Characterization of superplasticity in Ti-5.5Al-1Fe alloys
Characterization of superplasticity in Ti-5.5Al-1Fe alloys
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DOI：
10.1016/s1359-6462(98)00286-3
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发表时间：
1998-09
影响因子：
6
通讯作者：
J. Koike;Y. Shimoyama;H. Fujii;K. Maruyama
中科院分区：
文献类型：
--
作者：
J. Koike;Y. Shimoyama;H. Fujii;K. Maruyama
钛合金由于其重量轻、强度高、耐腐蚀性好而得到广泛应用。在众多钛合金中，Ti-6Al-4V因其良好的强度-延展性平衡和优异的超塑性能力而成为最受欢迎的钛合金之一。其应用范围从航空航天材料到生物材料。然而，钒是一种昂贵的合金元素，并且对于生物应用具有细胞毒性（1）。因此，近年来一直在寻求用其他稳定元素代替钒（2 - 5）。据报道，添加快速扩散元素作为稳定剂可提高室温强度并改善超塑性能力（6，7）。Wert和Paton（8）编制了合金元素扩散率与相变抑制温度之间的关系。结果表明，在Ti相中，Fe、Co和Ni的扩散速度比Ti和V快近两个数量级。在这三种元素中，Co和Ni具有细胞毒性，而Fe没有。在这种情况下，Ti-Al-Fe系统是作为Ti-6Al-4V的替代物用于生物应用的有希望的候选者。Zwicker等人报道了铸造和研磨性能。（3，4）。Breme和Heimke（5）进行了腐蚀疲劳试验。最近，Niinomi et al. (9)研究了显微组织对Ti-5Al-2.5Fe合金断裂韧性、疲劳强度和其它力学性能的影响，并与Ti-6Al-4V和SUS316L进行了对比。为了优化合金浓度以获得更好的机械性能，Fujii et al. (10，11）研究了在室温下对于各种浓度的Al（2 - 5.5质量%）和Fe（1 - 2质量%）的拉伸和疲劳强度。他们发现，Ti-5.5 Al-1Fe合金具有比Ti-6Al-4V更高的强度、延展性和疲劳强度，以及稍好的热加工性。尽管超塑性是Ti-6Al-4V在材料成形方面最有吸引力的特征之一，但迄今为止，在Ti-5.5 Al-1Fe合金中没有关于超塑性的信息。本文报道了Ti-5.5Al-1Fe合金的超塑性行为，并与Ti-6Al-4V合金的超塑性行为进行了比较。
Ti alloys have been widely used because of their light weight, high strength, and high corrosion resistance. Among many Ti alloys, Ti-6Al-4V is one of the most popular Ti alloys because of a good strength-ductility balance and an excellent superplastic ability. Its application ranges from aerospace materials to biological materials. However, vanadium is an expensive alloying element and is cytotoxic for biological applications (1). Thus, replacement of vanadium by other-stabilizing elements has been sought in recent years (2–5). It has been reported that the addition of a fast diffusing element as a stabilizer increases room temperature strength and improves superplastic ability (6, 7). Wert and Paton (8) compiled the relationship between the diffusivity of alloying elements and-transus depression temperature. They showed that Fe, Co, and Ni diffuse nearly two orders of magnitude faster than Ti and V in the phase of Ti. Among the three elements, Co and Ni are cytotoxic, but Fe is not. In this context, a Ti-Al-Fe system is a promising candidate as a substitute for Ti-6Al-4V for biological applications. Casting and abrasive properties were reported by Zwicker et al.(3, 4). Corrosion fatigue tests were performed by Breme and Heimke (5). More recently, Niinomi et al.(9) studied the effects of the microstructure on fracture toughness, fatigue strength, and other mechanical properties of Ti-5Al-2.5 Fe alloys in comparison with Ti-6Al-4V and SUS316L. In order to optimize the alloy concentration for better mechanical properties, Fujii et al.(10, 11) studied tensile and fatigue strength at room temperature for various concentrations of Al (2 5.5 mass%) and Fe (1 2 mass%). They found that Ti-5.5 Al-1Fe alloy exhibited higher strength, ductility and fatigue strength and a little better hot workability than Ti-6Al-4V. Although superplasticity is one of the most attractive features of Ti-6Al-4V in terms of materials forming, no information regarding superplasticity is available to date in the Ti-5.5 Al-1Fe alloy. In this paper, we report superplastic behavior in the Ti-5.5 Al-1Fe alloy and compare the obtained results with those of Ti-6Al-4V.