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In situ microtomography investigation of microstructural evolution in Al-Cu alloys during holding in semi-solid state

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中国有色金属学会会刊：英文版 2010年第S3期20卷 734-738页

作者： S.TERZI L.SALVO m.suery A.DAHLE E.BOLLER Australian Research Council Centre of Excellence for Design in Light metals Materials EngineeringThe University of QueenslandBrisbane Queensland 4072Australia Université de Grenoble Science et Ingénierie des Matériaux et ProcédésGénie Physique et Mécanique des MatériauxUMR CNRS 5266Grenoble INPUniversité Joseph FourrierBP4638402 Saint-Martin d'Hères CedexFrance European Synchrotron Radiation Facility 6 rue Jules HorowitzBP22038043 Grenoble CedexFrance

The aim of this paper is to report the results of experiments carried out on Al-Cu alloys with different Cu contents,studying the microstructure evolution during holding in the semi-solid *** 3-D microstructure was observed by in situ X-ray microtomography carried out at ESRF Grenoble,*** variation of the solid-liquid interface area per unit volume during holding was *** addition,local observations show that two coarsening mechanisms of the solid particles occur simultaneously:dissolution of small particles to the benefit of larger ones by an Ostwald-type mechanism and the growth of necks between solid particles due to *** observations confirm that in situ X-ray tomography is a very powerful tool to study the microstructure evolution in the semi-solid state and the influencing mechanisms in real-time.

关键词： Al-Cu alloys microtomography remelting microstructure

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Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk metallic Glass

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Journal of materials Science & Technology 2003年第6期19卷 557-560页

作者： Q.WANG J.J.Blandin m.suery B.Van de moortele J.m.Pelletier GPm2 ENSPG D.U. B.P.46 38042 Grenoble France Institute of Materials Shanghai University Shanghai 200072 ChinaGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex France

The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystaltized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid.

关键词： Homogeneous plastic flow Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy,Partially crystallized amorphous alloy

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