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Phase Transformations in ZrO_2 after Shock Loading

Sergey N.Kulkov Alexander G.Melnikov Institute of Strength Physics and Materials Science , The Russian Academy.of Science , Siberian Branch , Tomsk , 634055 , RussiaYanchun ZHOU Shengqi CHEN Zhe QU Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China

材料科学技术（英）

The effects of shock loading on the morphology,grain growth during heating and phase transforma- tion of ZrO_2 have been investigated.It is shown that shock loading may be efficiently used to modify submicron ceramic powders with nanocrystalline structure.After shock loading,the critical diameter of ZrO_2 particles transformed from tetragonal to monoclinic decreased due to stored strain energy. Annealing of powders resulted in reversible transformation to the tetragonal without considerable grain growth up to 1200℃.

关键词: submicron ceramics , null , null , null

Realization of Superplastic State of Polycrystals under Grain-boundary Diffusion

Yu.R.Kolobov and I.V.Ratochka(Institute of Strength Physics and Materials Science , Siberian Branch of the Russian Academy of Sciences , 634055 , Tomsk , Russia)

材料科学技术（英）

Creep behaviour of Mo and Fe polycrystals has been studied for a wide range of Strain rates in the presence of grain-boundary diffusion flux of Ni. The role of the impurity grain-boundary diffusion and grain-boundary migratin in the realization of the superplastic strain of metals under these conditions is examined

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Possible Phenomena of Stochastic Behaviour of Shear Deformed Aluminum

S.V.Alekseev S.G , Psakhie V.E.Panin Institute of Strength Physics and Materials Science of the Russian Academy of Sciences , Siberian Branch.Tomsk , 634055 , Russia

材料科学技术（英）

The influence of shear deformation on the behaviour of Mg and Zn impurities as well as self-interstitial atoms in Al was studied using molecular dynamics method.The profilies of potential relief were calculated in directions of possible migration of interstitials.It was found that under load- ing the location of interstitial atoms may be undefined.It means that the system of determined parti- cles may go into stochastic regime of behaviour.

关键词: stochastic behaviour , null , null

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