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- 저자 : Shuiqing Liu (검색결과 2 건)
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Fabrication of the Ti5Si3/Ti Composite Inoculants and Its Refining Mechanism on Pure Titanium
Nuo Li,Chunxiang Cui,Shaungjin Liu,Long Zhao,Shuiqing Liu 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
The in situ Ti5Si3/Ti inoculants were successfully prepared by vacuum arc-melting and melt-spinning method. An efficient route by adding a small quantity of Ti5Si3/Ti inoculants to Ti melt has been first proposed tomodify the coarse grains of as cast microstructure of pure titanium in this paper. It was found that themicrostructure of ribbon inoculants was cellular structure that composed of Ti5Si3 and α-Ti phases. Thegrain refining effect of the inoculants was significantly improved with the adding ratio range from 0.2% to0.5% in weight. With the increase of addition amount of inoculants on Ti melt, the tensile strength, yieldstrength and microhardness of pure titanium are significantly improved except elongation. The excellentgrain refining effect can be attributed to the heterogeneous nucleation of the titanium grain on the precipitatedTi5Si3 phases in the Si-rich regions and the constitutional supercooling of Si in the Si-poverty regions. It issuggested that the in situ Ti5Si3/Ti inoculants is a promising inoculants for titanium alloys.
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Anthocyanins in Tree Peony (Paeonia suffruticosa) and Their Relationship with Flower Color
Yanzhao Zhang,Yan Zhang,Xujia Duan,Xin Liu,Shuiqing Yuan,Jianming Han,Yanwei Cheng 한국원예학회 2020 원예과학기술지 Vol.38 No.6
Flower color is an important trait of tree peony (Paeonia suffruticosa), an economically important species. The accurate classification of flower color and understanding of the mechanism involved in creating variations in flower color provide the basis of tree peony breeding and genetic research. This study used the International Commission of Illumination Color System, known as CIELAB or CIE L<SUP>*</SUP>a<SUP>*</SUP>b<SUP>*</SUP>, to measure the flower color of 150 cultivars of the Zhongyuan cultivar group of tree peony. Hierarchical cluster analysis and visual observations were used to divide this cultivar group into five major color lines: white, pink, red, purple, and fuchsia. The brightness (L<SUP>*</SUP>) of the flower color gradually decreased with an increase in anthocyanin content. The redness (a<SUP>*</SUP>) of the flower color was significantly negatively correlated with total anthocyanin (TA) content in the fuchsia line but was positively correlated with TA in the remaining four color lines. Six types of anthocyanins, including Cy3G, Cy3G5G, Pn3G, Pn3G5G, Pg3G, and Pg3G5G, were mainly found in the Zhongyuan cultivar group by liquid chromatography except in the white line. Stepwise regression analysis showed that Pg3G5G had a significant positive correlation with redness of flower color. Cy3G5G and Pn3G5G had a significant positive correlation with redness in pink, red, and purple color lines. However, Pn3G was negatively correlated with redness in the fuchsia line. This study lays the foundation for further development of new breeds and flower colors in tree peony and for genetic research related to flower color.
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