Interfacial Science of Nano-lamellar Materials

纳米层状材料的界面科学

• 批准号: 19206066
• 负责人: MARUYAMA Kouichi
• 金额: $ 30.95万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19206066/
• 关键词: チタンアルミナイド; 界面構造; ミスフィット転位; 降伏応力; クリープ強度; 金属間化合物; ナノ層状組織; 界面構造設計; 材料強化; ホールペッチの関係; 相変態

The present research studied mechanical properties of nano-lamellar materials consisting of α_2Ti_3Al phase and γTiAl phase. This type of materials contains a large number of α_2/γ interfaces, which act as obstacles to dislocation motion and improve strength of such materials. Elastic limit of nano-lamellar materials is insensitive to lamellar thickness λ, but the interfaces without misfit dislocation provide a higher elastic limit. Work-hardening rate of nano-lamellar materials is inversely proportional to λ, and the coefficient is increased by the introduction of misfit dislocations. Disappearance of α_2/γ interfaces during high temperature exposure causes degradation of nano-lamellar materials. Bands of β_0 precipitates are formed after dissolution of α_2 lamellae when a β_0 phase forming element is added. The precipitation bands give high creep strength after the disappearance of α_2 lamellar.

研究了由α_2Ti_3Al相和γ-TiAl相组成的纳米片层材料的力学性能。这种材料中含有大量的α_2/γ界面，阻碍了位错的运动，提高了材料的强度。纳米片层材料的弹性极限对片层厚度λ不敏感，但无失配位错的界面提供了较高的弹性极限。纳米片层材料的加工硬化率与λ成反比，失配位错的引入增加了加工硬化率。高温下α_2/γ界面的消失会导致纳米片层材料的退化。加入β_0相形成元素后，α_2片层溶解，形成β_0析出物条带。α_2片层消失后，析出带具有较高的蠕变强度。

项目成果

Strengthening Behaviour of Beta Phase in Lamellar Microstructure of TiAl alloys : An Overview

TiAl 合金层状显微组织中 Beta 相的强化行为：概述

• 发表时间: 2010
• 期刊: JOM 62巻, 1号
• 作者: Hanliang Zhu;D. Y. Seo;K. Maruyama
• 通讯作者: K. Maruyama

Control of Misfit Dislocations on Gamma/Alpha2 Boundaries by Alloy Addition to Lamellar TiAl Alloy

通过在层状 TiAl 合金中添加合金来控制 Gamma/Alpha2 边界上的失配位错

• 发表时间: 2007
• 期刊: Proceedings of Ti2007 (印刷中)
• 作者: 鳥山康成;Yasunari Toriyama
• 通讯作者: Yasunari Toriyama

Influence of Step Aging on Creep Behavior and Microstructural Evolution of Fine-grained Fully Lamellar XD TiAl Alloys

分步时效对细晶全层状 XD TiAl 合金蠕变行为和微观结构演变的影响

• 发表时间: 2007
• 期刊: Materials Science Forum 539-543巻
• 作者: Hanliang Zhu;D. Y. Seo;K. Maruyama;P. Au
• 通讯作者: P. Au

Effect of Microstructure on Creep Deformation of 45XD TiAI Alloy at Low and High Stresses

低应力和高应力下显微组织对 45XD TiAl 合金蠕变变形的影响

• 发表时间: 2008
• 期刊: Material Science and Engineering, A 483-484
• 作者: Hanliang;Zhu
• 通讯作者: Zhu

Importance of Microstructural Stability in Creep Resistance of Lamellar TiAl Alloys

微观结构稳定性对层状 TiAl 合金抗蠕变性能的重要性

• 发表时间: 2008
• 期刊: Materials Science Engineering A 483-484巻
• 作者: Masahiro Yamaguchi;Hanliang Zhu;Mayumi Suzuki;Kouichi Maruyama;Fritz Appel
• 通讯作者: Fritz Appel