The model suggested by Ashby and Coble was used to analyze the sintering process of pure titanium in this paper. Then based upon this result, homogenizing behavior of alloying elements of aluminum and iron during sintering was further discussed for bio-titanium alloy Ti-5A1-2.5Fe. Using this method, the concentration variation of alloying elements was calculated to indicate the effect of element diffusion on the structure transformation. It was shown that the calculated results were in agreement with the results obtained in the previous experiments.
From cutting chips of 6061 aluminum alloy, recycled materials' plates were fabricated by extrusion and rolling. Three kinds of cutting chips, which were dry-cutting chips without cutting oil, wet-cutting chips with cutting oil and clean chips obtained by washing of the wet-cutting chips, were used for the recycling process. Moreover, non-recycled materials' plates which processed by the same extrusion and rolling using virgin materials of the same alloy as the case of the recycled materials were prepared for comparison. These four kinds of plates were characterized by carrying out ultimate analysis by fluorescent X-ray spectrometer and infrared absorption spectrometer, optical microscopic and SEM observation, tensile test, and corrosion test. Consequently, a significant difference in structures, tensile properties, and corrosion resistance was not recognized among three kinds of recycled materials, it became clear that cutting oil and detergent hardly influence the characteristics. Moreover, it was found that recycled materials had smaller crystal grain than that of non-recycled materials, and excelled in both strength and corrosion resistance. The conclusion that recycling of the cutting chips by extrusion and rolling was very promising in 6061 aluminum alloys was obtained.
SYNOPSIS Corrosion behavior plays a decisive role for biocompatibility of titanium alloy implants. In this study, Ti-5Al-2.5Fe alloy samples were formed through metal powder injection molding (MIM) process and their potentiodynamic tests were carried out in a phosphate buffered solution with and without HCl. Experimental results showed that the slope of current potential curves increased within the passive region. In comparison to results of samples processed by vacuum arc melting followed by annealing, existence of micro pores was considered to be a main factor for observed corrosion behavior of MIM processed sample. The observations were further discussed in detail based upon a model of electrochemical reaction system and quantitative equations for quasi-passive state.
Feature gene selection has significant impact on the performance of cell clustering in single-cell RNA sequencing (scRNA-seq) analysis. A well-rounded feature selection (FS) method should consider relevance, redundancy and complementarity of the features. Yet most existing FS methods focus on gene relevance to the cell types but neglect redundancy and complementarity, which undermines the cell clustering performance. We develop a novel computational method GeneClust to select feature genes for scRNA-seq cell clustering. GeneClust groups genes based on their expression profiles, then selects genes with the aim of maximizing relevance, minimizing redundancy and preserving complementarity. It can work as a plug-in tool for FS with any existing cell clustering method. Extensive benchmark results demonstrate that GeneClust significantly improve the clustering performance. Moreover, GeneClust can group cofunctional genes in biological process and pathway into clusters, thus providing a means of investigating gene interactions and identifying potential genes relevant to biological characteristics of the dataset. GeneClust is freely available at https://github.com/ToryDeng/scGeneClust.
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