JP4939841B2 - Magnesium alloy forged product and manufacturing method thereof - Google Patents
Magnesium alloy forged product and manufacturing method thereof Download PDFInfo
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- JP4939841B2 JP4939841B2 JP2006152572A JP2006152572A JP4939841B2 JP 4939841 B2 JP4939841 B2 JP 4939841B2 JP 2006152572 A JP2006152572 A JP 2006152572A JP 2006152572 A JP2006152572 A JP 2006152572A JP 4939841 B2 JP4939841 B2 JP 4939841B2
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本発明はマグネシウム合金鍛造品及びその製造方法に関し、より詳しくは、本発明はダイカスト鋳造と鍛造とを複合させることで、ダイカスト鋳造の複雑形状の成形性、鍛造の高信頼性、高強度性を同時に実現する複合加工技術に関する。 The present invention relates to a magnesium alloy forged product and a method for producing the same, and more specifically, the present invention combines die casting and forging to form a complex shape of die casting, high reliability of forging, and high strength. It relates to complex processing technology that can be realized simultaneously.
自動車業界においては燃費向上のための軽量化の必要性から軽量材料のニーズが高まり、樹脂材料や軽量金属材料が用いられてきている。しかし、樹脂材料は一般的にリサイクルが困難であるため地球環境保全の点で問題があるのに対して、金属材料は一般的にリサイクルが容易であるため、その用途の拡大が特に期待されている。軽量金属材料のうち最も軽量であるマグネシウム合金はこれまでステアリングホイール、シートベルト、エアバックリテーナーなど内装部品に用いられてきたが、今後はエンジン部品やトランスミッション部品などパワートレイン系の部品への用途拡大が検討されている。内装品については延性に優れたマグネシウム合金ＡＭ５０、ＡＭ６０系合金をダイカスト鋳造で製品化している。一方、これから用途拡大が期待されているパワートレイン系においては、強度と１５０℃前後での耐クリープ性に優れた耐熱性マグネシウム合金のダイカスト鋳造での製品化が始められている。なお、耐熱性マグネシウム合金としてはマグネシウム−アルミニウム系に希土類金属やカルシウムを添加したもの等種々のマグネシウム合金が知られている（例えば、特許文献１参照）。 In the automobile industry, the need for lightweight materials has increased due to the need for weight reduction to improve fuel consumption, and resin materials and lightweight metal materials have been used. However, since resin materials are generally difficult to recycle, there is a problem in terms of global environmental conservation, whereas metal materials are generally easy to recycle, so expansion of their use is particularly expected. Yes. Magnesium alloy, which is the lightest among light metal materials, has been used for interior parts such as steering wheels, seat belts, and air bag retainers. However, in the future, it will be used for powertrain parts such as engine parts and transmission parts. Is being considered. For interior products, magnesium alloys AM50 and AM60 alloys with excellent ductility are commercialized by die casting. On the other hand, in the powertrain system, which is expected to be expanded in the future, commercialization by die casting of a heat-resistant magnesium alloy excellent in strength and creep resistance at around 150 ° C. has been started. In addition, various magnesium alloys, such as what added rare earth metals and calcium to the magnesium-aluminum system, are known as a heat resistant magnesium alloy (for example, refer patent document 1).
先行するアルミニウム部材の用途を見ると、自動車のパワートレイン系部品ではピストン、シリンダヘッド、油圧部品など多くの鍛造品が用いられている。これらはマグネシウム合金ダイカスト製品で対応できない高強度、高信頼性の用途であり、現状ではマグネシウム合金では対応できない。アルミニウムダイカスト製品と比較するとマグネシウムダイカスト製品は強度的には１０％以上低く、アルミニウムダイカスト製品を同一サイズのマグネシウムダイカスト製品で代替することは困難であり、多くの場合、部分的な肉厚アップやリブ追加等の強度確保の対策を必要としている。しかし、これらの対策はマグネシウムダイカスト製品の重量アップに繋がってしまう。そこでマグネシウムダイカスト製品では強度要件を満たせない部位につき強度を向上させる技術が求められている。 Looking at the applications of the preceding aluminum members, many forged products such as pistons, cylinder heads, hydraulic components, etc. are used in automotive powertrain components. These are high-strength and high-reliability applications that cannot be handled by magnesium alloy die-cast products, and currently cannot be handled by magnesium alloys. Compared to aluminum die-cast products, magnesium die-cast products are more than 10% lower in strength, making it difficult to replace aluminum die-cast products with magnesium die-cast products of the same size, often with partial thickness increases and ribs Measures to ensure strength such as addition are required. However, these measures lead to an increase in the weight of the magnesium die cast product. Therefore, there is a demand for a technique for improving the strength of a magnesium die cast product at a site where the strength requirement cannot be satisfied.
アルミニウムダイカスト部材をマグネシウムダイカスト部材に代替した場合には、機械的特性でアルミニウムダイカスト部材より剛性、引張り強さが１０％程度低下すること、特に自動車パワートレイン系部材では、その使用温度環境から耐熱性マグネシウム合金を使用するが、クリープ強度についてはエンジンオイルの温度域（１５０℃近辺）でアルミニウムダイカスト材と同等となっているが、剛性、圧縮強さが相対的に低いために、例えばボルト締結において残存軸力がアルミニウムダイカスト部材より２０％程度低下してしまう。剛性は材料の一時的な物理特性であり、大きく変化させることができないが、強度特性を１０％以上向上させることが課題である。一方、マグネシウム鍛造部材は鍛造用素材が高価であるため自動車産業等において広く使用できる状況ではない。また、汎用マグネシウム合金では標準的な鍛造温度では加工硬化が望めず、アルミニウム鍛造部材のような高強度化が望めない。また、耐熱性マグネシウム合金では鍛造用素材が生産されていない。 When aluminum die-casting members are replaced with magnesium die-casting members, the mechanical properties lower the rigidity and tensile strength by about 10% compared to aluminum die-casting members. In particular, automotive powertrain components are heat resistant from their operating temperature environment. Magnesium alloy is used, but the creep strength is the same as that of aluminum die-cast material in the engine oil temperature range (around 150 ° C), but the rigidity and compressive strength are relatively low. The remaining axial force is reduced by about 20% from the aluminum die cast member. Rigidity is a temporary physical property of the material and cannot be changed greatly, but it is a problem to improve the strength property by 10% or more. On the other hand, forged magnesium members are not in a situation where they can be widely used in the automobile industry and the like because the forging material is expensive. Further, with a general-purpose magnesium alloy, work hardening cannot be expected at a standard forging temperature, and high strength like an aluminum forged member cannot be expected. In addition, forging materials are not produced for heat-resistant magnesium alloys.
本発明はこのような従来技術の有する課題に鑑みて為されたものであり、マグネシウム合金のダイカスト鋳造と鍛造とを複合させることで、ダイカスト鋳造の複雑形状の成形性、鍛造品の高信頼性、高強度性を同時に実現する複合加工技術により安価で高品質な鍛造品の製造方法、該製造方法で得られる鍛造品を提供することを目的としている。 The present invention has been made in view of such problems of the prior art, and by combining the die casting and forging of magnesium alloy, the formability of complex shapes of die casting and the high reliability of forged products. An object of the present invention is to provide a low-cost and high-quality forged product manufacturing method and a forged product obtained by the manufacturing method by a composite processing technology that simultaneously realizes high strength.
本発明者らは上記の目的を達成するために種々検討を重ねた結果、マグネシウム合金のダイカスト鋳造と鍛造加工とを組み合わせた複合加工技術により、マグネシウムダイカスト部品の高強度化が達成されることを見いだし、本発明を完成した。 As a result of various studies to achieve the above-mentioned object, the present inventors have found that the strength of magnesium die-cast parts can be increased by a combined machining technique combining die-casting and forging of a magnesium alloy. As a result, the present invention has been completed.
即ち、本発明のマグネシウム合金鍛造品の製造方法は、マグネシウム合金のダイカスト鋳造素材を２５０〜５５０℃に保持し、金型温度を該ダイカスト鋳造素材の保持温度よりも１０〜５０℃低く維持して部分的に又は全面的に鍛造加工を施して強度を向上させることを特徴とする。 That is, in the method for producing a magnesium alloy forged product according to the present invention, the die casting material of magnesium alloy is maintained at 250 to 550 ° C., and the mold temperature is maintained 10 to 50 ° C. lower than the holding temperature of the die casting material. It is characterized in that the strength is improved by forging partly or entirely.
また、本発明のマグネシウム合金鍛造品は、上記の製造方法により得られるものである。 Moreover, the magnesium alloy forged product of this invention is obtained by said manufacturing method.
本発明においては、マグネシウム合金のダイカスト鋳造と鍛造とを複合させることで、ダイカスト鋳造の複雑形状の成形性、鍛造品の高信頼性、高強度性を同時に実現でき、安価で高品質な鍛造品が得られる。 In the present invention, by combining the die casting and forging of a magnesium alloy, it is possible to simultaneously realize the formability of the complex shape of the die casting, the high reliability of the forged product, and the high strength, and an inexpensive and high quality forged product. Is obtained.
本発明のマグネシウム合金鍛造品の製造方法においては、マグネシウム合金のダイカスト鋳造素材を２５０〜５５０℃に保持し、金型温度を該ダイカスト鋳造素材の保持温度よりも１０〜５０℃低く維持して部分的に又は全面的に鍛造加工を施して強度を向上させるのであるが、その条件を精査した結果、鍛造においてダイカスト鋳造素材の温度を２５０〜５５０℃、望ましくは２５０〜４００℃に保持し、金型温度を該ダイカスト鋳造素材の保持温度よりも１０〜５０℃、望ましくは１０〜３０℃低く保持することによりダイカスト鋳造素材の鍛造が可能であることを見出した。また、鍛造加工の所要圧力は汎用合金で４〜１０ｋｇｆ／ｍｍ2以上である。 In the method for producing a magnesium alloy forged product according to the present invention, the magnesium alloy die casting material is maintained at 250 to 550 ° C., and the mold temperature is maintained at 10 to 50 ° C. lower than the holding temperature of the die casting material. However, as a result of investigating the conditions, the temperature of the die casting material is maintained at 250 to 550 ° C., preferably 250 to 400 ° C. It has been found that the die-casting material can be forged by maintaining the mold temperature at 10 to 50 ° C., preferably 10 to 30 ° C. lower than the holding temperature of the die-casting material. The required pressure for forging is 4 to 10 kgf / mm 2 or more for general-purpose alloys.
ダイカスト部品の部分的な鍛造加工の場合には一般的に大きな鍛圧率は取れないが、ＡＭ５０ダイカスト材で鍛圧率５０％の場合、ダイカスト鋳造素材に比較して引張強さが１０％以上、伸びが２０％以上向上する。 In the case of partial forging of die-cast parts, it is generally impossible to obtain a large forging ratio. However, when the forging ratio is 50% with an AM50 die-casting material, the tensile strength is 10% or more higher than that of the die-casting material. Is improved by 20% or more.
本発明のマグネシウム合金鍛造品の製造方法においては、ダイカスト鋳造と鍛造加工とを連続して行うことができ、その場合にダイカスト鋳造直後に再加熱せずに鍛造加工を施すことがコスト面で好ましい。 In the method for producing a magnesium alloy forged product according to the present invention, die casting and forging can be performed continuously, and in that case, forging is preferably performed without reheating immediately after die casting. .
本発明のマグネシウム合金鍛造品の製造方法においては、種々のマグネシウム合金を用いることができる。耐熱性マグネシウム合金は、その特性上塑性加工性に劣ることが多いが、耐熱性と塑性加工性（伸び値５％以上）を両立させた耐熱性マグネシウム合金として下記のマグネシウム合金を用いることが好ましい。 Various magnesium alloys can be used in the method for producing a magnesium alloy forged product of the present invention. Although the heat-resistant magnesium alloy is often inferior in plastic workability due to its characteristics, it is preferable to use the following magnesium alloy as the heat-resistant magnesium alloy having both heat resistance and plastic workability (elongation value of 5% or more). .
（１）アルミニウム１〜１０質量％、亜鉛０．２〜５質量％、及び銀０．２〜５質量％よりなる群から選ばれた少なくとも一種、
（２）希土類金属０．２〜５質量％、カルシウム０．０２〜５質量％、ストロンチウム０．０２〜５質量％及びケイ素０．２〜５質量％よりなる群から選ばれた少なくとも１種、及び
（３）マンガン１．５質量％以下、ジルコニウム１．５質量％以下よりなる群から選ばれた少なくとも１種
を含み、残部がマグネシウム及び不可避の不純物からなるマグネシウム合金。
(1) At least one selected from the group consisting of 1 to 10% by weight of aluminum, 0.2 to 5% by weight of zinc, and 0.2 to 5% by weight of silver,
(2) at least one selected from the group consisting of rare earth metals 0.2 to 5 mass%, calcium 0.02 to 5 mass%, strontium 0.02 to 5 mass% and silicon 0.2 to 5 mass%, And (3) A magnesium alloy containing at least one selected from the group consisting of 1.5% by mass or less of manganese and 1.5% by mass or less of zirconium, with the balance being magnesium and inevitable impurities.
特開平６−２００３４８号公報には上記の耐熱性マグネシウム合金を含めて種々の耐熱性マグネシウム合金が記載されているが、本発明においてはそれらの耐熱性マグネシウム合金も用いることができる。 Japanese Patent Laid-Open No. 6-200348 describes various heat-resistant magnesium alloys including the above-mentioned heat-resistant magnesium alloys. In the present invention, these heat-resistant magnesium alloys can also be used.
上記の耐熱性マグネシウム合金の鍛造加工の場合には、鍛造加工の所要圧力は１０〜２０ｋｇｆ／ｍｍ2以上となるが、その他の条件については汎用合金の場合とほぼ同じ条件で鍛造が可能であり、 鍛造率５０％で１５０℃での引張強さが１６０ＭＰａ以上の鍛造品が得られる。また、上で述べたボルト締結残存軸力は１５０℃で１０％の向上が得られる。 In the case of forging of the above heat-resistant magnesium alloy, the required pressure for forging is 10 to 20 kgf / mm 2 or more, but forging can be performed under almost the same conditions as in the case of general-purpose alloys. A forged product having a forging rate of 50% and a tensile strength at 150 ° C. of 160 MPa or more is obtained. Further, the bolt fastening residual axial force described above can be improved by 10% at 150 ° C.
本発明で用いるダイカスト鋳造素材を製造するためのダイカスト鋳造法として種々のダイカスト鋳造法を用いることができる。高圧ダイカスト鋳造法は肉厚が制限されることがあるが、スクイズダイカスト鋳造法、低圧（ダイカスト）鋳造法、層流ダイカスト鋳造法などは、ポロシティなど内部欠陥を抑制し、肉厚部材を得るのに適した鋳造法である。本発明で用いるダイカスト鋳造素材を製造するためのダイカスト鋳造法として、例えば、特開２００１−００９５６１号公報に記載されているダイカスト鋳造法を用いることができる。本発明のマグネシウム合金鍛造品の製造方法においては、これらのダイカスト鋳造と鍛造加工とを同期させ、再加熱を行わない連続生産システムとすることが望ましい。 Various die casting methods can be used as the die casting method for producing the die casting material used in the present invention. The wall thickness may be limited in the high pressure die casting method, but the squeeze die casting method, the low pressure (die casting) casting method, the laminar flow die casting method, etc. can suppress internal defects such as porosity and obtain a thick member. It is a casting method suitable for. As a die casting method for producing the die casting material used in the present invention, for example, a die casting method described in JP-A-2001-009561 can be used. In the method for producing a magnesium alloy forged product according to the present invention, it is desirable to synchronize these die-casting and forging processes so as to provide a continuous production system in which reheating is not performed.
以下に、実施例に基づいて本発明を具体的に説明する。
実施例１
下記の合金を用い、下記のダイカスト鋳造条件、下記の鍛造条件で鍛造品を製造した。その結果は下記の通りであった。
・合金：汎用合金ＡＺ９１（Ｍｇ−９Ａｌ−０．７Ｚｎ−０．２Ｍｎ）。
・ダイカスト鋳造条件：
コールドチャンバーダイカスト機３５０Ｔ、二輪用エンジンＡＣＧカバー、
溶湯温度６６０℃（ＳＦ６希釈ガス）、鋳造圧力６００ｋｇｆ／ｍｍ2、充填直後の増 圧４００ ｋｇｆ／ｍｍ2、射出速度４ｍ／秒、キャビティへの充填時間５／１００秒、締結部肉厚１５ｍｍ、金型温度（固定、可動共）１７０℃。
・鍛造条件：
形状はダイカストで成形、締結フランジの締結穴部のφ３０につき設計肉厚５ｍｍに対 して１０ｍｍで成形、プレス鍛造により５ｍｍにして締結穴は鍛造後機械加工、
プレス鍛造機１００Ｔ、鍛造温度３００℃、上下のパンチの温度は２７０℃に設定。
・結果：
割れ等の欠陥の発生なく成形できた。
表面硬さ（ブリネル硬さ）：５００ｋｇ、硬球１０ｍｍ、保持時間３０秒
鋳造後：６５ ⇒ 鍛造加工後：７３。
Hereinafter, the present invention will be specifically described based on examples.
Example 1
Using the following alloys, forged products were produced under the following die casting conditions and the following forging conditions. The results were as follows.
Alloy: General-purpose alloy AZ91 (Mg-9Al-0.7Zn-0.2Mn).
-Die casting conditions:
Cold chamber die casting machine 350T, motorcycle engine ACG cover,
Melt temperature 660 ° C. (SF6 diluent gas), casting pressure 600 kgf / mm 2, pressure increase 400 kgf / mm 2 immediately after filling, the injection speed 4m / sec, filling time 5/100 sec to the cavity, the fastening portion thickness 15 mm, Mold temperature (both fixed and movable) 170 ° C.
・ Forging conditions:
The shape is formed by die-casting, the design thickness is 5mm for φ30 of the fastening hole of the fastening flange, the shape is 5mm by press forging, the fastening hole is machined after forging,
Press forging machine 100T, forging temperature 300 ° C, upper and lower punch temperatures set to 270 ° C.
·result:
Molding was possible without occurrence of defects such as cracks.
Surface hardness (Brinell hardness): 500 kg, hard ball 10 mm, holding time 30 seconds
After casting: 65 ⇒ After forging: 73.
実施例２
下記の合金を用い、下記のダイカスト鋳造条件、下記の鍛造条件で鍛造品を製造した。その結果は下記の通りであった。
・合金：汎用合金ＡＭ５０（Ｍｇ−５Ａｌ−０．２Ｍｎ）。
・ダイカスト鋳造条件：
コールドチャンバーダイカスト機３５０Ｔ、四輪エアバックリテーナー、
溶湯温度６８０℃（ＳＦ６希釈ガス）、鋳造圧力６００ｋｇｆ／ｍｍ2、充填直後の増 圧４００ ｋｇｆ／ｍｍ2、射出速度４ｍ／秒、キャビティへの充填時間３／１００秒、締結部肉厚１５ｍｍ、金型温度（固定、可動共）１８０℃。
・鍛造条件：
形状はダイカストで成形、締結フランジの締結穴部のφ３０につき設計肉厚３ｍｍに対 して６ｍｍで成形、プレス鍛造により３ｍｍにして締結穴は鍛造後機械加工、
プレス鍛造機１００Ｔ、鍛造温度３００℃、上下のパンチの温度は２７０℃に設定。
・結果：
割れ等の欠陥の発生なく成形できた。
表面硬さ（ブリネル硬さ）：５００ｋｇ、硬球１０ｍｍ、保持時間３０秒
鋳造後：５５ ⇒ 鍛造加工後：６２。
Example 2
Using the following alloys, forged products were produced under the following die casting conditions and the following forging conditions. The results were as follows.
Alloy: General purpose alloy AM50 (Mg-5Al-0.2Mn).
-Die casting conditions:
Cold chamber die casting machine 350T, four-wheel air bag retainer,
Melt temperature 680 ° C. (SF6 diluent gas), casting pressure 600 kgf / mm 2, pressure increase 400 kgf / mm 2 immediately after filling, the injection speed 4m / sec, filling time 3/100 sec to the cavity, the fastening portion thickness 15 mm, Mold temperature (both fixed and movable) 180 ° C.
・ Forging conditions:
The shape is formed by die-casting, the diameter of the fastening hole of the fastening flange is 30mm, and the design thickness is 3mm, and the fastening hole is machined after forging.
Press forging machine 100T, forging temperature 300 ° C, upper and lower punch temperatures set to 270 ° C.
·result:
Molding was possible without occurrence of defects such as cracks.
Surface hardness (Brinell hardness): 500 kg, hard ball 10 mm, holding time 30 seconds
After casting: 55 ⇒ After forging: 62.
実施例３〜８
下記のマグネシウム合金を用い、下記に示す条件下で鍛造品を製造した。なお、いずれの場合にも溶解時の溶湯保持雰囲気としてＳＦ６希釈ガスを用い、押出し時のダイスは冷却管にて温度調節し、鍛造時の鍛造温度が４００℃を超える時にもＡｒガスを吹きつけながら行った。得られた鍛造品の特性は第１表に示す通りであった。
（１）Ｍｇ−１０Ａｌ−５ＭＭ−５Ｃａ−０．２Ｍｎ、
（２）Ｍｇ−１０Ａｌ−５ＭＭ−５Ｓｒ−０．５Ｃａ−０．２Ｍｎ
（３）Ｍｇ−７Ａｌ−２．５ＭＭ−２．５Ｃａ−０．５Ｓｒ−０．２Ｍｎ、
（４）Ｍｇ−１Ａｌ−０．２ＭＭ−０．０２Ｃａ−０．８Ｍｎ、
（５）Ｍｇ−５Ｚｎ−２ＭＭ−１．５Ｓｒ−０．８Ｚｒ、
（６）Ｍｇ−０．２Ｚｎ−０．２ＭＭ−０．２Ｃａ−０．６Ｚｒ、
（７）Ｍｇ−１Ｚｎ−５．５Ｙ−２ＭＭ−１．５Ｓｒ−０．５Ｚｒ−０．０２Ｃａ。
・ダイカスト鋳造条件：
コールドチャンバーダイカスト機２５０Ｔ、１５０×１５０×６の試験用板材、
溶湯温度は各合金ごとに第１表に示す温度に設定、鋳造圧力６００ｋｇｆ／ｍｍ2、充 填直後の 増圧４００ｋｇｆ／ｍｍ2、射出速度５ｍ/秒、キャビティへの充填時間２／１００秒、金型温度 （固定、可動共）１８０℃。
・鍛造条件：
プレス鍛造機１００Ｔ、自由鍛造にて展伸鍛伸、３０×３０×６の試験片を３ｍｍ厚に する、鍛造温度、パンチ温度は各合金ごとに第１表に示す温度に設定、３００℃、上下 のパンチの温度は２７０℃に設定。
Examples 3-8
A forged product was produced under the conditions shown below using the following magnesium alloy. In any case, SF6 dilution gas is used as the molten metal holding atmosphere during melting, the temperature of the die during extrusion is adjusted by a cooling pipe, and Ar gas is blown even when the forging temperature during forging exceeds 400 ° C. I went there. The characteristics of the forged product obtained were as shown in Table 1.
(1) Mg-10Al-5MM-5Ca-0.2Mn,
(2) Mg-10Al-5MM-5Sr-0.5Ca-0.2Mn
(3) Mg-7Al-2.5MM-2.5Ca-0.5Sr-0.2Mn,
(4) Mg-1Al-0.2MM-0.02Ca-0.8Mn,
(5) Mg-5Zn-2MM-1.5Sr-0.8Zr,
(6) Mg-0.2Zn-0.2MM-0.2Ca-0.6Zr,
(7) Mg-1Zn-5.5Y-2MM-1.5Sr-0.5Zr-0.02Ca.
-Die casting conditions:
Cold chamber die casting machine 250T, 150 × 150 × 6 test plate,
Molten metal temperature is set to a temperature shown in Table 1 for each alloy, casting pressure 600 kgf / mm 2, pressure increase 400 kgf / mm 2 immediately after Hama charge injection speed 5 m / sec, filling time 2/100 sec to the cavity, Mold temperature (both fixed and movable) 180 ° C.
・ Forging conditions:
Press forging machine 100T, stretch forging by free forging, 30x30x6 test piece is made 3mm thick, forging temperature, punching temperature is set to the temperature shown in Table 1 for each alloy, 300 ° C, The upper and lower punch temperatures are set to 270 ° C.
Claims (7)
（１）アルミニウム１〜１０質量％、亜鉛０．２〜５質量％、及び銀０．２〜５質量％よりなる群から選ばれた少なくとも一種、
（２）希土類金属０．２〜５質量％、カルシウム０．０２〜５質量％、ストロンチウム０．０２〜５質量％及びケイ素０．２〜５質量％よりなる群から選ばれた少なくとも１種、及び
（３）マンガン１．５質量％以下、ジルコニウム１．５質量％以下よりなる群から選ばれた少なくとも１種
を含み、残部がマグネシウム及び不可避の不純物からなるマグネシウム合金であることを特徴とする請求項１、２又は３記載のマグネシウム合金鍛造品の製造方法。 The magnesium alloy is (1) at least one selected from the group consisting of 1 to 10% by weight of aluminum, 0.2 to 5% by weight of zinc, and 0.2 to 5% by weight of silver,
(2) at least one selected from the group consisting of rare earth metals 0.2 to 5 mass%, calcium 0.02 to 5 mass%, strontium 0.02 to 5 mass% and silicon 0.2 to 5 mass%, And (3) a magnesium alloy comprising at least one selected from the group consisting of 1.5% by mass or less of manganese and 1.5% by mass or less of zirconium, with the balance being magnesium and inevitable impurities. The manufacturing method of the magnesium alloy forgings of Claim 1, 2 or 3.
The magnesium alloy forged product according to claim 5 or 6, wherein the tensile strength at 150 ° C is 160 MPa or more.
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