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)