X-ray energy disperslve analyses sbow that the rati0 of titanium to potassium in the interlayer ismuch higher than that of the whlsker K,o.6TlO,, and that titanium and p0tassium atoms of the whisker arepartly diss0lve...X-ray energy disperslve analyses sbow that the rati0 of titanium to potassium in the interlayer ismuch higher than that of the whlsker K,o.6TlO,, and that titanium and p0tassium atoms of the whisker arepartly diss0lved into the matrix AI near the whisker. The lnterrace residual strains in the composite are determined in terms of the shifts of HOLZ llnes. To unlqueIy evaluate the Iattlce parameters and the lattice strainsfrom an experimentaI HOLZ line pattern, the pIane stress approximation is employed to reduce the numberof adjustable parameters in the optimization procedure. The results obtained with this method are in goodagreement with other works. The possible expIanations for the high von Mises effective stresses in the matrixnear the whisker are discussed.展开更多
Based on the basic operating principal and the technology characteristic of electron beam physical vapor deposition(EBPVD) technique, EBPVD was used to prepare the micro-layer composites. The effect on the substrate p...Based on the basic operating principal and the technology characteristic of electron beam physical vapor deposition(EBPVD) technique, EBPVD was used to prepare the micro-layer composites. The effect on the substrate preheating temperature was taken into accounts and the finite element analysis package ANSYS was used to simulate the internal stress field and the potential displacement changing tendency. The results show that one of the most important quality factors on the judgment of micro-layer composites is the adhesion between the substrate and the deposition layers as well as among the different deposition layers. Besides the existance of temperature gradient through the thickness of layers, the main reason for the internal stress in micro-layer composites is the mismatch of various properties of the layer and the substrate of different thermal expansions and crystal lattice types. With the increase of substrate preheating temperature, the inter-laminar shear stress also takes on a tendency of increase but the axial residual stress decrease.展开更多
文摘X-ray energy disperslve analyses sbow that the rati0 of titanium to potassium in the interlayer ismuch higher than that of the whlsker K,o.6TlO,, and that titanium and p0tassium atoms of the whisker arepartly diss0lved into the matrix AI near the whisker. The lnterrace residual strains in the composite are determined in terms of the shifts of HOLZ llnes. To unlqueIy evaluate the Iattlce parameters and the lattice strainsfrom an experimentaI HOLZ line pattern, the pIane stress approximation is employed to reduce the numberof adjustable parameters in the optimization procedure. The results obtained with this method are in goodagreement with other works. The possible expIanations for the high von Mises effective stresses in the matrixnear the whisker are discussed.
基金Project(50304007) supported by the National Natural Science Foundation of China
文摘Based on the basic operating principal and the technology characteristic of electron beam physical vapor deposition(EBPVD) technique, EBPVD was used to prepare the micro-layer composites. The effect on the substrate preheating temperature was taken into accounts and the finite element analysis package ANSYS was used to simulate the internal stress field and the potential displacement changing tendency. The results show that one of the most important quality factors on the judgment of micro-layer composites is the adhesion between the substrate and the deposition layers as well as among the different deposition layers. Besides the existance of temperature gradient through the thickness of layers, the main reason for the internal stress in micro-layer composites is the mismatch of various properties of the layer and the substrate of different thermal expansions and crystal lattice types. With the increase of substrate preheating temperature, the inter-laminar shear stress also takes on a tendency of increase but the axial residual stress decrease.
