Browsing NTNU Open by Author "Chen, Yongjun"
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Application of EBSD technique to ultrafine grained and nanostructured materials processed by severe plastic deformation: Sample preparation, parameters optimization and analysis
Chen, Yongjun; Hjelen, Jarle; Roven, Hans Jørgen (Journal article; Peer reviewed, 2012)With the help of FESEM, high resolution electron backscatter diffraction can investigate the grains/subgrains as small as a few tens of nanometers with a good angular resolution (∼0.5°). Fast development of EBSD speed (up ... -
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, ... -
Finite element analysis of strain distribution in ZK60 Mg alloy during cyclic extrusion and compression
Lin, Jinbao; Wang, Qudong; Liu, Manping; Chen, Yongjun; Roven, Hans Jørgen (Journal article; Peer reviewed, 2012)Finite element method was used to study the strain distribution in ZK60 Mg alloy during multi-pass cyclic extrusion and compression (CEC). In order to optimize the CEC processing, the effects of friction condition and die ... -
Microstructural heterogeneity in hexagonal close-packed pure Ti processed by high-pressure torsion
Chen, Yongjun; Li, Yanjun; Walmsley, John; Gao, N; Roven, Hans Jørgen; Starink, MJ; Langdon, TG (Journal article; Peer reviewed, 2012)Microstructural evolution was studied quantitatively by electron backscattering diffraction in commercial purity Ti processed by high-pressure torsion (HPT) at room temperature. The results show that a heterogeneous ... -
Microstructure and mechanical properties of Al-xMg alloys processed by room temperature ECAP
Chen, Yongjun; Chai, YC; Roven, Hans Jørgen; Subbarayan, Sapthagireesh; Yu, Yingda; Hjelen, Jarle (Journal article; Peer reviewed, 2012)Microstructure development and mechanical properties of Al–xMg alloys (x = 0, 1, 5–10 wt%), processed by ECAP at room temperature, have been investigated. The results show that the microstructures of Al–xMg alloys are ... -
Microstructure and texture characteristics of ZK60 Mg alloy processed by cyclic extrusion and compression
Lin, Jinbao; Wang, Qudong; Chen, Yongjun; Liu, Manping; Roven, Hans Jørgen (Journal article; Peer reviewed, 2010)The microstructure and crystallographic texture characteristics of an extruded ZK60 Mg alloy subjected to cyclic extrusion and compression (CEC) up to 8 passes at 503 K were investigated. The local crystallographic texture, ... -
Microstructure evolution of commercial pure titanium during equal channel angular pressing
Chen, Yongjun; Li, Yanjun; Walmsley, John C.; Dumoulin, S.; Skaret, Pål Christian; Roven, Hans Jørgen (Journal article; Peer reviewed, 2010)The microstructure development of commercially pure titanium during 3 and 4 passes of equal channel angular pressing (ECAP) has been investigated in detail by optical microscopy and electron backscattered diffraction (EBSD). ... -
Optimization of EBSD parameters for ultra-fast characterization
Chen, Yongjun; Hjelen, Jarle; Subbarayan, Sapthagireesh; Roven, Hans Jørgen (Journal article; Peer reviewed, 2012)Ultra-fast pattern acquisition of electron backscatter diffraction and offline indexing could become a dominant technique over online electron backscatter diffraction to investigate the microstructures of a wide range of ... -
Quantitative study of grain refinement in Al-Mg alloy processed by equal channel angular pressing at cryogenic temperature
Chen, Yongjun; Roven, Hans Jørgen; Subbarayan, Sapthagireesh; Skaret, Pål Christian; Hjelen, Jarle (Journal article; Peer reviewed, 2011)Strain induced grain refinement of an Al–1 wt.% Mg alloy processed by equal channel angular pressing (ECAP) at cryogenic temperature is investigated quantitatively. The results show that both mean grain and subgrain sizes ... -
Recycling of Aluminum Scrap by Severe Plastic Deformation
Cui, Jirang; Guo, Wei; Roven, Hans Jørgen; Wang, Qudong; Chen, Yongjun; Peng, Tao (Journal article; Peer reviewed, 2011)The production of primary aluminum is an energy costly process. With the global warming being of concern, the secondary aluminum stream is becoming an even more important component of aluminum production and is attractive ...