DEVELOPMENT OF B2-TYPE INTERMETALLIC COMPOUND ALLOYS WITH ANOMALOUS TEMPERATURE DEPENDENCE OF STRENGTH FOR RESISTANCE TO CREEP.

抗蠕变强度依赖于异常温度的B2型金属间化合物合金的研制。

• 批准号: 04555174
• 负责人: YOSHIDA Mitsuhiko
• 金额: $ 1.22万
• 依托单位: Miyagi National College of Technology.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555174/
• 关键词: dislocation; intermetallic compound; yield strength anomaly; CoTi; CoHf; CoZr; dissociation; CoHf; 金属間化合物; 転位

The Burgers vector and the morphological feature of the dislocation in B2-type CoTi single crystals were investigated by means of high-resolution transmission electron microscopy. The following results were obtained.At intermediate temperature, the screw component of the dislocations with <001> type Burgers vector was dominant and dissociated with unstable stacking fault on (010) plain. this dissociation of screw dislocation may affect the mechanical properties of B2-type intermetallic compound CoTi.And also, the mechanical behaviors, the Burgers vectors, the activated slip plains and the morphological feature of dislocation in B2-type CoZr and CoHf polycrystals were investigated by means of compression test machine and transmission electron microscopy at a wide range of temperatures.In both CoZr and CoHf, it was observed the yield strength anomaly at intermediate temperatures, and Burgers vectors were the <001> type and associated slip plain were {110} as similar to that of CoTi single crystals.

利用高分辨率透射电镜研究了b2型CoTi单晶中的Burgers矢量和位错的形态特征。得到了以下结果：在中等温度下，<001>型Burgers向量位错的螺旋分量占主导地位，并在（010）平原上与不稳定层错分离。螺位错的解离会影响b2型金属间化合物CoTi的力学性能。利用压缩试验机和透射电镜研究了b2型CoZr和CoHf多晶在不同温度下的力学行为、Burgers矢量、活化滑动平原和位错形态特征。CoZr和CoHf均存在中温屈服强度异常，Burgers向量为<001>型，滑移平原为{110}，与CoTi单晶相似。

项目成果

M.Yoshida T.Takagugi: "Trangmission electron microscopy study of the acti vated slip systems and dislocation gtructuras in B2-type CoZr and CoHf polycrystals." Philos Mag. 68. 401-4117 (1993)

M.Yoshida T.Takagugi：“B2 型 CoZr 和 CoHf 多晶中激活滑移系统和位错结构的透射电子显微镜研究。”