Influence of boron content on boride characteristics in cast Ti-45Al-2Mn-2Nb-xB alloys
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The morphology and crystal structure of borides in Ti-45Al-2Mn-2Nb-xB (at.%) alloys containing different amount of B have been investigated to reveal the relationship between B content and boride formation. In alloys containing 0.25 at.% and 0.5 at.% B, boride particles are curved and flake-like, and are distributed at β dendrite boundaries, resulting from late nucleation and constrained by matrix during growth. Curved, ribbon-like boride particles are observed to randomly distribute in alloy containing 0.75 at.% B, and insufficient behind-time supply of B atoms to the growth front is believed to be responsible for their irregularity and large curvature bending and branching. In alloys containing 1.0 at.% or higher B, straight needle/rod-like boride particles dominate, and a small number of blocky particles appear in alloys containing 1.25 at.% and 1.5 at.% B. Most boride particles are of C32-TiB2 and have their major axes along [0001] or [12¯10] in all alloys studied in this work, and Bf-TiB and D7b-Ti3B4 randomly appear in conjunction with C32-TiB2 to form intergrowths, while B27-TiB particles are free standing and only appear in alloys containing 1 at.% or higher B.Keywords:
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In this research, we study the electronic properties of two pure graphene ribbon and their adducts by adding the Al / N compound. We showed that the electronic softness of the pure Graphene Ribbon was increased with increasing the thickness of the Ribbon, adding the Al / N atoms leads to decrease the electronic softness. The electrochemical hardness has inversely behavior to the softness. Increasing the thickness of the Graphene Ribbon leads to decrease the forbidden energy gap of the Ribbon, but the energy gap is increase due to the addition of the Al / N atoms in the Ribbon
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Porperties of Fe-0.77C-B alloy with different boron contant was investigated in order to understand the effect of boron on properties of Fe-0.77C-B alloy.The results show that the hardness of the alloy increases while its toughness decreases with the addtion of boron when the alloy solidifies in sand mould.This effect is also observed after the Fe-0.77C-B alloy is normalized under 1 000 ℃.And the properties of the Fe-0.77C-B alloy contained 2.23% boron is equivalent to the properties of KmTBCr12 alloy after it is normalized.
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Ultrasonic ribbon bonding has gained much attention due to the endeavor of achieving higher module performance in power electronic packaging. Among all the ribbon materials, Ag ribbon is a promising candidate due to its superior electrical properties. However, research which has reported the bonding of the ribbon on chip side is scant. Thus, in this study, the authors carried out bonding of the Ag ribbon on various types of metallized wafers to examine the feasibility of Ag ribbon, simulating the bonding scenario on the chip side in power modules. Results revealed that bonding of the Ag ribbon is feasible on those wafers metallized Ag on top. The authors also discussed the implications for the bondability of Ag ribbon with different types of metallization layers.
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Ribbon formation in the single roller process was investigated to establish the casting process for ultra-wide ribbon. Observations of castings by photographs indicated that a melt puddle was formed between the nozzle and the wheel surface, and a ribbon was produced on the wheel surface. The thickness of the ribbon obtained was about 50 μm and this value was much smaller than the height of the melt puddle. Furthermore, the effect of the height and the length in the casting direction of the melt puddle on ribbon thickness was examined. The ribbon thickness was dependent on the length of the melt puddle in the casting direction, i.e., as the length of the melt puddle increased, the ribbon thickness increased. On the other hand, the ribbon thickness was independent of the height of the melt puddle. From the results of the present examinations, it is important to make the length of the melt puddle in the casting direction uniform across the width of the ribbon in order to obtain ultra-wide ribbon with uniform thickness.
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A morphological evolution of the growth of Fe2B boride on steel substrate has been investigated using two dimensional (2D) multi-phase-field (MPF) simulations. In order to evaluate competitive growth between boride seeds during the coating process, variations on boride seed orientation have been implemented. In addition, in order to have anisotropy growth of boride, anisotropy of interfacial energy is considered on the evaluation of phase-field evolution. It was observed that boride seed with structure orientation of 90° shows a preferential growth as compared with the growth of boride seeds at other orientations. On the other hand, competitive growth between boride seeds at different crystal orientations can also be observed, where boride seeds approaching a preferential orientation angle grow faster and suppress the growth of boride seeds at the lower orientation angle. Both of these present observations agree with previous experimental observations that boride seeds tend to grow perpendicular to the substrate surface and the growth of boride seeds in this direction suppress growth in other directions. Additionally, it was observed that the preferential growth of boride is independent of the initial size of the boride seed.
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The boriding of 4Cr5MoSiV1 steel was performed in the temperature range of 860°C–980 °C to examine the influence of boriding conditions on the boride layers. The experimental results show the formation of FeB and Fe2B layers with the predominant saw-tooth morphology. The boride layer depth increases with increase the boriding temperature and time. Thick and compact boride layers could be obtained at temperatures higher than 900 °C. The growth kinetics of boride layers is characterized by a parabolic curve. FeB and Fe2B exhibit a hardness of 1600HV0.1 and 1300HV0.1, respectively, which is 4 and 3 times that of the substrate. A diffusion model, based on the boron concentration profiles of the surface layers and the parabolic growth law, was established to predict the growth kinetics of the boride layers including both the FeB and the Fe2B layer. A satisfactory agreement between the model and experimental results was obtained. The work thus provides an approach to investigate and to predict the boride layer growth of 4Cr5MoSiV1 steel in the boriding process.
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