INVESTIGATION INTO CREEP BEHAVIOR IN POLYCRYSTALS OF TITANIUM ALUMINIDE INTERMETALLIC COMPOUNDS

钛铝化物多晶蠕变行为的研究

• 批准号: 63550522
• 负责人: TAKAHASHI Tohru
• 金额: $ 1.22万
• 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: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550522/
• 关键词: Titanium; Aluminum; Intermetallic compounds; Polycrystals; Creep; Chemical composition dependence; Grain size dependence; Stress dependence; クリープ

Creep behaviors have been investigated on single-phase polycrystalline intermetallics of Ti-50mol%Al, Ti-51.5mol%Al and Ti-53.4mol%Al under compressive stresses of 100-398MPa at 1000-1200K. Creep characteristics and their dependence upon temperatures, stresses, grain sizes and chemical compositions are summarized as follows.1. Creep curves in titanium aluminide polycrystalline intermetallics are generally composed of four stages: an instantaneous plastic strain, a primary transient of the normal type, a region representing the minimum creep rate, and a stage in which the creep rate increases gradually. General feature of the creep curve is not influenced by deformation conditions in Ti-50mol%Al. On the other hand, in Ti-51.5mol%Al and in Ti-53.4mol%Al materials the shape of creep curves are sensitive to stresses.2. Minimum creep rate is sensitive to chemical compositions, and it becomes greater as the composition is enriched in aluminum. Stress level to yield a certain value of minimum creep rate is about 20-30% higher in Ti-50mol%Al than in Ti-53.4mol%Al.3. Grain size dependence of minimum creep rates varies with chemical composition. Negative grain-size dependence is observed in Ti-50mol%Al polycrystals, and its degree becomes greater as the stress is lowered. On the other hand, grain sizes make insignificant effect on the creep rates in TI-53.4mol%Al.

研究了Ti-50mol%Al、Ti-51.5mol%Al和Ti-53.4mol%Al单相多晶金属间化合物在100-398MPa、1000-1200K压应力作用下的蠕变行为。蠕变特性及其对温度、应力、晶粒尺寸和化学成分的依赖性总结如下：钛铝多晶金属间化合物的蠕变曲线一般由四个阶段组成：瞬时塑性应变阶段、正常型初级瞬态阶段、代表最小蠕变速率的区域和蠕变速率逐渐增大的阶段。在Ti-50mol%Al中，变形条件不影响蠕变曲线的一般特征。另一方面，在Ti-51.5mol%Al和Ti-53.4mol%Al材料中，蠕变曲线的形状对应力敏感。最小蠕变速率对化学成分敏感，随着成分中铝含量的增加，最小蠕变速率增大。在Ti-50mol%Al中产生最小蠕变速率的应力水平比在Ti-53.4mol%Al中高20-30%。最小蠕变速率的晶粒大小随化学成分的不同而变化。Ti-50mol%Al多晶晶粒尺寸呈负相关，且随应力的降低晶粒尺寸负相关程度增大。另一方面，晶粒尺寸对TI-53.4mol%Al中蠕变速率的影响不大。

项目成果

高橋徹,永井走,及川洪: "金属間化合物TiAl鋳造材のクリ-プ挙動" 日本金属学会誌、第53巻、第4号. 53. 471-476 (1989)

Toru Takahashi、Masashi Nagai、Hiroshi Oikawa：“金属间 TiAl 铸造材料的蠕变行为”日本金属学会学报，第 53 卷，第 4. 53. 471-476 (1989)

TOHRU TAKAHASHI,HASHIRU NAGAI,HIROSHI OIKAWA: "Creep Behaviour of Polycrystalline Intermetallic Ti-53.4mol.%Al" Materials Science and Engineering. Vol.A114. 13-20 (1989)

TOHRU%20TAKAHASHI、HASHIRU%20NAGAI、HIROSHI%20OIKAWA:%20"蠕变%20行为%20of%20多晶%20金属间化合物%20Ti-53.4mol.%Al"%20材料%20科学%20和%20工程.%20Vol.A114.%2013-

Yasuo Tomioka,Tohru Takahashi,Hiroshi Oikawa: "Significance of Hardness in the Evaluation of High-Thmperature Properties of TiAl Intermetallics" Materials Transactions,JIM,Vol.30,No6. Vol.30. 451-454 (1989)

Yasuo Tomioka，Tohru Takahashi，Hiroshi Oikawa：“硬度在 TiAl 金属间化合物高温性能评估中的意义”Materials Transactions，JIM，Vol.30，No6。

TOHRU TAKAHASHI, HASHIRU NAGAI and HIROSHI OIKAWA: "Creep Behavior of Polycrystalline Intermetallic Ti-53.4mol.%Al" Mater. Sci. Eng., Vol.A114, pp. 13-20, 1989.

TOHRU%20TAKAHASHI,%20HASHIRU%20NAGAI%20和%20HIROSHI%20OIKAWA:%20"蠕变%20行为%20of%20多晶%20金属间化合物%20Ti-53.4mol.%Al"%20Mater.%20Sci.%20Eng.,%20Vol.A114

HASHIRU NAGAI,TOHRU TAKAHASHI,HIROSHI OIKAWA: "Effect of grain size on creep of Ti-53.4mol%Al intermetallics at 1100K" Journal of Materials Science. Vol.25. 629-632 (1990)

HASHIRU%20NAGAI、TOHRU%20TAKAHASHI、HIROSHI%20OIKAWA:%20"Effect%20of%20grain%20size%20on%20creep%20of%20Ti-53.4mol%Al%20intermetalics%20at%201100K"%20Journal%20of%20Materials%20Science