410 Notes Non-Ferrous

410 Notes Non-Ferrous - MS&E 410/510 Class Notes...

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MS&E 410/510 Class Notes –Non-Ferrous alloys V. Non-Ferrous Alloys A Overview Non-ferrous metals used for wide range of applications, either specialized structural applications, and in a wide range of non-structural applications. The technology and infrastructure for non-ferrous metallurgy is complex and a country’s non-ferrous metallurgy is taken as a key indicator of their state of technological development B. Aluminum & Alloys 1. Overview a) Mass of aluminum is roughly 35 percent that of Fe and 30 percent that of Cu - high specific strength possible - high sectional stiffness possible b) Strength - commercially pure aluminum has tensile strength about 90 MPa (weak) - by cold working and alloying, tensile strengths approaching 700 MPa are available “stronger than steel” NOTE: “Stronger than steel” is almost always deceptive. Tensile strengths for dead annealed common low carbon plain steels start at about 100 MPa while the best tool steels approach 2000 MPa. Thus “stronger than steel” almost always means “the strongest possible versions of this XXX material are stronger than the weakest common steels.” Often the best versions of XXX don’t measure up to common production low carbon steels in the 200-400 MPa range. - loses strength quickly at high temperatures (best alloys good to 200-260˚C) - maintains ductility and increases strength at low T c) Corrosion resistant - forms thin (≈2 nm) tenacious passivating oxide skin, thus has high corrosion resistance - resistant to many acids, but alkalis attack the oxide skin and therefore are corrosive to Al
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