Blar i NTNU Open på forfatter "Roven, Hans Jørgen"
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Corrosion Fatigue of Extruded AA6082 Aluminium Alloy - The effects of Surface Roughness: Machined, Punched, and Counter Trimmed Surfaces
Lindstad, Gaute Tomassen (Master thesis, 2017)The aim of this master s thesis is to investigate the corrosion fatigue properties of an extruded AA6082 alloy. Surface roughness deeply affects fatigue and corrosion fatigue. Surface roughness depends on the shaping ... -
Cryogenic temperature deformation behaviour of two Al-Mg-Si alloys
Xu, Zebing (Doctoral theses at NTNU;2017:11, Doctoral thesis, 2017)A comprehensive study was carried out to clarify the effects of cryogenic temperature on mechanical properties and microstructure of two peak-aged Al-Mg-Si profiles, i.e., fully recrystallized AA6060 and fibrous AA6082. ... -
Deformation behavior, microstructure evolution, and dynamic recrystallization mechanism of an AZ31 Mg alloy under high-throughput gradient thermal compression
Lin, Boyu; Zhang, Hua; Meng, Yunpeng; Wang, Lifei; Fan, Jianfeng; Zhang, Shangzhou; Roven, Hans Jørgen (Peer reviewed; Journal article, 2022)A high-throughput gradient thermal compression process was adopted to investigate the effects of thermal deformation parameters on the deformation behavior and microstructure evolution of a rolled AZ31 Mg alloy. The results ... -
Deformation defects and electron irradiation effect in nanostructured Al-Mg alloy processed by severe plastic deformation
Liu, Manping; Sun, Shaochun; Roven, Hans Jørgen; Yu, Yingda; Zhang, Zhen; Murashkin, Maxim; Valiev, Ruslan Z. (Journal article; Peer reviewed, 2012)In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation ... -
Degreasing of aluminum turnings and implications for solid state recycling
Cui, Jirang; Kvithyld, Anne; Roven, Hans Jørgen (Chapter, 2010)With the global warming being of concern, recycling of aluminum by new solid-state recycling techniques instead of conventional remelting and subsequent refining processing has been taken into account. Solid-state recycling ... -
Depth profiling at a steel-aluminum interface using slow-flow direct current glow discharge mass spectrometry
Paudel, Gagan; Langelandsvik, Geir; Khromov, Sergey; Arbo, Siri Marthe; Westermann, Ida; Roven, Hans Jørgen; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2021) -
Development of Al-TiC Wire Feedstock for Additive Manufacturing by Metal Screw Extrusion
Langelandsvik, Geir; Grandcolas, Mathieu; Skorpen, Kristian Grøtta; Furu, Trond; Akselsen, Odd Magne; Roven, Hans Jørgen (Peer reviewed; Journal article, 2020)The development of customised aluminium alloys for welding and additive manufacturing (AM) is proposed to solve several quality issues and to enhance the mechanical integrity of components. The introduction of ceramic grain ... -
DSC analyses of static and dynamic precipitation of an Al-Mg-Si-Cu aluminum alloy
Liu, Manping; Wu, Zhenjie; Yang, Rui; Wei, Jiangtao; Yu, Yingda; Skaret, Pål Christian; Roven, Hans Jørgen (Journal article; Peer reviewed, 2015)In the present investigation, both static and dynamic precipitations of an Al–Mg–Si–Cu aluminum alloy after solid-solution treatment (SST) were comparatively analyzed using differential scanning calorimetry (DSC). Dynamic ... -
Effect of cryorolling on microstructure and mechanical properties of a peak-aged AA6082 extrusion
Xu, Zebing; Liu, Manping; Jia, Zhihong; Roven, Hans Jørgen (Journal article; Peer reviewed, 2017)Peak-aged AA6082 flat extrusions were cryorolled at liquid nitrogen temperature to three different thickness reductions, the reductions were 21%, 42% and 85%, respectively. Microstructure and plastic deformation behaviors ... -
The effect of Equal Channel Angular Pressing on the stress corrosion cracking susceptibility of AZ31 alloy in simulated body fluid
Peron, Mirco; Skaret, Pål Christian; Fabrizi, Alberto; Varone, Alessandra; Montanari, Roberto; Roven, Hans Jørgen; Ferro, Paolo; Berto, Filippo; Torgersen, Jan (Peer reviewed; Journal article, 2020)Despite the great potential of Mg and its alloys as material for biodegradable implants, their low resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use. Stress ... -
Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates
Meng, Yunpeng; Lin, Boyu; Wang, Lifei; Fan, Jianfeng; Zhang, Shangzhou; Lu, Liwei; Roven, Hans Jørgen; Zhang, Hua (Peer reviewed; Journal article, 2022)The AZ31/GW103K bimetallic composite plates were prepared by co-extrusion of different combination types (sandwich extrusion type and double semicircle extrusion type), and effects of different extrusion combination types ... -
Effect of Mg on microstructure and mechanical properties of Al-Mg alloys produced by high pressure torsion
Liu, Yang; Liu, Manping; Chen, Xuefei; Cao, Yang; Roven, Hans Jørgen; Maxim, Murashkin; Valiev, Ruslan Z.; Zhou, Hao (Journal article; Peer reviewed, 2019)Al-Mg alloys are a series of low cost and low density Al alloys, which show remarkable strengthening during deformation. In this work, study of commercial purity Al, Al-0.5Mg and Al-4.1Mg alloys was carried out to investigate ... -
Effect of Zr and Er on the microstructure, mechanical and electrical properties of Al-0.4Fe alloy
Kong, Yaping; Jia, Zhihong; Liu, Zhipeng; Liu, Manping; Roven, Hans Jørgen; Liu, Qing (Peer reviewed; Journal article, 2021)The effect of Zr and Er on the microstructure, electrical conductivity and mechanical properties of Al-0.4Fe alloy was investigated using optical microscope (OM), scanning electron microscope (SEM), electron back-scattered ... -
Effects of cryogenic temperature and pre-stretching on mechanical properties and deformation characteristics of a peak-aged AA6082 extrusion
Xu, Zebing; Roven, Hans Jørgen; Jia, Zhihong (Journal article; Peer reviewed, 2017)Plastic deformation studies of a peak-aged AA6082 alloy by means of tensile tests at 77 K and 295 K, and related microstructure characteristics obtained by Scanning Electron Microscopy (SEM), Electron Backscatter Diffraction ... -
Effects of iron precipitation and novel metal screw extrusion on electrical conductivity and properties of AA1370 aluminium
Langelandsvik, Geir; Furu, Trond; Reiso, Oddvin; Roven, Hans Jørgen (Journal article; Peer reviewed, 2020)In order to develop well-performing aluminium electrical conductors, the role of iron and processing method on electrical and mechanical properties was studied for an AA1370 alloy. Firstly, Ø3 mm cold drawn wires were ... -
Elektriske ledere av skrueekstrudert aluminium - Effekt av kjemisk sammensetning, termo-mekanisk bearbeiding og deformasjon
Ebbesen, Lasse Holm (Master thesis, 2016)Skrueekstrudering av aluminium er en ny og unik metode for å oppnå kontinuerlig ekstrudering av aluminium. Det er veldig aktuelt å kunne utnytte restaluminium fra produksjonsindustrien eller resirkulert skrap til noe ... -
Enhanced ductility and strength in a cast Al–Mg alloy with high Mg content
Liu, Zhibo; Sun, Jiani; Yan, Zhigang; Lin, Yaojun; Liu, Manping; Roven, Hans Jørgen; Dahle, Arne K. (Journal article; Peer reviewed, 2021)Cast Al–Mg alloys with high Mg content have attracted considerable interest as a result of exceptionally low mass density and enhanced Mg solid-solution strengthening effect. However, poor ductility in this class of cast ... -
Exploring glow discharge mass spectrometry applications in materials characterization
Paudel, Gagan (Doctoral theses at NTNU;2021:232, Doctoral thesis, 2021)Glow discharge mass spectrometry (GDMS) relying on continuous direct current discharge source coupled to sector field mass analyzer (SF-GDMS) is popular for its ability to detect impurities in sub-ppb level. Astrum GDMS ... -
Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing
Li, Yanjun; Chen, Yongjun; Walmsley, John C.; Mathiesen, Ragnvald; Dumoulin, S; Roven, Hans Jørgen (Journal article; Peer reviewed, 2010)The boundary structure of {1011} deformation twins formed in commercial pure titanium (CP-Ti) during the initial pass ECAP processing has been studied by TEM and HRTEM. A new twining mode with twinning dislocation of b3/3, ... -
Fatigue of Extruded AA6082 and AA7108 Alloys - The Effects of Natural Ageing Compared to Artificial Ageing
Brynjulfsen, Marte (Master thesis, 2015)Heat treatable aluminium alloys might have the potential to gain unexpected increase in mechanical properties when stored at room temperature (natural ageing) after extrusion, for long periods of time. The main aim of the ...