材料科学基础FundamentalofMaterialsScienceProf:TianMinBo Tel:62795426,62772851 E-mail:******@=Spacelattice++=Fe:Al=1:1FeAlThedifferencebetweenspacelatticeandcrystalstructureThisisaSC,×3atoms/cellHCPiscrystalstructure,Example:α-Fe,V,Nb,Ta,Cr,Mo,W,alkalimetalsn=2atoms/=8Thenumberofnearestneighboursaroundeachatomiscalled——Packingfraction=Todetermineξ,theatomislookedasahardsphere,andthenearestneighbourstoucheachother.∴,volumeofatoms/Example:γ-Fe,Al,Ni,Pb,Cu,Ag,Au,stainlessstealn=8×1/8+6×1/2=4atoms/=12Example:Be,Mg,Zn,Cd,Zr,HfTi(lowtemperature)n=CN=12ξ=•••••••••••••••••(Po),α-,Ti,W,Mo,Nb,Ta,K,Na,V,Zr,,Cu,Au,PtAg,Pb,NiHCP2(6),Mg,Zn,BeCo,Zr,
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