Formation of a Gradient Structure in a Material by Twist Extrusion

2020 ◽  
Vol 2020 (5) ◽  
pp. 573-578
Author(s):  
O. V. Prokof’eva ◽  
Y. Y. Beygelzimer ◽  
V. V. Usov ◽  
N. M. Shkatulyak ◽  
T. S. Sovkova ◽  
...  
Keyword(s):  
Gradient Structure ◽  
Twist Extrusion

scholarly journals Obtaining hexagon-shaped billets of copper with gradient structure by twist extrusion

2019 ◽  
Vol 153 ◽  
pp. 215-223 ◽  
Author(s):  
Viet Q. Vu ◽  
O. Prokof'eva ◽  
L.S. Toth ◽  
V. Usov ◽  
N. Shkatulyak ◽  
...  
Keyword(s):  
Gradient Structure ◽  
Twist Extrusion

scholarly journals Corrosion Behavior and Osteogenic Activity of a Biodegradable Orthopedic Implant Mg–Si Alloy with a Gradient Structure

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 781
Author(s):  
Weiyan Jiang ◽  
Wenzhou Yu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Gradient Structure ◽  
Orthopedic Implant ◽  
Biological Functions ◽  
Alloy Matrix ◽  
Osteogenic Activity

A gradient Mg-8 wt % Si alloy, which was composed of the agglomerated Mg2Si crystals coating (GMS8-1) and the eutectic Mg–Si alloy matrix (GMS8-2), was designed for biodegradable orthopedic implant materials. The bio-corrosion behavior was evaluated by the electrochemical measurements and the immersion tests. The results show that a significant improvement of bio-corrosion resistance was achieved by using the gradient Mg–Si alloy, as compared with the traditional Mg-8 wt % Si alloy (MS8), which should be attributed to the compact and insoluble Mg2Si phase distributed on the surface of the material. Especially, GMS8-1 exhibits the highest polarization resistance of 1610 Ω, the lowest corrosion current density of 1.7 × 10−6 A.cm−2, and the slowest corrosion rate of 0.10 mm/year. In addition, GMS8-1 and GMS8-2 show better osteogenic activity than MS8, with no cytotoxicity to MC3T3-E1 cells. This work provides a new way to design a gradient biodegradable Mg alloys with some certain biological functions.

scholarly journals Atomic Gradient Structure Alters Electronic Structure in 3D across the Bulk and Enhances Photoactivity

2021 ◽  
pp. 2003548
Author(s):  
Peng Ren ◽  
Zexi Lu ◽  
Miao Song ◽  
Jaewon Lee ◽  
Jian Zheng ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Gradient Structure

scholarly journals Genetic recombination as a generalised gradient flow

2021 ◽  
Author(s):  
Frederic Alberti
Keyword(s):  
Arbitrary Number ◽  
Genetic Recombination ◽  
Reaction Network ◽  
Gradient Flow ◽  
Mass Action ◽  
Gradient System ◽  
Gradient Structure ◽  
Law Of Mass Action ◽  
Reversible Chemical Reaction ◽  
Time Partitioning

AbstractIt is well known that the classical recombination equation for two parent individuals is equivalent to the law of mass action of a strongly reversible chemical reaction network, and can thus be reformulated as a generalised gradient system. Here, this is generalised to the case of an arbitrary number of parents. Furthermore, the gradient structure of the backward-time partitioning process is investigated.

Effect of stacking fault energy on deformation mechanisms in Cu and Cu-30% Zn alloy with gradient structure obtained by SMAT

2021 ◽  
Vol 865 ◽  
pp. 158863
Author(s):  
Xiaomin Liu ◽  
Masashi Nakatani ◽  
Hongliang Gao ◽  
Bhupendra Sharma ◽  
Hongjiang Pan ◽  
...  
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Deformation Mechanisms ◽  
Gradient Structure ◽  
Zn Alloy
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