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Unformatted text preview: wavelength at T=775K?
(d) What is the fastest growing wavelength at T=775K?
(e) What is the maximum value of the amplification factor, R( ), at 775K?
Regular solution interaction parameter, 25kJmol1
Gradient energy coefficient, 1010 Jm1
Young’s modulus, E=1011Pa Poisson’s ratio, 0.3
Self-diffusion coefficient, D* D* 10 4 exp( 125 kJ / RT )m 2s 1
B 3. In molten aluminum containing 0.01% titanium nucleation is observed as near as
0.01K to the equilibrium transformation temperature. For a nucleation rate of 10 7s1
cm-3 calculate the height and radius of a spherical cap for heterogeneous
nucleation. Assume that the critical radius for homogeneous nucleation in this
system is about 1μm. The equilibrium transformation temperature is 932K, the
enthalpy of fusion is 10.47 kJmol-1, and the atomic mass of aluminum is 26.98
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This document was uploaded on 11/26/2013.
- Fall '13