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Observation of lattice defects, deformation behavior in duplex alloys and evaluation of their lifetime using magnetic properties.

观察双相合金中的晶格缺陷、变形行为并利用磁性能评估其寿命。

基本信息

批准号：
14205105
负责人：
UMAKOSHI Yukichi
金额：
$ 35.03万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Numerous dislocations and planar faults in metallic materials are introduced during fatigue deformation. Stress concentration near high density of lattice defects initiates a microcrack and finally fracture occurs. To understand the deformation mechanism and evaluate the reliability observation of lattice defects such as dislocations is necessary.. In general, the observation of lattice defects is performed using electron microscope. However, it is very difficult to obtain exact information about nature of dislocations due to high residual stress near the dislocations. It is known that magnetic properties are very sensitive to lattice defects in ferromagnetic materials. The lattice defects have been observed by magnetic technique. In this work, deformation behavior of FeAl, Fe_3Al and Ni_3(Al,Ti) containing small γ precipitates single crystals were prepared and their fatigue behavior was examined by magnetic technique. High-field susceptibility and spontaneous magnetization in FeAl and Fe_3Al were influenced by deformation. Type of dislocation and planar faults were determined by anisotropy of high field susceptibility. Lifetime of FeAl can be estimated by monitoring spontaneous magnetization because the spontaneos magnetization rapidly increases just before fracture during fatigue.

金属材料在疲劳变形过程中会产生大量的位错和平面断层。高密度晶格缺陷附近的应力集中会引发微裂纹，最终发生断裂。为了了解变形机制和评估晶格缺陷的可靠性，有必要对位错等晶格缺陷进行观察。通常，晶格缺陷的观察是用电子显微镜进行的。然而，由于位错附近的高残余应力，很难获得有关位错性质的准确信息。众所周知，铁磁材料的磁性对晶格缺陷非常敏感。用磁性技术观察到了晶格缺陷。本工作制备了FeAl、Fe3Al和Ni3(Al，Ti)含少量γ析出物的单晶，并用磁学技术研究了它们的疲劳行为。FeAl和Fe3Al的高场磁化率和自发磁化强度受形变的影响。高磁化率的各向异性决定了位错和平面断层的类型。FeAl的寿命可以通过监测自发磁化强度来估算，因为在疲劳过程中，自发磁化强度在断裂前迅速增加。

项目成果

期刊论文数量（37）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Formation of defomation bonds and precipitation of Ni_3Al(γ') phase in NiAl(β)-based single unygtol by theimoned and calproces"Intermetallics. 10. 139-147 (2002)

T.Sakata、H.Y.Yasuda、Y.Umakoshi：“Theimone 和 calproces 在 NiAl(β) 基单一 Unygtol 中形成变形键和 Ni_3Al(γ) 相的沉淀”金属间化合物。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

H.Y.Yasuda, R.Jimba, Y.Umakoshi: "Quantitative analysis of anti-phase bocendany tubes in cyclically deformed Fe-40at% Hognesue of magnetic properties"Scripta Materialia. 48. 589-592 (2003)

H.Y.Yasuda,%20R.Jimba,%20Y.Umakoshi:%20"定量%20analysis%20of%20反相%20bocendany%20tubes%20in%20周期性%20变形%20Fe-40at%%20Hognesue%20of%20Magnetic%20properties"Scripta