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Plastic Deformation And Alloys

Plastic Deformation And Alloys






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    Plastic Deformation And Alloys Plastic Deformation And Alloys Presentation Transcript

    • Plastic Deformation & Alloys Keyword: Malleable, Elastic Deformation, Plasticity, Ductile
    • Malleable
      • A temporary shape change that is self-reversing after the force is removed, so that the object returns to its original shape, is called elastic deformation . In other words, elastic deformation is a change in shape of a material at low stress that is recoverable after the stress is removed. This type of deformation involves stretching of the bonds, but the atoms do not slip past each other.
    • Plastic Deformation
      • Beyond the elastic limit the material undergoes plastic deformation. Unlike elastic deformation , plastic deformation is not recoverable, i.e. the change is permanent.
      • Ductile materials undergo large plastic deformations and waisting before fracturing ; brittle materials undergo very little plastic deformation.
      • Also known as placticity
    • Plastic Deformation Failure by plastic deformation Use the info link to see examples of designs and materials testing, using rapid prototyping
    • Plastic Deformation
    • Alloys
      • A mixture containing two or more metallic elements or metallic and non-metallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper
      • Ferrous and nonferrous alloys
    • Alloys
      • Change the melting point
      • Increase strength, hardness & ductility
      • Change colour
      • Give rise to better casting
      • Change electrical and thermal properties
    • Iron & Carbon
      • Stainless Steel is an alloy of Carbon and Iron
      • Stainless steel is one of the fastest growing metals. Today, it is difficult to imagine life without this most durable and versatile material. And, it is 100% recyclable.
    • Steel
      • Stainless steel (steel and 18% chromium, 8% nickel, 8% magnesium)
      • High-speed steel (steel and tungsten)
      • Mild steel (iron and 0.15-0.35% carbon)
      • Medium carbon steel (0.4-0.7% carbon)
      • High-carbon steel (0.8-1.5% carbon)
      • High tensile steel (low carbon steel & nickel)
      • Manganese steel (1.5% manganese)
    • Task 1
      • Explain the term ‘alloy’ and give examples of two ferrous and two non-ferrous alloys.
      • Give one example of how the following metals might be used and state which of the material’s characteristics makes it particularly appropriate for the application that you have given.
          • Cast iron Copper
          • Aluminium Brass
    • In search of superalloys
    • Superalloys
      • A superalloy , or high-performance alloy , is an alloy that exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Superalloys typically have an austenitic face-centred cubic crystal structure.
    • Superalloys
      • A superalloy's base alloying element is usually nickel , cobalt , or nickel-iron. Superalloy development has relied heavily on both chemical and process innovations and has been driven primarily by the aerospace and power industries.
    • Superalloys
      • Typical applications are in the aerospace industry, eg. for turbine blades for jet engines
    • Task 2
      • Define the following words and add a suitable images to illustrate your answer
        • Plastic deformation
        • Elastic deformation
        • Superalloys
          • Creep
          • Oxidisation
        • Malleable
        • Ductile
    • Links and Revision
      • http://www.materialseducation.org/students/mainpage.htm
      • http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Structure/deformation.htm
      • http://www.ornl.gov/.../Pages/Alloy-Development.html
      • http://www.estane.com/technology/alloys.asp
      • http://www.thefreedictionary.com/alloy
      • http://www.bssa.org.uk/
      • http://en.wikipedia.org/wiki/Superalloys
      • http://www.msm.cam.ac.uk/phase-trans/2003/nickel.html
      • http://www.msm.cam.ac.uk/.../superalloys.html
      • http://www.msm.cam.ac.uk/phase-trans/2002/1510.mpg
      • http://www.doitpoms.ac.uk/tlplib/creep/printall.php
      • http://www.jfe-21st-cf.or.jp/chapter_3/3a_3.html
      • http://info.wkmp.tuwien.ac.at/2003-rp_coll/