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金属学报  1996, Vol. 32 Issue (5): 510-515    
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高纯铝单晶在拉压疲劳早期过程中的行为
刘国东;朱震刚;王静
中国科学院固体物理研究所
BEHAVIOUR OF AI-SINGLE CRYSTAL DURING EARLY STAGE OF PUSH-PULL FATIGUE
LIU Guodong; ZHU Zhengang; WANG Jing (Institute of Solid State Physics; ChineseAcademy of Sciences; Hefei 230031)(Manuscript received 1995-08-22; in revised form 1995-12-14)
引用本文:

刘国东;朱震刚;王静. 高纯铝单晶在拉压疲劳早期过程中的行为[J]. 金属学报, 1996, 32(5): 510-515.
, , . BEHAVIOUR OF AI-SINGLE CRYSTAL DURING EARLY STAGE OF PUSH-PULL FATIGUE[J]. Acta Metall Sin, 1996, 32(5): 510-515.

全文: PDF(484 KB)  
摘要: 系统地研究了[110]与[100]两种特殊晶轴取向的高纯铝单晶在1×10(-4)-6×10(-4)室温拉压疲劳应变振幅条件下的应力σm、内耗Q(-1)和加载最大处超声衰减△αt,的循环响应行为,对疲劳不同阶段的位错组态作了详细的TEM观察。结果表明:两种单晶的循环应力均显示出“硬化-软化-二次硬化”的三个阶段特征。内耗的变化和应力进程同步,但趋势相反.超声衰减开始随圈数增大,达到一极大值后减小。这三种参数的变化是由位错与位错的相互作用机制控制。
关键词 铝单晶拉压疲劳超声衰减位错组态    
Abstract:Push-pull fatigue deformation of [110] and [100] Al-single crystals was performed at room temperature at strain amplitudes in the range (1 to 6) × 10~(-4). Variation of the stress σ, internal friction Q~(-1), and ultrasonic attenuation △α vs cycle number N under various strain amplitudes were measured systematically, and the relative dislocation configuration at different stages of fatigue was observed by TEM. The results indicate that the σ-N curve goes through a hardening -softening-secondary hardening sequence during push-pull fatigue in the two kinds of Al-single crystals. The change in the internal friction vs cycle N is synchronous and reverse with that of the stress. The ultrasonic attenuation △α increases with N at the beginning, after reaching a hump, decreases gradually. The variation of this three parameter is controled by the mechanism of interaction between dislocation segments.
Key words Al-single crystal    push-pull fatigue    ultrasonic attenuation    dislocation configuration
收稿日期: 1996-05-18     
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