Perfect superelasticity by dispersion of effective precipitate routed through brittle phase in biomedical titanium alloy

生物医用钛合金中通过脆性相的有效析出物的弥散实现了完美的超弹性

• 批准号: 20360310
• 负责人: HOSODA Hideki
• 金额: $ 12.48万
• 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: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20360310/
• 关键词: インテリジェント材料; 安全・安心材料; 組織制御

There is no effective method of microstructural control to suppress the slip deformation that competes with superelastic deformation inβ-Titanium superelastic alloy, though this alloy is a candidate biomedical superelastic alloy. The superelastic deformation in β-titanium alloy is, therefore, not a perfect one ; plastic strain remains after deformation. We propose a new heat-treatment method to precipitate fine α-phase for strengthening that is nucleated at fine ω-phase. The ω-phase brings extreme brittleness and is not used in usual heat-treatment of titanium alloy, whereas it is used as a medium for ω-phase nucleation in our new method. 800MPa in strength and perfect shape recovery are achieved by a three-step heat-treatment : 773K (fine ω precipitation)→1023K (fine α precipitation at ω)→1123K(erasing ω) in Ti-Mo-X (X=Al and Mn). In addition, a low-temperature heat-treatment around 373K as the fourth step improved mechanical property.

虽然β-钛超弹性合金是一种候选的生物医学超弹性合金，但目前还没有有效的微观结构控制方法来抑制与超弹性变形相竞争的滑移变形，因此β-钛合金中的超弹性变形并不是完美的。 ; 我们提出了一种新的热处理方法，用于析出细小的 α 相，以在细小的 ω 相处形核。 ω相具有极高的脆性，在钛合金的常规热处理中不使用，而我们的新方法中将其用作ω相成核的介质，通过三步实现了800MPa的强度和完美的形状恢复。热处理：Ti-Mo-X中773K（细化ω析出）→1023K（细化α在ω处析出）→1123K（消除ω） (X＝Al和Mn)此外，作为第四步骤的373K左右的低温热处理改善了机械性能。

项目成果

anomalous temperature dependence of the superelastic behavior of Ti-Nb-Mo alloys

Ti-Nb-Mo 合金超弹性行为的反常温度依赖性

• 发表时间: 2011
• 影响因子: 9.4
• 作者: Y.AI

Effect of nitrogen Addition on Mechanical Property of Ti-Cr-Sn Alloy

氮添加对Ti-Cr-Sn合金力学性能的影响

• 发表时间: 2010
• 作者: Yuichi.Nakahira; Tomonari.Inamura; Hiroyasu.Kanetaka; Shuichi.Miyazaki; Hideki.Hosoda
• 通讯作者: Hideki.Hosoda

Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical Shape Memory Alloy

时效对Ti-Mo-Al生物医用形状记忆合金力学性能的影响

• 发表时间: 2010
• 作者: Hideki.Hosoda; Makoto.Taniguchi; Tomonari.Inamura; Hiroyasu.Kanetaka; Shuichi.Miyazaki
• 通讯作者: Shuichi.Miyazaki

Interfacial defects in Ti-Nb shape memory alloys

Ti-Nb形状记忆合金的界面缺陷

• 发表时间: 2008
• 作者: C.Y.Chai; Y.W.Kim; H.Hosoda; S.Miyazaki
• 通讯作者: S.Miyazaki

Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical Shape Memory Alloy

时效对Ti-Mo-Al生物医用形状记忆合金力学性能的影响

• 发表时间: 2010
• 作者: Hideki.Hosoda; Makoto.Taniguchi; Tomonari.Inamura; Hiroyasu.Kanetaka; Shuichi.Miyazaki
• 通讯作者: Shuichi.Miyazaki