Shen R.,Nanjing Southeast University |
Shen R.,Jiangyin Product Quality Supervision and Testing Institute |
Chen F.,Nanjing Southeast University |
Yu X.,Nanjing Southeast University |
And 3 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2015
The new meta-stable β titanium alloy Ti-35Nb-3.7Zr-1.3Mo-xO was designed according to the d-electron design theory. The influence of oxygen content on its microstructure and mechanical properties was investigated. It is indicated that β phase is the principal phase after solution treatment, and the grains are refined gradually with the increase of oxygen content. A small amount of α″ phase is observed in the alloys with low oxygen content. Thermal α″ phase transformation is suppressed by the addition of oxygen. β phase is still the principal phase after cold working while its crystallinity decreases due to the increase of defects by deformation. Needle-like α″, plate-like ω, zig-zag twin and stress induced α″ martensite are observed in cold worked alloys with different oxygen contents. The ultimate tensile strength (UTS), elastic modulus and hardness increase and plasticity decreases with the increase of oxygen content. The addition of 0.1%O results in an increase of UTS by about 100 MPa, and the addition of 0.3%O results in an increase of Vickers-hardness by about 50. The average elastic moduli of the alloys with different oxygen contents are between 45 to 75 GPa. When the oxygen content exceeds 0.6%, the plasticity of the alloy deteriorates significantly. ©, 2015, Southeast University. All right reserved.
Lai X.,Southern Medical University |
Lai X.,South China University of Technology |
Feng X.,South China University of Technology |
Feng X.,Jiangyin Product Quality Supervision and Testing Institute |
And 6 more authors.
Journal of Nanoparticle Research | Year: 2015
Ag/Ag2S heterojunction nanowires (HJNWs) have been successfully fabricated through one-pot solution-phase method, which were transferred into Ag/CdS HJNWs by cation exchange. The synthesis involved a template-less, non-seed, and one-pot solution-phase process to high-quality Ag/Ag2S HJNWs. The sizes, positions, and spacing distances between the Ag2S or CdS NPs of the growing Ag2S and CdS NPs in the Ag/Ag2S and Ag/CdS HJNWs could be finely tailored by reaction temperatures and PVP concentrations. By varying reaction temperature, the sizes and positions (tip or surface) of the growing Ag2S and CdS NPs in the Ag/Ag2S and Ag/CdS HJNWs could be effectively controlled while PVP concentration could tailor the sizes and spacing distances between the Ag2S or CdS NPs of the growing Ag2S and CdS NPs in the Ag/Ag2S and Ag/CdS HJNWs. We also proposed a primary experimental model to illustrate the growth mechanism of the Ag/Ag2S and Ag/CdS HJNWs.Graphical Abstract: [Figure not available: see fulltext.] © 2015, Springer Science+Business Media Dordrecht.
Feng X.-M.,Jiangyin Product Quality Supervision and Testing Institute |
Li Y.,Jiangyin Product Quality Supervision and Testing Institute |
Lu X.-B.,Jiangyin Product Quality Supervision and Testing Institute |
Chen J.,Jiangyin Product Quality Supervision and Testing Institute
Yejin Fenxi/Metallurgical Analysis | Year: 2015
In oder to find posible elements in sample, the sample was qualitatively analyzed using the UniQuant software without correction. The scanning of analytical lines for all elements was conducted to determine the type and approximate content of elements in sample. Then, copper and iron in zinc alloy were determined using single-point calibration curve under the optimal instrumental conditions, realizing the determination of copper and iron in zinc alloy by X-ray fluorescence spectrometry (XRF). The effect of analytical time, detector, analytical line and sample preparation method on the determination results was investigated. The results indicated that the sensitivity and precision of testing elements were high under the following conditions: the analytical time was 60 s, the FPC detector was used, and the Kα line was selected as the analytical line. The milled block samples of zinc alloy and slice samples which were prepared by pressing the powder of ship shape samples and boric acid for direct analysis. The determination results were basically consistent with those obtained by electrolytic method and ICP-AES. The relative standard deviation (RSD, n=6) was 0.29% and 1.9%, respectively. The range was 0.016% and 0.0008%, which was lower than the repeatability limit specified in current national standard method. ©, 2015, Central Iron and Steel Research Institute. All right reserved.