JPH0794700B2 - Method for manufacturing high strength aluminum alloy extruded material - Google Patents
Method for manufacturing high strength aluminum alloy extruded materialInfo
- Publication number
- JPH0794700B2 JPH0794700B2 JP3038886A JP3888691A JPH0794700B2 JP H0794700 B2 JPH0794700 B2 JP H0794700B2 JP 3038886 A JP3038886 A JP 3038886A JP 3888691 A JP3888691 A JP 3888691A JP H0794700 B2 JPH0794700 B2 JP H0794700B2
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- JP
- Japan
- Prior art keywords
- extrusion
- extruded material
- aluminum alloy
- precipitation treatment
- precipitate
- 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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- Extrusion Of Metal (AREA)
Description
【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、Ｚｎ，Ｍｇ，Ｃｕを含
有するＪＩＳ ７０７５系アルミニウム合金のような難
加工材料の押出加工方法に関し、特に押出速度を高めて
も押出材の表面にテアリング（微小傷）などの欠陥が発
生しないような押出加工方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion processing method for difficult-to-process materials such as JIS 7075 series aluminum alloys containing Zn, Mg, and Cu. The present invention relates to an extrusion processing method in which defects such as minute scratches do not occur.
【０００２】[0002]
【従来の技術】ＪＩＳ ７０７５系アルミニウム合金
は、押出加工を行うと、押出材表面にテアリング（微小
傷）や結晶粒が粗大化する異常組織などの表面欠陥が発
生するので、難加工材料として知られ、押出速度が１ｍ
／ｍｉｎ以下と極めて低く、生産性の悪さが問題となっ
ている。2. Description of the Related Art JIS 7075 aluminum alloy is known as a difficult-to-process material because when it is extruded, surface defects such as tearing (small scratches) and abnormal structures in which crystal grains become coarser occur on the extruded material surface. The extrusion speed is 1m
/ Min or less, which is extremely low, and poor productivity is a problem.
【０００３】[0003]
【発明が解決しようとする課題】最近、航空機部品や自
動車、オ―トバイ部品などは、軽量化が進みアルミニウ
ム合金や炭素繊維などの材料が用いられる量が多くなっ
ている。さらに軽量化を進めようとするには、強度を増
し肉厚を薄くする必要があり、７０７５合金材料の形材
の使用が多くなる。従って、押出加工の速度を上げ生産
性を向上させる必要があった。そこで本発明の目的は、
押出速度を高めても押出材の表面にテアリング（微小
傷）などの欠陥が発生しないような押出加工方法を提案
するものである。Recently, the weight of aircraft parts, automobiles, auto-by parts, and the like has been reduced, and materials such as aluminum alloys and carbon fibers have been used in large amounts. In order to further reduce the weight, it is necessary to increase the strength and reduce the wall thickness, and thus the 7075 alloy material is used more frequently. Therefore, it is necessary to increase the speed of extrusion and improve productivity. Therefore, the purpose of the present invention is to
The present invention proposes an extrusion processing method in which defects such as tearing (fine scratches) do not occur on the surface of an extruded material even if the extrusion speed is increased.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、鋭意研究を続けた結果、７０７５合金材料がテアリ
ングなどの欠陥を発生するのはＺｎ，Ｍｇ，Ｃｕを含有
するため、これら溶質原子が押出時に発生する転位と反
応して、変形抵抗を増大させるためであり、また、押出
材表面の結晶粒が粗大化するためであることを見出し
た。In order to solve the above-mentioned problems, as a result of intensive studies, the 7075 alloy material contains defects such as tearing because it contains Zn, Mg and Cu. It has been found that this is because it reacts with dislocations generated during extrusion to increase the deformation resistance, and also because the crystal grains on the surface of the extruded material become coarse.
【０００５】即ち押出材の表面で、テアリングや結晶粒
が粗大化する異常組織などの表面欠陥が発生するのは、
固溶したＺｎ，Ｍｇ，Ｃｕらの溶質原子が押出時に発生
する転位と反応し、加工硬化して変形抵抗を増大させ
る。特に押出材中心部が硬くなって、変形によるひずみ
が表層部に集中するようになる。この結果、表層部には
剪断帯が形成されやすく、この剪断帯に沿って割れが発
生したり、結晶粒の粗大化が起こり、異常組織が発生す
る。That is, on the surface of the extruded material, surface defects such as tearing and abnormal structure in which crystal grains become coarse are generated.
Solute atoms such as Zn, Mg, and Cu that are solid-solved react with dislocations generated during extrusion, work hardening, and increase deformation resistance. In particular, the center part of the extruded material becomes hard, and the strain due to deformation concentrates on the surface layer part. As a result, a shear band is likely to be formed in the surface layer portion, cracks are generated along the shear band, coarsening of crystal grains occurs, and an abnormal structure is generated.
【０００６】この点を解決したのが本発明で、その要旨
は、Ｚｎ：４．０〜８．０％，Ｍｇ：１．０〜３．０
％，Ｃｕ：１．０〜３．０％，を含有し、その他Ａｌ及
び不可避的不純物を含有するアルミニウム合金鋳塊を、
通常の方法で均質化熱処理した後、再加熱し、３２０〜
４２０℃で１〜１００時間保持する析出処理を行った
後、３２０〜４２０℃で押出加工する高感度アルミニウ
ム合金押出材の製造方法である。又、Ｔｉ：０．００５
〜０．１０％、Ｚｒ：０．０５〜０．３０％、Ｃｒ：
０．０５〜０．３０％、Ｍｎ：０．０５〜０．５０％の
１種又は２種以上をさらに含有する場合もある。The present invention has solved this point, and the gist thereof is as follows: Zn: 4.0-8.0%, Mg: 1.0-3.0.
%, Cu: 1.0 to 3.0%, and other aluminum alloy ingots containing Al and unavoidable impurities,
After the homogenizing heat treatment by the usual method, reheating, 320 ~
This is a method for producing a high-sensitivity aluminum alloy extruded material, which comprises performing a precipitation treatment of holding at 420 ° C. for 1 to 100 hours and then extruding at 320 to 420 ° C. Also, Ti: 0.005
~ 0.10%, Zr: 0.05-0.30%, Cr:
It may further contain one or more of 0.05 to 0.30% and Mn: 0.05 to 0.50%.
【０００７】[0007]
【作用】次に、本発明に使用するアルミニウム合金材料
の組成を規定した作用・効果について説明する。 Ｚｎ：Ｚｎは、ＭｇやＣｕと複合して含有させることに
より、構造用材料としての強度（引張強さ４５ｋｇｆ／
ｍｍ2以上）を得るために必要である。しかし、４．０
％未満ではこの強度が得られず、８．０％を越えると鋳
造割れが発生し、製造が困難となる。Next, the function and effect of defining the composition of the aluminum alloy material used in the present invention will be described. Zn: Zn has a strength as a structural material (tensile strength of 45 kgf /
mm 2 or more). But 4.0
If it is less than%, this strength cannot be obtained, and if it exceeds 8.0%, casting cracks occur, which makes manufacture difficult.
【０００８】Ｍｇ：Ｍｇは、ＺｎやＣｕと複合して含有
させることにより、構造用材料としての強度（引張強さ
４５ｋｇｆ／ｍｍ2以上）を得るために必要である。し
かし、１．０％未満ではこの強度が得られず、３．０％
を越えると押出加工が困難となる。Mg: Mg is necessary to obtain the strength (tensile strength of 45 kgf / mm 2 or more) as a structural material by including it in combination with Zn or Cu. However, if less than 1.0%, this strength cannot be obtained and 3.0%
Exceeding this makes extrusion difficult.
【０００９】Ｃｕ：Ｃｕは、ＺｎやＭｇと複合して含有
させることにより、構造用材料としての強度（引張強さ
４５ｋｇｆ／ｍｍ2以上）を得るために必要である。し
かし、１．０％未満ではこの強度が得られず、３．０％
を越えると押出加工が困難となる。Cu: Cu is necessary to obtain the strength (tensile strength of 45 kgf / mm 2 or more) as a structural material by including Zn and Mg in combination. However, if less than 1.0%, this strength cannot be obtained and 3.0%
Exceeding this makes extrusion difficult.
【００１０】Ｚｒ，Ｃｒ，Ｍｎ，Ｔｉ：Ｚｒ，Ｃｒ，Ｍ
ｎ，Ｔｉは、いずれも押出材の結晶粒を微細化させるの
に必要な元素であり、Ｔｉは０．００５％未満その他は
０．０５％未満ではこの効果がなく、Ｔｉは０．１０％
を越えると、Ｚｒ及びＣｒでは０．３０％を越えると、
Ｍｎでは０．５０％を越えると、鋳造時に巨大な晶出物
が生成し、押出材の表面性状が悪くなる。Zr, Cr, Mn, Ti: Zr, Cr, M
n and Ti are elements necessary for refining the crystal grains of the extruded material, and if Ti is less than 0.005% and less than 0.05%, this effect is not obtained, and Ti is 0.10%.
When Zr and Cr exceed 0.30%,
If Mn exceeds 0.50%, huge crystallized substances are generated during casting, and the surface properties of the extruded material deteriorate.
【００１１】析出処理：析出処理は、Ａｌ，Ｚｎ，Ｍ
ｇ，Ｃｕの複合化合物（例えばＡｌＺｎＭｇ，ＭｇＺｎ
2、ＡｌＣｕＭｇの化合物）を析出させ、その大きさを
０．２〜１０μｍに成長させる。これにより押出性を改
善する。析出処理温度が３２０℃未満または析出処理を
行わないときでは、析出物が０．２μｍ未満と微細とな
る（あるいはＺｎ，Ｍｇ，Ｃｕの溶質原子が固溶してい
る）ため、押出性が低下する。押出材の中心部では固溶
した溶質原子が、押出時に転位と反応して、変形抵抗を
増大させ、その結果として押出材の表層部に変形が集中
し、割れなどが発生し、表面性状が劣化する。押出材の
表層部では、固溶した溶質原子が、押出し時に剪断帯を
形成し、表面に割れの発生や肌荒れを生じさせ、押出性
を低下させる。析出処理温度が４２０℃を越すと、Ａ
ｌ，Ｚｎ，Ｍｇ，Ｃｕの複合化合物が析出せず、押出性
が低下する。また、処理時間が１時間未満では、Ａｌ，
Ｚｎ，Ｍｇ，Ｃｕの複合化合物が析出せず、押出性が低
下する。処理時間が１００時間を越えてた場合でも、Ａ
ｌ，Ｚｎ，Ｍｇ，Ｃｕの複合化合物の析出効果が変わら
ない。上記の析出処理を行っても、押出温度が３２０℃
よりも低いときは、変形抵抗が増大して、押出性を低下
させる。押出温度が４２０℃を越すと析出処理で粗大化
させた析出物が再固溶しやすくなって、固溶した溶質原
子が増すことで押出性が低下する。Precipitation treatment: The precipitation treatment is made of Al, Zn, M
Composite compound of g and Cu (eg AlZnMg, MgZn
2 , a compound of AlCuMg) is deposited and the size thereof is grown to 0.2 to 10 μm. This improves extrudability. When the precipitation treatment temperature is lower than 320 ° C. or when the precipitation treatment is not carried out, the precipitates become finer than 0.2 μm (or the solute atoms of Zn, Mg and Cu are in solid solution), so the extrudability is lowered. To do. In the central part of the extruded material, solute atoms dissolved in solids react with dislocations during extrusion, increasing the deformation resistance, and as a result, deformation concentrates on the surface layer of the extruded material, causing cracks, etc. to degrade. In the surface layer portion of the extruded material, the solute atoms in solid solution form a shear band during extrusion, which causes cracks and rough skin on the surface and reduces extrudability. If the precipitation temperature exceeds 420 ° C, A
The composite compound of l, Zn, Mg, and Cu does not precipitate, and the extrudability decreases. If the processing time is less than 1 hour, Al,
The composite compound of Zn, Mg and Cu does not precipitate, and the extrudability decreases. Even if the processing time exceeds 100 hours, A
The precipitation effect of the complex compound of l, Zn, Mg, and Cu does not change. Even if the above precipitation treatment is performed, the extrusion temperature is 320 ° C.
If it is lower than that, the deformation resistance increases, and the extrudability is reduced. When the extrusion temperature exceeds 420 ° C., the precipitates coarsened by the precipitation treatment are likely to be redissolved, and the solute atoms in the solid solution increase, so that the extrudability deteriorates.
【００１２】上記析出処理に先立って行う鋳塊の均質化
処理は、鋳造時に形成されたＡｌＭｇＣｕ系の共晶化合
物を分解し、強度を高める効果と、その他の成分として
含有するＭｎ等の遷移金属の濃度分布を均一にし、結晶
粒を細かくする効果とがある。The homogenization treatment of the ingot prior to the above-mentioned precipitation treatment has the effect of decomposing the AlMgCu eutectic compound formed during casting and increasing the strength, and the transition metal such as Mn contained as another component. Has the effect of making the concentration distribution of the solution uniform and making the crystal grains finer.
【００１３】処理温度が４６０℃未満では、鋳造時に形
成されたＡｌＭｇＣｕ系の共晶化合物が分解せず、遷移
金属の濃度分布も均一にならない。５００℃を越すと共
晶化合物が融解し、水素などの拡散しやすい不純物が、
この溶解した部分に拡散してくる。この結果、押出材で
欠陥が発生しやすくなる。処理時間が１時間未満では、
上記効果が得られず、５０時間を越えてもこの効果は飽
和し、ほとんど変わらない。When the treatment temperature is lower than 460 ° C., the AlMgCu eutectic compound formed during casting is not decomposed and the transition metal concentration distribution is not uniform. When the temperature exceeds 500 ° C, the eutectic compound melts, and impurities such as hydrogen that easily diffuse,
Diffuse into this dissolved part. As a result, defects easily occur in the extruded material. If the processing time is less than 1 hour,
The above effect was not obtained, and even after 50 hours, this effect was saturated and remained almost unchanged.
【００１４】[0014]
【実施例】実施例１ Ａｌ−４．０％Ｚｎ−２．８％Ｍｇ−１．３％Ｃｕ系合
金を、通常の方法で溶解し、直径２００ｍｍの鋳塊を鋳
造後、４８０℃×１０ｈｒで均質化処理後、表１に示す
条件で、析出処理を行い、析出処理した材料の析出物の
検鏡と、３５０及び４００℃で押出速度を変えて、直径
４０ｍｍに押出た。押出後、押出材の表面性状を目視観
察で行い、きず欠陥が１個／ｃｍ2以下が得られる押出
速度を求めた。これらの結果を表１に併記した。そして
評価基準として、押出速度が１ｍ／ｍｉｎ以上が得られ
るものを本発明とした。すなわち、発明例のＮｏ．１１
〜１５は、析出物の大きさとして０．４μｍ以上の大き
さのものが得られ、押出加工速度も１．４ｍ／ｍｉｎ以
上が得られた。しかし、比較例のＮｏ．１６は析出処理
を行わなかったため、析出物の大きさが０．１μｍ以下
で、押出温度が４００℃の場合でも押出速度は０．４ｍ
／ｍｉｎと低くなった。Ｎｏ．１７は析出処理温度が３
００℃と低く、Ｎｏ．１８は逆に４５０℃と高いため、
いずれも析出物の大きさが０．１μｍ以下と大きく成長
しないので、押出速度は０．４ｍ／ｍｉｎと低くなっ
た。Ｎｏ．１９は析出処理温度が３５０℃で発明の範囲
にあるが、処理時間が０．５ｈｒと短いため析出物が大
きくならず、押出速度は０．５ｍ／ｍｉｎと低くなっ
た。 注）析出物に関しては、均質化処理後の冷却で数μｍの
粗大な化合物も析出するが、本発明での析出処理では、
この数は微細な化合物に比べて少ないためは省いてい
る。Example 1 Al-4.0% Zn-2.8% Mg-1.3% Cu-based alloy was melted by a usual method, and a slab having a diameter of 200 mm was cast, and then 480 ° C. × 10 hr. After the homogenization treatment under 1., a precipitation treatment was performed under the conditions shown in Table 1, and a precipitation of a material subjected to the precipitation treatment was observed with a microscope, and the extrusion speed was changed at 350 and 400 ° C. to extrude into a diameter of 40 mm. After the extrusion, the surface properties of the extruded material were visually observed to determine the extrusion rate at which 1 flaw / cm 2 or less was obtained. The results are also shown in Table 1. Then, as an evaluation criterion, the present invention is one in which an extrusion speed of 1 m / min or more is obtained. That is, No. 1 of the invention example. 11
In Nos. 15 to 15, a precipitate having a size of 0.4 μm or more was obtained, and the extrusion processing speed was 1.4 m / min or more. However, in Comparative Example No. No. 16 did not undergo the precipitation treatment, so the size of the precipitate was 0.1 μm or less, and the extrusion rate was 0.4 m even when the extrusion temperature was 400 ° C.
/ Min It became low. No. No. 17 has a precipitation treatment temperature of 3
As low as 00 ° C., On the contrary, 18 is as high as 450 ℃,
In both cases, the size of the precipitate did not grow as large as 0.1 μm or less, so the extrusion rate was low at 0.4 m / min. No. No. 19 had a precipitation treatment temperature of 350 ° C., which was within the range of the invention, but the treatment time was as short as 0.5 hr, so that the precipitate did not become large and the extrusion rate was low at 0.5 m / min. Note) Regarding the precipitate, although a coarse compound of several μm is also precipitated by cooling after the homogenization treatment, in the precipitation treatment of the present invention,
This number is omitted because it is smaller than that of fine compounds.
【００１５】[0015]
【表１】 [Table 1]
【００１６】実施例２ Ａｌ−８．０％Ｚｎ−１．１％Ｍｇ−１．１％Ｃｕ系合
金を、通常の方法で溶解し、直径２００ｍｍの鋳塊を鋳
造後、４８０℃×１０ｈｒで均質化処理後、表２に示す
条件で、析出処理を行い、析出処理した材料の析出物の
検鏡と、３５０及び４００℃で押出速度を変えて、直径
４０ｍｍに押出た。試験方法及び評価方法は、実施例１
と同様とし、これらの結果を表２に併記した。すなわ
ち、発明例のＮｏ．２１〜２５は、析出物の大きさとし
て０．３μｍ以上の大きさのものが得られ、押出加工速
度も１．４ｍ／ｍｉｎ以上が得られた。しかし、比較例
のＮｏ．２６は析出処理を行わなかったため、析出物の
大きさが０．１μｍ以下で、押出温度が４００℃の場合
でも押出温度は０．３ｍ／ｍｉｎと低くなった。Ｎｏ．
２７は析出処理温度が３００℃と低く、Ｎｏ．２８は逆
に４５０℃と高いため、いずれも析出物の大きさが０．
１μｍ以下と大きく成長しないので、押出速度は０．４
ｍ／ｍｉｎと低くなった。Ｎｏ．２９は析出処理温度が
３５０℃で発明の範囲にあるが、処理時間が０．５ｈｒ
と短いため析出物が大きくならず、押出速度は０．５ｍ
／ｍｉｎと低くなった。 注）析出物に関しては、均質化処理後の冷却で数μｍの
粗大な化合物も析出するが、本発明での析出処理では、
この数は微細な化合物に比べて少ないためは省いてい
る。Example 2 An Al-8.0% Zn-1.1% Mg-1.1% Cu alloy was melted by a usual method, and a slab having a diameter of 200 mm was cast, followed by heating at 480 ° C. for 10 hours. After the homogenization treatment, a precipitation treatment was carried out under the conditions shown in Table 2, and a precipitation of the material subjected to the precipitation treatment was observed with a microscope, and the extrusion speed was changed at 350 and 400 ° C. to extrude the material into a diameter of 40 mm. The test method and evaluation method are described in Example 1.
The results are also shown in Table 2. That is, No. 1 of the invention example. In Nos. 21 to 25, the size of the precipitate was 0.3 μm or more, and the extrusion processing speed was 1.4 m / min or more. However, in Comparative Example No. In No. 26, since the precipitation treatment was not performed, the size of the precipitate was 0.1 μm or less, and the extrusion temperature was as low as 0.3 m / min even when the extrusion temperature was 400 ° C. No.
No. 27 has a low precipitation treatment temperature of 300 ° C. 28, on the contrary, is as high as 450 ° C., and therefore the size of the precipitates is 0.2.
Since it does not grow as large as 1 μm or less, the extrusion rate is 0.4
It was as low as m / min. No. No. 29 has a precipitation treatment temperature of 350 ° C. and is within the range of the invention, but the treatment time is 0.5 hr.
Since the length is short, the precipitate does not grow and the extrusion speed is 0.5 m.
/ Min It became low. Note) Regarding the precipitate, although a coarse compound of several μm is also precipitated by cooling after the homogenization treatment, in the precipitation treatment of the present invention,
This number is omitted because it is smaller than that of fine compounds.
【００１７】[0017]
【表２】 [Table 2]
【００１８】実施例３ Ａｌ−８．０％Ｚｎ−２．８％Ｍｇ−２．７％Ｃｕ系合
金を、通常の方法で溶解し、直径２００ｍｍの鋳塊を鋳
造後、４７０℃×１０ｈｒで均質化処理後、表３に示す
条件で、析出処理を行い、析出処理した材料の析出物の
検鏡と、３５０及び４００℃で押出速度を変えて、直径
４０ｍｍに押出た。試験方法及び評価方法は、実施例１
と同様とし、これらの結果を表３に併記した。すなわ
ち、発明例のＮｏ．３１〜３５は、析出物の大きさとし
て０．５μｍ以上の大きさのものが得られ、押出加工速
度も１．４ｍ／ｍｉｎ以上が得られた。しかし、比較例
のＮｏ．３６は析出処理を行わなかったため、析出物の
大きさが０．１μｍで、押出温度が４００℃の場合でも
押出速度は０．４ｍ／ｍｉｎと低くなった。Ｎｏ．３７
は析出処理温度が３００℃と低く、Ｎｏ．３８は逆に４
５０℃と高く、いずれも析出物の大きさが０．１μｍ
で、大きく成長しないので押出速度は０．４ｍ／ｍｉｎ
と低くなった。Ｎｏ．３９は析出処理温度が３５０℃で
発明の範囲にあるが、処理時間が０．５ｈｒと短いため
析出物が大きくならず、析出温度は０．６ｍ／ｍｉｎと
低くなった。 注）析出物に関しては、均質化処理後の冷却で数μｍの
粗大な化合物も析出するが、本発明での析出処理では、
この数は微細な化合物に比べて少ないためは省いてい
る。Example 3 Al-8.0% Zn-2.8% Mg-2.7% Cu-based alloy was melted by a usual method, and a cast ingot having a diameter of 200 mm was cast at 470 ° C. × 10 hr. After the homogenization treatment, a precipitation treatment was carried out under the conditions shown in Table 3, and a precipitate of the material subjected to the precipitation treatment was observed under a microscope. The extrusion speed was changed at 350 and 400 ° C., and the mixture was extruded to a diameter of 40 mm. The test method and evaluation method are described in Example 1.
The results are also shown in Table 3. That is, No. 1 of the invention example. For Nos. 31 to 35, the size of the precipitate was 0.5 μm or more, and the extrusion speed was 1.4 m / min or more. However, in Comparative Example No. Since No. 36 was not subjected to the precipitation treatment, the size of the precipitate was 0.1 μm, and the extrusion speed was as low as 0.4 m / min even when the extrusion temperature was 400 ° C. No. 37
Has a low precipitation treatment temperature of 300 ° C., and No. 38 is 4 on the contrary
As high as 50 ℃, the size of precipitates is 0.1 μm in both cases.
The extrusion speed is 0.4 m / min because it does not grow significantly.
Became low. No. No. 39 had a precipitation treatment temperature of 350 ° C., which was within the range of the present invention, but the treatment time was as short as 0.5 hr, so that the precipitate did not become large and the precipitation temperature was as low as 0.6 m / min. Note) Regarding the precipitate, although a coarse compound of several μm is also precipitated by cooling after the homogenization treatment, in the precipitation treatment of the present invention,
This number is omitted because it is smaller than that of fine compounds.
【００１９】[0019]
【表３】 [Table 3]
【００２０】実施例４ Ａｌ−６．２％Ｚｎ−２．４％Ｍｇ−２．３％Ｃｕ−
０．１２％Ｚｒ−０．０５％Ｔｉ系合金を、通常の方法
で溶解し、直径２００ｍｍの鋳塊を鋳造後、５００℃で
２ｈｒの均質化処理をした後、表４に示す条件で析出処
理を行い、析出処理した材料の析出物の検鏡と、３５０
及び４００℃で押出速度を変えて、直径４０ｍｍに押出
した。試験方法及び評価方法は、実施例１と同様とし、
これらの結果を表４に併記した。すなわち、発明例のＮ
ｏ．４１〜４５は、析出物の大きさとして０．５μｍ以
上の大きさのものが得られ、押出加工速度も１．２ｍ／
ｍｉｎ以上が得られた。しかし、比較例のＮｏ．４６は
析出処理を行わなかったため、析出物の大きさが０．１
μｍで、押出温度が４００℃の場合でも押出速度は０．
５ｍ／ｍｉｎと低くなった。Ｎｏ．４７は析出処理温度
が３００℃と低く、Ｎｏ．４８は逆に４５０℃と高く、
いずれも析出物の大きさが０．１μｍで、大きく成長し
ないので押出速度は０．５ｍ／ｍｉｎと低くなった。Ｎ
ｏ．４９は析出処理温度が３５０℃で発明の範囲にある
が、処理時間が０．５ｈｒと短いため析出物が大きくな
らず、押出温度は０．８ｍ／ｍｉｎと低くなった。 注）析出物に関しては、均質化処理後の冷却で数μｍの
粗大な化合物も析出するが、本発明での析出処理では、
この数は微細な化合物に比べて少ないためは省いてい
る。Example 4 Al-6.2% Zn-2.4% Mg-2.3% Cu-
0.12% Zr-0.05% Ti alloy was melted by a usual method, and after casting an ingot having a diameter of 200 mm, homogenization treatment was performed at 500 ° C. for 2 hours, and then precipitation was performed under the conditions shown in Table 4. And a spectroscopic examination of the deposit of the deposited material.
And the extrusion speed was changed at 400 ° C. to extrude into a diameter of 40 mm. The test method and evaluation method were the same as in Example 1,
The results are also shown in Table 4. That is, N of the invention example
o. Nos. 41 to 45 have a size of the precipitate of 0.5 μm or more, and the extrusion speed is 1.2 m / m.
A value of min or more was obtained. However, in Comparative Example No. No. 46 did not undergo the precipitation treatment, so the size of the precipitate was 0.1.
Even if the extrusion temperature is 400 ° C., the extrusion rate is 0.
It became as low as 5 m / min. No. No. 47 had a precipitation treatment temperature as low as 300 ° C. On the contrary, 48 is as high as 450 ℃,
In both cases, the size of the precipitate was 0.1 μm and it did not grow significantly, so the extrusion rate was low at 0.5 m / min. N
o. No. 49 had a precipitation treatment temperature of 350 ° C. and was within the range of the invention, but the treatment time was as short as 0.5 hr, so that the precipitate did not become large and the extrusion temperature was as low as 0.8 m / min. Note) Regarding the precipitate, although a coarse compound of several μm is also precipitated by cooling after the homogenization treatment, in the precipitation treatment of the present invention,
This number is omitted because it is smaller than that of fine compounds.
【００２１】[0021]
【表４】 注）析出物に関しては、均質化処理後の冷却で数μｍ
の粗大な化合物も析出するが、本発明での析出処理で
は、この数は微細な化合物に比べて少ないためは省いて
いる。[Table 4] Note) Regarding precipitates, several μm after cooling after homogenization treatment
Although a coarse compound of 1 is also precipitated, this number is omitted in the precipitation treatment of the present invention because this number is smaller than that of a fine compound.
【００２２】実施例５ Ａｌ−５．５％Ｚｎ−２．４％Ｍｇ−１．５％Ｃｕ−
０．２％Ｃｒ系合金（７０７５）を、通常の方法で溶解
し、直径２００ｍｍの鋳塊を鋳造後、４６０℃で４８ｈ
ｒの均質化処理をした後、第５表に示す条件で析出処理
を行い、４００℃で押出速度を変えて、直径４０ｍｍに
押出た。押出後、押出材の表面性状を目視観察で行っ
た。押出材の表面に発生したきず欠陥が、１個／ｃｍ2
以上になったときの押出速度を最高の押出速度とした。
試験方法及び評価方法は、実施例１と同様とし、これら
の結果を表５に併記した。すなわち、発明例のＮｏ．５
１〜５４は、析出物の大きさとして０．４μｍ以上の大
きさのものが得られ、押出加工速度も１．２ｍ／ｍｉｎ
以上が得られた。しかし、比較例のＮｏ．５５は析出処
理を行わなかったため、析出物の大きさが０．１μｍ以
下で、押出温度が４００℃の場合でも押出速度は０．４
ｍ／ｍｉｎと低くなった。Ｎｏ．５６は析出処理温度が
３００℃と低く、Ｎｏ．５７は逆に４５０℃と高く、い
ずれも析出物の大きさが０．１μｍ以下と大きく成長し
ないので、押出速度は０．４ｍ／ｍｉｎと低くなった。
Ｎｏ．５８は析出処理温度が３５０℃で発明の範囲にあ
るが、処理時間が０．５ｈｒと短いため析出物が大きく
ならず、押出速度は０．７ｍ／ｍｉｎと低くなった。 注）析出物に関しては、均質化処理後の冷却で数μｍの
粗大な化合物も析出するが、本発明での析出処理では、
この数は微細な化合物に比べて少ないためは省いてい
る。Example 5 Al-5.5% Zn-2.4% Mg-1.5% Cu-
0.2% Cr-based alloy (7075) is melted by a usual method, and a slab having a diameter of 200 mm is cast, and then 48 hours at 460 ° C.
After homogenizing r, precipitation treatment was performed under the conditions shown in Table 5, and the extrusion rate was changed at 400 ° C. to extrude into a diameter of 40 mm. After extrusion, the surface properties of the extruded material were visually observed. 1 flaw / cm 2 on the surface of extruded material
The extrusion speed when the above values were obtained was taken as the maximum extrusion speed.
The test method and evaluation method were the same as in Example 1, and these results are also shown in Table 5. That is, No. 1 of the invention example. 5
Nos. 1 to 54 were obtained in which the size of the precipitate was 0.4 μm or more, and the extrusion speed was 1.2 m / min.
The above is obtained. However, in Comparative Example No. No. 55 did not undergo a precipitation treatment, so the size of the precipitate was 0.1 μm or less, and the extrusion rate was 0.4 even when the extrusion temperature was 400 ° C.
It was as low as m / min. No. No. 56 had a precipitation treatment temperature as low as 300 ° C. On the contrary, No. 57 was as high as 450 ° C., and the size of the precipitate did not grow as large as 0.1 μm or less, so that the extrusion rate was as low as 0.4 m / min.
No. No. 58 had a precipitation treatment temperature of 350 ° C., which was within the range of the invention, but the treatment time was as short as 0.5 hr, so that the precipitate did not become large and the extrusion rate was low at 0.7 m / min. Note) Regarding the precipitate, although a coarse compound of several μm is also precipitated by cooling after the homogenization treatment, in the precipitation treatment of the present invention,
This number is omitted because it is smaller than that of fine compounds.
【００２３】[0023]
【表５】 [Table 5]
【００２４】[0024]
【発明の効果】以上説明したように、本発明はＡｌ−Ｚ
ｎ−Ｍｇ−Ｃｕ系アルミニウム合金鋳塊を、通常の方法
で均質化熱処理した後、再加熱し析出処理を行った後、
押出加工することにより、押出し材の表面にテアリング
などの欠陥が発生することなく押出し速度を高めること
ができ、産業上極めて有効である。As described above, according to the present invention, the Al-Z
After homogenizing and heat-treating the n-Mg-Cu-based aluminum alloy ingot by a usual method, reheating and performing a precipitation treatment,
By carrying out the extrusion process, the extrusion speed can be increased without causing defects such as tearing on the surface of the extruded material, which is extremely effective in industry.
Claims (2)
同様），Ｍｇ：１．０〜３．０％，Ｃｕ：１．０〜３．
０％，を含有し、その他Ａｌ及び不可避的不純物を含有
するアルミニウム合金鋳塊を、通常の方法で均質化熱処
理した後、再加熱し３２０〜４２０℃で１〜１００時間
保持する析出処理を行った後、押出加工することを特徴
とする高強度アルミニウム合金押出材の製造方法。1. Zn: 4.0 to 8.0% (weight%, the same applies hereinafter), Mg: 1.0 to 3.0%, Cu: 1.0 to 3.
An aluminum alloy ingot containing 0% of Al and other Al and unavoidable impurities is homogenized and heat-treated by an ordinary method, and then reheated and subjected to a precipitation treatment of holding at 320 to 420 ° C. for 1 to 100 hours. A method for producing a high-strength aluminum alloy extruded material, which comprises subjecting the material to extrusion processing.
０．００５〜０．１０％並びにＺｒ：０．０５〜０．３
０％、Ｃｒ：０．０５〜０．３０％、Ｍｎ：０．０５〜
０．５０％のいずれか１種又は２種以上を含有している
請求項１記載の高強度アルミニウム合金押出材の製造方
法。2. The aluminum alloy ingot further comprises Ti:
0.005-0.10% and Zr: 0.05-0.3
0%, Cr: 0.05 to 0.30%, Mn: 0.05 to
The method for producing a high-strength aluminum alloy extruded material according to claim 1, containing 0.50% of any one kind or two or more kinds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3038886A JPH0794700B2 (en) | 1991-02-12 | 1991-02-12 | Method for manufacturing high strength aluminum alloy extruded material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3038886A JPH0794700B2 (en) | 1991-02-12 | 1991-02-12 | Method for manufacturing high strength aluminum alloy extruded material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04333548A JPH04333548A (en) | 1992-11-20 |
| JPH0794700B2 true JPH0794700B2 (en) | 1995-10-11 |
Family
ID=12537694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3038886A Expired - Fee Related JPH0794700B2 (en) | 1991-02-12 | 1991-02-12 | Method for manufacturing high strength aluminum alloy extruded material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0794700B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2805282B1 (en) * | 2000-02-23 | 2002-04-12 | Gerzat Metallurg | A1ZNMGCU ALLOY PRESSURE HOLLOW BODY PROCESS |
| JP5360591B2 (en) * | 2009-01-08 | 2013-12-04 | 日本軽金属株式会社 | Aluminum alloy ingot and method for producing the same |
| JP6249435B2 (en) * | 2012-08-10 | 2017-12-20 | 日本軽金属株式会社 | Aluminum-zinc alloy extruded material and method for producing the same |
| JP6096488B2 (en) * | 2012-11-30 | 2017-03-15 | アイシン軽金属株式会社 | Billet for extrusion molding of 7000 series aluminum alloy and method for producing extruded profile |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538902A (en) * | 1978-08-17 | 1980-03-18 | Sumitomo Light Metal Ind Ltd | Manufacture of high strength a -zn-mg alloy for extrusion |
| JPS6058299B2 (en) * | 1982-06-08 | 1985-12-19 | 株式会社神戸製鋼所 | Method for producing Al-Zn-Mg-Cu alloy material with excellent formability |
-
1991
- 1991-02-12 JP JP3038886A patent/JPH0794700B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04333548A (en) | 1992-11-20 |
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