夏月波
,
张天宜
,
费广涛
,
周星
金属学报
本文报道了不同取向Al单晶体在循环形变过程中的应力响应、内耗和超声衰减的变化及它们之间的关系,试验结果表明,循环应力σ、内耗Q~(-1)和超声衰减△α对晶体取向有明显的依赖性,单滑移取向和多滑移取向晶体之间,上述三量的差别很大,对同一取向晶体,σ增加对应着Q~(-1)减少和Δa增加,但Δa达到最大值需要的循环周次少于σ达到最大值所需的循环数,而Q~(-1)与σ则基本上同时达到最低值和最大值。
关键词:
晶体取向
,
cyclic deformation
,
stress response
,
internal friction
,
ultrasonic attenuation
XIA Yuebo ZHANG Tianyi State Key Laboratory for Fracture and Failure of Materials.Institute of Metal Research
,
Academia Sinica.Shenyang.China DENG Jun Shenyang Polytechnical University.China Associate Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The symmetrical push-pull fatigue tests at strain amplitude of 2×10~3 with different slip orientation of Al single crystals,were carried out at room temperature in air.The peak stresses of various cycles were measured and the stress-strain hysteresis loops for selected cy- cles were recorded.The energy losses.friction stresses,back stresses and shape
关键词:
crystal orientation
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XIA Yuebo ZHANG Tianyi State Key Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaFEI Guangtao ZHOU Xing Laboratory of Internal Friction and Defects in Solids
,
Institute of Solid State Physics
,
Academia Sinica
,
Hefei
,
China Associate Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The variation of cyclic stress,internal friction and ultrasonic attenuation during cyclic deformation and relations among them have been investigated with different slip orientation Al single crystals.The results indicate that the value of cyclic stress σ,internal friction Q~(-1)and ultrasonic attenuation △α depend obviously on the slip orientation.There are large differences in above three parameters for different slip orientation Al crystals.In early stage of fatigue life,σ and △α increase and Q~(-1)decreases with cycles N,and △α reached maxi- mum before σ,while Q~(-1)and σ get the valley and the peak,respectively,at same cycles.
关键词:
crystal orientation
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null
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null
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