基于BP算法的Ti-Fe-Mo-Mn-Nb-Zr系钛合金成分优化

研究了不同成分的Ti Fe Mo Mn Nb Zr合金的压缩强度、硬度及其在Hank’s人工体液中的耐腐蚀性能 ,得到了高压缩强度、硬度与牙本质相近的钛合金。在综合考虑钛合金成本、力学性能及耐腐蚀性能的基础上 ,采用BP神经网络建立了钛合金中的元素质量分数与硬度之间的关系 ,并通过实验进行了验证 ,预测结果与实验测定结果的对比是令人满意的。在保证性能的基础上 ,利用训练好的BP网络结构对材料的成分进行优化 ,以减少贵重元素的加入量。     

基于模糊推理的Ti-Fe-Mo-Mn-Nb-Zr系钛合金性能预测及成分优化

考察了不同成分的Ti-Fe-Mo-Mn-Nb-Zr合金的压缩强度、硬度，得到了高压缩强度，硬度与牙本质相近的钛合金。在综合考虑钛合金成本、力学性能的基础上，采用模糊推理系统建立了钛合金中的元素质量百分含量与硬度之间的关系，并通过实验法进行了验证，预测结果与实际测定结果的对比是令人满意的。在保证性能的基础上，利用训练好的模糊推理系统对材料的成分进行优化，减少贵重元素的加入量。     

Ti3Zr2Sn3Mo25Nb医用钛合金相变与力学性能

研究Ti3Zr2Sn3Mo25Nb医用钛合金中相变演化过程和亚稳相对合金强度和弹性模量的影响规律.结果表明:Ti3Zr2Sn3Mo25Nb合金中相的演化过程为β→ω→α″→α,其中亚稳ω相及α″相的尺寸、数量及分布对合金强度、弹性模量及塑性的影响显著.ω相的尺寸越小,数量越多,分布越均匀,这有利于提高合金强度,降低塑性和弹性模量;通过控制亚稳ω相及α″相的尺寸、数量和分布,可以在一定范围里调整Ti3Zr2Sn3Mo25Nb合金的力学性能变化,从而得到更好的生物力学性能匹配.     

低弹性模量Ti-27Nb-8Zr医用钛合金组织与力学性能

利用光学显微镜、扫描电镜和X射线衍射仪研究Ti-27Nb-8Zr(质量分数, %)医用钛合金固溶后在不同时效温度下组织的变化规律,重点讨论不同显微组织对合金弹性模量和强度的影响。结果表明,固溶处理后,合金组织由β+α”两相构成,具有相对低的弹性模量和强度;时效后,组织中包含β、α、ω三相,弹性模量和强度显著升高,随着时效温度的升高,组织长大,弹性模量和强度降低     

钛合金烧伤机理及检测方法研究

研究了飞机用BT20和OT4钛合金材料烧伤后力学性能和电导率随烧伤温度及烧伤时间的变化关系。分析了使用电导率法和硬度法检测钛合金烧伤程度的特点。试验结果表明，钛合金的电导率、硬度和强度均与烧伤温度和烧伤时间呈一定关系，因此可通过测定电导率和硬度的方法确定钛合金的烧伤程度。     

高强度、高韧性、高模量钛合金研究进展

介绍了北京有色金属研究总院在高强度、高韧性、高模量钛合金方面的研究进展.总结了TB8,HE130和Ti-6-22-22S 等三种合金的研制过程和取得的结果.     

钛及钛合金在牙科领域中的研究现状

综述了牙科用钛及钛合金开发、物理力学性能、钛合金烤瓷、成形技术、设备及表面处理等方面的研究现状，指出了目前该类材料存在的问题及努力的方向。     

生体医学用钛合金

最近生体用钛合金〔1〕　近年来作为生体用钛合金的研究和开发 ,几乎都是致力于由无毒性、无过敏性问题的元素所构成的合金 ,根据有关各种金属元素单体的细胞毒性和过敏性的实验数据 ,以铌、钽、锆最为安全 ,而钼和锡等元素也是比较安全的金属。最近 ,对于具有超弹性和形状记忆特性的生体用钛合金的开发十分活跃 ,因而一时又出现了阿尔察默 (Alzheimer)病的问题 ,为解除这一疑虑可在合金中添加适量Al是有效的。根据广泛的有关金属元素毒性和过敏性等问题的实验研究结果 ,近年来开发了一系列安全性相当良好的生体用钛系合金 ,主要有Ti Zr系…     

现代汽车上的钛合金

钛及钛合金具有一系列优点,如：高温强度好、密度小、低温韧性优异、耐热性好,无磁性、热导率低、耐腐蚀,弹性模量约是钢的一半,热膨胀系数低（约是不锈钢及铝材的50％）以及对环境无污染,资源丰富等。因此,不但宇航工业及化学工业已大量用钛,而且作为汽车用材很早就引起人的注意。钛可有效减轻车重,降低燃料消耗,提高工作效率,改善环境和降低噪音等。近年来已成为航空、宇航、化工及造船等部门广泛应用的结构材料。纯钛具有两种同素异构结构,可通过热处理方式提高其强度,塑性也极好,适宜于进行压力加工。     

基于d-电子合金设计理论和JMatPro软件新型生物医用钛合金的设计

基于d-电子合金设计理论和JMatPro软件,运用正交试验,设计了具有较低弹性模量和较高强度且含有无毒元素Nb、Mo、Zr和Sn的新型生物医用∥钛合金Ti-35Nb-4Sn-6Mo-9Zr,并对该合金的显微组织和力学性能进行分析。结果表明,Ti-35Nb-4Sn-6Mo-9Zr合金在800。C下固溶处理后,由单一的β等轴晶构成。与Ti-6Al-4V相比,该合金具有较优越的力学性能：E=65GPa,σb=834MPa,σ0.2=802MPa,6=11％,有望成为新型种植材料。该方法可以有效地降低实验次数,并得到理想的实验结果。     

Porous titanium implants fabricated by metal injection molding

Sodium chloride (NaCl) was added as a space holder in synthesis of porous titanium by using metal injection molding(MIM) method. The microstructure and mechanical properties of porous titanium were analyzed by mercury porosimeter, scanning electron microscope(SEM) and compression tester. The results show that the content of NaCl influences the porosity of porous titanium significantly. Porous titanium powders with porosity in the range of 42.4%–71.6% and pore size up to 300 μm were fabricated. The mechanical test shows that with increasing NaCl content, the compressive strength decreases from 316.6 to 17.5 MPa and the elastic modulus decreases from 3.03 to 0.28 GPa.     

Fabrication of TiO2 nanotube arrays on biologic titanium alloy and properties

The vertically aligned highly ordered TiO2 nanotube arrays were fabricated by potentiostatic anodization of biologic Ti alloys（TLM） and pure Ti substrates, followed by annealing at 480 and 550 ℃ for 6 h. High-resolution scanning electron microscopy （SEM） was applied to characterize the original films. The phase of the film was characterized by XRD. The interfacial adhesion and bond strength between thin films coating and substrate were tested by scratch method. The results show that the films on the TLM alloy have high adhesion strength compared with them on pure Ti.     

Predictions of titanium alloy properties using thermodynamic modeling tools

Thermodynamic modeling tools have become essential in understanding the effect of alloy chemistry on the final microstructure of a material. Implementation of such tools to improve titanium processing via parameter optimization has resulted in significant cost savings through the elimination of shop/laboratory trials and tests. In this study, a thermodynamic modeling tool developed at CompuTherm, LLC, is being used to predict β transus, phase proportions, phase chemistries, partitioning coefficients, and phase boundaries of multicomponent titanium alloys. This modeling tool includesPandat, software for multicomponent phase equilibrium calculations, andPanTitanium, a thermodynamic database for titanium alloys. Model predictions are compared with experimental results for one α-β alloy (Ti-64) and two near-β alloys (Ti-17 and Ti-10-2-3). The alloying elements, especially the interstitial elements O, N, H, and C, have been shown to have a significant effect on the β transus temperature, and are discussed in more detail herein. This paper was presented at the Beta Titanium Alloys of the 00’s Symposium sponsored by the Titanium Committee of TMS, held durig the 2005 TMS Annual Meeting & Exhibition, February 13–16, 2005 in San Francisco, CA.     

3 GPa压力热处理对TC6钛合金的硬度和抗压强度的影响

对TC6钛合金进行3 GPa压力下的高温热处理。通过金相显微镜、扫描电镜及透射电镜对高温高压处理后TC6钛合金的组织进行分析,测试了其硬度和抗压强度。结果表明,3 GPa压力热处理能细化TC6钛合金组织,增大组织致密性和内部位错密度,有效地提高了合金的硬度,却降低了抗压强度。经3 GPa压力热处理+500 ℃保温2 h的热处理后,TC6钛合金可获得较高的硬度和抗压强度,分别为361 HV0.2和1975 MPa。     

6种弓丝的摩擦力与其表面粗糙度、弹性模量及硬度的关系

以医用βTi丝、NiTi丝和不锈钢丝为对象,研究了其表面粗糙度、硬度和弹性模量与摩擦性能之间的相互关系。结果表明:表面粗糙度对摩擦力的影响最显著,并与摩擦力成正相关关系。弹性模量和硬度与摩擦力成负相关关系。通过利用函数回归拟合,建立了表面粗糙度、弹性模量和硬度与摩擦力的定量关系:f=(E-0.02649)·(H-0.07035)·(Ra0.80625),R2=0.9982。     

医用钛合金及其表面活化的研究现状

医用Ti合金具有良好的力学性能、耐腐蚀性能和生物相容性,在医学临床上获得广泛应用,但是其耐磨性能和生物活性等方面仍不够理想,耐腐蚀性能也有待于进一步提高.开发具有更佳综合性能的医用钛合金,或对现有成熟医用钛合金进行表面改性是解决上述问题的有效途径.本文综述了医用钛合金的发展及其存在的问题和表面活化研究进展,并对医用Ti合金的表面活化的前景进行了展望.     

Effects of microstructures on mechanical properties of Ti-63 titanium alloy

The microstructure and mechanical properties of Ti-63 pancakes were investigated under different heat-treatment modes. Pancake No. 1, with an as-forged bimodal structure, was β annealed at 930°C for 1 h. Its structure was changed to a Widmanstatten structure with continuous grain boundary α phase and long lamellar α phase. The pancake showed a good combination of strength, ductility and fracture toughness. Pancake No. 2, with an as-forged bimodal structure, was aged at 540°C for 8 h after annealing at 930°C for 1 h. Other than the fine secondary α precipitates, it showed a similar microstructure to that of pancake No. 1. The fine precipitates can enhance the pancake’s strength while reducing the ductility and fracture toughness. Pancake No. 3, with an as-forged basket-weave structure, was annealed at 750°C for 1 h. Its structure was nearly unchanged and it achieved a better ductility but a slightly lower fracture toughness than pancake No. 1.     

Fatigue crack growth behaviors of a new burn-resistant highly-stabilized beta titanium alloy

This article presents the fatigue crack growth (FCG) behaviors of a new burn-resistant highly-stabilized beta Ti40 alloy. The FCG rates were analyzed. The fracture surfaces and the side surfaces of the test samples were explored. The results show that frequency affects the cracking behaviors of Ti40 alloy. Temperature also plays an important role in Ti40 alloy cracking. At room temperature (25°C), when the frequency increases, the cracking rate changes a little in the range of low stress intensity factor (ΔK), while it changes significantly when ΔK is high. At 500°C, the cracking rate of Ti40 alloy changes significantly during all the course of cracking. The frequency also affects the microstructure patterns of Ti40 alloy. A number of secondary cracks appear in the area more than 200 μm from the main crack at a high ΔK when the frequency is 1 Hz, but only a few secondary cracks exist when the frequency is 10 Hz. Facet image is the main image of the fracture surfaces when the frequency is 1 Hz. While, ductile striation occupies most of the area of fracture surfaces when the frequency is 10 Hz.     

Ti-Mo-Zr-Fe合金的微观结构与纳米压入特性的关系

通过不同的热处理制度控制TMZF合金中的相组成和含量，利用XRD分析确定各种相结构。利用纳米压入测量仪测试了不同组织结构下的硬度和弹性模量。结果表明，当合金中存在ω相时，合金的的硬度和弹性模量最高，随着热处理温度的提高，合金中的ω相消失，代之而来的是α相，而且越接近β转变温度，α相含量越少，对应的弹性模量和硬度越来越低。对于Ti—Mo—Zr-Fe合金来说压入性能（硬度、弹性模量）与相成分之间存在着良好的匹配关系。