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金属学报(英文版) 1992
EFFECT OF SLIP ORIENTATION ON STRESS RESPONSE,INTERNAL FRICTION AND ULTRASONIC ATTENUATION DURING CYCLIC DEFORMATION IN Al SINGLE CRYSTALSKeywords: crystal orientation,cyclic deformation,stress response,internal friction,ultrasonic attenuation,Al Abstract: The variation of cyclic stress,internal friction and ultrasonic attenuation during cyclicdeformation and relations among them have been investigated with different slip orientationAl single crystals.The results indicate that the value of cyclic stress σ,internal frictionQ~(-1)and ultrasonic attenuation △α depend obviously on the slip orientation.There are largedifferences in above three parameters for different slip orientation Al crystals.In early stageof 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.
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