SUPENDI (2613091037)
PRECIPITATION HARDENING
UNIVERSITAS JENDERAL ACHMAD YANI
BANDUNG
PENDAHULUANPresipitation Hardening adalah proses pengerasan paduan logam dengan menyebarkan 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
PENDAHULUAN
PENDAHULUAN
Skematik temperatur tehadap waktu
Pengaruh waktu aging terhadap sifat mekanik
gambar 2.16. Skematik pengaruh temperatur pada presipitat Al-Cu. (a) Garis solvus metastabil dan (b) waktu memulai pembentukan presipitat
MEKANISME PENGUATAN
Interaksi Dislokasi dengan Presipitat
dislokasiPresipitat
Cutting
MEKANISME PENGUATAN
Bowing
dislokasi
Paduan yang bisa dikeraskan dengan proses presipitation hardening
DIAGRAM FASA Al-Cu
Contoh proses precipitation hardening Al-Cu
Schematic depiction of several stages in the formation of the equilibrium precipitate ( ) phase. (a) A supersaturated solid solution. (b) A transition, precipitate phase. (c) The equilibrium u phase, within the α-matrix phase.
The precipitation hardening characteristics of a 2014 aluminum alloy (0.9 wt% Si, 4.4 wt% Cu, 0.8 wt% Mn, 0.5 wt% Mg) at four different aging temperatures: yield strength,
A transmission electron micrograph showing the microstructure of a 7150-T651 aluminum alloy (6.2Zn, 2.3Cu, 2.3Mg, 0.12Zr, the balance Al) that has been precipitation hardened. The light matrix phase in the micrograph is an aluminum solid solution. The majority of the small plate-shaped dark precipitate particles 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 Airplane Company.)
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.
SEKIAN
Terima kasih
“ Niscaya Allah akan meninggikan orang-orang yang beriman diantaramu dan orang-orang yang diberi ilmu pengetahuan
beberapa derajat”(Q.S. Al-Mujadilah: 11)