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Journal Articles

Deformation mechanism of a strong and ductile maraging steel investigated using ${it in situ}$ X-ray synchrotron diffraction

Li, H.*; Liu, Y.*; Zhao, W.*; Liu, B.*; Tominaga, Aki; Shobu, Takahisa; Wei, D.*

International Journal of Plasticity, 165, p.103612_1 - 103612_20, 2023/06

 Times Cited Count:0 Percentile:81.79(Engineering, Mechanical)

In order to clarify the strength properties of Co-free maraging steel, ${it in situ}$ tensile experiment using high energy synchrotron X-ray diffraction was performed. Diffraction profiles from the martensitic and austenitic phases were obtained, and their strength and width were observed to vary as loading. Analysis of the diffraction profiles showed that the content of martensite in the as-aged material decreased slowly at low stress levels and decreased rapidly at high stress levels. On the other hand, the austenite phase in the as-solution materials was significantly transformed the martensite phase as the stress increased. It was clarified to be responsible for their respective strength properties.

Journal Articles

Si-addition contributes to overcoming the strength-ductility trade-off in high-entropy alloys

Wei, D.*; Gong, W.; Tsuru, Tomohito; Lobzenko, I.; Li, X.*; Harjo, S.; Kawasaki, Takuro; Do, H.-S.*; Bae, J. W.*; Wagner, C.*; et al.

International Journal of Plasticity, 159, p.103443_1 - 103443_18, 2022/12

 Times Cited Count:12 Percentile:98.45(Engineering, Mechanical)

Journal Articles

Mechanical behaviors of equiatomic and near-equiatomic face-centered-cubic phase high-entropy alloys probed using ${it in situ}$ neutron diffraction

Wei, D.*; Gong, W.; Tsuru, Tomohito; Kawasaki, Takuro; Harjo, S.; Cai, B.*; Liaw, P. K.*; Kato, Hidemi*

International Journal of Plasticity, 158, p.103417_1 - 103417_17, 2022/11

 Times Cited Count:13 Percentile:97.88(Engineering, Mechanical)

Journal Articles

Multiscale constitutive modeling of additively manufactured Al-Si-Mg alloys based on measured phase stresses and dislocation density

Zhang, X. X.*; Knoop, D.*; Andr$"a$, H.*; Harjo, S.; Kawasaki, Takuro; Lutz, A.*; Lahres, M.*

International Journal of Plasticity, 140, p.102972_1 - 102972_20, 2021/05

 Times Cited Count:21 Percentile:94.86(Engineering, Mechanical)

Journal Articles

FCC metal-like deformation behaviour of Ir$$_3$$Nb with the L1$$_2$$ structure

Okamoto, Norihiko*; Takemoto, Shohei*; Chen, Z. M. T.*; Yamaguchi, Masatake; Inui, Haruyuki*

International Journal of Plasticity, 97, p.145 - 158, 2017/10

 Times Cited Count:10 Percentile:50.15(Engineering, Mechanical)

Journal Articles

Crystal plasticity modeling and simulation considering the behavior of the dislocation source of ultrafine-grained metal

Aoyagi, Yoshiteru*; Tsuru, Tomohito; Shimokawa, Tomotsugu*

International Journal of Plasticity, 55, p.43 - 57, 2014/04

 Times Cited Count:38 Percentile:86.85(Engineering, Mechanical)

UFGMs with a grain size less than 1 $$mu$$m exhibits remarkable material and mechanical properties, and a computational model predicting these properties is desired in the field of materials science and engineering. When grains are of the submicron order, dislocation loops are hardly generated from Frank-Read sources smaller than the grain size. In this study, we develop a crystal plasticity model considering the effect of the grain boundary and dislocation source. We thoroughly investigate the effect of dislocation behavior on the material properties of UFGMs.

Journal Articles

Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning

Aoyagi, Yoshiteru*; Kobayashi, Ryotaro*; Kaji, Yoshiyuki; Shizawa, Kazuyuki*

International Journal of Plasticity, 47, p.13 - 28, 2013/08

 Times Cited Count:25 Percentile:71.53(Engineering, Mechanical)

In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out pseudo-three-dimensional FE-FD hybrid simulation for severe compression of FCC polycrystal using the present model. Some processes of ultra fine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundaries are numerically reproduced, and we investigate the effect of dislocation behavior on the processes of ultrafine-graining.

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