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The “order-disorder” model was adopted to calculate the lattice vacancies related to the com-position change in Ni_3Al alloys.A great deal of vacancies,i.e.,the non-stoichiometric vacan-cies,may exist in the Ni_3Al alloys containing Al over stoichiometry,i.e.25 at.-%.This wasconfirmed by the positron annihilation technique.Therefore,the influence of Al content on theenhancing behaviour of B towards the ductility of Ni_3Al alloys can be understood by theinteraction of non-stoiehiometric vacancies and B atoms.
The “order-disorder” model was adopted to calculate the lattice vacancies related to the com-position change in Ni_3Al alloys. A great deal of vacancies, ie, the non-stoichiometric vacancies, may exist in the Ni_3Al alloys containing Al over stoichiometry, ie25 at .-%. This wasconfirmed by the positron annihilation technique. Before, the influence of Al content on the behavior charge of B towards the ductility of Ni_3Al alloys can be understood by theinteraction of non-stoiehiometric vacancies and B atoms.