KR20090045981A - Al-alloy for bumper back beam - Google Patents

Al-alloy for bumper back beam Download PDF

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KR20090045981A
KR20090045981A KR1020070111862A KR20070111862A KR20090045981A KR 20090045981 A KR20090045981 A KR 20090045981A KR 1020070111862 A KR1020070111862 A KR 1020070111862A KR 20070111862 A KR20070111862 A KR 20070111862A KR 20090045981 A KR20090045981 A KR 20090045981A
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South Korea
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aluminum alloy
less
alloy
back beam
bumper back
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KR1020070111862A
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Korean (ko)
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박도봉
김은태
박상우
오개희
이광식
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주식회사동양강철
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Priority to KR1020070111862A priority Critical patent/KR20090045981A/en
Publication of KR20090045981A publication Critical patent/KR20090045981A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

Abstract

본 발명은 범퍼백 빔용 알루미늄 합금에 관한 것으로, 압출성과 기계적 특성을 향상시키기 위하여 7000계열 알루미늄 합금에서의 금속간 화합물과 결정립 조직의 제어를 통하여 인성 및 연신율을 향상시킴으로써 우수한 압출성과 기계적 특성을 확보할 수 있는 범퍼 백 빔용 알루미늄 합금에 관한 것이다.The present invention relates to an aluminum alloy for the bumper back beam, to improve the toughness and elongation through the control of the intermetallic compound and grain structure in the 7000 series aluminum alloy in order to improve the extrudability and mechanical properties to ensure excellent extrudability and mechanical properties. And an aluminum alloy for a bumper back beam.

본 발명의 범퍼 백 빔용 알루미늄 합금은 Al-Zn-Mg계 합금에 있어서, Zn 5.4~5.6wt%, Mg 1.3~1.5wt%, Si 0.15wt% 이하, Fe 0.15wt% 이하, Zr 0.12~0.15wt%, Cu 0.05wt% 이하, Mn 0.05wt% 이하, Ti 0.05wt%이하, Cr 0.002wt% 그리고 잔부의 Al으로 조성된다.Aluminum alloy for the bumper back beam of the present invention, in the Al-Zn-Mg alloy, Zn 5.4 ~ 5.6wt%, Mg 1.3 ~ 1.5wt%, Si 0.15wt% or less, Fe 0.15wt% or less, Zr 0.12 ~ 0.15wt %, Cu 0.05wt% or less, Mn 0.05wt% or less, Ti 0.05wt% or less, Cr 0.002wt% and the balance Al.

상기 범퍼 백 빔용 알루미늄 합금은 7000계열 알루미늄 합금의 구성요소 중 Fe,Si 및 Ti를 이용하여 금속간 화합물을 제어함으로써 인성을 증가시키고, 상기 알루미늄 합금의 구성요소 중 Zr과 Cr를 이용하여 결정립 조직을 변화시킴으로써 우수한 기계적 특성과 압출성을 동시에 확보할 수 있는 장점이 있다.The aluminum alloy for the bumper back beam increases toughness by controlling intermetallic compounds using Fe, Si, and Ti among the components of the 7000 series aluminum alloy, and increases the grain structure by using Zr and Cr among the components of the aluminum alloy. By changing, there is an advantage that can secure excellent mechanical properties and extrudability at the same time.

알루미늄 합금, 범퍼, 7000계 알루미늄, 재결정, 용착선, 금속간 화합물 Aluminum alloy, bumper, 7000 aluminum, recrystallization, weld line, intermetallic compound

Description

범퍼 백 빔용 알루미늄 합금{Al-alloy for bumper back beam} Aluminum alloy for bumper back beams {Al-alloy for bumper back beam}

본 발명은 범퍼백 빔용 알루미늄 합금에 관한 것으로, 압출성과 기계적 특성을 향상시키기 위하여 7000계열 알루미늄 합금에서의 금속간 화합물과 결정립 조직의 제어를 통하여 인성 및 연신율을 향상시킴으로써 우수한 압출성과 기계적 특성을 확보할 수 있는 범퍼 백 빔용 알루미늄 합금에 관한 것이다.The present invention relates to an aluminum alloy for the bumper back beam, to improve the toughness and elongation through the control of the intermetallic compound and grain structure in the 7000 series aluminum alloy in order to improve the extrudability and mechanical properties to ensure excellent extrudability and mechanical properties. And an aluminum alloy for a bumper back beam.

알루미늄은 철강 다음으로 많이 사용되고 있는 금속으로서, 가볍고 내식성과 가공성이 좋으며 전기 및 열 전도도가 높을 뿐 아니라 Cu, Mg, Si, Zn, Mn, Ni 등의 원소와 다양한 종류의 고강도, 고내식성 합금을 만들어 항공기, 가정용품, 건축, 차량, 기계, 전기 등 가정과 산업 전분야에 걸쳐 사용되고 있다.Aluminum is the second most used metal after steel. It is lightweight, has good corrosion resistance and workability, has high electrical and thermal conductivity, and makes various kinds of high strength and high corrosion resistance alloys with elements such as Cu, Mg, Si, Zn, Mn, and Ni. It is used in all areas of home and industry such as aircraft, household goods, construction, vehicles, machinery, and electricity.

상기와 같은 알루미늄은 합금의 종류에 따라 분류되는바, 1000계열은 99.00wt% 이상의 알루미늄을 함유한 순수 알루미늄, 2000계열은 Al-Cu계 합금, 3000계열은 Al-Mn계 합금, 4000계열은 Al-Si계 합금, 5000계열은 Al-Mg계 합금, 6000계열은 Al-Mg-Si계 합금, 7000계열은 Al-Zn-Mg계 합금으로 분류, 표시하는 방 법이 널리 사용되고 있다.As described above, the aluminum is classified according to the type of alloy, the 1000 series is pure aluminum containing aluminum of 99.00wt% or more, the 2000 series is Al-Cu alloy, the 3000 series is Al-Mn alloy, the 4000 series is Al Si alloys, 5000 series are Al-Mg alloys, 6000 series Al-Mg-Si alloys, 7000 series Al-Zn-Mg alloys are widely used.

알루미늄 합금의 경우 다양한 분류방법이 존재하나 가공방법에 따라 크게 단련용 합금(Wrought Alloy)과 주조용 합금(Casting Alloy)으로 분류할 수 있으며 각각은 열처리 형태에 따라서 열처리를 하는 합금과 열처리 하지 않는 합금으로 분류될 수 있다.In the case of aluminum alloys, there are various classification methods, but they can be classified into wrought alloys and casting alloys depending on the processing method. Can be classified as.

이때, 단련용 합금은 압출, 압연, 단조 등의 가공에 사용되는 합금이며 주조용 합금은 사형주조, 다이캐스팅 등에 사용되는 합금이다.At this time, the alloy for annealing is an alloy used for processing extrusion, rolling, forging, etc., and the alloy for casting is an alloy used for sand casting, die casting, and the like.

상기 단련용 합금은 압출, 압연, 단조 등의 가공공정에 사용되는 합금을 말하고 국제적으로 등록된 합금의 수 또한 500여개에 이르고 있으며 일반적으로 1000계열부터 7000계열까지의 알루미늄 합금을 일컫는다.The forging alloy refers to an alloy used in processing processes such as extrusion, rolling and forging, and the number of internationally registered alloys is also about 500, and generally refers to aluminum alloys from 1000 series to 7000 series.

특히 7000계열 알루미늄 합금은 시효경화성이 우수하며 생산량 측면에서는 다른 알루미늄 합금에 비해 적지만 7000계열 가공재합금으로써 항공기, 철도, 차량, 스포츠용품 등 일반적으로 높은 강도가 요구되는 구조재에 사용된다. In particular, the 7000 series aluminum alloy has excellent age hardenability and is less than other aluminum alloys in terms of production volume, but the 7000 series alloy is used for structural materials that generally require high strength such as aircraft, railways, vehicles, and sporting goods.

상기 Al-Zn-Mg계 합금은 크게 Cu를 함유하여 알루미늄 합금 중 가장 높은 강도를 가지는 고강도 계열과 Cu를 함유하지 않고 Zn과 Mg량을 적게 하여 용접성, 압출가공성, 부식성을 높인 중강도 계열의 2계열로 분리된다.The Al-Zn-Mg-based alloy contains a large amount of Cu and has a high strength series having the highest strength among aluminum alloys, and a medium-strength series 2 having high weldability, extrusion processability, and corrosion resistance by reducing the amount of Zn and Mg without containing Cu. Separated into series.

상기 Al-Zn-Mg계 알루미늄 합금은 용접재로도 사용되며 6000계열 알루미늄 합금보다 강하다.The Al-Zn-Mg-based aluminum alloy is also used as a welding material and is stronger than 6000 series aluminum alloy.

상기 Al-Zn-Mg-Cu계 합금은 연강(Mild steel)보다도 강하나 용접성이 좋지 않아 주로 스팟 웰딩(Spot welding)등이 사용되고 압출성 또한 좋지 않아 6000계열 알루미늄 합금(6063) 생산성의 1/5~1/6정도 밖에 되지 않는다.The Al-Zn-Mg-Cu-based alloy is stronger than mild steel but has poor weldability, so spot welding is mainly used, and the extrusion property is not good. It's only about 1/6.

주로 수송기기 구조재나 항공기용 구조재 등으로 사용되나 내식성이 좋지 않아 순 알루미늄을 피복한 알클래드(Alclad)합금으로도 사용된다. It is mainly used as a structural material for transportation equipment or aircraft, but it is also used as an Alclad alloy coated with pure aluminum due to its poor corrosion resistance.

상기 7000계열 알루미늄 합금은 Zn과 Mg를 첨가함에 따라 석출경화 효과를 얻을 수 있으며, 고강도로 인하여 낮은 압출성을 가지고 있지만 기술이 발전함에 따라 각종 압출 제품들에 대한 높은 품질이 요구되고 있으며 제품 구조가 복잡해지고 있기 때문에 우수한 압출성이 요구되고 있는 현실이다.The 7000 series aluminum alloy has a precipitation hardening effect by adding Zn and Mg, and has a low extrudability due to its high strength, but as the technology develops, high quality of various extruded products is required. Since it is complicated, the outstanding extrudeability is calculated | required.

특히 자동차 부품의 경우에는 우수한 기계적 특성이 요구되기 때문에 7000계열 알루미늄 합금의 적용에 적합하지만 압출성이 좋지 않아 크랙 발생등에 의한 불량률이 증가되고 부품가가 높아지는 문제가 있다.In particular, in the case of automotive parts, it is suitable for the application of the 7000 series aluminum alloy because excellent mechanical properties are required, but there is a problem in that the defective rate is increased due to crack generation due to poor extrudeability and the parts are increased.

본 발명은 종래의 7000계열 알루미늄 합금의 제반 문제점들을 해결하기 위하여 창안된 것으로, 7000계열 알루미늄 합금에서의 금속간 화합물 제어 및 결정립 조직 제어를 통하여 우수한 압출성과 기계적 특성을 가지는 범퍼백 빔용 알루미늄합금을 제공하는 것이다.The present invention was devised to solve various problems of the conventional 7000 series aluminum alloy, and provides an aluminum alloy for a bumper back beam having excellent extrudability and mechanical properties through intermetallic compound control and grain structure control in the 7000 series aluminum alloy. It is.

본 발명의 범퍼 백 빔용 알루미늄 합금은 Al-Zn-Mg계 합금에 있어서, Zn 5.4~5.6wt%, Mg 1.3~1.5wt%, Si 0.15wt% 이하, Fe 0.15wt% 이하, Zr 0.12~0.15wt%, Cu 0.05wt% 이하, Mn 0.05wt% 이하, Ti 0.05wt%이하, Cr 0.002wt% 그리고 잔부의 Al으로 조성된다.Aluminum alloy for the bumper back beam of the present invention, in the Al-Zn-Mg alloy, Zn 5.4 ~ 5.6wt%, Mg 1.3 ~ 1.5wt%, Si 0.15wt% or less, Fe 0.15wt% or less, Zr 0.12 ~ 0.15wt %, Cu 0.05wt% or less, Mn 0.05wt% or less, Ti 0.05wt% or less, Cr 0.002wt% and the balance Al.

본 발명의 범퍼 백 빔용 알루미늄 합금은 7000계열 알루미늄 합금의 구성요소 중 Fe,Si 및 Ti를 이용하여 금속간 화합물을 제어함으로써 인성을 향상시키고, 상기 알루미늄 합금의 구성요소 중 Zr과 Cr를 이용하여 결정립 조직을 변화시킴으로써 우수한 기계적 특성과 압출성을 동시에 확보할 수 있는 장점이 있다.The aluminum alloy for the bumper back beam of the present invention improves toughness by controlling intermetallic compounds using Fe, Si, and Ti among the components of the 7000 series aluminum alloy, and uses grains of Zr and Cr among the components of the aluminum alloy. By changing the structure, there is an advantage that can simultaneously secure excellent mechanical properties and extrudability.

본 발명은 고 압출성을 지니는 자동차 범퍼 백 빔용 알루미늄 합금으로써 7000계열 알루미늄 합금의 압출성을 향상시키고 우수한 기계적 특성을 확보하도록 하는데 그 목적이 있다.An object of the present invention is to improve the extrudability and secure excellent mechanical properties of the 7000 series aluminum alloy as an aluminum alloy for automobile bumper back beam having high extrudability.

본 발명의 범퍼 백 빔용 알루미늄 합금은 Al-Zn-Mg계 합금에 있어서, Zn 5.4~5.6wt%, Mg 1.3~1.5wt%, Si 0.15wt% 이하, Fe 0.15wt% 이하, Zr 0.12~0.15wt%, Cu 0.05wt% 이하, Mn 0.05wt% 이하, Ti 0.05wt%이하, Cr 0.002wt% 그리고 잔부의 Al으로 조성된다.Aluminum alloy for the bumper back beam of the present invention, in the Al-Zn-Mg alloy, Zn 5.4 ~ 5.6wt%, Mg 1.3 ~ 1.5wt%, Si 0.15wt% or less, Fe 0.15wt% or less, Zr 0.12 ~ 0.15wt %, Cu 0.05wt% or less, Mn 0.05wt% or less, Ti 0.05wt% or less, Cr 0.002wt% and the balance Al.

Zn은 알루미늄 합금 내에서 알루미늄 합금의 경도를 향상시키는 역할을 하며, Mg을 동시에 첨가하면 Mg와 결합하고, 시효경화처리를 통하여 MgZn2를 석출함으로써 석출경화에 의한 더 높은 경도를 얻을 수 있도록 하는 성분으로써, 그 함량이 5.4wt%에 미치지 못하면 MgZn2 석출량이 부족하여 필요한 만큼의 물리적 특성를 얻을 수 없으며, 5.6wt%를 초과하면 응고영역이 넓어짐에 따른 결정립 조대화로 인한 편석이 증가하게 된다. Zn serves to improve the hardness of the aluminum alloy in the aluminum alloy, and when Mg is added at the same time, it combines with Mg, and precipitates MgZn 2 through aging hardening to obtain higher hardness due to precipitation hardening. As such, if the content is less than 5.4 wt%, the amount of MgZn 2 precipitate is insufficient to obtain the required physical properties. If the content exceeds 5.6 wt%, segregation due to grain coarsening increases as the solidification area is widened.

Mg는 알루미늄 합금 내의 Zn의 저온 용해도를 감소시키고 Zn과 함께 MgZn2를 형성하여 기계적 성질에 영향을 미치며 압출 압력을 증가시키고 기계적 성질을 향상시키는데 그 함량이 1.3wt%에 미치지 못하면 원하는 기계적 성질을 얻을 수 없게 되고, 1.5wt%를 초과하게 되면 압출성이 떨어지게 될 뿐만 아니라 압출 제품의 표면 품질이 저하하게 된다.Mg reduces the low-temperature solubility of Zn in aluminum alloys and forms MgZn 2 with Zn, affecting mechanical properties, increasing extrusion pressure and improving mechanical properties, if the content is less than 1.3wt%, the desired mechanical properties are obtained. If not more than 1.5wt%, not only the extrudability deteriorates but also the surface quality of the extruded product.

Si는 기계적 성질을 좌우하며 상기 Mg와 결합하고 남은 잔량 Si는 단독으로 석출되어 기계적 성질을 향상시키고, 용탕의 유동성을 개선하여 주조성질을 향상시키는 성분으로써, 그 함량이 0.15wt%를 초과하면 압출성 저하로 인하여 생산성이 떨어지게 된다.Si influences the mechanical properties and the remaining amount of Si combined with the Mg is precipitated alone to improve the mechanical properties, improve the flowability of the melt to improve the casting properties, when the content exceeds 0.15wt% extrusion Due to the deterioration of productivity, productivity is reduced.

Fe는 재결정립의 조대화를 억제하고 주조시 결정립을 미세화 효과가 있는 성분으로써, 0.15wt%에 초과하면 연성을 저하시킬 뿐만 아니라 압출성과 생산성을 저하시킨다.Fe is a component that suppresses coarsening of recrystallized grains and refines grains during casting. When it exceeds 0.15 wt%, Fe not only decreases ductility but also reduces extrudability and productivity.

Zr은 용체화 균열 민감도를 감소시키는 역할을 하며 재결정의 생성 및 성장을 억제하는데 가장 효과적인 원소로써 Al3Zr 분산상을 형성하고 에칭 민감도를 최소화하는데, 그 함량이 0.12wt%에 미치지 못하면 재결정층 형성에 대한 억제 효과가 미미하고 0.15wt%를 초과하면 압출성을 저하시키게 된다.Zr plays a role in reducing the solubilization crack sensitivity and is the most effective element in suppressing the formation and growth of recrystallization, forming an Al 3 Zr dispersed phase and minimizing the etching sensitivity. If the inhibitory effect is small and exceeds 0.15 wt%, the extrudability is lowered.

Cu는 알루미늄 합금 내에서 응고수축을 감소시키며, 용탕의 유동성을 개선하는 성분으로 특히 Mg이나 Zn이 첨가되어 있을때 효과가 우수하지만 내식성을 저하를 유발하는 성분이므로 그 함량이 0.05wt%를 초과하면 내식성과 용접성 및 압출성을 떨어뜨리게 된다.Cu reduces solidification shrinkage in aluminum alloy and improves the flowability of molten metal. It is particularly effective when Mg or Zn is added, but it causes corrosion resistance. Therefore, if the content exceeds 0.05wt%, It decreases the weldability and the extrudability.

Mn은 알루미늄 합금 내에 첨가되어 강도와 연성에 미치는 악영향을 감소시키며 결정립 미세화에 유효한 성분으로써, Cr과 결합하여 분산상으로 존재하고 Al-Zn-Mg계 알루미늄 합금 내에서는 AlMn6로 존재하고 Ak-Zn-Mg-Cu계 알루미늄 합금 내에서는 Al20Cu2Mn3을 형성하는데, 그 함량이 0.05wt%를 초과하면 도가니에서 경도가 높은 금속간 화합물이 침적되어 불량이 발생하게 된다.Mn is added in aluminum alloy to reduce the adverse effect on strength and ductility and is an effective component for grain refinement. It is present as a dispersed phase in combination with Cr, and as AlMn 6 in Al-Zn-Mg-based aluminum alloy and Ak-Zn- In the Mg-Cu-based aluminum alloy, Al 20 Cu 2 Mn 3 is formed. When the content exceeds 0.05 wt%, a high hardness intermetallic compound is deposited in the crucible and defects occur.

Ti는 내식성과 양극 산화 피막 처리시에 영향을 미치지 않지만 입자의 미세화 효과로 열간균열 발생을 억제시키고 기계적 절삭성을 향상시키지만 그 함량이 0.05wt%를 초과하게 되면 경도가 높은 티타늄 화합물을 생성시켜 절삭공구의 마모를 가져온다.Although Ti does not affect corrosion resistance and anodization, the micronization effect of particles suppresses hot cracking and improves mechanical cutting, but when the content exceeds 0.05wt%, titanium produces a high hardness titanium cutting tool. Brings wear.

Cr은 재결정층의 생성과 성장을 억제하며 Al, Fe와 함께 화합물을 형성하여 입계에 분포함으로써 시효처리시의 석출을 억제하여 연신율을 향상시켜 주는 역할을 하는바, 그 함량은 0.002wt%를 초과하게 되면 압출성이 감소하게 된다.Cr inhibits the formation and growth of the recrystallized layer and forms a compound with Al and Fe and distributes it at grain boundaries, thereby inhibiting precipitation during aging and improving elongation. The content is more than 0.002wt%. This will reduce the extrudability.

본 발명의 상기 본 발명의 목적과 기술적 구성을 비롯한 그에 따른 작용 효과에 관한 자세한 사항은 본 발명의 바람직한 실시예 통한 아래의 설명에 이해 명확하게 이해될 것이다.Details of the object and the resulting technical effects of the present invention, including the resulting effects of the present invention will be clearly understood in the following description through preferred embodiments of the present invention.

Si 0.108wt%, Fe 0.191wt%, Mg 1.436wt%, Mn 0.011wt%, Zn 5.567wt%, Zr 0.129wt%, Ti 0.003wt% 그리고 나머지 잔부의 Al으로 조성된 본 발명의 알루미늄 합금을 만들어 T5 열처리에서 온도와 시간을 변경함으로써 각각 5가지 조건으로 하여 그에 따른 기계적 특성을 시험을 하였으며 그 결과는 표 1에 나타난 바와 같다.An aluminum alloy of the present invention made of Si 0.108wt%, Fe 0.191wt%, Mg 1.436wt%, Mn 0.011wt%, Zn 5.567wt%, Zr 0.129wt%, Ti 0.003wt% and the remainder of Al was made into T5. By varying the temperature and time in the heat treatment, the mechanical properties were tested according to the five conditions, respectively, and the results are shown in Table 1.

조건Condition 구분division 인장강도(MPa)Tensile Strength (MPa) 항복강도(MPa)Yield strength (MPa) 연신율(%)Elongation (%) 조건 1 Condition 1 1One 438.10438.10 396.47396.47 17.4617.46 22 438.05438.05 396.49396.49 17.5817.58 평균Average 438.1438.1 396.5396.5 17.5217.52 조건 2 Condition 2 1One 450.73450.73 413.73413.73 16.4616.46 22 441.59441.59 406.96406.96 15.9215.92 평균Average 446.2446.2 410.3410.3 16.1916.19 조건 3 Condition 3 1One 448.98448.98 402.24402.24 14.1814.18 22 450.92450.92 402.88402.88 17.4417.44 평균Average 449.95449.95 402.56402.56 15.8115.81 조건 4 Condition 4 1One 348.97348.97 325.88325.88 15.2415.24 22 347.22347.22 326.95326.95 17.2417.24 평균Average 348.09348.09 326.41326.41 16.2416.24 조건 5 Condition 5 1One 345.51345.51 324.13324.13 17.1217.12 22 339.01339.01 319.58319.58 18.3418.34 평균Average 342.26342.26 321.85321.85 17.7317.73

상기의 조건 1은 100℃에서 5시간 시효경화처리 후 150℃에서 6시간 시효경화처리, 조건 2는 100℃에서 3시간 시효경화처리 후 150℃에서 8시간 시효경화처리, 조건 3은 90℃에서 8시간 시효경화처리 후 150℃에서 8시간 시효경화처리, 조건 4는 165℃에서 24시간 시효경화처리, 조건 5는 185℃에서 4시간 시효경화처리한 것이다.The above condition 1 is aged for 5 hours at 100 ° C., then aged at 150 ° C. for 6 hours, condition 2 is aged at 100 ° C. for 3 hours, and then aged at 150 ° C. for 8 hours, and condition 3 at 90 ° C. After 8 hours age hardening treatment, 150 hours 8 hours aging hardening treatment, condition 4 is 165 ℃ 24 hours aging hardening treatment, condition 5 is 185 ℃ 4 hours aging hardening treatment.

상기 조건으로 기계적 특성의 시험 결과를 살펴보면 항복강도와 인장강도 연신율이 모두 우수한 열처리 조건은 조건 2임을 확인할 수 있었다.Looking at the test results of the mechanical properties under the above conditions it was confirmed that the heat treatment conditions excellent in both yield strength and tensile strength elongation is condition 2.

그리고 도 1은 상기와 같은 조건으로 압출된 본 발명의 알루미늄 합금의 압출재 전자현미경 사진으로 용착선부 재결정층 두께가 150㎛이하이고 표면 재결정층 두께(d)가 50~60㎛로 관찰됨을 확인할 수 있었다.1 is an electron micrograph of the extruded material of the aluminum alloy of the present invention extruded under the above conditions it can be confirmed that the weld line recrystallization layer thickness is 150㎛ or less and the surface recrystallization layer thickness (d) of 50 ~ 60㎛. .

도 1은 본 발명의 범퍼 백 빔용 알루미늄 합금의 전자현미경사진으로,1 is an electron micrograph of the aluminum alloy for the bumper back beam of the present invention,

a)는 본 발명의 범퍼 백 빔용 알루미늄 합금의 압출재 용착선부사진,   a) is an extruded material weld line picture of the aluminum alloy for the bumper back beam of the present invention,

b)는 본 발명의 범퍼 백 빔용 알루미늄 합금의 압출재 내부사진,   b) is an internal photo of the extrusion material of the aluminum alloy for the bumper back beam of the present invention,

c)는 본 발명의 범퍼 백 빔용 알루미늄 합금의 압출재 표면사진이다.   c) is an extruded surface photograph of the aluminum alloy for the bumper back beam of the present invention.

Claims (2)

Al-Zn-Mg계 합금에 있어서, Zn 5.4~5.6wt%, Mg 1.3~1.5wt%, Si 0.15wt% 이하, Fe 0.15wt% 이하, Zr 0.12~0.15wt%, Cu 0.05wt% 이하, Mn 0.05wt% 이하, Ti 0.05wt%이하, Cr 0.002wt% 그리고 잔부의 Al으로 조성된 것을 특징으로 하는 범퍼 백 빔용 알루미늄 합금.In Al-Zn-Mg alloy, Zn 5.4-5.6wt%, Mg 1.3-1.5wt%, Si 0.15wt% or less, Fe 0.15wt% or less, Zr 0.12 ~ 0.15wt%, Cu 0.05wt% or less, Mn An aluminum alloy for a bumper back beam, comprising 0.05 wt% or less, Ti 0.05 wt% or less, Cr 0.002 wt%, and the balance Al. 제 1항에 있어서, 상기 범퍼 백 빔용 알루미늄 합금은 T5 조건에서 100℃에서 3시간 시효경화처리 후 150℃에서 8시간 시효경화처리하는 것을 특징으로 하는 범퍼 백 빔용 알루미늄 합금. The aluminum alloy for the bumper back beams according to claim 1, wherein the aluminum alloy for the bumper back beams is aged for 3 hours at 100 ° C. for 8 hours at 150 ° C. under an T5 condition.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012070803A2 (en) * 2010-11-26 2012-05-31 현대비앤지스틸 주식회사 Aluminum-magnesium-silicon-copper alloy for automobile chassis and bodies and a casting method therefor
WO2013105831A1 (en) * 2012-01-12 2013-07-18 한국생산기술연구원 Al-zn alloy with high thermal conductivity for die casting
KR101642850B1 (en) 2015-07-16 2016-07-27 (주)알루코 7xxx aluminium alloy extruded material having enhanced strength, extrusion formability and brilliance
KR101685926B1 (en) 2015-07-16 2016-12-14 (주)알루코 7xxx aluminium alloy extruded material having enhanced strength and extrusion formability
WO2018164314A1 (en) * 2017-03-07 2018-09-13 엘지전자 주식회사 Aluminum alloy

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012070803A2 (en) * 2010-11-26 2012-05-31 현대비앤지스틸 주식회사 Aluminum-magnesium-silicon-copper alloy for automobile chassis and bodies and a casting method therefor
WO2012070803A3 (en) * 2010-11-26 2012-07-19 현대비앤지스틸 주식회사 Aluminum-magnesium-silicon-copper alloy for automobile chassis and bodies and a casting method therefor
WO2013105831A1 (en) * 2012-01-12 2013-07-18 한국생산기술연구원 Al-zn alloy with high thermal conductivity for die casting
KR101642850B1 (en) 2015-07-16 2016-07-27 (주)알루코 7xxx aluminium alloy extruded material having enhanced strength, extrusion formability and brilliance
KR101685926B1 (en) 2015-07-16 2016-12-14 (주)알루코 7xxx aluminium alloy extruded material having enhanced strength and extrusion formability
WO2018164314A1 (en) * 2017-03-07 2018-09-13 엘지전자 주식회사 Aluminum alloy

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