Control of microstructure and mechanical anisotropy of biomedical superelastic titanium alloys through introducing high density lattice defects.

通过引入高密度晶格缺陷控制生物医用超弹性钛合金的微观结构和机械各向异性。

基本信息

批准号：
17360334
负责人：
HOSODA Hideki
金额：
$ 10.45万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

The purpose of this research is to clarify the relationships among microstructures, defects and mechanical properties of Ni-free biomedical shape memory alloys, especially TiNbAl alloys, through thermo-mechanical treatments to introduce high-energy and high-density lattice defects by severe deformations. In order to enhance their superelastic properties, material strengthening to increase critical stress for slip deformation is effective and this was tried by severe deformations of cold rolling up to 99% in reduction thickness and rapid solidification. Firstly, the formation of texture and superelastic deformation were investigated using Ti-26Nb-3A1 alloy with relatively low martensitic transformation temperatures. It was found that the development of deformation texture is strongly related to true strain and that the texture is rapidly grown after when the true strain becomes over 3. Although the grain size after the solution treatment is coarse around 500μm, the grains become fine an … More d needle-like shape elongated with the rolling direction. Then, the development of recrystallization texture was investigated with various cold rolling reductions. It was found that the development of recrystallization texture is strongly dependent on reduction rate, and that different textures are developed. {001}_β<110>_β type texture is formed when cold rolling reduction is lower than 90%, and further increasing cold rolling reduction, the texture formed is changed to {112}_β<110>_β type. {001}_β<110>_β type exhibits less anisotropy in superelasticity than {112}_β<110>_β, resulting that {001}_β<110>_β type texture is more useful for practical applications. Secondly, the texture formation of α" and α"+β type TiNbA1 alloys was investigated. It was found that deformation and recrystallization textures are {112}_β<110>_β type and {111}_β<110>_β for the α"+β alloy, respectively. Besides, deformation and recrystallization textures of α" alloy are {223}_<α"><302>_<α"> type and {011}_<α"><311>_<α"> for the α" alloy, respectively. Therefore, the type of texture formation as well as superelasticity strongly depends on the type of stable phase in the TiNbAl alloys. Similar results were obtained for the cold rolled wires. Finally, the rapid solidification was done for Ti-24Nb-3A1 but neither texture nor fine grains were formed even though the high energy process of the rapid solidification. It is conclude that texture and superelastic properties of the titanium alloys can be controlled through a proper thermomechanical treatment combined with severe deformation. Less

本研究的目的是阐明无镍生物医用形状记忆合金，特别是TiNbAl合金的微观结构、缺陷和机械性能之间的关系，通过热机械处理通过剧烈变形引入高能和高密度晶格缺陷。为了增强其超弹性性能，材料强化以增加滑移变形的临界应力是有效的，并且通过冷轧压下率高达99％的剧烈变形和快速凝固进行了尝试。首先，利用马氏体转变温度较低的Ti-26Nb-3A1合金研究了织构的形成和超弹性变形，发现变形织构的发展与真实应变有关，并且在真实应变后织构迅速生长。应变变得超过3。虽然固溶处理后的晶粒尺寸粗大到500μm左右，但晶粒变得细小，并且随着轧制方向伸长的针状形状。对不同冷轧压下量下的再结晶织构进行了研究，发现再结晶织构的发展很大程度上取决于压下率，并且当冷轧压下量时会形成不同的{001}_β<110>_β型织构。低于90%，进一步提高冷轧压下量，形成的织构转变为{112}_β<110>_β型。与{112}_β<110>_β相比，其超弹性各向异性较小，因此{001}_β<110>_β型织构在实际应用中更有用。其次，α”和α”+β型TiNbAl合金的织构形成。研究发现变形和再结晶织构为{112}_β<110>_β型。 α"+β合金分别为{111}_β<110>_β。此外，α"合金的变形和再结晶织构为{223}_<α"><302>_<α">型和{011} _<α"><311>_<α"> 分别表示 α" 合金。因此，织构形成的类型以及超弹性很大程度上取决于合金中稳定相的类型。 TiNbAl 合金也得到了类似的结果，最后，对Ti-24Nb-3A1 进行了快速凝固，但即使获得了高能的快速凝固过程，也没有形成织构或细晶粒。钛合金的超弹性性能可以通过适当的热机械处理和较小的变形来控制。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Effect of Cu Addition on Shape Memory Behavior of Ti-18mol% Nb Alloys

效果%20of%20Cu%20添加%20on%20形状%20记忆%20行为%20of%20Ti-18mol%%20Nb%20合金

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
Y. Horiuchi; K. Nakayama; T. Inamura; H.Y. Kim; K. Wakashima; S. Miyazaki; H. Hosoda
通讯作者：
H. Hosoda

TiNbAl合金の集合組織形成

TiNbAl合金织构形成

DOI：
发表时间：
2005
期刊：
影响因子：
0
作者：
細田秀樹; 稲邑朋也; 若島健司; 木下弥生; 宮崎修一
通讯作者：
宮崎修一

Microstructure and Shape Memory Property of Ti-24Nb-3AlMelt-Spun Ribbon

Ti-24Nb-3Al熔纺带材的显微组织和形状记忆性能

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
Y. Yamamoto; Y. Tsugane; T. Inamura; H. Hosoda; K. Wakashima; S. Miyazaki; S. Tsurekawa; T. Matsuzaki; T. Nakano; Y. Umakoshi
通讯作者：
Y. Umakoshi

Internal Twin and Defect of α"-Martensite in Ti-NB-AI Shape Memory Alloy

Ti-NB-AI形状记忆合金中α"-马氏体的内部孪晶及缺陷