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Ti6Al4V合金超聲深滾層的組織結(jié)構(gòu)特征
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北京市自然科學(xué)基金(3093027)


Microstructure Characteristics of Ultrasound-Aided Deep Rolling Treated Ti6Al4V Alloy
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    摘要:

    采用超聲深滾技術(shù)對Ti6Al4V合金進行表面機械強化處理，使用掃描電鏡、硬度分析、X射線衍射和透射電鏡等分析手段研究超聲深滾處理Ti6Al4V合金表面層的組織結(jié)構(gòu)特征。結(jié)果表明：超聲深滾處理后，材料表層組織嚴(yán)重細(xì)化，形成了納米結(jié)構(gòu)層，表面晶粒尺寸小于20 nm。晶粒細(xì)化層的深度約為0.15 mm，在0.15 mm深度處，雖然晶界結(jié)構(gòu)保持完整但晶粒內(nèi)部位錯密度增加。分析了組織結(jié)構(gòu)細(xì)化對于改善疲勞性能的意義

    Abstract:

    Ti6Al4V alloy was treated by ultrasound-aided deep rolling (UADR) for surface mechanical strengthening. The microstructure evolution of the UADR treated specimen was characterized by scanning electron microscopy (SEM), hardness test, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that obvious grain refinement is found after UADR treatment and a nano-structured surface layer is formed with an average grain size less than 20 nm in the immediate surface. Grain boundaries at about 150 μm away from the surface become distinguishable. In this area, although grain boundary structure keeps unchanged, there is an increase of dislocation density in those grains. The effect of grain refinement on fatigue performance was also discussed

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李 禮,朱有利. Ti6Al4V合金超聲深滾層的組織結(jié)構(gòu)特征[J].稀有金屬材料與工程,2010,39(10):1754~1758.[Li Li, Zhu Youli. Microstructure Characteristics of Ultrasound-Aided Deep Rolling Treated Ti6Al4V Alloy[J]. Rare Metal Materials and Engineering,2010,39(10):1754~1758.]
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  • 收稿日期:2009-10-15
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