William Stratton Ph.D. Thesis - MINDS@UW Home

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List of Tables Table Page Table 1.1: for various organic and inorganic amorphous materials. Table 4.1: Bragg reflections for Al2O3 and FCC Al. Table 5.1: Boltzmann sigmoidal values for the CDF fits to the Al88Y7Fe5 and Al88Y7Fe4Cu1 data. G2 was set to 1 to fix the high d value to 1. The Al88Y7Fe5 has a better fit to the data, as seen by the X 2 value. 3 81 100 xiv
Chapter 1. Introduction Amorphous materials are materials without a well defined crystal lattice, meaning that these materials contain short range order (SRO), but not the long range order (LRO) typical of crystalline materials. Both organic and inorganic materials can be made amorphous. Organic amorphous materials include polystyrene, polymethylmetacrylate, and other polymers. Inorganic amorphous materials include amorphous semiconductors (e.g. Si), silicate glasses (e.g. SiO2), and amorphous metals (e.g. Al88Y7Fe5). Structurally amorphous materials may also be glassy, in which case they undergo the glass transition at a temperature Tg. Tg can be defined many ways, but ultimately it is the temperature below which the glass ceases to flow like a liquid 1-4 . This can be measured thermodynamically using differential scanning calorimetry (DSC), physically by measuring the shear viscosity (an amorphous solid is considered to have a viscosity over 10 12 Pa s) 1 , or by measuring changes in physical properties like the specific heat or specific volume 1,5-8 . Representative examples of these measures can be seen in Figure 1.1. Table 1.1 gives Tg for 1
Page 1 and 2: MEDIUM RANGE ORDER IN HIGH ALUMINUM
Page 3 and 4: To my wife Elisabeth i
Page 5 and 6: Abstract High Al-content metallic a
Page 7 and 8: Table of Contents List of Figures
Page 9 and 10: List of Figures Figure Page Figure
Page 11 and 12: Figure 2.8: V(Φ) at varying values
Page 13 and 14: electron beam exposure. The sharp f
Page 15: Figure 5.7: FEM data for Al88Y7Fe5
Page 19 and 20: Material Type Tg ( o C) Reference P
Page 21 and 22: dH / dt (arb. units) time Figure 1.
Page 23 and 24: enough to avoid any nucleation onse
Page 25 and 26: nanocrystals are thermally stable u
Page 27 and 28: The structural difference between t
Page 29 and 30: Structures for various metallic gla
Page 31 and 32: ( , ) V k Q = ( r, , ) − ( r, , )
Page 33 and 34: of 1-3 nm is readily achievable in
Page 35 and 36: than the STEM FEM V 66,67,84 . This
Page 37 and 38: interesting behavior upon devitrifi
Page 39 and 40: Λ is a characteristic ordering len
Page 41 and 42: amorphous matrix crystal l R d R bi
Page 43 and 44: For a crystal oriented to a Bragg c
Page 45 and 46: number of crystals in a column will
Page 47 and 48: 3 d π 2 Rt max Zmax Φ = . (2.21)
Page 49 and 50: eciprocal lattice point 1 d hkl awa
Page 51 and 52: A hkl 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Page 53 and 54: V(C hklΦ,d) 0.4 0.3 0.2 0.1 0.4 0.
Page 55 and 56: V(C 111 Φ) 0.12 0.10 0.08 0.06 0.0
Page 57 and 58: Φ = 6π d ( 72 − 6π + π ρ) m
Page 59 and 60: V(t) 0.16 0.14 0.12 0.10 0.08 0.06
Page 61 and 62: ⎛ 3 ⎛ 4 6tΩ⎞⎞ d = ⎜ Chkl
Page 63 and 64: Chapter 3. Experimental Set-up Prep
Page 65 and 66: A B 0.25 1/Å 0.25 1/Å Figure 3.1:
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〈IBF〉, to the bright field inte
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Once the relative thickness is know
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Given that FEM is a quantitative el
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eam at a uniform intensity across t
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Low Filtering Limit ω l (Å -1 ) 0
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sample 101 . Much of the influence
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3.07 Thickness Dependant Thinning A
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Residual XRD Intensity (arb. units)
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Intensity (arb. units) 0.30 Al 88 Y
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3.08 Beam Induced Crystallization o
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Fraction of Atoms 0 120 keV 100 200
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V(k) x10 -3 10 8 6 4 2 Al 92 Sm 8 P
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to produce an accurate FEM data set
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Deformation Al 92Sm 8 sample: Rapid
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intensity (arb. units) 3 4 {111} {2
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Al2O3 Al hkl d (1/nm) hkl d (1/nm)
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easons. First, the as-spun V(k) for
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atoms locally organized into an FCC
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in Figure 4.6. Still, this begs the
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Φ 0.20 0.15 0.10 0.05 0.00 10 21 A
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Chapter 5. Al88Y7Fe5 and Al88Y7Fe4C
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diffracting condition through the m
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increases the number of Al nanocrys
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Fraction of nanocrystals x10 -3 Fra
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Al 88 Y 7 Fe 5 Enthalpy (J/g) 0 -1
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Al 88Y 7Fe 5 100 nm Al 88Y 7Fe 4Cu
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5.04 Al88Y7Fe4Cu1 Discussion The de
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FEM is sensitive to both critical a
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devitrified structure has the possi
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fraction between the as quenched ma
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number, etc.) can give insight to t
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24. Liquid Metals Website, http://w
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66. Voyles, P. M., Gibson, J. M. &
Page 133:
105. Zuo, J. M. Electron detection
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William Stratton Ph.D. Thesis - MINDS@UW Home

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