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Microstructure of Al-Ti-B-Er refiner and its grain refining performance
Journal of Rare Earths, 2013Abstract Al-Ti-B-Er refiner was successfully prepared by CR (contact reaction process), a process based on SHS (self propagating high-temperature synthesis). The microstructure of the alloy was studied by optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive spectrometry.
Tengfei MA +3 more
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Microstructure Refinement and Crack Initiation in the Forging Process
Advanced Materials Research, 2014In this paper, the type and morphology of defects in heavy ingots were detected mainly on the basis of experimental results, which were obtained by metallographic analysis of the materials dissected from one 380 ton 30Cr2Ni4MoV ingot. Then the evolution of typical defects in the forging process was investigated at temperatures ranging from 900°C to ...
Wen Long Zhao, Qing Xian Ma
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Highly Refined Microstructures in Devitrified Alloys
MRS Proceedings, 1995AbstractThe formation of nanosized microstructures from controlled devitrification of amorphous alloys is reviewed. The driving force for copious nucleation of crystals is discussed in terms of thermodynamic models for the free energy of crystallization and for the interfacial free energy. After fast nucleation and growth of crystals to nanometric size,
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Microcrystalline Materials and Microstructure Refining
1992SP deformation is a result of the macroscopic influence of grain boundaries on the properties of polycrystalline materials. Hence, it can be assumed that the refining of microstructure is accompanied by both quantitative and, probably, qualitative changes in the structure of these materials.
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Deformation of microstructurally refined cast Ti46Al8Nb and Ti46Al8Ta
Intermetallics, 2012Abstract The response to deformation of samples of cast Ti46Al8Ta and Ti46Al8Nb alloys, which had been heat treated to produce similar refined microstructures, has been investigated; the refinement increases the ductility from about 0.2% found in cast HIPped samples to 0.5% for the Nb-containing alloy and up to 1.5% for the Ta-containing alloy.
M.H. Loretto +5 more
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Microstructure refinement of a TiAl alloy by beat treatment
Materials Science and Engineering: A, 2000Abstract In order to refine the as-cast microstructure of a TiAl based alloy with a grain size of ∼1000 μm, a multiple-stage heat treatment was carried out and a fine fully lamellar microstructure (FFL) with a grain size of 10–20 μm was obtained. This treatment route includes pretreatment in the single α field, cyclical treatment and aging in the α+γ
Yong Wang +3 more
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Directional Solidification and Microstructural Refinement of Immiscible Alloys
Metallurgical and Materials Transactions A, 2008The directional solidification has been carried out for Al-9, 12Bi, and Al-3.4Bi-2.5Si (wt pct) alloys in a Bridgman apparatus with a transversal magnetic field. The microstructure of the alloy samples solidified at different melt superheat (MS) temperatures and magnetic field strengths has been observed.
Jie He +4 more
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Refinement of Microstructure in Steels through Thermomechanical Processing
Advanced Materials Research, 2010The refinement of microstructure is the most generally accepted approach to simultaneously improve the strength and toughness in steels. In the current study, the role of dynamic/static phase transformation on the ferrite grain refinement was investigated using different thermomechanical processing routes. A Ni-30Fe austenitic model alloy was also used
Hossein Beladi +3 more
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Microstructural refinement in Al–Mg2Si in situ composites
Journal of Materials Science Letters, 1999brunel univ, dept mat engn, uxbridge ub8 3ph, middx, england. chinese acad sci, inst met res, shenyang 110015, peoples r china.;zhang, j (reprint author), brunel univ, dept mat engn, uxbridge ub8 3ph, middx ...
J. Zhang, Z. Fan, Y. Wang, B. Zhou
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Microstructural refinement of a superalloy by progressive induction melting
High Temperature Technology, 1989AbstractThe microstructure of a nickel-based superalloy has been refined by a progressive induction melting technique. The control on heating rate was achieved by manipulating the melt stock position with respect to the induction furnace coils and by regulating the power supply to the furnace.
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