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Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science 

About: Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science is an academic journal. The journal publishes majorly in the area(s): Microstructure & Alloy. Over the lifetime, 17076 publication(s) have been published receiving 497707 citation(s).
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Journal ArticleDOI
Abstract: Ceramic-ceramic composites have been prepared using the centrifugal slip casting method (CSC). The method has so far been mainly utilized in making ceramic-metal composites. Al2O3–ZrO2 composites have been obtained with different shares of ZrO2, i.e., 15, 50 and 75 vol pct, respectively. Prior to sintering the composite samples, the rheological properties of the casting slips were investigated and thermogravimetric tests were performed. Upon sintering, all three series of the ceramic composites showed a density close to 100 pct and no microcracks or delamination. Phase, microstructural and mechanical investigations were carried out to determine what effect the share of ceramics has on the composites produced. An increase in the share of ZrO2 in the Al2O3–ZrO2 composite leads to a reduction in the growth of Al2O3 grains and a decrease in the average hardness. Cross-sectional hardness testing of the composites showed no evident gradient in any of the samples. Life cycle analysis (LCA) results indicate that the further optimization of the composite formation process, including up-scaling, allows to obtain Al2O3–ZrO2-based pipes possessing more favorable environmental characteristics compared with materials conventionally used for linear infrastructure, which is important in light of the global transformation toward sustainable construction and the circular economy.

Journal ArticleDOI
H. R. Abedi1, O. A. Ojo1Institutions (1)
Abstract: The fusion zone (FZ) microstructure of a newly developed gas tungsten arc-welded cobalt-based superalloy called CoWAlloy1 is characterized. Elemental microsegregation leads to the formation of interdendritic micro-constituents, which are confirmed to include MC-type carbides and γ-γ' eutectics, as well as inhomogeneous precipitation of γ' within the FZ. The presence of the terminal solidification reaction products and inhomogeneous distribution of γ' in the FZ require appropriate consideration during the development of optimal post-weld heat treatment.

Journal ArticleDOI
Yadunandan Das1, Yadunandan Das2, Jianling Liu1, Hossein Ehteshami3  +5 moreInstitutions (4)
Abstract: Duplex stainless steels are a group of widely used stainless steels, because of their attractive combination of strength and corrosion resistance. However, these steels embrittle because of a phase separation phenomenon in the ferrite phase when exposed to temperatures within the miscibility gap. This manuscript investigates the phase separation in two commercial stainless steels, the duplex stainless steel (DSS) 22Cr-5Ni (2205 or UNS S32205), and the super-duplex stainless steel (SDSS) 25Cr-7Ni (2507 or UNS S32750), and its subsequent effect on mechanical property evolution. Long-term isothermal aging heat treatments were carried out at industrially relevant temperatures between 250 °C and 350 °C for up to 48,000 hours, and quantitative measurements of the amplitude and wavelength of the phase separated nanostructure were obtained using Small-Angle Neutron Scattering (SANS). These quantifications were used as input parameters in hardness models to predict the hardness evolution. It is concluded that the quantitative information from SANS combined with these hardness models enables the prediction of hardness evolution in DSS at low temperatures, which in turn correlates with the embrittlement of the DSS.

Journal ArticleDOI
Yong Wang1, Honghong Wang1, X. L. Wan1, Huigai Li2  +1 moreInstitutions (3)
Abstract: 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 order strengthening mechanism.

Journal ArticleDOI
Z. Y. Liang, Mingxin Huang1Institutions (1)
Abstract: 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 twinning or slip dominates the plastic deformation. The critical stresses for twinning and slip were measured to be 147.5 ± 19.2 and 105.4 ± 11.2 MPa, respectively. It is found that the Schmid factors for the leading and trailing partial dislocations on the primary slip plane play a crucial role in the competition between twinning and slip at different orientations. Besides, the occurrence of cross-slip depends on crystal orientation through the Schmid factors for the constriction of extended dislocation cores on the primary slip plane as well as those for cross-slip on the conjugate slip plane.

1 citations


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Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
2021480
2020552
2019525
2018579
2017561
2016622