Blar i NTNU Open på forfatter "Jia, Hailong"
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Accelerated recrystallization by electric current flash heating in cold-rolled Al-5Cu alloy under the influence of concurrent precipitation
Wang, Shubo; Jia, Hailong; Li, Yanjun (Journal article; Peer reviewed, 2019)The influence of flash heating by using a continuous direct current on the recrystallization behavior of an Al-5Cu alloy under the influence of concurrent precipitation of Al2Cu precipitates has been investigated. In ... -
Al-5Cu alloy processed by equal-channel angular pressing
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)An ECAP (equal channel angular pressing) processed UFG Al-5Cu alloy was characterized by electron backscatter diffraction (EBSD). It is revealed that a bimodal grain structure, i.e. ultrafine grains accompanied by micron-sized ... -
Dislocation behavior in a polycrystalline Mg-Y alloy using multi-scale characterization and VPSC simulation
Zhou, Bijin; Wang, Leyun; Jia, Hailong; Zeng, Xiaoqin; Li, Yanjun (Peer reviewed; Journal article, 2022)In this study, the dislocation behavior of a polycrystalline Mg-5Y alloy during tensile deformation was quantitatively studied by an in-situ tensile test, visco-plastic self-consistent (VPSC) modeling, and transmission ... -
Effect of soft Bi particles on grain refinement during severe plastic deformation
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)Two aluminum alloys, Al–8Zn and Al–6Bi–8Zn were subjected to equal channel angular pressing (ECAP) up to 5 passes at room temperature. The microstructural evolution and the grain refinement behavior of these alloys were ... -
Engineering grain boundary structures of aluminium alloys and titanium by high strain/ strain rate deformation
Jia, Hailong (Doctoral theses at NTNU;2018:139, Doctoral thesis, 2018)A comprehensive study was carried out to clarify the effects of severe plastic deformation (SPD) and high strain rate deformation on various aluminium alloys and commercial purity titanium. Equal channel angular pressing ... -
Formation of Σ3{110} incoherent twin boundaries through geometrically necessary boundaries in an Al-8Zn alloy subjected to one pass of equal channel angular pressing
Jia, Hailong; Jin, Shenbao; Li, Yanjun (Journal article, 2018)For coarse grained (CG) alloys with high stacking fault energies (SFEs), like aluminum, deformation twins can rarely form. Here, we report that Σ3{110} incoherent twin boundaries (ITBs) could be generated in a CG Al-8Zn ... -
High strength and ductile high solid solution Al-Mg alloy processed by a novel hard-plate rolling route
Zha, Min; Meng, Xiaotao; Zhang, Hongmin; zhang, Xuanhe; Jia, Hailong; Li, Yanjun; Zhang, Junyu; Wang, Huiyuan; Jiang, Qichuan (Journal article, 2017)Achieving bimodal grain structure via cold rolling remains a challenge for Al–Mg alloys. In the present work, a high tensile strength (∼525 MPa) and ductile (∼14%) Al–9Mg alloy was fabricated by a novel hard-plate rolling ... -
Prominent role of multi-scale microstructural heterogeneities on superplastic deformation of a high solid solution Al–7Mg alloy
Zha, Min; Zhang, Hongmin; Jia, Hailong; Gao, Yipeng; Jin, Shenbao; Sha, Gang; Bjørge, Ruben; Mathiesen, Ragnvald; Roven, Hans Jørgen; Wang, Hui-Yuan; Li, Yanjun (Peer reviewed; Journal article, 2021)Achieving high superplasticity in single-phase Al alloys remains a challenge, since the fine-grained structure required for superplastic deformation coarsens rapidly in the absence of dispersed second-phase particles during ... -
Quantifying the grain boundary segregation strengthening induced by post-ECAP aging in an Al-5Cu alloy
Jia, Hailong; Bjørge, Ruben; Cao, Lingfei; Hui, Song; Marthinsen, Knut; Li, Yanjun (Journal article, 2018)Hardening on annealing (HOA) has been frequently observed in nanostructured metals and alloys. For nanostructured materials obtained by severe plastic deformation (SPD), HOA has been attributed to the reduction of dislocation ... -
Revealing abnormal {11-21} twins in commercial purity Ti subjected to split Hopkinson pressure bar
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article, 2019)The deformation behavior of Ti alloys during conventional deformation, such as rolling and compression,have been extensively investigated, while it is less understood during high strain rate deformation. In thepresent work, ... -
Revealing slip-induced extension twinning behaviors dominated by micro deformation in a magnesium alloy
Zhou, Bijin; Wang, Leyun; Jin, Peipeng; Jia, Hailong; Roven, Hans Jørgen; Zeng, Xiaoqin; Li, Yanjun (Peer reviewed; Journal article, 2020)In this study, an in situ SEM/EBSD study on slip-induced extension twinning (S→T) behaviors of a Mg–Y alloy was conducted. It shows that the S→T process cannot be well explained using the classical geometrical compatibility ... -
The role of grain boundary plane in slip transfer during deformation of magnesium alloys
Zhou, Bijin; Li, Yanjun; Wang, Leyun; Jia, Hailong; Zeng, Xiaoqin (Peer reviewed; Journal article, 2022)Slip transfer across grain boundaries (GBs) is an important mechanism for HCP metals to accommodate intergranular deformation incompatibility. In this work, an in-situ SEM/EBSD study was conducted to study basal-slip-induced ... -
Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP
Jia, Hailong; Bjørge, Ruben; Marthinsen, Knut; Mathiesen, Ragnvald; Li, Yanjun (Journal article; Peer reviewed, 2017)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 (ECAP). To reveal the roles played by the soft Bi particles, an ... -
Texture evolution of an Al-8Zn alloy during ECAP and post-ECAP isothermal annealing
Jia, Hailong; Li, Yanjun (Journal article; Peer reviewed, 2019)In this work, the texture evolution of an Al-8 wt% Zn alloy during equal channel angular pressing (ECAP) and post-ECAP isothermal annealing was systematically investigated by electron backscatter diffraction (EBSD). Special ... -
The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy
Jia, Hailong; Bjørge, Ruben; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)An Al-5wt.%Cu alloy supersaturated with Cu in solid solution was subjected to equal channel angular pressing (ECAP). The microstructuralevolution was systematically investigated by backscattered electron (BSE)imaging, ... -
The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy
Jia, Hailong; Bjørge, Ruben; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)An Al-5 wt.% Cu alloy supersaturated with Cu in solid solution was subjected to equal channel angular pressing (ECAP). The microstructural evolution was systematically investigated by backscattered electron (BSE) imaging, ...