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Direct Generation of Intense Compression Waves in Molten Metals by Using a High Static Magnetic Field and Their Application

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Journal of Materials Science & Technology 2003年第1期19卷 5-9页

作者： QiangWANG SATORUKAWAI 等 KeyLaboratoryofNationalEducationMinistryforElectromageneticProcessingofMaterials NortheasternUniversityShenyang110004China departmentofmaterialsprocessingengineering NagoyaUniveris

Compression waves propagating through molten metals are contributed to degassing, accelerating reaction rate,removing exclusions from molten metals and refining solidification structures during metallurgical processing of materials. In the present study, two electromagnetic methods are proposed to generate intense compression wavesdirectly in liquid metals. One is the simultaneous imposition of a high frequency electrical current field and a staticmagnetic field; the other is that of a high frequency magnetic field and a static magnetic field. A mathematical modelbased on compressible fluid dynamics and electromagnetic fields theory has been developed to derive pressure distributions of the generated waves in a metal. It shows that the intensity of compression waves is proportional to thatof the high frequency electromagnetic force. And the frequency is the same as that of the imposed electromagneticforce. On the basis of theoretical analyses, pressure change in liquid gallium was examined by a pressure transducerunder various conditions. The observed results approximately agreed with the predictions derived from the theoreticalanalyses and calculations. Moreover, the effect of the generated waves on improvement of solidification structureswas also examined. It shows that the generated compression waves can refine solidification structures when they wereapplied to solidification process of Sn-Pb alloy. This study indicates a new method to generate compression wavesby imposing high frequency electromagnetic force locally on molten metals and this kind of compression waves canprobably overcome the difficulties when waves are excited by mechanical vibration in high temperature environments.

关键词： High static magnetic field Compression wave Electromagnetic processing of materials Maeneto-hvdrodvnamics. Solidification process

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Experimental Study and Finite Element Polycrystal Model Simulation of the Cold Rolling Textures in a Powder Metallurgy Processed Pure Aluminum Plate

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Journal of Materials Science & Technology 2005年第2期21卷 148-154页

作者： LiqingCHEN NaoyukiKanetake InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China//DepartmentofMaterialsProcessingEngineeringSchoolofEngineeringNagoyaUniversityFuro-choChikusa-kuNagoya464-8603Japan departmentofmaterialsprocessingengineering SchoolofEngineeringNagoyaUniversityFuro-choChikusa-kuNagoya464-8603Japan

Ingot metallurgy (IM) aluminum has long been the subject and attracted the attention of many metallurgists and textural researchers of materials. Due to the introduction of large amounts of ex situ interfaces, however, the textures in powder metallurgy (PM) processed aluminum has been rarely reported. In this article, a pure aluminum plate was prepared via PM route. The starting billet was first produced with uni-axially cold compaction and flat hot-extrusion and then followed by cold rolling processes. The hot-extruded and cold rolling deformation textures of the pure PM aluminum at 50%, 80% and 90% cold rolling reductions were studied by orientation distribution functions (ODFs) analysis. The finite element polycrystal model (FEPM) was finally utilized to simulate the cold rolling textural evolution at various stages of cold rolling. In FEPM simulation, the initial hot-extruded textures were taken into account as inputs. The results showed that typical β-fiber texture formed in pure PM aluminum with the cold rolling reduction increased till 80%, and there was not much change after excessive cold rolling deformation. Homogeneous slip is not the only deformation mode in PM processed pure aluminum plate at over 80% cold rolling reduction. The experimental results were qualitatively in good agreement with the simulated ones.

关键词： Texture Cold rolling Aluminium Finite element polycrystal model (FEPM) Powder metallurgy

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