Jun
24
Metal alloys properties?
Hi so I was looking for a BMX bike and I discovered a lot of alloys I never heard of before.Basically what I’m asking is if anyone could sort them first by weight/volume ratio (from the heaviest to the lightest) and then by overall strength/volume (from the weakest to the hardest) and by cost.The alloys are: Hi-Ten steel (a mixture of steel and carbon I suppose),Cr-Mo steel 4130 (steel + chrome + molybdeum and some carbon I think),Aluminium alloy 6061 (aluminium + magnesium + silicon),magnesium alloy (I don’t exactly know what alloy they could be using for bikes,anyone can enlighten me here?) and titanium alloy (again I do now know what alloy they could be using for bikes..) For exact percentage please search on wikipedia.. thanks guys I’m asking this just because I’m curious I don’t have enough money to buy anything better than Cr-Mo steel so I’m just asking thanks!
The site for materials science type answers is
Matweb.com
for example on the 6061 I got (looks better if you do search)
Physical PropertiesMetricEnglishComments
Density 2.70 g/cc0.0975 lb/in³AA; Typical
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 3030AA; Typical; 500 g load; 10 mm ball
Tensile Strength, Ultimate 124 MPa18000 psiAA; Typical
Tensile Strength, Yield 55.2 MPa8000 psiAA; Typical
Elongation at Break 25.0 %
@Thickness 1.59 mm25.0 %
@Thickness 0.0625 inAA; Typical
30.0 %
@Diameter 12.7 mm30.0 %
@Diameter 0.500 inAA; Typical
Modulus of Elasticity 68.9 GPa10000 ksiAA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Ultimate Bearing Strength 228 MPa33100 psiEdge distance/pin diameter = 2.0
Bearing Yield Strength 103 MPa14900 psiEdge distance/pin diameter = 2.0
Poissons Ratio 0.3300.330Estimated from trends in similar Al alloys.
Fatigue Strength 62.1 MPa
@# of Cycles 5.00e+8 9000 psi
@# of Cycles 5.00e+8 completely reversed stress; RR Moore machine/specimen
Machinability 30 %30 %0-100 Scale of Aluminum Alloys
Shear Modulus 26.0 GPa3770 ksiEstimated from similar Al alloys.
Shear Strength 82.7 MPa12000 psiAA; Typical
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