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Ppt presipitation hardening

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  • 1. PRECIPITATION HARDENING UNIVERSITAS JENDERAL ACHMAD YANI BANDUNG
  • 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. PENDAHULUAN
  • 4. PENDAHULUAN Skematik temperatur tehadap waktu
  • 5. Pengaruh waktu aging terhadap sifat mekanik
  • 6. gambar 2.16. Skematik pengaruh temperatur pada presipitat Al-Cu. (a) Garis solvusmetastabil dan (b) waktu memulai pembentukan presipitat
  • 7. MEKANISME PENGUATAN Interaksi Dislokasi dengan Presipitat Cuttingdislokasi Presipitat
  • 8. MEKANISME PENGUATAN Bowingdislokasi
  • 9. Paduan yang bisa dikeraskan dengan proses presipitation
  • 10. DIAGRAM FASA Al-Cu
  • 11. Contoh proses precipitation hardening Al-
  • 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. 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. 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. 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. SEKIAN “ Niscaya Allah akan meninggikan orang-orang yang beriman diantaramu dan orang-orang yang diberi ilmu pengetahuan beberapa derajat” (Q.S. Al-Mujadilah: 11)