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Solidification structures of high niobium containing TiAl alloys

Journal of University of Science and Technology Beijing 2005年第2期12卷 134-138页

作者： jingwenxu junpinlin yanliwang zhilin guoliangchen StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijing100083China

To understand the effect of alloy stoichiometry on the microstructural development and mechanical behavior of γ-TiAl- based materials, it is necessary to have a determination of the phase relationships for the TiAl alloy system near the γ phase field. Cast structures and phases of Ti-(43-47)Al-8Nb-(1-2)Mn (at%) alloys have been studied by using scanning electron microscope and X-ray diffraction. Their solidification path and microstructure development during the solidification were analyzed. The experimental results show that the alloys with different Al contents form different macrostructures and microstructural morphologies. This indi- cates that the solidification paths are different with different Al contents. The alloy with 43Al forms equiaxed grain structure, and the solidification path is as follows: L —? L+β —? β —? α+β —> α+β cores —> O2+γ+B2 cores. Whereas the alloy with 47Al forms colum- nar grain structure, and the solidification path is as follows: L —> L+β —? α+β+L —? α+γ+β cores —> tXj+γ+BZ cores. The p phase is their primary solid phase and can be retained to ambient temperature. The alloy with 43Al solidifies completely into β phase. The peritectic reactions L+P —> α and L+α-? γ appear when the Al content increases to 47Al.

关键词： high niobium titanium aluminides microstructure phase transformation β phase

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维普期刊数据库

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Deformation characterization of conductive particles in anisotropically conductive adhesive simulated by FEM

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Journal of University of Science and Technology Beijing 2005年第1期12卷 48-53页

作者： yanliwang junpinlin zhilin XinfaCui guoliangchen StateKeyLaboratoryforAdvancedMetals＆Materials UniversityofScienceandTechnologyBeijingBeijing100083China

The deformation behavior and the contact area of conductive particles in anisotropically conductive adhesives (ACA) were investigated by finite element method (FEM). The solid conductive particles are made of pure Ni and Cu. The results indicate that the deformation of the conductive particles is inhomogeneous during fabrication. When the reduction in height is small the deformation concentrates in the area near the contact area. As the reduction in height increases, the strain in the area near the contact area increases, and the metal flows toward the circumference, resulting in the increase of the contact area between the conductive particles and pad. The higher the degree of deformation, the larger the contact area. The regression equations were offered to express the relations between the bounding force and the contact area or the reduction in height. An approach of how to obtain the maximum contact area in ACA was discussed.

关键词： anisotropically conductive adhesive contact area of conductive particles in ACA finite element method

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维普期刊数据库

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Determination of plastic equation of state by indentation method on 304 stainless steel

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Journal of University of Science and Technology Beijing 2005年第2期12卷 151-154页

作者： yanliwang zhilin junpinlin XinfaCui guoliangchen StateKeyLaboratoryforAdvancedMetalandMaterials UniversityofScienceandTechnologyBeijingBeijing100083China

An indentation method for determining the plastic mechanical equation of state (PES) was studied. The constant loading rate and constant loading rate/load indentation tests were carried out. The method for determining the work-hardening coefficient and the strain rate sensitivity coefficient of PES were discussed in detail. 304 stainless steel hot-treated at 1100°C was used to verify the method. The work-hardening coefficient and strain rate sensitivity coefficient of 304 stainless steel were respectively determined as 0.30 and 0.015. These values are very close to those achieved by tensile tests. From the establishment of the PES of 304 stainless steel it is shown that the PES obtained by the indentation method is easier than that by the tensile test.

关键词： plastic equation of state 304 stainless steel work hardening coefficient strain rate sensitivity coefficient

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