Ti－15－3合金管材的试制及组织性能研究

本文介绍了Ｔｉ－１５－３合金管材的加工工艺及工艺性能，研究了热处理条件对其性能的影响，并分析观察了不同状态下的组织特征。实验中还利用Ｘ射线衍射方法对Ｔｉ－１５－３合金管材的织构类型进行了确定。     

Ti－15－3合金的性能数据

研究了可冷成形的Ｔｉ－１５－３高强钛合金两种时效制度的全面力学性能，为该合金的扩大应用提供了依据。     

Ti—15—3钛合金的应用研究

研究了冷加工对Ｔｉ－１５－３合金时效性能的影响，并研究了该合金的冷成形性能及零件制造工艺。为Ｔｉ－１５－３高强钛合金钣金零件的应用提供了经验。     

Ti－15－3合金管材的试制及组织性能研究EI

本文介绍了Ｔｉ－１５－３合金管材的加工工艺及工艺性能，研究了热处理条件对其性能的影响，并分析观察了不同状态下的组织特征。实验中还利用Ｘ射线衍射方法对Ｔｉ－１５－３合金管材的织构类型进行了确定。     

Ti－15－3钛合金的成分控制及性能研究

研究了铝和氧对Ｔｉ－１５－３钛合金的力学性能和冷成形性能的影响，提出了该合金的成分控制范围，为该合金的工业化稳定生产提供了依据。针对我国的国情，提出了与３０ＣｒＭｎＳｉＡ结构钢等强度的时效制度，并研究了相应的力学性能。     

Ti－Si－Nd纳米复合材料的微观结构

加入６ｍｇ·ｇ（－１）Ｎｄ的非晶Ｔｉ＿（８０）Ｓｉ＿（２０）合金，在５５０—７００退火１ｈ后，可形成Ｔｉ＿３Ｓｉ基体相与弥散分布的α—Ｔｉ颗粒组成的纳米复合材料．Ｘ射线及电子衍射分析表明：在晶化过程中，初始析出相为小颗粒的α－Ｔｉ，随后析出主相Ｔｉ＿３Ｓｉ和少量Ｔｉ＿５Ｓｉ＿３，但未见稀土相形成．用高分辨电镜研究了Ｔｉ＿３Ｓｉ的亚晶结构．     

连续碳化硅纤维增强Ti－15－3合金基复合材料界面的初步研究

本文对连续ＳｉＣ纤维增强Ｔｉ－１５－３合金基复合材料的界面进行了初步的研究。试验结果表明，真空热压或热等静压复合固结ＳｉＣ／Ｔｉ－１５－３试样中界面反应区尺寸约为４μｍ左右，界面部位含有较多的Ｔｉ、Ｓｉ和较少的Ｖ、Ｃｒ、Ｓｎ、Ａｌ。     

Ti－15－3钛合金的成分控制及性能研究EI

研究了铝和氧对Ｔｉ－１５－３钛合金的力学性能和冷成形性能的影响，提出了该合金的成分控制范围，为该合金的工业化稳定生产提供了依据。针对我国的国情，提出了与３０ＣｒＭｎＳｉＡ结构钢等强度的时效制度，并研究了相应的力学性能。     

一种新型的抗氧化超高强度钛合金

本文介绍了一种新型的抗氧化超高强度钛合金－Ｂｅｔａ－２１Ｓ，及其发展，加工，并着重介绍了该合金的物理，力学性能及其应用。该合金室温强度高，高温性能好，５９０℃以下具有极好的热稳定性，８１５℃时氧化率只是Ｔｉ－１５－３合金的１％，抗腐蚀性能优良，抗里面性能优于ＴＣ４和Ｔｉ－１５－３合金，冷加工性能与被称为“合金化的工业纯钛”的Ｔｉ－１５－３合金相当，填补了钛合金应用的某些空白。     

SrO－Y_2O_3－TiO_2体系的相关系与电性质

测定了ＳｒＯ－Ｙ＿２Ｏ＿３－ＴｉＯ＿２体系（１２００℃）的相关系及其电性质，发现：本体系内有７个三相区，１５个二相区，７个单相区。本体系内无三元新相存在。且Ｓｒ＿２ＴｉＯ＿４和ＳｒＴｉＯ＿３存在有限二元固溶体。ＳｒＴｉＯ＿３、Ｓｒ＿３Ｔｉ＿２Ｏ＿７和Ｓｒ＿２ＴｉＯ＿４的介电常数ε＇颇大（＞１００）。添加某些元素以改性，可望获得较好的功能材料。     

Prediction and Simulation of Microstructure of Ti-15-3 Alloy

Ti-15-3 alloy is a new metastableβ-type titanium. The influence of hot deformation parameters on the microstructureof Ti-15-3 alloy after solution treatment has been studied by isothermal compression tests as well as quantitativemetallographic analysis.     

Component Evaporation of Ti-15-3 Melt during ISM Processing

How to control melt composition is the key for getting high quality alloy melt. The paper made the following efforts: (1) The activity coefficients in Ti-15-3 melt have been calculated. (2) Taking advantage of the activity coefficients, the evaporation losses of components in Ti-15-3 melt during ISM process have been studied. The calculated results show that there is a critical vacuum degree (about 1.33 Pa) during melting process.     

β21S超高强钛合金性能试验研究

β21S(名义成分Ti-15Mo-3Al-2.7Nb-0.2Si)钛合金是Timet公司针对美国航空航天飞机计划NASP对抗氧化金属及复合材料基体的需求而研制的一种亚稳定β型钛合金,该合金具有优异的冷热加工性能、深的淬透性、抗蠕变性能、高的抗氧化性能和良好的抗腐蚀性能,可用于制作有温度要求的飞机结构件或发动机部件紧固件和液压管材、钣金件等,已经用于制造波音777飞机发动机舱导风罩等部件。β21S合金作为一种典型的亚稳定的β型钛合金,通过适当的工艺热处理后,可获得1 300 MPa以上超高抗拉强度及不小于6%的延伸率,为了全面了解并掌握高强热处理工艺处理后的β21S钛合金性能,我们对β21S钛合金进行了全面性能试验研究。     

Key Problems of Cold Power Spinning of Ti-15-3 Alloy

［1］Stan R Seagle: Mater. Sci. Eng., 1996, 1, A213. ［2］R.R.Boyer: Mater. Sci. Eng., 1996, 103, A213. ［3］B.M.Rabech: JOM, 1994, 14, 6. ［4］R.P. Singhal: J. Mater. Process. Technol., 1990, 29,23.     

Comparison of microstructural evolution in Ti-Mo-Zr-Fe and Ti-15Mo biocompatible alloys

The microstructural evolution and attendant strengthening mechanisms in two biocompatible alloy systems, the binary Ti-15Mo and the quaternary Ti-13Mo-7Zr-3Fe (TMZF), have been compared and contrasted in this paper. In the homogenized condition, while the Ti-15Mo alloy exhibited a single phase microstructure consisting of large β grains, the TMZF alloy exhibited a microstructure consisting primarily of a β matrix with grain boundary α precipitates and a low volume fraction of intra-granular α precipitates. On ageing the homogenized alloys at 600 ^∘C for 4 h, both alloys exhibited the precipitation of refined scale secondary α precipitates homogeneously in the β matrix. However, while the hardness of the TMZF alloy marginally increased, that of the Ti-15Mo alloy decreased substantially as a result of the ageing treatment. In order to understand this difference in the mechanical properties after ageing, TEM studies have been carried out on both alloys in the homogenized and homogenized plus aged conditions. The results indicate that the ω precipitates dissolve on ageing in case of the Ti-15Mo alloy, consequently leading to a substantial decrease in the hardness. In contrast, the ω precipitates do not dissolve on ageing in the TMZF alloy and the precipitation of the fine scale secondary α leads to increased hardness.     

Superconducting properties of Ti-Nb-Hf alloys

To achieve improvements in superconducting properties of the Ti-Nb superconductor, effects of ternary additions of Hf have been extensively studied on 42 Ti-Nb-Hf alloys with compositions of 25 - 65at%Nb, 0- 15at%Hf and the balance Ti. Critical temperatures are found to depend upon Hf addition and aging temperature. In as-rolled Ti-40at%Nb-3at%Hf alloy the critical temperature is raised by about 0.3K over Ti- 40at%Nb alloy. Aging at 800°C can raise critical temperatures of high Hf alloys by 0.6 - 1.8K. The upper critical field at 4.2K of as-rolled Ti-40at%Nb-3at%Hf reaches 11.7 tesla, a value higher by 0.4 tesla than that of Ti-40at%Nb. High field critical current densities are also improved by the 3at%Hf addition. 2 step aging treatment is found effective in enhancing critical current densities of high Hf alloys. No degradation in fabricability is caused by a few at% Hf additions.     

Improved mechanical properties of Ti–15V–3Cr–3Sn–3Al alloy by electron beam welding process plus heat treatments and its microstructure evolution

Electron beam welding (EBW) and related heat treatments were carried out on Ti–15V–3Cr–3Sn–3Al (Ti-15-3) alloy plate materials. It was found that the operated parameters in the present EBW process together with suitable heat treatments significantly enhanced the mechanical properties as well as the elongations of the Ti-15-3 weldment, which may provide a promising way for further industrial application. Furthermore, the observed nano size phase of β, α, and here first reported TiCr₂ particle, may form from the solid solution matrix of the Ti-15-3 alloy. The possible mechanisms for these phase formation are discussed.     

Phenomena of nanotube nucleation and growth on new ternary titanium alloys

Ti-30Nb-xZr and Ti-30Ta-xNb alloys have been investigated using various methods of surface nanotube formation. Ternary Ti-30Nb-xZr (x = 3 and 15 wt%) and Ti-30Ta-xNb (x = 3 and 15 wt%) alloys were prepared by using high-purity sponge Ti (Grade 4, G&S Titanium, USA), Ta, Zr and Nb spheres. The two groups of ternary Ti alloys were prepared using a vacuum arc melting furnace. Nanotube formation was carried out with a conventional three-electrode configuration with the Ti alloy specimen, a platinum counterelectrode, and a saturated calomel (SCE) reference electrode. Experiments were performed in 1 M H3PO4 with small additions of NaF (0.1-0.8 wt%), using a potentiostat. Nanotubes formed on the surfaces of the two ternary Ti alloys were examined by field emission scanning electron microscopy, EDS and XRD. The Ti-30Ta-xZr alloys had microstructure with entirely needle-like constituents; the thickness of the needle-like alpha-phase increased as the Zr content increased. The Ti-30Nb-xZr alloys had equiaxed microstructures of the beta-phase, and increasing amounts of the needle-like alpha phase appeared at the grain boundaries of the beta-phase as the Zr content increased. The nanotubes were nucleated and grew mainly on the beta phase for the Ti-30Ta-3Zr and Ti-30Nb-3Zr alloys, which had nanotubes with uniform shape, but the nanotubes were nucleated at the alpha phase for the Ti-30Ta-15Zr and Ti-30Nb-15Zr alloys, which had nanotubes with irregular shape and diameters of two sizes. The diameter and depth of the nanotubes could be controlled, depending upon the alloy composition and composition of the surface oxide films (TiO2, Nb2O5, Ta2O5, and ZrO2). It is concluded that this research that selection of the appropriate alloying element can allow significant control of the nanotopography of these Ti alloy surfaces and that it is possible to control the surface nanotube size to promote long-term osseointegration for clinical dental or orthopedic use.