Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science
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#1Elango Chandiran (Tohoku University)H-Index: 3
#2Naoya Kamikawa (Hirosaki University)H-Index: 6
Last. Tadashi Furuhara (Tohoku University)H-Index: 57
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This work investigates the effect of increasing both martensite phase and ferrite phase strength on tensile properties and fracture behavior of dual-phase (DP) steels. The martensite phase strength is varied by changing its carbon contents and tempering process, whereas the ferrite phase strength is varied by dispersion of nano-sized vanadium carbides (VC) precipitates in the ferrite phase and also by changing its total fraction in DP samples. It is found that strengthening of the martensite pha...
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#1H. Kamali (CSM: Colorado School of Mines)H-Index: 1
#2Michael J. Kaufman (CSM: Colorado School of Mines)H-Index: 67
Last. Amy J. Clarke (CSM: Colorado School of Mines)H-Index: 24
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Electron microscopy revealed continuous and discontinuous precipitation of κ-Co3AlC0.5 in a Co-10Al-3Cu-1C (at. pct) alloy during aging at 500 °C, 850 °C, and 900 °C. The kinetics of the discontinuous reaction at 500 °C are sluggish. Increasing the temperature increases the kinetics significantly, due to the exponential increase in the Al grain boundary diffusivity. However, the kinetics at 900 °C are slower than those at 850 °C, due to a significant decrease in the driving force.
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Deformation twinning and dislocation slip in twinning-induced plasticity (TWIP) steels have been shown to depend strongly on the crystal orientation, yet the underlying mechanism is still unclear. Here, we addressed this question by fabricating single crystal micro-pillars with six different crystal orientations in a coarse-grained TWIP steel sample and then conducting compression tests as well as microstructural characterization in these pillars. Depending on the crystal orientation, either twi...
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#1Yong Wang (WUST: Wuhan University of Science and Technology)H-Index: 4
#2Honghong Wang (WUST: Wuhan University of Science and Technology)H-Index: 4
Last. Huijun Li (UCINF: University Ucinf)H-Index: 58
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An ultra-low carbon bainitic steel is developed through nanoprecipitation of high-density Mn/Fe-rich intermetallic B2-NiAl. A high yield strength of ~ 1.3 GPa and a good total elongation of ~ 13 pct are attained via minimal lattice misfit nanoprecipitation. Atom probe tomography and high-resolution transmission electron microscope were applied to characterize nanoscale precipitates. An increment of 544 MPa in yield strength is achieved after an aging process, predominantly attributed to the orde...
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#1Brian Welk (OSU: The Ohio State University)H-Index: 10
#2Nevin Taylor (OSU: The Ohio State University)
Last. Hamish L. Fraser (OSU: The Ohio State University)H-Index: 75
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This paper addresses the use of alloying additions to titanium alloys for additive manufacturing (AM) with the specific objective of producing equiaxed microstructures. The additions are among those that increase freezing ranges such that significant solutal undercooling results when combined with the rapid cooling rates associated with AM, and so be effective in inducing a columnar-to-equiaxed transition (CET). Firstly, computational thermodynamics has been used to provide a simple graphical me...
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The influence of the severe plastic deformation via high-speed high-pressure torsion (HSHPT) on the structural and magnetic properties of the Zr13Co87 alloys is investigated. Moderate applied deformation promotes the growth of the rhombohedral hard magnetic phase leading to the increase of the sample’s hardness and magnetic coercivity. A higher degree of deformation affects the samples morphology leading to a critical value of the grain size under which the exchange coupling of the soft phase is...
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#1Vickey Nandal (IITD: Indian Institute of Technology Delhi)H-Index: 2
#2Bushra Harun (IITD: Indian Institute of Technology Delhi)
Last. Suresh Neelakantan (IITD: Indian Institute of Technology Delhi)H-Index: 7
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Sequential transformation in precipitate structure from L12 → B2-NiAl precipitate has been observed for Al0.5Co1.5CrFeNi1.5 alloy with the increase in aging temperature. At 650 °C, the FCC matrix contained L12 precipitates (γ′), which were transformed into ordered B2 structure precipitate at 750 °C. A coarser and more stable B2-NiAl rich precipitate has been observed for higher aging temperature (850 °C). This transformation is attributed to the higher thermodynamic stability of B2-NiAl precipit...
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#1O. F. Ogunbiyi (TUT: Tshwane University of Technology)H-Index: 9
#2Rotimi Sadiku (TUT: Tshwane University of Technology)H-Index: 25
Last. J. Fayomi (TUT: Tshwane University of Technology)H-Index: 5
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The effects of the addition of different percentage compositions of graphene nanoplatelets (GNPs) to a nickel-based superalloy were investigated in this study. A spark plasma sintering (SPS) method was employed in the development of the nickel-based alloy/composites, and the developed bulk nickel-based alloy and its composites were from high-purity micron-size powder. Subsequently, the microstructure and mechanical properties (i.e., microhardness and tensile yield strength) were examined. The SP...
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#1Rachel White (SNL: Sandia National Laboratories California)
#2Zahra N. Ghanbari (SNL: Sandia National Laboratories California)H-Index: 2
Last. Daniel Perry (SNL: Sandia National Laboratories California)H-Index: 5
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A survey of cadmium plated field return hardware showed ubiquitous cadmium whisker growth. The most worn and debris-covered hardware showed the densest whisker growth. Whiskers were often found growing in agglomerates of nodules and whiskers. The hardware was rinsed with alcohol to transfer whiskers and debris from the hardware to a flat stub. Fifty whiskers were studied individually by scanning electron microscopy (SEM), including energy dispersive spectroscopy (EDS) and electron backscatter di...
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