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INFLUENCE OF Al ON DUCTILITY IMPROVEMENT BY B IN Ni_3Al ALLOYS

YANG Wenying LU Fanxiu ZHANG Shouhua University of Science and Technology Beijing , Beijing , China Department of Materials Science and Engineering , University of Science and Technology Beijing , Beijing , 100083 , China

金属学报(英文版)

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 was confirmed by the positron annihilation technique.Therefore,the influence of Al content on the enhancing behaviour of B towards the ductility of Ni_3Al alloys can be understood by the interaction of non-stoiehiometric vacancies and B atoms.

关键词: Intermetallic compounds , null , null

ISOTHERMAL SECTION AT 1000 AND 1100℃ OF Fe-Mn-Al PHASE DIAGRAM

LIU Xingjun HAO Shiming SUN Rongyao Northeast University of Technology , Shenyang , China Department of Materials Science and Engineering , Northeast University of Technology , Shenyang 110006 , China

金属学报(英文版)

Phase equilibria at Fe-Mn side of isothermal section at 1000 and 1100℃ in Fe-Mn- Al system have been determined using the diffusion couple technique and metallography. A three-phase,α+γ+β,region was found at 1000℃.The method of solid/gas diffusion couple used to determine equilibrium phase composition is believed to be feasible for the system containing volatile component.

关键词: Fe-Mn-Al system , null , null

MECHANISM OF DEUTERIUM CRACKING IN PALLADIUM

SUN Dalin LEI Yongquan CHEN Yanglin WU Jing WANG Qidong Zhejiang University , Hangzhou , China Department of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

After 290 h electrochemical charging of deuterium,the density of dislocation in well-annealed Pd was increased from 10~8/cm~2 to over 10~12/cm~2 and a large amount of bubble-like voids or cracks was observed by optical and transmission electron microscopes.The mechanism of deuterium cracking is believed due to the formation of molecular De during the segregstion and combination of deuterium atoms around dislocations.XRD results showed that the lattice constant of Pd increased from 0.3890 nm to 0.4034 nm.

关键词: deuterium cracking , null

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