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Pendahuluan Fisika Material (10)

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  • 1. Sesion#10
    PendahuluanFisika Material
    Dr. ErfanHandoko
    JurusanFisika
    FakultasMatematikadanIlmuPengetahuanAlam
  • 2. Outline
    PENDAHULUAN
    SOLUBILITY LIMIT
    PHASES
    MICROSTRUCTURE
    PHASE EQUILIBRIA
    EQUILIBRIUM PHASE DIAGRAMS
    BINARY ISMORPHOUS SYSTEM
    INTERPRETATION OF PHASE DIAGRAMS
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    2
  • 3. Bab 9
    diagram fasa
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    3
  • 4. PENDAHULUAN
    WHY STUDY Phase Diagrams?
    Bagipara engineer halinimenjadisangatpentingkarena diagram fasaterkaitdenganperancangandanpengontrolanprosedurperlakuanpanas, sehinggadapatdiperoleh material denganstruktur yang diinginkan.
    A scanning electron micrograph showing the microstructure of a plain carbon steel that contains 0.44 wt% C. The large dark areas are proeutectoid ferrite. Regions having the alternating light and dark lamellar structure are pearlite; the dark and light layers in the pearlite correspond, respectively, to ferrite and cementite phases. During etching of the surface prior to examination, the ferrite phase was preferentially dissolved; thus, the pearlite appears in topographical relief with cementite layers being elevated above the ferrite layers. 3000. (Micrograph courtesy of Republic Steel Corporation.)
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    4
  • 5. SOLUBILITY LIMIT
    Solubility limit adalahkonsentrasimaksimumdari atom solute yang terlarutdalampelarutuntukmembentuklarutanpadat.
    Solubility limit dariguladalam air bergantungterhadaptemperaturdari air yang dapatdirepresentasikandalamgrafikdisamping
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    5
  • 6. PHASES
    Sebuahfasadidefinisikansebagaibagianhomogendarisistem yang memilikikarakteristikkimiadanfisika yang seragam.
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    6
  • 7. MICROSTRUCTURE
    Sifat-sifatfisikadankhususnyasifatmekanikdarisuatu material bergantungterhadapmikrostruktur.
    Mikrostrukturmerupakansubjekpengamatanmikroskopikdenganmenggunakanmikoskopoptikatauelektron.
    Dalampaduanlogammikrostrukturdikarakterisasiolehjumlahfasa yang muncul.
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    7
  • 8. PHASE EQUILIBRIA
    Equilibriumdapatdijelaskandneganmenggunakanistilahenergibebas (free energy).
    Energibebasmerupakanfungsi internal energidalamsistem.
    Sebuahsistemdikatakanberadadalamkeadaan equilibrium jikaenergibebasnyaberadapadaposisi minimum dibawahkombinasitemperatur, tekanan, dankomposisi.
    Perubahansistemterhadaptemperatur, tekanan, dankomposisimembuatenergibebasnyameningkat
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    8
  • 9. EQUILIBRIUM PHASE DIAGRAMS
    Diagram fasaberisiinformasiuntukmengontrolmikrostrukturataustrukturfasadarisebuahpaduantertentu.
    Equilibrium Phase Diagrams merepresentasikanhubungandiantaratemperaturdankomposisidankuantitasfasapadakeadaan equilibrium
    Variable tekanandibuatkonstanyaitusebesar 1 atm.
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    9
  • 10. BINARY ISMORPHOUS SYSTEM
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    10
  • 11. INTERPRETATION OF PHASE DIAGRAMS
    Phase Present
    Padatitik A:
    60 wt% Ni – 40 wt% Cu
    suhu 1100oC terbentukfasaα
    Padatitik B:
    35 wt% Ni – 65 wt% Cu
    suhu 1100oC terbentukfasaα + L
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    11
  • 12. CONTINUE..
    Determination of Phase Composition
    • Buatgarislurus yang mengenaibataskeduafasapadatemperatur yang diinginkan
    • 13. Tandaiperpotongangarisinipadamasing-masingbatasfasa
    • 14. Buatgarisvertikalpadabatasfasainihinggadiperolehperpotongandengansumbuhorisontal (komposisi)
    • 15. CLadalahkomposisifasa liquid
    • 16. CSadalahkomposisifasa solid
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    12
  • 17. CONTINUE..
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    13
  • 18. CONTINUE..
    C0 = 35 wt% Ni
    CL= 32 wt% Ni
    Cα = 43 wt% Ni
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    14
  • 19. VOLUME FRACTION
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    15
  • 20. Thank you….
    Material Science and Engineering An Introduction (William D. Callister)
    1/18/2011
    © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
    16
    Sumber :

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