Precipitation Mechanisms of Ordered Phases in Ti-and Ni-base Alloys

钛基和镍基合金中有序相的析出机理

• 批准号: 07650771
• 负责人: NAKAI Kiyomichi
• 金额: $ 1.15万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650771/
• 关键词: Superlattice; Intermetallics; Superalloy; Phase decomposition; Lattice defect; Solute atom; Age-haedening; SADT; 相分解過程; マッシブ組織; 結晶方位関係; 析出前段階; 相安定性; 相分離

The mechanisms for decomposition processes of alpha-and beta-phases in Ti-Al base intermetallics have been analyzed in terms of crystallography.1.the beta-phase stabilizes with increasing Zr and decomposes into Widmanstatten structure of alpha_2-phase by the Shear-Assisted Diffusional Transformation mechanism (SADT).2.In 30-50at.%Al, (alpha_2+gamma) lamellar structure uncleates at the grainboundary gamma-allotriomorph by the SADT with the Blackburn orientation relationship.3.Maasive structure, which consists of both alpha_2 and gamma, forms with the orientation relationships, {111}_<gamma>//{1011}_<alpha> and <110>_<gamma>//<1210>_<alpha>, in * 45at.%Al.In Ni-base superalloy, the preprecipitation stages of ordered phases, which control the age-hardening, have been analyzed in terms of the interaction of solute atoms with lattice defects.1.Quenched-in excess vacancies alter the nature of dislocations and enhance the trapping of solute atoms at the dislocations.2.The trapping of solute atoms at the dislocations delays the ordered-phase precipitation as well as age-hardening, remarkably.

本文从结晶学的角度分析了Ti-Al基金属间化合物中α相和β相的分解机制：1.β相随Zr含量的增加而稳定，并通过剪切辅助扩散转变机制分解为α_2相的魏氏组织；2.在30-50at.%Al中，(α_2+γ)层片状结构在晶界处解理，具有Blackburn取向关系；3.由α_2和伽马组成的马相组织，具有{111}_lt；//{1011}_&lt；Alpha&>和&lt；110&gt；_&lt；gamma&gt；//&lt；1210&gt；_&lt；alpha&gt；根据溶质原子与晶格缺陷的相互作用，分析了镍基高温合金中控制时效硬化的有序相的预析出阶段：1.过量空位的猝灭改变了位错的性质，增强了位错处溶质原子的俘获。2.位错处的溶质原子捕获显著地延缓了有序相的析出和时效硬化。

项目成果

大森靖也: "Effects of small amounts of B,Nb and Ti additions on nucleation and growth processes of intermediate transformation products in low carbon 3% Mn steels" ISIJ International. 35. 1001-1005 (1995)

Yasunari Omori：“少量 B、Nb 和 Ti 添加对低碳 3% Mn 钢中中间相变产物的成核和生长过程的影响”ISIJ International，35. 1001-1005 (1995)。

仲井清眞: "Effects of lattice defect behaviors on preprecipitation stages of γ' and γ" phases in a Ni-base superalloy" ISIJ International. 36. 187-193 (1996)

Kiyomasa Nakai：“晶格缺陷行为对镍​​基高温合金中 γ 和 γ” 相预沉淀阶段的影响” ISIJ International. 36. 187-193 (1996)

K.NAKAI,Y.OHARA,H.OHTSUBO and Y.OHMORI: "Effects of lattice defect behaviors on preprecipitation stage of gamma'and gamma"phases in a Ni-base superalloy" ISIJ Intern. 36. 187-193 (1996)

K.NAKAI、Y.OHARA、H.OHTSUBO 和 Y.OHMORI：“晶格缺陷行为对镍​​基高温合金中 γ 和 γ”相预沉淀阶段的影响” ISIJ Intern. 36. 187-193 (1996)

仲井清眞: "Formation process of lamellar γ phase in a Ti-40.at%Al alloy" Mater.Trans.JIM. 37. 813-820 (1996)

Kiyomasa Nakai：“Ti-40.at%Al 合金中层状 γ 相的形成过程”Mater.Trans.JIM 37. 813-820 (1996)

大森靖也: "Crystallographic analysis of upper bainite in Fe-9%Ni-C alloys" Mater.Trans.JIM. 37. 1665-1671 (1996)

Yasunari Omori：“Fe-9%Ni-C 合金中上贝氏体的晶体分析”Mater.Trans.JIM 37. 1665-1671 (1996)