Ppt presipitation hardening

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Ppt presipitation hardening

  1. 1. PRECIPITATION HARDENING UNIVERSITAS JENDERAL ACHMAD YANI BANDUNG
  2. 2. PENDAHULUANPresipitation Hardening adalah proses pengerasan paduan logam denganmenyebarkan partikel-partikel halus secara merata. dengan proses penuaan(aging) yang sebelumnya telah mengalami proses pelarutan ( solution treatment)dan pencelupan (quenching) Syarat Presipitation Hardening : •Merupakan Logam paduan •Batas kelarutan padat harus berkurang dengan turunnya temperatur
  3. 3. PENDAHULUAN
  4. 4. PENDAHULUAN Skematik temperatur tehadap waktu
  5. 5. Pengaruh waktu aging terhadap sifat mekanik
  6. 6. gambar 2.16. Skematik pengaruh temperatur pada presipitat Al-Cu. (a) Garis solvusmetastabil dan (b) waktu memulai pembentukan presipitat
  7. 7. MEKANISME PENGUATAN Interaksi Dislokasi dengan Presipitat Cuttingdislokasi Presipitat
  8. 8. MEKANISME PENGUATAN Bowingdislokasi
  9. 9. Paduan yang bisa dikeraskan dengan proses presipitation
  10. 10. DIAGRAM FASA Al-Cu
  11. 11. Contoh proses precipitation hardening Al-
  12. 12. Schematic depiction of several stages in the formation of the equilibriumprecipitate ( ) phase. (a) A supersaturated solid solution. (b) Atransition, precipitate phase. (c) The equilibrium u phase, within the α-matrix phase.
  13. 13. The precipitation hardening characteristics of a 2014aluminum alloy (0.9 wt% Si, 4.4 wt% Cu, 0.8 wt% Mn, 0.5wt% Mg) at four different aging temperatures: yield strength,
  14. 14. A transmission electron micrograph showing the microstructure of a 7150-T651aluminum alloy (6.2Zn, 2.3Cu, 2.3Mg, 0.12Zr, the balance Al) that has beenprecipitation hardened. The light matrix phase in the micrograph is analuminum solid solution. The majority of the small plate-shaped dark precipitateparticles are a transition phase, the remainder being the equilibrium (MgZn2)phase. Note that grain boundaries are “decorated” by some of these particles.(Courtesy of G. H. Narayanan and A. G. Miller, Boeing Commercial AirplaneCompany.)
  15. 15. DAFTAR PUSTAKA William D. Callister, Jr. “Materials Science and Engineering 7th” , John Wiley & Sons, Inc. 2007. R. E. Smallman and R. J. Bishop, “Modern Physical Metallurgy and Materials Engineering 6th” , Butterworth-Heinemann, 1999. D.A. Porter and K.E.Easterling, “Phase Transformations in Metals and Alloys 2nd ” chapman & Hall, 1992. William F.Smith “ Principles of Materials Science and Engineering 3rd ” McGraw-Hill Inc, 1993.
  16. 16. SEKIAN “ Niscaya Allah akan meninggikan orang-orang yang beriman diantaramu dan orang-orang yang diberi ilmu pengetahuan beberapa derajat” (Q.S. Al-Mujadilah: 11)

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