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您的检索式：作者名="Guillermo Requena"
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| 1 | Thermal expansion behaviour of aluminum matrix composites with densely packed SiC particles显示文摘 | TRAN HUU NAM GUILLERMO REQUENA PETER DEGISCH- ER | 2008 | Composites:Part A2008，39，： | 1 |
| 2 | Hydrogen-based direct reduction of iron oxide at 700℃:Heterogeneity at pellet and microstructure scales显示文摘Steel production causes a third of all industrial CO_(2) emissions due to the use of carbon-based substances as reductants for iron ores,making it a key driver of global warming.Therefore,research efforts aim to replace these reductants with sustainably produced hydrogen.Hydrogen-based direct reduction(HyDR)is an attractive processing technology,given that direct reduction(DR)furnaces are routinely operated in the steel industry but with CH_(4) or CO as reductants.Hydrogen diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based reductants.However,the net reduction kinetics in HyDR remains extremely sluggish for high-quantity steel production,and the hydrogen consumption exceeds the stoichiometrically required amount substantially.Thus,the present study focused on the improved understanding of the influence of spatial gradients,morphology,and internal microstructures of ore pellets on reduction efficiency and metallization during HyDR.For this purpose,commercial DR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical probing.Revealing the interplay of different phases with internal interfaces,free surfaces,and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HyDR. | Yan Ma Isnaldi R.Souza Filho Xue Zhang Supriya Nandy Pere Barriobero-Vila Guillermo Requena Dirk Vogel Michael Rohwerder Dirk Ponge Hauke Springer Dierk Raabe | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，10： | 1 |
| 3 | Thermal expansion behavior of aluminum matrix composites with densely packed SiC particles 显示文摘 | Tran Huu Nam Guillermo Requena Peter Degischer | 2008 | Composite2008，39，： | 1 |
| 4 | Microstructure and mechanical behavior of similar butt-joints of ZK60 and ZK60-1.5RE magnesium alloys produced by linear friction stir welding显示文摘The microstructure and mechanical properties of butt-joints produced by linear friction stir welding of similar plates of as-cast ZK60 and modified ZK60 with 1.5 wt.%RE(ZK60-1.5 RE)are investigated.The thermomechanical affected zone is investigated in both advancing and retrieving sides,and the microstructure is compared to the base metal and the stirred zone.Electron backscattered diffraction measurements provide the average microstructural features of the transformed microstructure.The mechanical properties are assessed using hardness,tensile testing,and surface residual stress measured using X-ray diffraction.Higher torque and heat input are obtained for the ZK60-1.5 RE compared to the ZK60.The thermomechanical affected zone is notably larger for the ZK60 compared to the ZK60-1.5 RE.A gradient microstructure is formed in thermomechanical affected zones where deformed grains are progressively more recrystallised towards the stirred zone.There is no visible interface between the thermomechanical affected zone and the stirred zone.A fine and partially recrystallised microstructure is formed in the stirred zone.The retrieving side of the ZK60-1.5 RE has a slightly more refined microstructure compared to the other investigated zones.Anisotropy measured with increment in the maximum intensity of the(0001)increases towards to stirred zone.The formed microstructure is correlated with the role of twinning,recovery,static,and dynamic recrystallisation that can occur during friction stir welding.Twinning and grains with large misorientation spread are more pronounced in the thermomechanical affected zone and regions towards the base metal.Sharp low angle grain boundaries are observed towards the stirred zone.From refined recrystallised grains decorating the grain in the thermomechanical affected zone,a mosaic-like of low and high angle grain boundaries are observed in the stirred zone.The joints have comparable surface residual stresses.The friction stir welding improved the ductility and strength of the as-cast ZK60-1.5 RE alloy since the tensile samples fractured in the BM. | Erenilton Pereira da Silva Ricardo Henrique Buzolin Ulises Alfaro Guillermo Requena Haroldo Calvalcanti Pinto | 2021 | Journal of Magnesium and Alloys2021，9，5： | 0 |
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