JP3254848B2 - Magnesium alloy for pressure casting with low crack sensitivity - Google Patents
Magnesium alloy for pressure casting with low crack sensitivityInfo
- Publication number
- JP3254848B2 JP3254848B2 JP25186893A JP25186893A JP3254848B2 JP 3254848 B2 JP3254848 B2 JP 3254848B2 JP 25186893 A JP25186893 A JP 25186893A JP 25186893 A JP25186893 A JP 25186893A JP 3254848 B2 JP3254848 B2 JP 3254848B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- casting
- magnesium alloy
- pressure casting
- alloy
- 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.)
- Expired - Fee Related
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- Powder Metallurgy (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ダイカスト、スクイズ
キャスト等の加圧鋳造において使用される加圧鋳造用マ
グネシウム合金に係り、熱間割れが小さく機械的性質が
優れる割れ感受性の小さい加圧鋳造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 magnesium alloy for pressure casting used in pressure casting such as die casting and squeeze casting, and more particularly to pressure casting with low hot cracking and excellent mechanical properties and low crack susceptibility. Related to magnesium alloys.
【０００２】[0002]
【従来の技術】従来、ダイカスト用やスクイズキャスト
用のマグネシウム合金として、熱間割れの低減およびク
リープ強度の改善を目的として硅素（Ｓｉ）含有量を
１．５％以下添加することがあった。また、アルミニウ
ム（Ａｌ）を９重量％含有するＪＩＳ・ＭＣ２合金（Ａ
Ｚ９１）は、割れ感受性が小さく鋳造性に優れたマグネ
シウム合金として知られている。また、マグネシウム合
金にストロンチウム（Ｓｒ）を添加することで、合金組
織の結晶粒が微細化して引け性が改善され、機械的性質
が向上するという報告も有る。2. Description of the Related Art Conventionally, as a magnesium alloy for die casting or squeeze casting, a silicon (Si) content of 1.5% or less has been added for the purpose of reducing hot cracking and improving creep strength. Also, a JIS MC2 alloy (A) containing 9% by weight of aluminum (Al)
Z91) is known as a magnesium alloy having low crack sensitivity and excellent castability. There is also a report that by adding strontium (Sr) to a magnesium alloy, crystal grains of an alloy structure are refined, shrinkage is improved, and mechanical properties are improved.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、Ｓｉの
添加だけでは、冷却速度が遅い部分を含む肉厚変動の大
きい製品の場合、共晶Ｍｇ−Ｓｉ化合物が粗大に晶出
し、機械的性質が低下するという問題がある。一方、Ａ
ｌを９重量％以上含む合金の場合、重力鋳造では割れは
ほとんど発生しないが、加圧鋳造においては、割れが発
生しやすい。Ｓｒのみの添加でも、結晶粒が微細化し割
れは抑制されるが、加圧鋳造の場合にはそれでも不十分
であり、依然割れが多数発生する。However, in the case of a product having a large variation in wall thickness including a portion where the cooling rate is low, the eutectic Mg-Si compound is coarsely crystallized by adding only Si, and the mechanical properties are deteriorated. There is a problem of doing. On the other hand, A
In the case of an alloy containing 1% by weight or more, cracks hardly occur in gravity casting, but cracks easily occur in pressure casting. Although the addition of Sr alone makes the crystal grains fine and suppresses cracking, it is still insufficient in the case of pressure casting, and many cracks still occur.
【０００４】[0004]
【課題を解決するための手段】以上のような課題を解決
して、熱間割れ感受性が小さい加圧鋳造用マグネシウム
合金を得るために、本発明における第１の発明において
は、ダイカスト、スクイズキャスト等の加圧鋳造におい
て使用される加圧鋳造用マグネシウム合金であって、ア
ルミニウムを６〜１２重量％、珪素を０．１〜１．５重
量％、ストロンチウムを０．００５〜０．１重量％含有
し、残部がマグネシウムからなる構成とした。また、第
１の発明を主体とする第２の発明においては、０．２重
量％以下のＭｎ、０．００１重量％以下のＢｅ、０．３
〜４．０重量％のＺｎの不純物を添加した構成にした。In order to solve the above-mentioned problems and to obtain a magnesium alloy for pressure casting with low hot cracking susceptibility, the first invention of the present invention is directed to die casting and squeeze casting. A magnesium alloy for pressure casting used in pressure casting, such as aluminum, 6 to 12% by weight of aluminum, 0.1 to 1.5% by weight of silicon, and 0.005 to 0.1% by weight of strontium. Contained, the balance being made of magnesium. Further, in the second invention mainly based on the first invention, 0.2% by weight or less of Mn, 0.001% by weight or less of Be, 0.3% by weight or less.
構成 4.0 wt% Zn impurity was added.
【０００５】[0005]
【作用】本発明の加圧鋳造用マグネシウム合金は、上に
述べた組成となっており、熱間割れを少なくし、かつ、
機械的性質に悪影響が出ないように、Ａｌを６〜１２重
量％にするとともに、熱間割れ、クリープ強度の改善を
目的としてＳｉを０．１〜１．５重量％添加する。ま
た、ＳｒはＳｉと共存することにより著しく割れの発生
を抑える性質があり、０．００５〜０．１重量％加え
た。以上のようにして、本発明の加圧鋳造用マグネシウ
ム合金は加圧鋳造において熱間割れが小さく、機械的性
質が優れた材料を提供する。The magnesium alloy for pressure casting of the present invention has the composition described above, reduces hot cracking, and
In order not to adversely affect the mechanical properties, the content of Al is set to 6 to 12% by weight, and 0.1 to 1.5% by weight of Si is added for the purpose of improving hot cracking and creep strength. Sr has the property of significantly suppressing the occurrence of cracks when coexisting with Si, and was added in an amount of 0.005 to 0.1% by weight. As described above, the magnesium alloy for pressure casting according to the present invention provides a material having small hot cracking and excellent mechanical properties in pressure casting.
【０００６】[0006]
【実施例】以下図面やデータに基づいて本発明の実施例
の詳細について説明する。図１は熱間割れについて本発
明の材料を比較例（従来の材料）と比較して測定するた
めに用いた階段状平板の製品形状を示す形状寸法図であ
り、複数の段差を持った階段状平板の段差Ｒ部に発生し
た割れの長さを万能投影機により測定した。表１は、ス
クイズキャスト方で鋳造したＡｌ−Ｚｎ系マグネシウム
合金の組成（重量％）と割れ長さ（ｍｍ）を示したもの
である。鋳造条件は、溶湯保持温度７２０℃、射出速度
０．１ｍ／ｓ、メタル圧力９０ＭＰａである。Embodiments of the present invention will be described below in detail with reference to the drawings and data. FIG. 1 is a shape and dimension diagram showing a product shape of a step-like flat plate used for measuring the material of the present invention in comparison with a comparative example (conventional material) with respect to hot cracking, and shows a staircase having a plurality of steps. The length of the crack generated in the step R portion of the flat plate was measured by a universal projector. Table 1 shows the composition (% by weight) and the crack length (mm) of the Al—Zn-based magnesium alloy cast by the squeeze casting method. The casting conditions are a molten metal holding temperature of 720 ° C., an injection speed of 0.1 m / s, and a metal pressure of 90 MPa.
【０００７】[0007]
【表１】 [Table 1]
【０００８】表１において、条件Ｎｏ．１〜４は本発明
による合金組成であり、割れ長さは７０ｍｍ以下であり
比較例のほぼ半分程度の値で小さい。条件Ｎｏ．５〜１
１は比較例であり、Ｎｏ．５は代表的な鋳造用マグネシ
ウム合金のＡＺ９１合金であるけれども、このような条
件の鋳造では割れが大きく発生している。Ｎｏ．６とＮ
ｏ．７は、ＡＺ９１合金にＳｉのみを添加したもので、
割れ長さはＮｏ．５に比べて確かに小さくなっている
が、本発明と比較すると大であり、効果は小さい。Ｎ
ｏ．８とＮｏ．９はＡＺ９１合金にＳｒのみを添加した
もので、Ｓｉのみを添加したＮｏ．６とＮｏ．７のよう
にＳｉのみを添加した場合に比べて、割れ長さは小さく
はなっているが、本発明に比べると依然として大きい。
Ｎｏ．１０とＮｏ．１１とはＡｌ量が本発明の指定範囲
を越えたものであり、４％ＡｌのＮｏ．１０は割れ長さ
が非常に大であり、１４％ＡｌのＮｏ．１１は割れ長さ
が本発明のものとほぼ同程度となった。In Table 1, condition No. Nos. 1 to 4 are alloy compositions according to the present invention, and the crack length is 70 mm or less, which is about half the value of the comparative example and small. Condition No. 5-1
No. 1 is a comparative example. 5 is a typical magnesium alloy for casting, AZ91 alloy, but the casting under such conditions causes large cracks. No. 6 and N
o. 7 is an AZ91 alloy obtained by adding only Si,
The crack length is no. Although it is certainly smaller than that of No. 5, it is large and the effect is small as compared with the present invention. N
o. 8 and no. No. 9 is an AZ91 alloy in which only Sr is added, and No. 9 in which only Si is added. 6 and no. As compared to the case where only Si is added as in No. 7, the crack length is smaller, but is still larger than in the present invention.
No. 10 and No. No. 11 means that the Al content exceeds the specified range of the present invention, No. 10 has a very large crack length, and 14% Al No. 10 In No. 11, the crack length was almost the same as that of the present invention.
【０００９】次に、表１と同様の方法で鋳造したスクイ
ズキャスト品の１２ｍｍ厚さ部分について、溶体化処理
（Ｔ４処理）を施し、引張試験を実施して機械的性質を
求めた結果を示したものが表２である。Next, the results obtained by subjecting a 12 mm thick portion of a squeeze cast product cast in the same manner as in Table 1 to a solution treatment (T4 treatment) and performing a tensile test to determine mechanical properties are shown. Table 2 shows the results.
【００１０】[0010]
【表２】 [Table 2]
【００１１】表２において、条件Ｎｏ．１２〜１４は本
発明による合金組成であり、条件Ｎｏ．１５〜２０は比
較例である。本発明の合金Ｎｏ．１２は、条件Ｎｏ．１
５に示した従来合金ＡＺ９１合金に比べ、破断伸びは同
等であるが、破断強さは約１割増加しているのがわか
る。ＡＺ９１合金にＳｉのみを添加したＮｏ．１６は破
断強さと破断伸びが劣っており、Ｓｒのみを添加したＮ
ｏ．１７は本発明合金と同等の優れた機械的性質を示
す。また、０％Ｚｎにおいても、ＳｉとＳｒの複合添加
が機械的性質に良い効果を示すことが、本発明合金のＮ
ｏ．１３と比較例Ｎｏ．１８より明らかである。Ｎｏ．
１９とＮｏ．２０はＡｌ量が本発明の範囲を越えた比較
例であり、Ａｌが少ないＮｏ．１９は特に耐力が低く、
Ａｌ量が多いＮｏ．２０は耐力は高いものの破断強さが
低く、破断伸びが非常に小さい。In Table 2, condition No. Nos. 12 to 14 are alloy compositions according to the present invention. 15 to 20 are comparative examples. The alloy No. of the present invention. No. 12 is the condition No. 1
It can be seen that the elongation at break is equal to that of the conventional alloy AZ91 alloy shown in FIG. 5, but the breaking strength is increased by about 10%. No. AZ91 alloy containing only Si was added. No. 16 was inferior in breaking strength and breaking elongation.
o. No. 17 shows excellent mechanical properties equivalent to those of the alloy of the present invention. Further, it was found that the composite addition of Si and Sr shows a good effect on the mechanical properties even at 0% Zn, indicating that the N
o. 13 and Comparative Example No. 13. 18 is clearer. No.
19 and no. No. 20 is a comparative example in which the amount of Al exceeded the range of the present invention, and 19 has particularly low proof stress,
No. 1 with a large amount of Al. 20 has high proof stress but low breaking strength and very small breaking elongation.
【００１２】本発明の加圧鋳造用マグネシウム合金は、
上述したデータに示すように、熱間割れ感受性が小さ
く、しかも製品肉厚に関係なく均一微細な組織を有する
ために機械的性質が優れた鋳造材料である。本発明にお
ける各成分の数値限定理由は下記のとおりである。 （１）Ａｌ含有量 ＳｉやＳｒを添加する前の基本合金の熱間割れ感受性は
小さい方がよい。したがって、Ａｌの含有量が６重量％
以下では非常に熱間割れを起し易く、このためＡｌ量の
下限値は６重量％とした。また、１２重量％を越える
と、熱間割れは減少するがＭｇ−Ａｌ化合物量が多くな
り機械的性質に悪影響を及ぼして機械的性質が低下する
から、Ａｌ量の上限値を１２重量％とした。 （２）Ｓｉ含有量 熱間割れ、クリープ強度の改善を目的として添加するＳ
ｉ量は、１．５重量％以上含有すると粗大な初晶Ｍｇ−
Ｓｉ化合物が晶出し、Ｓｒを添加しても微細化すること
ができない。この結果、引張強さ等の機械的性質に悪影
響を及ぼす。したがって、Ｓｉの含有量は１．５重量％
以下とする。熱間割れの低減効果を主な目的とする場合
は、他の性質に与える影響を少なくするために、０．２
〜０．８重量％とすることが好ましい。 （３）Ｓｒ含有量 ＳｒはＳｉと共存することにより著しく割れの発生を抑
えるとともに、共晶Ｍｇ−Ｓｉ化合物を塊状に変える
が、０．００５重量％未満ではその効果は小さく、０．
１重量％を越えて添加しても、その効果の向上を期待で
きないので、上限値を０．１重量％とする。 以上が各成分の数値限定理由であるが、ここで取り上げ
たマグネシウム合金には、不純物として含まれるＦｅを
固定し、耐食性を向上させるため少量のＭｎを添加して
も良く、また、溶湯燃焼防止のために少量のＢｅを添加
しても良い。なお、本発明の合金には必要に応じて亜鉛
（Ｚｎ）を添加することができる。Ｚｎは耐食性、鋳造
性、引張強度の改善に有効であり、その含有量は０．３
〜４．０重量％の範囲が適当である。The magnesium alloy for pressure casting of the present invention comprises:
As shown in the above-mentioned data, the casting material is low in hot cracking susceptibility and has excellent mechanical properties because it has a uniform fine structure regardless of the product thickness. The reasons for limiting the numerical values of each component in the present invention are as follows. (1) Al content It is better that the base alloy before addition of Si or Sr has a small hot cracking susceptibility. Therefore, the content of Al is 6% by weight.
Below, hot cracking is very likely to occur, and therefore, the lower limit of the Al content is set to 6% by weight. On the other hand, if the content exceeds 12% by weight, hot cracking is reduced, but the amount of Mg-Al compound is increased, adversely affecting mechanical properties and decreasing mechanical properties. Therefore, the upper limit of the amount of Al is set to 12% by weight. did. (2) Si content S added for the purpose of improving hot cracking and creep strength
When the i content is 1.5% by weight or more, coarse primary crystal Mg-
The Si compound crystallizes out and cannot be miniaturized even if Sr is added. As a result, mechanical properties such as tensile strength are adversely affected. Therefore, the content of Si is 1.5% by weight.
The following is assumed. When the main purpose is to reduce the effect of hot cracking, in order to reduce the effect on other properties, 0.2
It is preferably set to about 0.8% by weight. (3) Sr content Sr remarkably suppresses the generation of cracks due to coexistence with Si, and changes the eutectic Mg-Si compound into a lump. However, when the content is less than 0.005% by weight, the effect is small.
If the content exceeds 1% by weight, the effect cannot be expected to be improved, so the upper limit is set to 0.1% by weight. These are the reasons for limiting the numerical values of each component. However, in the magnesium alloys taken up here, a small amount of Mn may be added to fix Fe contained as an impurity and improve corrosion resistance. For this purpose, a small amount of Be may be added. Incidentally, zinc (Zn) can be added to the alloy of the present invention as needed. Zn is effective in improving corrosion resistance, castability, and tensile strength. Its content is 0.3%.
A range of -4.0% by weight is appropriate.
【００１３】[0013]
【発明の効果】以上述べたように、本発明の合金組成を
採用することにより、ダイカスト、スクイズキャスト等
の加圧鋳造において、熱間割れが小さく機械的性質に優
れるマグネシウム鋳造品が得られる。As described above, by employing the alloy composition of the present invention, a magnesium cast product having small hot cracks and excellent mechanical properties can be obtained in pressure casting such as die casting and squeeze casting.
【図１】本発明の加圧鋳造用マグネシウム合金の熱間割
れ特性を測定する供試片の形状寸法図である。FIG. 1 is a diagram showing the shape and dimensions of a test piece for measuring hot cracking characteristics of a magnesium alloy for pressure casting according to the present invention.
１ 供試片 1 Test piece
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−188826（ＪＰ，Ａ) 特開 平４−231435（ＪＰ，Ａ) 特開 平６−297127（ＪＰ，Ａ) 特開 平７−109538（ＪＰ，Ａ) 特開 平６−279889（ＪＰ，Ａ) 米国特許5143564（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 23/00 - 23/06 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-188826 (JP, A) JP-A-4-231435 (JP, A) JP-A-6-297127 (JP, A) JP-A-7- 109538 (JP, A) JP-A-6-279889 (JP, A) US Patent 5,135,564 (US, A) (58) Fields investigated (Int. Cl. 7 , DB name) C22C 23/00-23/06
Claims (2)
鋳造において使用される加圧鋳造用マグネシウム合金で
あって、アルミニウムを６〜１２重量％、珪素を０．１
〜１．５重量％、ストロンチウムを０．００５〜０．１
重量％含有し、残部がマグネシウムからなる割れ感受性
の小さい加圧鋳造用マグネシウム合金。1. A magnesium alloy for pressure casting used in pressure casting such as die casting or squeeze casting, wherein aluminum is 6 to 12% by weight and silicon is 0.1% by weight.
Strontium in an amount of 0.005 to 0.1% by weight.
Magnesium alloy for pressure casting with low cracking susceptibility, containing 10% by weight, with the balance being magnesium.
量％以下のＢｅ、０．３〜４．０重量％のＺｎの不純物
を添加した請求項１記載の割れ感受性の小さい加圧鋳造
用マグネシウム合金。2. Pressurization with low crack susceptibility according to claim 1, further comprising impurities of 0.2% by weight or less of Mn, 0.001% by weight or less of Be, and 0.3 to 4.0% by weight of Zn. Magnesium alloy for casting.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25186893A JP3254848B2 (en) | 1993-10-07 | 1993-10-07 | Magnesium alloy for pressure casting with low crack sensitivity |
| US08/219,355 US5551996A (en) | 1993-03-30 | 1994-03-29 | Si-containing magnesium alloy for casting with melt thereof |
| US08/646,818 US5669990A (en) | 1993-03-30 | 1996-05-21 | Si-containing magnesium alloy for casting with melt thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25186893A JP3254848B2 (en) | 1993-10-07 | 1993-10-07 | Magnesium alloy for pressure casting with low crack sensitivity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07109538A JPH07109538A (en) | 1995-04-25 |
| JP3254848B2 true JP3254848B2 (en) | 2002-02-12 |
Family
ID=17229130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25186893A Expired - Fee Related JP3254848B2 (en) | 1993-03-30 | 1993-10-07 | Magnesium alloy for pressure casting with low crack sensitivity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3254848B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6322644B1 (en) * | 1999-12-15 | 2001-11-27 | Norands, Inc. | Magnesium-based casting alloys having improved elevated temperature performance |
| CN114574720B (en) * | 2022-02-28 | 2023-03-17 | 西安交通大学 | Mg2Si reinforced magnesium-based composite material plate and preparation method thereof |
-
1993
- 1993-10-07 JP JP25186893A patent/JP3254848B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07109538A (en) | 1995-04-25 |
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