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Start Over Author "Liu, Danhua" Topic microstructure
4 results on '"Liu, Danhua"'

1. Study on the microstructure and properties evolution of CuCrZr/316LN-IG explosion bonding for ITER first wall components

Author

Chen Jiming, Zhou Yi, Liu Danhua, Huang Pan, Li Qian, Yang Bo, Pinghuai Wang, and Jin Fanya

Subjects
Materials science, Scanning electron microscope, Annealing (metallurgy), Mechanical Engineering, Alloy, Recrystallization (metallurgy), 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Indentation hardness, 010305 fluids & plasmas, Explosion welding, Nuclear Energy and Engineering, 0103 physical sciences, Ultimate tensile strength, engineering, General Materials Science, Composite material, 0210 nano-technology, Civil and Structural Engineering
Abstract

In this study, CuCrZr/316L(N)-IG explosion bonding bimetallic plates were produced and conducted the same thermal cycles as the ITER enhanced heat flux (EHF) First Wall (FW) fingers. The bonding in different states was investigated using optical and scanning electron microscopy and tensile, hardness tests. Wavy morphology and deformation structure were observed in the as-received explosion bonding plates. After solution annealing, deformation feature disappeared and recrystallization of CuCrZr alloy happened. The plates can meet the design requirement for the EHF FW components after the following Be/CuCrZr HIPing, both for the microstructure and strength.

Published
2017

2. Effect of the ITER FW Manufacturing Process on the Microstructure and Properties of a CuCrZr Alloy

Author

Chen Jiming, Song Yi, Li Qian, Wang Pinghuai, and Liu Danhua

Subjects
Explosion welding, Materials science, Hot isostatic pressing, Metallurgy, Vickers hardness test, Ultimate tensile strength, Alloy, engineering, engineering.material, Ingot, Condensed Matter Physics, Microstructure, Hot pressing
Abstract

The first wall (FW) is one of the core components in ITER. As the heat sink material, the CuCrZr alloy shall be properly jointed with beryllium and stainless steel. At present, the grains of CuCrZr are prone to coarsen seriously in the thermal cycle process of FW manufacturing, which has become a critical issue for ITER parties. To investigate the mirostructure and mechanical properties of the optimized CuCrZr alloy in the first wall fabricating thermal cycle, simulative experiments have been done in this study. The alloy ingot was forged and hot rolled into plates, and then solid solution annealed, cold rolled and aged for strengthening. Several heat treatments were done to the CuCrZr samples, and the changes of microstructure, micro-hardness and tensile strength were investigated. The results indicated that the original elongated grains had changed into equiaxed ones, and the vickers hardness had declined to about 60 after experiencing the process of CuCrZr/316L(N) bi-metallic plate manufacturing, either by hot isostatic pressing at a higher temperature or by explosion welding followed by solution annealing. Joining Be/CuCrZr by hot isostatic pressing acts as an aging process for CuCrZr, so after the simulated heat treatment, the hardness of the alloy increased to about 110 HV and the tensile yield strength at 250°C rose to about 170 MPa. Meanwhile, the average grain size was controlled below 200 μm.

Published
2015

3. Effect of Polymer Permeability and Solvent Removal Rate on In Situ Forming Implants: Drug Burst Release and Microstructure.

Author

Zhang, Xiaowei, Yang, Liqun, Zhang, Chong, Liu, Danhua, Meng, Shu, Zhang, Wei, and Meng, Shengnan

Subjects
POLYMERS, DIMETHYL sulfoxide, MICROSTRUCTURE, ORGANIC solvents, POLYCAPROLACTONE, SOLUBILITY, PERMEABILITY
Abstract

To explore the mechanism of drug release and depot formation of in situ forming implants (ISFIs), osthole-loaded ISFIs were prepared by dissolving polylactide, poly(lactide-co-glycolide), polycaprolactone, or poly(trimethylene carbonate) in different organic solvents, including N-methyl-2-pyrrolidone (NMP), dimethyl sulfoxide (DMSO), and triacetin (TA). Drug release, polymer degradation, solvent removal rate and depot microstructure were examined. The burst release effect could be reduced by using solvents exhibit slow forming phase inversion and less permeable polymers. Both the drug burst release and polymer depot microstructure were closely related to the removal rate of organic solvent. Polymers with higher permeability often displayed faster drug and solvent diffusion rates. Due to high polymer-solvent affinity, some of the organic solvent remained in the depot even after the implant was completely formed. The residual of organic solvent could be predicted by solubility parameters. The ISFI showed a lower initial release in vivo than that in vitro. In summary, the effects of different polymers and solvents on drug release and depot formation in ISFI systems were extensively investigated and discussed in this article. The two main factors, polymer permeability and solvent removal rate, were involved in different stages of drug release and depot formation in ISFI systems. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Study on the microstructure and properties evolution of CuCrZr/316LN-IG explosion bonding for ITER first wall components.

Author

Wang, Pinghuai, Chen, Jiming, Li, Qian, Liu, Danhua, Huang, Pan, Jin, Fanya, Zhou, Yi, and Yang, Bo

Subjects
*COPPER-zirconium alloys, *CHROMIUM copper alloys, *NUCLEAR reactors, *TENSILE strength, *HEAT flux, *WELDING
Abstract

In this study, CuCrZr/316L(N)-IG explosion bonding bimetallic plates were produced and conducted the same thermal cycles as the ITER enhanced heat flux (EHF) First Wall (FW) fingers. The bonding in different states was investigated using optical and scanning electron microscopy and tensile, hardness tests. Wavy morphology and deformation structure were observed in the as-received explosion bonding plates. After solution annealing, deformation feature disappeared and recrystallization of CuCrZr alloy happened. The plates can meet the design requirement for the EHF FW components after the following Be/CuCrZr HIPing, both for the microstructure and strength. [ABSTRACT FROM AUTHOR]

Published
2017
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