7005versus6061Aluminum

　　Youmayhavenoticedthattherearetwotypesofaluminumlistedinthespecsforaluminumbikes;7005or6061.WhichisthestrongermaterialYourfirstanswermaybe6061becauseyouseeitonthemoreexpensivebikes.7005aluminumisactuallythestrongeraluminumalloy.Thisbegsthenextquestion,whichisthebettermaterial6061isofcourse,oratleastthatistheopinionofmostbikemanufacturers.WhyisitbetterToseethedifferencesonemusttakealookatthetwomaterialsandtheirproperties.Inthetablebelowseveraldifferentaluminumalloysarelistedforcomparison;2014,6061,and7005.

　　Alloy

　　TraceMetals

　　TensileStrength

　　YieldStrength

　　PercentElongation

　　HB

　　Notes

　　2014

　　4.5%Copper0.8%Silicon0.8%Manganese0.5%Magnesium

　　27,000psi

　　14,000psi

　　18%

　　45

　　2XXXseriesaluminumisprimarilyalloyedwithcopper.

　　2014-T6

　　4.5%Copper0.8%Silicon0.8%Manganese0.5%Magnesium

　　70,000psi

　　60,000psi

　　13%

　　135

　　2XXXseriesaluminumisprimarilyalloyedwithcopper.

　　6061

　　1%Magnesium0.6%Silicon0.2%Chromium0.3%Copper

　　18,000psi

　　8,000psi

　　25%

　　30

　　6XXXseriesaluminumisprimarilyalloyedwithmagnesiumandsilicon.

　　6061-T6

　　1%Magnesium0.6%Silicon0.2%Chromium0.3%Copper

　　45,000psi

　　40,000psi

　　12%

　　95

　　6XXXseriesaluminumisprimarilyalloyedwithmagnesiumandsilicon.

　　7005-T6

　　4.5%Zinc1.4%Magnesium0.45%Manganese0.13%Chromium

　　51,000psi

　　42,000psi

　　13%

　　NA

　　7XXXseriesaluminumisprimarilyalloyedwithzinc.

　　Thetensilestrengthofthematerialistheamountofstressthatitcantakebeforecompletefailure,andtheyieldstrengthistheamountofstressbeforethematerialispermanentlydeformed(tryjumpingonanoldframeuntilyoubenditandyouhaveexceededtheyieldstrengthofthematerial).PercentelongationistheamountofdeformationthatthematerialundergoesbeforeitbreaksandtheHBisameasureofthehardness.Itshouldbenotedthatthe‘T6’listedafterthealloyistheheattreatmentofthealloy.T6referstoasolutiontreatmentandartificialagingofthemetal.AllbikeframesareheattreatedevenifthemanufacturerdoesnotlisttheT6behindthegradeofaluminum.

　　Fromthechartyoucanseethat7005-T6isslightlystrongerthan6061-T6,butstrongerthanbothofthemis2014-T6andinfactthereisanother7XXXseriesaluminum(7075)thatisstrongeraswell.Whychoose7005anD6061thenBikeframesarenotmadeoutofsolidaluminum,whichishowthetestsamplesforcomparingmaterialstrengthsareconstructed.Abikeframeismadeupoftubingthatisweldedtogether:welding7075and2014arealmostimpossiblefeatsthateliminatethemasviablechoicesformakingabike.Thatleaves7005(azincalloy)and6061(amagnesium/siliconalloy).Thedifferencebetweenthetwoisthat7005,becauseofitshighalloycontent(over6%),ishardertomanipulatethematerialandtoweldit.Thismeansthatwith6061itismucheasiertoaddstrengthaddingtubingfeaturesliketriplebutting,ovalizedtubing,andtaperedwallsthatreducetheweightandimprovethestrengthofthetubing.

　　Afinalnotetoputthisintoperspectiveistocomparealuminumtotheotherframematerials.Aluminumisfarweakerthanbothtitaniumandcro-mosteel,sowhyuseitAluminum’sgreatestadvantageisthatitissolightwhencomparedtocro-mosteelandcheapwhencomparedtotitanium.Thiscombinationoffeaturesmakesitthechoiceofmaterialformakinglight,high-performanceframesforareasonableprice.

　　我试一下把重点挑出来：1．目前铝合金车架普遍使用的材料是7005与6061两种。2．7000系列主要以锌为主要合金，成分比例达到6％。6000系列主要以镁和矽为主要合金，总成分比例较低。3．论强度的话7005较强，但只是稍微强一点，从表中可以看出来，yieldstrength（让铝材**弯曲变形的力度）只比6061强一点。4．所有用作车架材料的铝合金都经过热处理T6，5．但论整体来讲，6061是较好的材料。由于7005含其他金属比例高，所以焊接，处理都比较困难，尤其是7075（后两个数字代表含合金比例）它的比例更高，所以一般是不能用作车架的材料。相比之下，6061由于含其他金属比例较低，因此可以通过异型，各种处理来增加它的强度和减低它的风阻，甚至可以做到3次抽管来减低重量。6．虽然7005管购买价比较高，但整体来讲6061的成本比较高，因为6061所经过的热处理和其他工序比较烦琐复杂。因此6061的车架一般比较贵。也因此大多比较高端的车架（如TCR）也使用6061

　　此材料多少钱一公斤，本页面资源信息价格仅供参考，因现货库存规格、数量及价格随时在变动，无法一一及时更新，如有需求请联系我司客服详询！

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