2. PENDAHULUAN
Presipitation 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 :
âąMerupakan Logam paduan
âąBatas kelarutan padat harus berkurang dengan turunnya temperatur
12. 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.
13. 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,
14. 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 âdecoratedâ by some of these particles.
(Courtesy of G. H. Narayanan and A. G. Miller, Boeing Commercial Airplane
Company.)
15. DAFTAR PUSTAKA
ï¶ William D. Callister, Jr. âMaterials Science and Engineering 7thâ , John
Wiley & Sons, Inc. 2007.
ï¶ R. E. Smallman and R. J. Bishop, âModern Physical Metallurgy and
Materials Engineering 6thâ , Butterworth-Heinemann, 1999.
ï¶ D.A. Porter and K.E.Easterling, âPhase Transformations in Metals and
Alloys 2nd â chapman & Hall, 1992.
ï¶ William F.Smith â Principles of Materials Science and Engineering 3rd â
McGraw-Hill Inc, 1993.
16. SEKIAN
â Niscaya Allah akan meninggikan orang-orang yang beriman
diantaramu dan orang-orang yang diberi ilmu pengetahuan beberapa
derajatâ
(Q.S. Al-Mujadilah: 11)