Improvement of Toughness in B2-type Intermetallic Compounds

B2型金属间化合物韧性的提高

• 批准号: 01550544
• 负责人: TAKASUGI Takayuki
• 金额: $ 1.6万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550544/
• 关键词: IVa-VIII compound; Intermetallic compound; B2 type; CoTi; High temperature deformation; Superlattice dislocation; Phase stability; CoHf; 耐熱材料

The present study aimed to understand the strength anomaly and to attempt to improve the toughness of B2-type intermetallic compounds. The following results were obtained.1. Whether strength anomaly is operative was observed on CoTi, CoZr, CoHf, NiTi and FeTi intermetallics. Result showed that CoTi, CoZr, Colif and NiT! displayed the strength anomaly while Fe Ti did not displayed. Tis strength anomaly was examined also in the pseudobinary alloys FeTI-CoTi-NiTi.2. Operative slip systems iri CoTi single crystals were determined by means of optical microscopy and transmission electron microscopy and shown to be(011)<001>in wide range of temperatures and orientations. Also, TEM weak observation indicated that<001>dislocation was not dissociated into partials.3. It was proposed that strength anomaly is due to core structure of a<001>dislocation.4. A number of B2-type intermetallic compounds were reviewed in terms of operative slip systems and thereby anisotropy of elastic parameters and APB energy were shown to be important.

本研究旨在了解强度异常，并试图提高韧性的B2型金属间化合物。得到以下结果.对CoTi、CoZr、CoHf、NiTi和FeTi金属间化合物的强度异常是否起作用进行了观察。结果表明，CoTi、CoZr、CoLif和NiT！显示强度异常，而Fe Ti未显示强度异常。在FeTI-CoTi-NiTi伪二元合金中也发现了这种强度异常。用光学显微镜和透射电子显微镜测定了CoTi单晶中的有效滑移系，表明<001>在较宽的温度和取向范围内，滑移系为（011）。透射电镜弱观察表明，<001>位错没有分解成部分位错.提出强度异常是由于位错的核结构<001>所致.一些B2型金属间化合物的操作滑移系统进行了审查，从而弹性参数和APB能量的各向异性被证明是重要的。

项目成果

T.Takasugi: "Plastic Flow of B2-type CoTi Single Crystals" Thil.Mag.A. (1990)

T.Takasugi：“B2 型 CoTi 单晶的塑性流动” Thil.Mag.A.

T. Takasugi, K. Tsurisaki, O. Izumi and S. Ono: "Plastic Flow of B2-type CoTi Single Crystals" Philosophical magazine A. 61. 785-880 (1990)

T. Takasugi、K. Tsurisaki、O. Izumi 和 S. Ono：“B2 型 CoTi 单晶的塑性流动”哲学杂志 A. 61. 785-880 (1990)

T.Takasugi: "Anomalous Temperature Dependence of the Yield Strength in IVaーVIII Intermatallic Compounds with B2 Structure" Journal of Materials Science. 26. (1991)

T.Takasugi：“具有 B2 结构的 IVa-VIII 金属间化合物的屈服强度的异常温度依赖性”材料科学杂志 26。（1991）

T.Takasugi: "Strength anomaly in IVa-VIII B2-type Intermetallics" Proc.of Inter.Symp.on Intermetallic Compounds-Structure and Mechanical Properties-. 615-620 (1991)

T.Takasugi：“IVa-VIII B2 型金属间化合物中的强度异常”Proc.of Inter.Symp.on 金属间化合物 - 结构和机械性能 -。

T. Takasugi, M. Yoshida and O. Izumi: "Anomalous Temperature Dependence of the Yield Strength in IVa-VIII Intermetallic Compounds with B2 Structure" Journal Materials Science. 26. 2941-2948 (1991)

T. Takasugi、M. Yoshida 和 O. Izumi：“具有 B2 结构的 IVa-VIII 金属间化合物中屈服强度的异常温度依赖性”材料科学杂志。