DEVELOPMENT STUDY OF HIGH-TEMPERATURE STRUCTURAL MATERIALS OF LAVES PHASE REFRACTORY ALLOYS WITH HIGH RESISTANCE TO CORROSION AND ENVIRONMENT

高耐腐蚀耐环境Laves相耐火合金高温结构材料的开发研究

• 批准号: 10650696
• 负责人: YOSHIDA Mitsuhiko
• 金额: $ 2.3万
• 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 Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650696/
• 关键词: intermeallic compound; high-temperature; Laves phase; phase boundary; duplex phase; eutectic path; 高温材料; NbCr_2; TiCr_2; 二相組織

The phase diagram of ternary Nb-Cr-Ti alloy systema at 1350℃ are investigated by mettallography, X-ray diffraction and transmission electron microscopy equipped with energy-dispersive X-ray analysis. And also, high temperature deformability is investigated by compression test. In the composition between 5at.%Nb and 15at.%Nb in the alloy with 66.7at.%Cr-(33.3-x)at.%Ti-x at.%Nb, C36 Laves phase with dihexagonal structure is in equilibrium to C15 phase with fcc structure at a temperature of 1350℃. And Laves phase are equilibrated directly with Cr-bcc solid solution without forming any intermetallic phases. The eutectic path consisting of Laves phase and Cr-bcc solid solution lies in a composition between 75at.%Cr and 80at.%Cr in the ternary Nb-Cr-Ti alloy system. Form the experimental result of compression test, the high-temperature deformability of the alloy consisting of primary Cr-bcc solid solution and Laves phase is better than that of the alloy consisting of primary Laves phase and Cr-bcc solid solution.

本文用金相、X射线衍射和透射电镜结合能谱分析研究了Nb-Cr-Ti三元合金系在1350℃时的相图。并通过压缩试验研究了其高温变形性能。在5at.% Nb和15 at.% Nb含量为66.7at.% Cr-（33.3-x）原子% Ti-x at.%在1350℃时，具有二六方结构的Nb，C36 Laves相与具有面心立方结构的C15相处于平衡状态。和Laves相直接与Cr-bcc固溶体相平衡，没有形成任何金属间化合物相。由Laves相和Cr-bcc固溶体组成的共晶路径位于75 at.% Cr和80 at.% Nb-Cr-Ti三元合金系中的Cr。从压缩试验结果来看，由Cr-bcc固溶体和Laves相组成的合金的高温变形性能优于由Cr-bcc固溶体和Laves相组成的合金。

项目成果

M.Yoshida,T.Takagugi: "Phase relation and microstructure of the Nb-Cr-Walloy system" Materials Science and Engimeeving. (to be publisheo). (1998)

M.Yoshida，T.Takagugi：“Nb-Cr-Walloy 体系的相关系和微观结构”材料科学与工程。

M. Yoshida, T. Takasugi: "Phase relation and microstructure of the Nb-Cr-W alloy System"Materials science and Engineering. A262. 107-114 (1999)

M. Yoshida，T. Takasugi：“Nb-Cr-W合金系的相关系和微观结构”材料科学与工程。

M. Yoshida and T. Takasugi: "Phase relation and Microstructure of the Nb-Cr-W alloy system"Mater. Sa. Eng.,. A262. 107-114 (1999)

M. Yoshida 和 T. Takasugi：“Nb-Cr-W 合金系的相关系和微观结构”Mater。

H. Okamiwa, D. Shindo, M. Yoshida, T. Takasugi: "Determination of site occupancy of additives XCX=V, Mo W and Ti>in the Nb-Cr-X Laves Phaseby ALCHEMI"Acta Materialia. 47. 1987-1992 (1999)

H. Okamiwa、D. Shindo、M. Yoshida、T. Takasugi：“通过 ALCHEMI 测定 Nb-Cr-X Laves 相中添加剂 XCX=V、Mo W 和 Ti> 的位点占用”Acta Materialia。

M.Yoshida and T.Takasugi: "Phase relation and microstructure of the Nb-Cr-W alloy system"Mater. Sci. Eng.. Vol.A262. 107-114 (1999)

M.Yoshida 和 T.Takasugi：“Nb-Cr-W 合金系的相关系和微观结构”Mater。