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| 1 | Effects of cooling rate on the fracture properties of TA15 ELI alloy plates显示文摘The effects of cooling rate on the mechanical properties and the fatigue crack growth behavior of TA15 ELI alloy plates with different microstructures were investigated at room temperature. The results indicate that the cooling rate (water quench, air cooling, and furnace cooling) has a pronounced influence on the mechanical properties and on the fatigue crack growth, especially for air cooling and furnace cooling. Optical microstructure observation and scanning electron microscopy of tensile fracture surfaces were performed to gain an insight into the mechanism of properties. The dependence of me-chanical properties and fatigue crack growth behavior on the cooling rate can be attributed to the α lamellae width and the α colony size, which induce the change in slip length. The microstructure produced by air cooling shows the best damage tol-erance behavior when compared with water quench and furnace cooling. | LI Shikai XIONG Baiqing HUI Songxiao | 2007 | Rare Metals2007，26，1： | 15 |
| 2 | Microstructure and tensile properties of low cost titanium alloys at different cooling rate显示文摘Titanium and titanium alloys have several advantages, but the cost of titanium alloys is very expensive compared with the traditional metal materials. This article introduces two new low-cost titanium alloys Ti-2.1Cr-1.3Fe (TCF alloy) and Ti-3Al-2.1Cr-1.3Fe (TACF alloy). In this study, we used Cr-Fe master alloy as one of the raw materials to develop the two new alloys. We introduce the microstructure and tensile properties of the two new alloys from β solution treated with different cooling methods. Optical microscopy (OM), X-ray diffractometry (XRD), and transmission electron microscopy (TEM) were employed to analyze the phase constitution, and scanning electron microscopy (SEM) was used to observe the fracture surfaces. The results indicate that the microstructures consist of β grain boundary and α′ martensite after water quenching (WQ), β matrix and α phase after air cooling (AC) and furnace cooling (FC), respectively. Also, the microstructure is the typical basketweave structures after FC. Of course, athermal ω is also observed by TEM after WQ. The strength increases with decreasing cooling rates and the plasticity is reversed. Because of the athermal ω, the strength and ductility are highest and lowest when the cooling method is WQ. The strength of TACF alloy is higher than the TCF alloy, but the plasticity is lower. The fracture surfaces are almost entirely covered with dimples under the cooling methods of AC and FC. Also, we observe an intergranular fracture area that is generated by athermal ω, although some dimples are observed after WQ. | Wang Guo Hui Songxiao Ye Wenjun Mi Xujun Wang Yongling Zhang Wenjing | 2012 | Rare Metals2012，31，6： | 8 |
| 3 | Mechanical properties and microstructure of an α+β titanium alloy with high strength and fracture toughness显示文摘The Ti-Al-Sn-Zr-Cr-Mo-V-Si (Ti-62A) alloy, an alpha-beta alloy with high strength and fracture toughness, is currently used as an advanced structural material in aerospace and non-aerospace applications. Thermo-mechanical processes can be used to optimize the relationship between its strength and fracture toughness. A Ti-62A alloy bar can be machined through a transus β-forged plus α+β solution treated and aged specimen with a lamellar alpha microstructure. The effects of heat treatment on the mechanical properties were discussed. Heat treatment provided a practical balance of strength, fracture toughness, and fatigue crack growth resistance. A comparison of the Ti-62A alloy with the Ti-62222S alloy under the same thermo-mechanical processing conditions showed that their properties are at the same level. | YU Yang HUI Songxiao YE Wenjun XIONG Baiqing | 2009 | Rare Metals2009，28，4： | 8 |
| 4 | Dynamic fracture toughness of TA15ELI alloy studied by instrumented impact test显示文摘The dynamic fracture toughness of TA15ELI alloy with two types of microstructures was studied by instrumented impact test.Charpy specimens with both the 0.2 mm U-notch and the a/W = 0.2 pre-crack were adopted to compare notch sensitivity in the two microstructures.The result shows that the specimen with Widmanst?tten microstructure exhibits a better dynamic fracture toughness and lower notch sensitivity than that with lath-like microstructure.Fracture surfaces in the case of the two microstructures are analyzed to have a ductile and brittle mixed feature under dynamic loading.The fracture surface of lath-like microstructure is composed of dimples and tear ridges,while that of Widmanst?tten microstructure is covered with rough block-like facets and dimples and tear ridges.The α phase boundaries and α/β interfaces act as locations for void nucleation and crack arrest and deviation.The decrease in width of α phase lamellae leads to the increase in the amount of boundaries and interfaces,which causes the increase in the consumption of impact energy and results in the improvement in dynamic fracture toughness. | LIU Rui,HUI Songxiao,YE Wenjun,XIONG Baiqing,YU Yang,and FU Yanyan State Key Laboratory for Fabrication & Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China | 2010 | Rare Metals2010，29，6： | 6 |
| 5 | Tensile and fracture properties of Ti-62A alloy plate with different microstructures显示文摘Ti-62A alloy plates with three different types of microstructure, fully equiaxed, bimodal, and Widmanst tten, were obtained by various heat treatments to investigate the effects of microstructure on the tensile and fracture properties at room temperature. The results reveal that Widmanst tten microstructure exhibits good damage tolerance behavior considering strength, fracture toughness, and fatigue crack growth behavior, while the bimodal microstructure shows good comprehensive properties considering the plasticity synthetically. Optical microscopy (OM) and scanning electron microscopy (SEM) microstructure analyses on fracture and fatigue crack path demonstrate that the dependence of mechanical properties and fatigue crack growth behavior on microstructural feature are attributed to the α lamellae width and the α colony size. | LIU Rui HUI Songxiao YE Wenjun YU Yang FU Yanyan SONG Xiaoyun DENG Xiguang | 2012 | Rare Metals2012，31，5： | 5 |
| 6 | Comparison of the fatigue and fracture of Ti–6Al–2Zr–1Mo–1V with lamellar and bimodal microstructures显示文摘 | Shikai Li Baiqing Xiong Songxiao Hui Wenjun Ye Yang Yu | 2007 | Materials Science & Engineering A2007，，： | 2 |
| 7 | A feature selection method based on improved Fisher's discriminant ratio for text sentiment classification显示文摘 | Wang Suge Li Deyu Song Songxiao | 2011 | Expert Systems With Application2011，38，7： | 1 |
| 8 | Products of Volterra type operator and composition operator from and Bloch spaces to Zyg- mund spaces 显示文摘 | Li Songxiao Stevi?c S | 2008 | Journal of Mathematics Analysis and Application2008，345，： | 1 |
| 9 | Study on mar-contain properties of TB10 alloy 显示文摘 | Liu Wei Zhang Zhu Hui Songxiao | 2005 | Rare Metal Materials and Engineering2005，34，： | 1 |
| 10 | Products of Volterra type operator and composition operator from H∞ and Bloch spaces to Zygmund spaces显示文摘 | Li Songxiao Stevic S | 2008 | Math Anal Appl2008，345，1： | 1 |
| 11 | Generalized composition oper- ators on Zygmund spaces and Bloch-type spaces 显示文摘 | Li Songxiao Stevic S | 2008 | J Math Anal Appl2008，338，： | 1 |
| 12 | Weighted Composition Operators from Zygmund Spaces into Bloch Spaces显示文摘 | Li Songxiao Stevo Stevic | 2008 | Applied Mathematics and Computation2008，206，： | 1 |
| 13 | Products of composition and integral type operators from H∞ to the Bloch space 显示文摘 | Li Songxiao Stevid S | 2008 | Com- plex Variables Elliptic Funct2008，53，3： | 1 |
| 14 | Volterra type operators on Zygmund space 显示文摘 | LI Songxiao STEVIC S | 2007 | J Inequal Appl2007，，1： | 1 |
| 15 | On an integral-type operator from iterated logarithmic Bloch spaces into Bloch-type spaces 显示文摘 | LI Songxiao STEVIC S | 2009 | Ap- plied Mathematics and Computation2009，215，： | 1 |
| 16 | Weighted composition operators from Bergman-type spaces into Bloch spaces 显示文摘 | LI Songxiao STEVIC S | 2007 | Proc Indian Acad Sci Math Sci2007，117，3： | 1 |
| 17 | Weighted composition operators from H' to the Bloch space on the polydisk 显示文摘 | LI Songxiao STEVIC S | 2007 | Abstr Appl Anal2007，2007，： | 1 |
| 18 | Weighted composition operators from Zygmund spaces into Bloch spaces 显示文摘 | LI Songxiao STEVIC S | 2008 | Applied Mathematics and Computation2008，36，2： | 1 |
| 19 | Products of Volterra type operator and composition operator from H∞ and Bloch spaces to Zygmund spaces 显示文摘 | LI Songxiao STEVIC S | 2008 | Journal of Mathematics Analysis and Application2008，345，1： | 1 |
| 20 | Products of composition and integral type operators from H∞ to the Bloch space显示文摘 | Songxiao Li Stevo Stevic | 2008 | Complex Variables and Elliptic Equations2008，，5： | 1 |
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