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Microstructural characterization of internal oxidation of AgCu alloy

Science China(Technological Sciences) 1997年第2期40卷 156-163页

作者：彭晓李铁藩吴维 平德海 State Key Laboratory for Corrosion and Protection of Metals Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China Laboratory of Atomic Imaging of Solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The internal oxidation of AgCu alloys with atomic percentage 0.8,3 3, 6 3 and 9 5 of Cu in air at 750℃ and 850℃ has been studied. It was found that CuO particles precipitated homogeneously on the surface of AgCu alloys except for Ag-9.5% (atomic percentage) Cu. The latter exhibited the agglomerated precipitation of CuO particle cluster on the surface. The experimental results also revealed that the nucleation and growth of CuO oxide evidently varied with the change of Cu contents or oxidation temperature. When both Cu content and exposure temperature were low, the precipitation and the growth of internal CuO oxide were consistent with the prediction by the classical Bohm-Kahlweit mode, but the abnormal phenomenon of nucleation and growth of the CuO oxide was observed when the Cu content or the exposure temperature was increased. As a result of investigation of the atomic structure of different internally oxidized AgCu alloys, it is proposed that the stacking fault tetrahedra(SFT), which were found in the oxidized alloys, promoted the nucleation of CuO internal oxide.

关键词： AgCu alloy internal oxidation microstructure stacking fault tetrahedron.

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A SET OF SYMMETRIC QUADRATURE RULES ON TRIANGLES AND TETRAHEDRA

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Journal of Computational Mathematics 2009年第1期27卷 89-96页

作者： Linbo Zhang Tao Cui Hui Liu LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

We present a program for computing symmetric quadrature rules on triangles and tetrahedra. A set of rules are obtained by using this program. Quadrature rules up to order 21 on triangles and up to order 14 on tetrahedra have been obtained which are useful for use in finite element computations. All rules presented here have positive weights with points lying within the integration domain.

关键词： Finite element Numerical integration Quadrature Cubature Triangle tetrahedron.

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