Search Results - "Mathiesen, Ragnvald H."

Microstructure evolution and mechanical behavior of a binary Al–7Mg alloy processed by equal-channel angular pressing by Zha, Min, Li, Yanjun, Mathiesen, Ragnvald H., Bjørge, Ruben, Roven, Hans J.

“…Achieving high strength and uniform deformation simultaneously in Al alloys processed by severe plastic deformation (SPD) remains a challenging task as these…”
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Revealing internal flow behaviour in arc welding and additive manufacturing of metals by Aucott, Lee, Dong, Hongbiao, Mirihanage, Wajira, Atwood, Robert, Kidess, Anton, Gao, Shian, Wen, Shuwen, Marsden, John, Feng, Shuo, Tong, Mingming, Connolley, Thomas, Drakopoulos, Michael, Kleijn, Chris R., Richardson, Ian M., Browne, David J., Mathiesen, Ragnvald H., Atkinson, Helen. V.

“…Internal flow behaviour during melt-pool-based metal manufacturing remains unclear and hinders progression to process optimisation. In this contribution, we…”
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Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP by Jia, Hailong, Bjørge, Ruben, Marthinsen, Knut, Mathiesen, Ragnvald H., Li, Yanjun

“…With the aim to improve the strength of potential Pb-free Al-Bi based bearing alloys, an Al-6Bi-8Zn alloy was subjected to equal channel angular pressing…”
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X-ray radiography observations of columnar dendritic growth and constitutional undercooling in an Al–30wt%Cu alloy by Mathiesen, Ragnvald H., Arnberg, Lars

“…In situ synchrotron X-ray radiography of columnar dendritic and eutectic growth under directional solidification of Al–30wt%Cu has been carried out with…”
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In situ hard X-ray transmission microscopy for material science by Falch, Ken Vidar, Casari, Daniele, Di Michiel, Marco, Detlefs, Carsten, Snigireva, Anatoly, Snigireva, Irina, Honkimäki, Veijo, Mathiesen, Ragnvald H.

“…Hard X-ray transmission microscopy based on refractive X-ray optics can be employed as a tool in material science to investigate buried-in microstructures in…”
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The real-time, high-resolution x-ray video microscopy of solidification in aluminum alloys by Arnberg, Lars, Mathiesen, Ragnvald H.

“…The solidification direction in Figures 1 and 2 was parallel to gravity. In experiments where columnar crystals grew upward, antiparallel to gravity, the…”
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In situ X-ray ptychography imaging of high-temperature CO2 acceptor particle agglomerates by Høydalsvik, Kristin, Bø Fløystad, Jostein, Zhao, Tiejun, Esmaeili, Morteza, Diaz, Ana, Andreasen, Jens W., Mathiesen, Ragnvald H., Rønning, Magnus, Breiby, Dag W.

“…Imaging nanoparticles under relevant reaction conditions of high temperature and gas pressure is difficult because conventional imaging techniques, like…”
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Mesoscopic Simulation of Dendritic Growth Observed in X-ray Video Microscopy During Directional Solidification of Al–Cu Alloys by Delaleau, Pierre, Beckermann, Christoph, Mathiesen, Ragnvald H., Arnberg, Lars

“…A mesoscopic model is developed to simulate microstructures observed in situ by X-ray video microscopy during directional solidification of Al–Cu alloys in a…”
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Growth kinetics of primary Si particles in hypereutectic Al-Si alloys under the influence of P inoculation: Experiments and modelling by Xu, Yijiang, Deng, Yun, Casari, Daniele, Mathiesen, Ragnvald H., Liu, Xiangfa, Li, Yanjun

“…A quantitative study on the growth kinetics of primary Si particles (PSPs), especially under the effect of P inoculation, during isothermal melt solidification…”
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Rochelle salt – a structural reinvestigation with improved tools. I. The high-temperature paraelectric phase at 308 K by Mo, Frode, Mathiesen, Ragnvald H., Beukes, Jon Are, Vu, Khanh Minh

“…The crystal structure of the high-temperature paraelectric phase of Rochelle salt (K + ·Na + ·C 4 H 4 O 6 2− ·4H 2 O) at 308 K has been reinvestigated using…”
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In-situ X-radiographic study of nucleation and growth behaviour of primary silicon particles during solidification of a hypereutectic Al-Si alloy by Xu, Yijiang, Deng, Yun, Casari, Daniele, Mathiesen, Ragnvald H., Li, Yanjun

“…Real-time observation of structure evolution in a hypereutectic Al-Si(-Cu) alloy under near-isothermal melt solidification condition was conducted by using…”
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Prominent role of multi-scale microstructural heterogeneities on superplastic deformation of a high solid solution Al–7Mg alloy by Zha, Min, Zhang, Hongmin, Jia, Hailong, Gao, Yipeng, Jin, Shenbao, Sha, Gang, Bjørge, Ruben, Mathiesen, Ragnvald H., Roven, Hans J., Wang, Huiyuan, Li, Yanjun

“…•The superplastic response is studied in an Al–7Mg alloy with multi-scale microstructural heterogeneities.•The Al–7Mg exhibits enhanced thermal stability and…”
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Revealing the nucleation kinetics of primary Si particles in hypereutectic Al–Si alloys under the influence of P inoculation by Xu, Yijiang, Deng, Yun, Casari, Daniele, Mathiesen, Ragnvald H., Liu, Xiangfa, Li, Yanjun

“…A quantitative study on the kinetics of nucleation of primary Si particles (PSPs), especially under the effect of P inoculation, during isothermal melt…”
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The charge density of urea from synchrotron diffraction data by Birkedal, Henrik, Madsen, Dennis, Mathiesen, Ragnvald H., Knudsen, Kenneth, Weber, Hans-Peter, Pattison, Philip, Schwarzenbach, Dieter

“…The charge density of urea is studied using very high precision single‐crystal synchrotron‐radiation diffraction data collected at the Swiss–Norwegian Beam…”
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High ductility bulk nanostructured Al–Mg binary alloy processed by equal channel angular pressing and inter-pass annealing by Zha, Min, Li, Yanjun, Mathiesen, Ragnvald H., Bjørge, Ruben, Roven, Hans J.

“…Bulk nanostructured (NS) metallic materials usually have high strength but extremely low ductility. In this study, we successfully prepared a bulk NS binary…”
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Achieve high ductility and strength in an Al-Mg alloy by severe plastic deformation combined with inter-pass annealing by MIN ZHA, YANJUN LI, MATHIESEN, Ragnvald H, BJØRGE, Ruben, ROVEN, Hans J

“…Metallic materials processed by severe plastic deformation generally possess very high strength but a rather low uniform elongation, usually <5%. In the…”
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In-situ evidence for impurity-induced formation of eutectic colonies in an interdendritic liquid by Wang, Yeqing, Gao, Jianrong, Chao, Paul, Muyanja, Nancy S., Mathiesen, Ragnvald H., Shahani, Ashwin J.

“…Eutectic colony formation in near-eutectic alloys is often attributed to independent nucleation of eutectic grains on the surface of primary dendrites. In this…”
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Analytical transmission cross-coefficients for pink beam X-ray microscopy based on compound refractive lenses by Falch, Ken Vidar, Detlefs, Carsten, Snigirev, Anatoly, Mathiesen, Ragnvald H.

“…•Analytical expression for chromatic transmission cross‐coefficients is presented.•Analytical expression for optimal numerical aperture is…”
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Nebula: reconstruction and visualization of scattering data in reciprocal space by Reiten, Andreas, Chernyshov, Dmitry, Mathiesen, Ragnvald H.

“…Two‐dimensional solid‐state X‐ray detectors can now operate at considerable data throughput rates that allow full three‐dimensional sampling of scattering data…”
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X-Ray Video Microscopy Studies of Irregular Eutectic Solidification Microstructures in Al–Si–Cu Alloys by Mathiesen, Ragnvald H., Arnberg, Lars, Li, Yanjun, Snigirev, Anatoly, Snigireva, Irina, Dahle, Arne K.

“…In-situ studies of Al–Si eutectic growth has been carried out for the first time by X-ray video microscopy during directional solidification of Al–Si–Cu alloys…”
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