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激光熔化沉積Ti-6Al-2Zr-Mo-V合金
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國(guó)家自然科學(xué)基金(50625413);“973”計(jì)劃(2006CB 605206-2)資助


Deformation Behavior in High-Frequency Fatigue Failure of Laser Melting Deposited
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    摘要:

    研究激光熔化沉積Ti-6Al-2Zr-Mo-V合金在高周疲勞失效中的變形行為,并提出相應(yīng)的變形機(jī)制。結(jié)果表明,激光沉積鈦合金疲勞裂紋萌生和擴(kuò)展中的變形行為都與其位錯(cuò)運(yùn)動(dòng)和滑移行為密切相關(guān)。疲勞裂紋擴(kuò)展中的滑移主要沿兩個(gè)滑移面進(jìn)行;裂紋擴(kuò)展亞表面存在大量二次裂紋。解釋兩種不同類(lèi)型二次裂紋的形成機(jī)制和作用。分析粗大柱狀晶晶界變形特征

    Abstract:

    Deformation behavior in high-frequency fatigue failure of laser melting deposited Ti-6Al-2Zr-Mo-V alloys was investigated. The deformation modes and mechanisms were also discussed. The results indicate that the deformation behavior during fatigue crack nucleation and propagation are closely related to the dislocation motion and slip behavior. The fatigue cracks by slip deformation propagate along two slip planes. A lot of secondary cracks were observed on the crack propagation subsurface. Formation mechanism and effect of two types of secondary cracks were explained. Grain boundary deformation of coarse-columnar crystal was also discussed.

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賀瑞軍,王華明.激光熔化沉積Ti-6Al-2Zr-Mo-V合金[J].稀有金屬材料與工程,2010,39(2):288~291.[He Ruijun, Wang Huaming. Deformation Behavior in High-Frequency Fatigue Failure of Laser Melting Deposited[J]. Rare Metal Materials and Engineering,2010,39(2):288~291.]
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  • 收稿日期:2009-05-21
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