Inelasticity and Precipitation of Germanium
from a Solid Solution in AlGe Binary Alloys

B. K. Kardashev, B. N. Korchunov, S. P. Nikanorov*, and V. N. Osipov

Ioffe Physical-Technical Institute, Russian Academy of Sciences,
Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia

* e-mail: s.nikanorov@mail.ioffe.ru

Received January 21, 2015

Abstract—The influence of precipitation of germanium atoms in a solid solution on the dependence of the
inelasticity characteristics on the germanium content in aluminum–germanium alloys prepared by directional
crystallization has been studied. It has been shown that the Young’s modulus defect, the amplitude-dependent
decrement, and the microplastic flow stress at a specified cyclic strain amplitude have extreme values at the
eutectic germanium content in the alloy. The eutectic composition of the alloy undergoes a ductile–brittle tran-
sition. It has been found that there is a correlation between the dependences of the Young’s modulus defect,
amplitude-dependent decrement, microplastic flow stress, and specific entropy of the exothermal process of
germanium precipitation on the germanium content in the hypoeutectic alloy. The concentration dependences
of the inelasticity characteristics and their changes after annealing have been explained by the change in the
resistance to the motion of intragrain dislocations due to different structures of the Guinier–Preston zones
formed during the precipitation of germanium atoms.

DOI: 10.1134/S1063783415080090

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