company Of America | Cast aluminium alloy and components produced thereof |
| JPH11293375A (en) * | 1998-04-14 | 1999-10-26 | Hitachi Metals Ltd | Aluminum alloy die casting with high toughness and its production |
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