STUDIES ON EARLY AND LATE STAGES OF FORMATION OF δ' PHASES IN Al-Li ALLOYS BY NEUTRON SMALL ANGLE SCATTERING

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Abstract
The phase separation process in Al-9.5 and 11.4 at.% Li alloys aged at 423 K has been studied over a wide q ( = ( 4πsinθ)/λ) range (0.06 < q <; 6 nm-1) witht the pulsed cold neutron small angle scattering instrument at National Laboratory for High Energy Physics. At very early stage, scattering function at the high q side is not only proportional to q-2, q-4 and q-6, but it obeys non-integer power of q. The power changes continuously from q-1.5 or q-2 to q-6 in very short time. At the laste stage, the scattering function consists of q-4 and q-5 dependences. The very interesting results can not be satisfactorily explained by the existing theories. The phase separation at the very early stage takes place by the spinodal mechanism, but some deviations are observed from the linear spinodal theory. At the late stage, the dynamic scaling law proposed by Furukawa and Lebowitz describes well the experimental results

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