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Alloy Design of Ultra High-Tempreature and Ultra Environmental Resisitance insitu Cr_2X-Based Intermetallic Compound Composites

超高温、超耐环境原位Cr_2X基金属间化合物复合材料的合金设计

基本信息

批准号：
11555173
负责人：
TAKASUGI Takayuki
金额：
$ 8.83万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555173/
关键词：
Cr-base alloy Laves alloy Alloy design High-temperature strength Composite materials Microstructure

项目摘要

To develop Cr_2X (X : Nb, Zr, Hf, Ta and Ti)-based Intermetallic compound composites that have low-temperature fracture toughness and ultra high-temperature strength, and also are highly resistive to environment, the studies were performed. The following results were obtained.1) Cr-Nb-W and Cr-Nb-Ti ternary alloy phase diagrams were constructed. The phase fields of Cr_2Nb Laves phase were determined. Also, it was determined that V substitutes for Cr sites while Mo, W and Ti substitute for Nb sites.2) Microstructure and phase diagram of Cr-Zr binary alloy were investigated. Defect structures in Cr_2Zr were determined and discussed in association with atomic size concept. Also, the low-temperature fracture toughness, high-temperature compressive strength and oxidation behavior were investigated, discussed in relation to microstructure and defect structures, and also compared with those in other Laves alloys.3) Deformation microstores of Cr_2Nb and V-added Cr_2Nb were investigated by TEM. It was shown that those alloys were deformable above 1300 K and deformation is not due to mechanical twinning but to glide/climb motion of dislocations.4) Microstructure, low-temperature fracture toughness, high-temperature compressive strength and oxidation behavior of Cr_2Zr and Cr_2Nb alloys fabricated by powder metallurgy were investigated, and shown to be superior to those fabricated by ingot metallurgy.5) Microstructure, phase diagram and low-temperature fracture toughness of Cr_2Zr-Cr_2Nb and Cr_2Zr-Cr_2Hf pseud binary alloys were investigated. The low-temperature fracture toughness was much improved at specific alloy compositions.

为了开发具有低温断裂韧性和超高温强度，同时又具有高耐环境性能的Cr_2X（X：Nb，Zr，Hf，Ta，Ti）基金属间化合物复合材料，开展了本课题的研究。获得了以下结果：1）绘制了Cr-Nb-W和Cr-Nb-Ti三元合金相图。测定了Cr_2NbLaves相的相场。研究了Cr-Zr二元合金的显微组织和相图。确定了Cr_2Zr中的缺陷结构，并结合原子尺寸概念进行了讨论。研究了Cr_2Nb合金的低温断裂韧性、高温抗压强度和高温氧化行为，并与其它Laves合金进行了比较。3）用透射电镜研究了Cr_2Nb和加V的Cr_2Nb合金的形变微区。结果表明，在1300 K以上，合金都能发生形变，形变不是由于机械孪晶，而是由于位错的滑移/攀移运动。4）研究了粉末冶金法制备的Cr_2Zr和Cr_2Nb合金的显微组织、低温断裂韧性、高温抗压强度和氧化性能，结果表明，粉末冶金法制备的Cr_2Zr和Cr_2Nb合金的显微组织、低温断裂韧性、高温抗压强度和氧化性能均上级铸锭法制备的Cr_2Zr和Cr_2Nb合金。研究了Cr_2 Zr-Cr_2Nb和Cr_2 Zr-Cr_2 Hf伪二元合金的相图和低温断裂韧性。在特定的合金成分下，低温断裂韧性得到了很大的提高。