材料科學(xué)基礎(chǔ)英文版課件_(12)-資料下載頁(yè)
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【正文】 ls (12) ? Factors affecting the formation of a substitutional solid solution Point Defects – Point Defects in Metals (13) Atomic radius: nm, , ?=% Crystal structure: both FCC Electronegativity: , Ni, Difference= Valence: Cu +1, Ni +2 Point Defects – Point Defects in Metals (14) Atomic radius: nm, , ?=% Crystal structure: both FCC Electronegativity: , Ag, Difference=0 Valence: Cu +1, Ag +1 Point Defects – Point Defects in Metals (15) ? Factors affecting the formation of an interstitial solid solution Solute atom size – the deciding factor。 only very small solute atoms can fit into interstitial site without causing considerable lattice distortion because even those very small solute atoms are still larger than the interstitial size C, O, H, and N in Fe or Ni – typical example for interstitial solid solutions – usually occupying octahedral interstices (Ro= for fcc crystals, and Roz = and Roxy = for bcc crystals) Ro = (a – 2R)/2 = (2?2R 2R)/2 = Rt = ?3a/4 – R = (?3/4)? 2?2R) – R = Roz = (a – 2R)/2 = (4R/?3 2R)/2 = Roxy = (a ?2 – 2R)/2 = ((4R/?3) ?2 2R)/2 = Rt = a?5/4 R = (4R/?3)?5/4 – R = (?5/?3 – 1)R = a =4R/ ?
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