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| 1 | Geometrical Scale-Sensitive Fatigue Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloys With α/β Lamellar Microstructures显示文摘Fatigue properties of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy sheets containing different numbers of α/β Widmansttten colonies in the thickness direction of the sheets were investigated by tensionetension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmansttten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated. | B.Zhang Z.M.Song L.M.Lei L.Kang G.P.Zhang | 2014 | Journal of Materials Science & Technology2014，30，12： | 4 |
| 2 | Microstructural Evolution and Service Performance of Cold-drawn Pure Aluminum Conductor Wires显示文摘Microstructures and service performance(mechanical and electrical properties) of the commercially pure Al conductor wires subjected to different cold drawing strains were investigated. The results show that the microstructures of the cold-drawn Al wires along the radial direction were inhomogeneous, i.e. the texture in the center region was strong <111> and weak <001> components, while that in the surface region shifted from the initial cubic texture to a <112> component and finally developed into a strong<111> component. The volume fraction of the high angle grain boundaries in the surface region was higher than that in the center region. The cold-drawing process greatly enhanced the yield strength of the pure Al wires while retained the acceptable electrical resistivity. The strengthening mechanism and the variation of electrical conductivity of the cold-drawn Al wires are discussed through correlating with microstructure evolution. | X.M.Luo Z.M.Song M.L.Li Q.Wang G.P.Zhang | 2017 | Journal of Materials Science & Technology2017，33，9： | 2 |
| 3 | Toward developing Ti alloys with high fatigue crack growth resistance by additive manufacturing显示文摘Fatigue crack growth behaviors were investigated by three-point bending tests for TA19 alloy fabricated by laser metal deposition and four kinds of heat-treated samples.The crack growth resistance of the TA19 samples in the near-threshold regime and Paris regime was evaluated through the experimental characterization and theoretical analysis of the interaction between fatigue crack andα/βphase inter-face,columnar prior-βgrain boundary and colony boundary.The results show that in the near-threshold regime,the fatigue crack propagation threshold and resistance increase with the increase of widths of lamellarαp phases and colonies,and the decrease of the number ofαlaths with an angle(ϕ)relative to the applied stress direction ranging from 75°to 90°.In the Paris regime,the fatigue cracking path can be deflected at colony boundaries or columnar prior-βgrain boundaries.The larger the deflection angle,the more tortuous the cracking path and the lower the fatigue crack growth rate.The angle(γ)of the columnar prior-βgrain growth direction relative to the build direction affects not onlyϕof differentαvariants,but also the fatigue cracking path deflection angle(θij)at columnar prior-βgrain boundaries.An optimal combination ofγ=0°-15°-0°-15°for several adjacent columnar prior-βgrains is derived from the theoretical analysis,and that can effectively avoidϕbeing in the range from 75°to 90°and makeθij as large as possible.Such findings provide a guide for the selection of scanning strategies and process parameters to additively manufacture Ti alloys with high fatigue damage tolerance. | F.Wang L.M.Lei X.Fu L.Shi X.M.Luo Z.M.Song G.P.Zhang | 2023 | Journal of Materials Science & Technology2023，，1： | 1 |
| 4 | On Temperature and Strain Rate Dependent Strain Localization Behavior in Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy显示文摘Deformation behaviors of Ti-6.5AI-3.5Mo- 1.5Zr-0.3Si alloys withα/βlamellar structure were investigated systematically at different temperatures from room temperature to 950℃and different strain rates.Results reveal that when the deformation temperature is higher than a critical temperature of 600℃,an evident transition of deformation behavior from localized shear banding toα/βlamella kinking,flow softening and temperature/strain rate-dependent peak flow stress occurred in the alloy.The critical conditions for the occurrence of internal cracking and strain localization behavior associated with temperature and strain rate were determined. | B.Zhang L.M.Lei X.L.Jiang Z.M.Song X.Huang G.P.Zhang | 2013 | Journal of Materials Science & Technology2013，29，3： | 0 |
| 5 | 用于确定速度和衰减的2.5D全波井间反演法显示文摘在不同的二维问题(例如2.5维结构)情况中,Song和Williamson(1992)曾介绍过一种三维震源波场的精确模拟方法。本文介绍了一种频率域波场反演法,利用此法可将Pratt(1989)的方法扩展用于2.5维。因为动力学方法是正确的,所以计算的波场在没有明显的平界面变化情况下可直接与实际数据对比,并可进行非线性迭代反演。按照Tarantola(1984)的观点,反演可表述为最小二乘方最优化问题,并利用Born线性近似导出给定模型的梯度方向。本方法的潜在效率是很高的,因为每次迭代只有一个频率分量需要估算。在开始时频率应该很低,这样可避免周期跳跃效应,然后在反演时可加大频率,以便提高分辨率。在恒密度声学介质情况下,衰减可看作速度场的虚部,它很容易包括在反演中。此方法无需对频率与衰减的关系做任何假设,其潜在效率已用含断层层状模型上计算的合成数据集作了证明。该速度(即速度实部)几乎可恢复到现有频率所能达到的分辨率极限。虽然衰减恢复的精度较低,但仍然可用。 | Z.M.Song 徐仪征 | 1994 | 石油物探译丛1994，，3： | 0 |
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